Patent Grant
11136513
There are two basic marine fuel types: distillate based marine fuel, also known as Marine Gas Oil (MGO) or Marine Diesel Oil (MDO); and residual based marine fuel, also known as heavy marine fuel oil (HMFO). Distillate based marine fuel both MGO and MDO, comprises petroleum middle distillate fractions separated from crude oil in a refinery via a distillation process. Gasoil (also known as medium diesel) is a petroleum middle distillate in boiling range and viscosity between kerosene (light distillate) and lubricating oil (heavy distillate) containing a mixture of C10 to C19 hydrocarbons. Gasoil (a heavy distillate) is used to heat homes and is used blending with lighter middle distillates as a fuel for heavy equipment such as cranes, bulldozers, generators, bobcats, tractors and combine harvesters. Generally maximizing middle distillate recovery from heavy distillates mixed with petroleum residues is the most economic use of these materials by refiners because they can crack gas oils into valuable gasoline and distillates in a fluid catalytic cracking (FCC) unit. Diesel oils for road use are very similar to gas oils with road use diesel containing predominantly contain a middle distillate mixture of C10 through C19 hydrocarbons, which include approximately 64% aliphatic hydrocarbons, 1-2% olefinic hydrocarbons, and 35% aromatic hydrocarbons. Distillate based marine fuels (MDO and MGO) are essentially road diesel or gas oil fractions blended with up to 15% residual process streams, and optionally up to 5% volume of polycyclic aromatic hydrocarbons (asphaltenes). The residual and asphaltene materials are blended into the middle distillate to form MDO and MGO as a way to both swell volume and productively use these low value materials.
Asphaltenes are large and complex polycyclic hydrocarbons with a propensity to form complex and waxy precipitates, especially in the presence of aliphatic (paraffinic) hydrocarbons that are the primary component of Marine Diesel. Once asphaltenes have precipitated out, they are notoriously difficult to re-dissolve and are described as fuel tank sludge in the marine shipping industry and marine bunker fueling industry. One of skill in the art will appreciate that mixing Marine Diesel with asphaltenes and process residues is limited by the compatibility of the materials and formation of asphaltene precipitates and the minimum Cetane number required for such fuels.
Residual based fuels or Heavy Marine Fuel Oil (HMFO) are used by large ocean-going ships as fuel for large two stroke diesel engines for over 50 years. HMFO is a blend of the residues generated throughout the crude oil refinery process. Typical refinery streams combined to from HMFO may include, but are not limited to: atmospheric tower bottoms (i.e. atmospheric residues), vacuum tower bottoms (i.e. vacuum residues) visbreaker residue, FCC Light Cycle Oil (LCO), FCC Heavy Cycle Oil (HCO) also known as FCC bottoms, FCC Slurry Oil, heavy gas oils and delayed cracker oil (DCO), deasphalted oils (DAO); heavy aromatic residues and mixtures of polycylic aromatic hydrocarbons, reclaimed land transport motor oils; pyrolysis oils and tars; aspahltene solids and tars; and minor portions (often less than 20% vol.) of middle distillate materials such as cutter oil, kerosene or diesel to achieve a desired viscosity. HMFO has a higher aromatic content (especially polynuclear aromatics and asphaltenes) than the marine distillate fuels noted above. The HMFO component mixture varies widely depending upon the crude slate (i.e. source of crude oil) processed by a refinery and the processes utilized within that refinery to extract the most value out of a barrel of crude oil. The HMFO is generally characterized as being highly viscous, high in sulfur and metal content (up to 5 wt %), and high in asphaltenes making HMFO the one product of the refining process that has historically had a per barrel value less than feedstock crude oil.
Industry statistics indicate that about 90% of the HMFO sold contains 3.5 weight % sulfur. With an estimated total worldwide consumption of HMFO of approximately 300 million tons per year, the annual production of sulfur dioxide by the shipping industry is estimated to be over 21 million tons per year. Emissions from HMFO burning in ships contribute significantly to both global marine air pollution and local marine air pollution levels.
The International Convention for the Prevention of Pollution from Ships, also known as the MARPOL convention or just MARPOL, as administered by the International Maritime Organization (IMO) was enacted to prevent marine pollution (i.e. marpol) from ships. In 1997, a new annex was added to the MARPOL convention; the Regulations for the Prevention of Air Pollution from Ships—Annex VI to minimize airborne emissions from ships (SOx, NOx, ODS, VOC) and their contribution to global air pollution. A revised Annex VI with tightened emissions limits was adopted in October 2008 and effective 1 Jul. 2010 (hereafter called Annex VI (revised) or simply Annex VI).
MARPOL Annex VI (revised) adopted in 2008 established a set of stringent air emissions limits for all vessel and designated Emission Control Areas (ECAs). The ECAs under MARPOL Annex VI are: i) Baltic Sea area—as defined in Annex I of MARPOL—SOx only; ii) North Sea area—as defined in Annex V of MARPOL—SOx only; iii) North American—as defined in Appendix VII of Annex VI of MARPOL—SOx, NOx and PM; and, iv) United States Caribbean Sea area—as defined in Appendix VII of Annex VI of MARPOL—SOx, NOx and PM.
Annex VI (revised) was codified in the United States by the Act to Prevent Pollution from Ships (APPS). Under the authority of APPS, the U.S. Environmental Protection Agency (the EPA), in consultation with the United States Coast Guard (USCG), promulgated regulations which incorporate by reference the full text of Annex VI. See 40 C.F.R. § 1043.100(a)(1). On Aug. 1, 2012 the maximum sulfur content of all marine fuel oils used onboard ships operating in US waters/ECA was reduced from 3.5% wt. to 1.00% wt. (10,000 ppm) and on Jan. 1, 2015 the maximum sulfur content of all marine fuel oils used in the North American ECA was lowered to 0.10% wt. (1,000 ppm). At the time of implementation, the United States government indicated that vessel operators must vigorously prepare to comply with the 0.10% wt. (1,000 ppm) US ECA marine fuel oil sulfur standard. To encourage compliance, the EPA and USCG refused to consider the cost of compliant low sulfur fuel oil to be a valid basis for claiming that compliant fuel oil was not available for purchase. For over five years there has been a very strong economic incentive to meet the marine industry demands for low sulfur HMFO, however technically viable solutions have not been realized and a premium price has been commanded by refiners to supply a low sulfur HMFO compliant with Annex VI sulfur emissions requirements in the ECA areas.
Since enactment in 2010, the global sulfur cap for HMFO outside of the ECA areas was set by Annex VI at 3.50% wt. effective 1 Jan. 2012; with a further reduction to 0.50% wt, effective 1 Jan. 2020. The global cap on sulfur content in HMFO has been the subject of much discussion in both the marine shipping and marine fuel bunkering industry. There has been and continues to be a very strong economic incentive to meet the international marine industry demands for low sulfur HMFO (i.e. HMFO with a sulfur content less than 0.50 wt. %. Notwithstanding this global demand, solutions for transforming high sulfur HMFO into low sulfur HMFO have not been realized or brought to market. There is an on-going and urgent demand for processes and methods for making a low sulfur HMFO compliant with MARPOL Annex VI emissions requirements.
Replacement of Heavy Marine Fuel Oil with Marine Gas Oil or Marine Diesel:
One primary solution to the demand for low sulfur HMFO to simply replace high sulfur HMFO with marine gas oil (MGO) or marine diesel (MDO). The first major difficulty is the constraint in global supply of middle distillate materials that make up 85-90% vol of MGO and MDO. It is reported that the effective spare capacity to produce MGO is less than 100 million metric tons per year resulting in an annual shortfall in marine fuel of over 200 million metric tons per year. Refiners not only lack the capacity to increase the production of MGO, but they have no economic motivation because higher value and higher margins can be obtained from using middle distillate fractions for low sulfur diesel fuel for land-based transportation systems (i.e. trucks, trains, mass transit systems, heavy construction equipment, etc.).
Blending:
Another primary solution is the blending of high sulfur HMFO with lower sulfur containing fuels such as MGO or MDO low sulfur marine diesel (0.1% wt. sulfur) to achieve a Product HMFO with a sulfur content of 0.5% wt. In a straight blending approach (based on linear blending) every 1 ton of high sulfur HSFO (3.5% sulfur) requires 7.5 tons of MGO or MDO material with 0.1% wt. S to achieve a sulfur level of 0.5% wt. HMFO. One of skill in the art of fuel blending will immediately understand that blending hurts key properties of the HMFO, specifically lubricity, fuel density, CCAI, viscosity, flash point and other important physical bulk properties. Blending a mostly paraffinic-type distillate fuel (MGO or MDO) with a HMFO having a high poly aromatic content often correlates with poor solubility of asphaltenes. A blended fuel is likely to result in the precipitation of asphaltenes and/or waxing out of highly paraffinic materials from the distillate material forming an intractable fuel tank sludge. Fuel tank sludge causes clogging of filters and separators, transfer pumps and lines, build-up of sludge in storage tanks, sticking of fuel injection pumps, and plugged fuel nozzles. Such a risk to the primary propulsion system is not acceptable for a ship in the open ocean.
It should further be noted that blending of HMFO with marine distillate products (MGO or MDO) is not economically viable. A blender will be taking a high value product (0.1% S marine gas oil (MGO) or marine diesel (MDO)) and blending it 7.5 to 1 with a low value high sulfur HMFO to create a final IMO/MARPOL compliant HMFO (i.e. 0.5% wt. S Low Sulfur Heavy Marine Fuel Oil—LSHMFO) which will sell at a discount to the value of the principle ingredient (i.e. MGO or MDO).
Processing of Residual Oils.
For the past several decades, the focus of refining industry research efforts related to the processing of heavy oils (crude oils, distressed oils, or residual oils) has been on upgrading the properties of these low value refinery process oils to create middle distillate and lighter oils with greater value. The challenge has been that crude oil, distressed oil and residues contain high levels of sulfur, nitrogen, phosphorous, metals (especially vanadium and nickel); asphaltenes and exhibit a propensity to form carbon or coke on the catalyst. The sulfur and nitrogen molecules are highly refractory and aromatically stable and difficult and expensive to crack or remove. Vanadium and nickel porphyrins and other metal organic compounds are responsible for catalyst contamination and corrosion problems in the refinery. The sulfur, nitrogen, and phosphorous, must be removed because they are well-known poisons for the precious metal (platinum and palladium) catalysts utilized in the processes downstream of the atmospheric or vacuum distillation towers.
The difficulties treating atmospheric or vacuum residual streams has been known for many years and has been the subject of considerable research and investigation. Numerous residue-oil conversion processes have been developed in which the goals are same: 1) create a more valuable, preferably middle distillate range hydrocarbons; and 2) concentrate the contaminates such as sulfur, nitrogen, phosphorous, metals and asphaltenes into a form (coke, heavy coker residue, FCC slurry oil) for removal from the refinery stream. Well known and accepted practice in the refining industry is to increase the reaction severity (elevated temperature and pressure) to produce hydrocarbon products that are lighter and more purified, increase catalyst life times and remove sulfur, nitrogen, phosphorous, metals and asphaltenes from the refinery stream.
In summary, since the announcement of the MARPOL Annex VI standards reducing the global levels of sulfur in HMFO, refiners of crude oil have had modest success in their technical efforts to create a process for the production of a low sulfur substitute for high sulfur HMFO. Despite the strong governmental and economic incentives and needs of the international marine shipping industry, refiners have little economic reason to address the removal of environmental contaminates from high sulfur HMFOs. The global refining industry has been focused upon generating greater value from each barrel of oil by creating middle distillate hydrocarbons (i.e. diesel) and concentrating the environmental contaminates into increasingly lower value streams (i.e. residues) and products (petroleum coke, HMFO). Shipping companies have focused on short term solutions, such as the installation of scrubbing units, or adopting the limited use of more expensive low sulfur marine diesel and marine gas oils as a substitute for HMFO. On the open seas, most if not all major shipping companies continue to utilize the most economically viable fuel, that is HMFO. There remains a long standing and unmet need for processes and devices that remove the environmental contaminants (i.e. sulfur, nitrogen, phosphorous, metals especially vanadium and nickel) from HMFO without altering the qualities and properties that make HMFO the most economic and practical means of powering ocean going vessels.
It is a general objective to reduce the environmental contaminates from Distressed Fuel Oil Materials (DFOM) in a multi stage device implementing a pre-treatment stage that transforms the DFOM into a Feedstock Heavy Marine Fuel Oil (Feedstock HMFO) and a Core Process that removes the environmental contaminants from the Feedstock HMFO, minimizes the changes in the desirable properties of the Feedstock HMFO and minimizes the production of by-product hydrocarbons (i.e. light hydrocarbons having C1-C4 and wild naphtha (C4-C20)).
A first aspect and illustrative embodiment encompasses a multi-stage device for the production of a Product Heavy Marine Fuel Oil from Distressed Fuel Oil Materials, the device comprising: means for pre-treating the Distressed Fuel Oil Materials into a Feedstock HMFO, said means for pre-treating being selected from the group consisting of a stripper column; a distillation column; a divided wall distillation column; a reactive distillation column; a counter-current extraction unit; a fixed bed absorption unit, a solids separation unit, a blending unit; and combinations thereof. The illustrative device further includes a means for mixing a quantity of Feedstock Heavy Marine Fuel Oil with a quantity of Activating Gas mixture to give a Feedstock Mixture; means for heating the Feedstock mixture, wherein the means for mixing and means for heating communicate with each other; a Reaction System in fluid communication with the means for heating, wherein the Reaction System comprises one or more reactor vessels selected from the group consisting of: dense packed fixed bed trickle reactor; dense packed fixed bed up-flow reactor; ebulliated bed three phase up-flow reactor; fixed bed divided wall reactor; fixed bed three phase bubble reactor; fixed bed liquid full reactor, fixed bed high flux reactor; fixed bed structured catalyst bed reactor; fixed bed reactive distillation reactor and combinations thereof, and wherein the one or more reactor vessels contains one or more reaction sections configured to promote the transformation of the Feedstock Mixture to a Process Mixture. Also included in the illustrative embodiment is means for receiving said Process Mixture and separating the liquid components of the Process Mixture from the bulk gaseous components of the Process Mixture, said means for receiving in fluid communication with the reaction System; and means for separating any residual gaseous components and by-product hydrocarbon components from the Process Mixture to form a Product Heavy Marine Fuel Oil. In a preferred embodiment, the Reaction System comprises two or more reactor vessel wherein the reactor vessels are configured in a matrix of at least 2 reactors by 2 reactors. Another alternative and preferred embodiment of the Reactor System comprises at least six reactor vessels wherein the reactor vessels are configured in a matrix of at least 3 reactors arranged in series to form two reactor trains and wherein the 2 reactor trains arranged in parallel and configured so Process Mixture can be distributed across the matrix. In an illustrative embodiment, the Pre-Treatment Unit is a divided wall distillation column, preferably comprising one or more structured beds, wherein the one or more structured beds comprises a plurality of catalyst retention structures, each catalyst retentions structure comprising at least two coplanar fluid permeable metal sheets, wherein at least one of the fluid permeable sheets is corrugated and wherein the two coplanar fluid permeable metal sheets define one or more catalyst rich spaces and one or more catalyst lean spaces, wherein within the catalyst rich space there is one or more catalyst materials and optionally inert packing materials and wherein the catalyst lean spaces optionally contain an inert packing material. In another illustrative embodiment, the Pre-Treatment Unit is a reactive distillation column, wherein the reactive distillation column comprises one or more structured beds, wherein the one or more structured beds comprises a plurality of catalyst retention structures, each catalyst retentions structure comprising at least two coplanar fluid permeable metal sheets, wherein at least one of the fluid permeable sheets is corrugated and wherein the two coplanar fluid permeable metal sheets define one or more catalyst rich spaces and one or more catalyst lean spaces, wherein within the catalyst rich space there is one or more catalyst materials and optionally inert packing materials and wherein the catalyst lean spaces optionally contain an inert packing material. It is envisioned that the Pre-Treatment Unit may be composed of more than one Pre-Treatment Unit, for example a blending unit, followed by a stripper column, wherein the stripper column separates the non-residual volatile components of the Distressed Fuel Oil Materials having a boiling temperature of less than 400° F. (205° C.) from the residual components of the Distressed Fuel Oil Materials and producing a distillate stream composed of at least a middle and heavy distillate and a residual stream composed of a Feedstock Heavy Marine Fuel Oil. In a preferred illustrative embodiment, the Pre-Treatment Unit comprises a blending unit, followed by a reactive distillation column, wherein the reactive distillation column comprises one or more structured beds, wherein the one or more structured beds comprises a plurality of catalyst retention structures, each catalyst retentions structure comprising at least two coplanar fluid permeable metal sheets, wherein at least one of the fluid permeable sheets is corrugated and wherein the two coplanar fluid permeable metal sheets define one or more catalyst rich spaces and one or more catalyst lean spaces, wherein within the catalyst rich space there is one or more catalyst materials and optionally inert packing materials and wherein the catalyst lean spaces optionally contain an inert packing material and wherein the reactive distillation column separates the non-residual volatile components of the Distressed Fuel Oil Materials having a boiling temperature of less than 400° F. (205° C.) from the residual components of the Distressed Fuel Oil Materials and producing a distillate stream composed of a middle and heavy distillate and a residual stream composed of a Feedstock Heavy Marine Fuel Oil.
A second aspect and illustrative embodiment encompasses a multi-stage process for the production of a Product Heavy Marine Fuel Oil that is ISO 8217:2017 and has a sulfur content (ISO 14596 or ISO 8754) between the range of 0.50 mass % to 0.05 mass % from DFOM that contain Environmental Contaminates. The illustrative process comprises of at least a pre-treatment process and the Core Process. The illustrative pre-treatment process involves the processing of the DFOM in a Pre-Treatment Unit under operative conditions to give a Feedstock Heavy Marine Fuel Oil that is ISO 8217 except for the environmental contaminates including a sulfur content (ISO 14596 or ISO 8754) between the range of 5.0 wt % to 0.50 wt % The exemplary Core Process includes: mixing a quantity of the Feedstock Heavy Marine Fuel Oil with a quantity of Activating Gas mixture to give a Feedstock Mixture; contacting the Feedstock Mixture with one or more catalysts under reactive conditions in a Reaction System to form a Process Mixture from the Feedstock Mixture; receiving said Process Mixture and separating the liquid components of the Process Mixture from the bulk gaseous components of the Process Mixture; subsequently separating any residual gaseous components and by-product hydrocarbon components from the Product Heavy Marine Fuel Oil; and, discharging the Product Heavy Marine Fuel Oil.
The inventive concepts as described herein utilize terms that should be well known to one of skill in the art, however certain terms are utilized having a specific intended meaning and these terms are defined below:
Core Process:
The inventive concepts are illustrated in more detail in this description referring to the drawings.
As for the properties of the Activating Gas, the Activating Gas should be selected from mixtures of nitrogen, hydrogen, carbon dioxide, gaseous water, and methane. The mixture of gases within the Activating Gas should have an ideal gas partial pressure of hydrogen (pH2) greater than 80% of the total pressure of the Activating Gas mixture (P) and more preferably wherein the Activating Gas has an ideal gas partial pressure of hydrogen (pH2) greater than 90% of the total pressure of the Activating Gas mixture (P). It will be appreciated by one of skill in the art that the molar content of the Activating Gas is another criterion the Activating Gas should have a hydrogen mole fraction in the range between 80% and 100% of the total moles of Activating Gas mixture.
The Feedstock Mixture (i.e. mixture of Feedstock HMFO and Activating Gas) is brought up to the process conditions of temperature and pressure and introduced into a Reactor System, preferably a reactor vessel, so the Feedstock Mixture is then contacted under reactive conditions with one or more catalysts (8) to form a Process Mixture from the Feedstock Mixture.
The Core Process conditions are selected so the ratio of the quantity of the Activating Gas to the quantity of Feedstock HMFO is 250 scf gas/bbl of Feedstock HMFO to 10,000 scf gas/bbl of Feedstock HMFO; and preferably between 2000 scf gas/bbl of Feedstock HMFO 1 to 5000 scf gas/bbl of Feedstock HMFO more preferably between 2500 scf gas/bbl of Feedstock HMFO to 4500 scf gas/bbl of Feedstock HMFO. The process conditions are selected so the total pressure in the first vessel is between of 250 psig and 3000 psig; preferably between 1000 psig and 2500 psig, and more preferably between 1500 psig and 2200 psig. The process reactive conditions are selected so the indicated temperature within the first vessel is between of 500° F. to 900° F., preferably between 650° F. and 850° F. and more preferably between 680° F. and 800° F. The process conditions are selected so the liquid hourly space velocity within the first vessel is between 0.05 oil/hour/m3 catalyst and 1.0 oil/hour/m3 catalyst; preferably between 0.08 oil/hour/m3 catalyst and 0.5 oil/hour/m3 catalyst; and more preferably between 0.1 oil/hour/m3 catalyst and 0.3 oil/hour/m3 catalyst to achieve deep desulfurization with product sulfur levels below 0.1 ppmw.
One of skill in the art will appreciate that the Core Process reactive conditions are determined considering the hydraulic capacity of the unit. Exemplary hydraulic capacity for the treatment unit may be between 100 bbl of Feedstock HMFO/day and 100,000 bbl of Feedstock HMFO/day, preferably between 1000 bbl of Feedstock HMFO/day and 60,000 bbl of Feedstock HMFO/day, more preferably between 5,000 bbl of Feedstock HMFO/day and 45,000 bbl of Feedstock HMFO/day, and even more preferably between 10,000 bbl of Feedstock HMFO/day and 30,000 bbl of Feedstock HMFO/day.
One of skill in the art will appreciate that a fixed bed reactor using a supported transition metal heterogeneous catalyst will be the technically easiest to implement and is preferred. However, alternative reactor types may be utilized including, but not limited to: ebulliated or fluidized bed reactors see US2017008160; US20170355913; U.S. Pat. Nos. 6,620,311; 5,298,151; 4,764,347 4,312,741 the contents of which are incorporated herein by reference; structured bed reactors (see U.S. Pat. Nos. 4,731,229; 5,073,236; 5,266,546; 5,431,890; 5,730,843; US2002068026; US20020038066; US20020068026; US20030012711; US20060065578; US20070209966; US20090188837; US2010063334; US2010228063; US20110214979; US20120048778; US20150166908; US20150275105; 20160074824; 20170101592 and US20170226433, the contents of which are incorporated herein by reference; three-phase bubble reactors see US20060047163; U.S. Pat. Nos. 7,960,581; 7,504,535; 4,666,588 4,345,992; 4,389,301; 3,870,623; and 2,875,150 the contents of which are incorporated herein by reference; reactive distillation bed reactors see U.S. Pat. Nos. 4,731,229; 5,073,236; 5,266,546; 5,431,890; 5,730,843; USUS2002068026; US 20020038066; US20020068026; US 20030012711; US20060065578; US20070209966; US20090188837; US2010063334; US2010228063; US20110214979; US20120048778; US20150166908; US20150275105; 20160074824; 20170101592 and US20170226433, the contents of which are incorporated herein by reference and the like all of which may be co-current or counter current. We also assume high flux or liquid full type reactors may be used such as those disclosed in U.S. Pat. Nos. 6,123,835; 6,428,686; 6,881,326; 7,291,257; 7,569,136 and other similar and related patents and patent applications.
The transition metal heterogeneous catalyst utilized comprises a porous inorganic oxide catalyst carrier and a transition metal catalytic metal. The porous inorganic oxide catalyst carrier is at least one carrier selected from the group consisting of alumina, alumina/boria carrier, a carrier containing metal-containing aluminosilicate, alumina/phosphorus carrier, alumina/alkaline earth metal compound carrier, alumina/titania carrier and alumina/zirconia carrier. The transition metal catalytic metal component of the catalyst is one or more metals selected from the group consisting of group 6, 8, 9 and 10 of the Periodic Table. In a preferred and illustrative embodiment, the transition metal heterogeneous catalyst is a porous inorganic oxide catalyst carrier and a transition metal catalyst, in which the preferred porous inorganic oxide catalyst carrier is alumina and the preferred transition metal catalyst is Ni—Mo, Co—Mo, Ni—W or Ni—Co—Mo. The process by which the transition metal heterogeneous catalyst is manufactured is known in the literature and preferably the catalysts are commercially available as hydrodemetallization catalysts, transition catalysts, desulfurization catalyst and combinations of these which might be pre-sulfided.
The Process Mixture (10) in this Core Process is removed from the Reactor System (8) and from being in contact with the one or more catalyst and is sent via fluid communication to a second vessel (12), preferably a gas-liquid separator or hot separators and cold separators, for separating the liquid components (14) of the Process Mixture from the bulk gaseous components (16) of the Process Mixture. The gaseous components (16) are treated beyond the battery limits of the immediate process. Such gaseous components may include a mixture of Activating Gas components and lighter hydrocarbons (mostly methane, ethane and propane but some wild naphtha) that may have been formed as part of the by-product hydrocarbons from the process.
The Liquid Components (16) in this Core Process are sent via fluid communication to a third vessel (18), preferably a fuel oil product stripper system, for separating any residual gaseous components (20) and by-product hydrocarbon components (22) from the Product HMFO (24). The residual gaseous components (20) may be a mixture of gases selected from the group consisting of: nitrogen, hydrogen, carbon dioxide, hydrogen sulfide, gaseous water, C1-C5 hydrocarbons. This residual gas is treated outside of the battery limits of the immediate process, combined with other gaseous components (16) removed from the Process Mixture (10) in the second vessel (12). The liquid by-product hydrocarbon component, which are condensable hydrocarbons formed in the process (22) may be a mixture selected from the group consisting of C4-C20 hydrocarbons (wild naphtha) (naphtha—diesel) and other condensable light liquid (C3-C8) hydrocarbons that can be utilized as part of the motor fuel blending pool or sold as gasoline and diesel blending components on the open market. These liquid by-product hydrocarbons should be less than 15% wt., preferably less than 5% wt. and more preferably less than 3% wt. of the overall process mass balance.
The Product HMFO (24) resulting from the Core Process is discharged via fluid communication into storage tanks beyond the battery limits of the immediate process. The Product HMFO complies with ISO 8217 and has a maximum sulfur content (ISO 14596 or ISO 8754) between the range of 0.05 mass % to 1.0 mass % preferably a sulfur content (ISO 14596 or ISO 8754) between the range of 0.05 mass % ppm and 0.7 mass % and more preferably a sulfur content (ISO 14596 or ISO 8754) between the range of 0.1 mass % and 0.5 mass %. The vanadium content of the Product HMFO is also ISO compliant with a maximum vanadium content (ISO 14597) between the range from 350 mg/kg to 450 ppm mg/kg, preferably a vanadium content (ISO 14597) between the range of 200 mg/kg and 300 mg/kg and more preferably a vanadium content (ISO 14597) between the range of 50 mg/kg and 100 mg/kg.
The Product HFMO should have bulk physical properties that are ISO 8217 compliant. The Product HMFO should exhibit Bulk Properties of: a maximum of kinematic viscosity at 50° C. (ISO 3104) between the range from 180 mm2/s to 700 mm2/s; a maximum of density at 15° C. (ISO 3675) between the range of 991.0 kg/m3 to 1010.0 kg/m3; a CCAI value in the range of 780 to 870; a flash point (ISO 2719) no lower than 60.0° C.; a total sediment—aged (ISO 10307-2) of less than 0.10 mass %; and a carbon residue—micro method (ISO 10370) lower than 20.00 mass %. The Product HMFO should have an aluminum plus silicon (ISO 10478) content of less than 60 mg/kg.
Relative the Feedstock HMFO, the Product HMFO will have a sulfur content (ISO 14596 or ISO 8754) between 1% and 20% of the maximum sulfur content of the Feedstock HMFO. That is the sulfur content of the Product HMFO will be reduced by about 80% or greater when compared to the Feedstock HMFO. Similarly, the vanadium content (ISO 14597) of the Product HMFO is between 1% and 20% of the maximum vanadium content of the Feedstock HMFO. One of skill in the art will appreciate that the above data indicates a substantial reduction in sulfur and vanadium content indicate a process having achieved a substantial reduction in the Environmental Contaminates from the Feedstock HMFO while maintaining the desirable properties of an ISO 8217 compliant and merchantable HMFO.
As a side note, the residual gaseous component is a mixture of gases selected from the group consisting of: nitrogen, hydrogen, carbon dioxide, hydrogen sulfide, gaseous water, C1-C5 hydrocarbons. An amine scrubber will effectively remove the hydrogen sulfide content which can then be processed using technologies and processes well known to one of skill in the art. In one preferable illustrative embodiment, the hydrogen sulfide is converted into elemental sulfur using the well-known Claus process. An alternative embodiment utilizes a proprietary process for conversion of the Hydrogen sulfide to hydrosulfuric acid. Either way, the sulfur is removed from entering the environment prior to combusting the HMFO in a ships engine. The cleaned gas can be vented, flared or more preferably recycled back for use as Activating Gas.
Product HMFO
The Product HFMO resulting from the disclosed illustrative process is of merchantable quality for sale and use as a heavy marine fuel oil (also known as a residual marine fuel oil or heavy bunker fuel) and exhibits the bulk physical properties required for the Product HMFO to be an ISO 8217 compliant (preferably ISO 8217 (2017)) residual marine fuel oil. The Product HMFO should exhibit the Bulk Properties of: a maximum of kinematic viscosity at 50° C. (ISO 3104) between the range from 180 mm2/s to 700 mm2/s; a density at 15° C. (ISO 3675) between the range of 991.0 kg/m3 to 1010.0 kg/m3; a CCAI is in the range of 780 to 870; a flash point (ISO 2719) no lower than 60° C.; a total sediment—aged (ISO 10307-2) less than 0.10% wt.; a carbon residue—micro method (ISO 10370) less than 20.00% wt.; The product HMFO should have an aluminum plus silicon (ISO 10478) content no more than of 60 mg/kg.
The Product HMFO has a sulfur content (ISO 14596 or ISO 8754) less than 0.5 wt % and preferably less than 0.1% wt. and complies with the IMO Annex VI (revised) requirements for a low sulfur and preferably an ultra-low sulfur HMFO. That is the sulfur content of the Product HMFO has been reduced by about 80% and preferably 90% or greater when compared to the Feedstock HMFO. Similarly, the vanadium content (ISO 14597) of the Product Heavy Marine Fuel Oil is less than 20% and more preferably less than 10% of the maximum vanadium content of the Feedstock Heavy Marine Fuel Oil. One of skill in the art will appreciate that a substantial reduction in sulfur and vanadium content of the Feedstock HMFO indicates a process having achieved a substantial reduction in the Environmental Contaminates from the Feedstock HMFO; of equal importance is this has been achieved while maintaining the desirable properties of an ISO 8217 compliant HMFO.
The Product HMFO not only complies with ISO 8217 (and is merchantable as a residual marine fuel oil or bunker fuel), the Product HMFO has a maximum sulfur content (ISO 14596 or ISO 8754) between the range of 0.05% wt. to 1.0% wt. preferably a sulfur content (ISO 14596 or ISO 8754) between the range of 0.05% wt. ppm and 0.5% wt. and more preferably a sulfur content (ISO 14596 or ISO 8754) between the range of 0.1% wt. and 0.5% wt. The vanadium content of the Product HMFO is well within the maximum vanadium content (ISO 14597) required for an ISO 8217 residual marine fuel oil exhibiting a vanadium content lower than 450 ppm mg/kg, preferably a vanadium content (ISO 14597) lower than 300 mg/kg and more preferably a vanadium content (ISO 14597) less than 50 mg/kg.
One knowledgeable in the art of marine fuel blending, bunker fuel formulations and the fuel requirements for marine shipping fuels will readily appreciate that without further compositional changes or blending, the Product HMFO can be sold and used as a low sulfur MARPOL Annex VI compliant heavy (residual) marine fuel oil that is a direct substitute for the high sulfur heavy (residual) marine fuel oil or heavy bunker fuel currently in use. One illustrative embodiment is an ISO 8217 compliant low sulfur heavy marine fuel oil comprising (and preferably consisting essentially of) hydroprocessed ISO 8217 compliant high sulfur heavy marine fuel oil, wherein the sulfur levels of the hydroprocessed ISO 8217 compliant high sulfur heavy marine fuel oil is greater than 0.5% wt. and wherein the sulfur levels of the ISO 8217 compliant low sulfur heavy marine fuel oil is less than 0.5% wt. Another illustrative embodiment is an ISO 8217 compliant ultra-low sulfur heavy marine fuel oil comprising (and preferably consisting essentially of) a hydroprocessed ISO 8217 compliant high sulfur heavy marine fuel oil, wherein the sulfur levels of the hydroprocessed ISO 8217 compliant high sulfur heavy marine fuel oil is greater than 0.5% wt. and wherein the sulfur levels of the ISO 8217 compliant low sulfur heavy marine fuel oil is less than 0.1% wt.
Because of the present invention, multiple economic and logistical benefits to the bunkering and marine shipping industries can be realized. The benefits include minimal changes to the existing heavy marine fuel bunkering infrastructure (storage and transferring systems); minimal changes to shipboard systems are needed to comply with emissions requirements of MARPOL Annex VI (revised); no additional training or certifications for crew members will be needed, amongst the realizable benefits. Refiners will also realize multiple economic and logistical benefits, including: no need to alter or rebalance the refinery operations, crude sources, and product streams to meet a new market demand for low sulfur or ultralow sulfur HMFO; no additional units are needed in the refinery with additional hydrogen or sulfur capacity because the illustrative process can be conducted as a stand-alone unit; refinery operations can remain focused on those products that create the greatest value from the crude oil received (i.e. production of petrochemicals, gasoline and distillate (diesel); refiners can continue using the existing slates of crude oils without having to switch to sweeter or lighter crudes to meet the environmental requirements for HMFO products.
Heavy Marine Fuel Composition
One aspect of the present inventive concept is a fuel composition comprising, but preferably consisting essentially of, the Product HMFO resulting from the processes disclosed, and may optionally include Diluent Materials. The Product HMFO itself complies with ISO 8217 and meets the global IMO Annex VI requirements for maximum sulfur content (ISO 14596 or ISO 8754). If ultra-low levels of sulfur are desired, the process of the present invention achieves this and one of skill in the art of marine fuel blending will appreciate that a low sulfur or ultra-low sulfur Product HMFO can be utilized as a primary blending stock to form a global IMO Annex VI compliant low sulfur Heavy Marine Fuel Composition. Such a low sulfur Heavy Marine Fuel Composition will comprise (and preferably consist essentially of): a) the Product HMFO and b) Diluent Materials. In one embodiment, the majority of the volume of the Heavy Marine Fuel Composition is the Product HMFO with the balance of materials being Diluent Materials. Preferably, the Heavy Marine Fuel Composition is at least 75% by volume, preferably at least 80% by volume, more preferably at least 90% by volume, and furthermore preferably at least 95% by volume Product HMFO with the balance being Diluent Materials.
Diluent Materials may be hydrocarbon or non-hydrocarbon based materials mixed into or combined with or added to, or solid particle materials suspended in, the Product HMFO. The Diluent Materials may intentionally or unintentionally alter the composition of the Product HMFO but not so the resulting mixture violates the ISO 8217 standards for residual marine fuels or fails to have a sulfur content lower than the global MARPOL standard of 0.5% wt. sulfur (ISO 14596 or ISO 8754). Examples of Diluent Materials considered hydrocarbon based materials include: Feedstock HMFO (i.e. high sulfur HMFO); distillate based fuels such as road diesel, gas oil, MGO or MDO; cutter oil (which is used in formulating residual marine fuel oils); renewable oils and fuels such as biodiesel, methanol, ethanol, and the like; synthetic hydrocarbons and oils based on gas to liquids technology such as Fischer-Tropsch derived oils, synthetic oils such as those based on polyethylene, polypropylene, dimer, trimer and poly butylene; refinery residues or other hydrocarbon oils such as atmospheric residue, vacuum residue, fluid catalytic cracker (FCC) slurry oil, FCC cycle oil, pyrolysis gasoil, cracked light gas oil (CLGO), cracked heavy gas oil (CHGO), light cycle oil (LCO), heavy cycle oil (HCO), thermally cracked residue, coker heavy distillate, bitumen, de-asphalted heavy oil, visbreaker residue, slop oils, asphaltinic oils; used or recycled motor oils; lube oil aromatic extracts and crude oils such as heavy crude oil, distressed crude oils and similar materials that might otherwise be sent to a hydrocracker or diverted into the blending pool for a prior art high sulfur heavy (residual) marine fuel oil. Examples of Diluent Materials considered non-hydrocarbon based materials include: residual water (i.e. water absorbed from the humidity in the air or water that is miscible or solubilized, sometimes as microemulsions, into the hydrocarbons of the Product HMFO), fuel additives which can include, but are not limited to detergents, viscosity modifiers, pour point depressants, lubricity modifiers, de-hazers (e.g. alkoxylated phenol formaldehyde polymers), antifoaming agents (e.g. polyether modified polysiloxanes); ignition improvers; anti rust agents (e.g. succinic acid ester derivatives); corrosion inhibitors; anti-wear additives, anti-oxidants (e.g. phenolic compounds and derivatives), coating agents and surface modifiers, metal deactivators, static dissipating agents, ionic and nonionic surfactants, stabilizers, cosmetic colorants and odorants and mixtures of these. A third group of Diluent Materials may include suspended solids or fine particulate materials that are present because of the handling, storage and transport of the Product HMFO or the Heavy Marine Fuel Composition, including but not limited to: carbon or hydrocarbon solids (e.g. coke, graphitic solids, or micro-agglomerated asphaltenes), iron rust and other oxidative corrosion solids, fine bulk metal particles, paint or surface coating particles, plastic or polymeric or elastomer or rubber particles (e.g. resulting from the degradation of gaskets, valve parts, etc. . . . ), catalyst fines, ceramic or mineral particles, sand, clay, and other earthen particles, bacteria and other biologically generated solids, and mixtures of these that may be present as suspended particles, but otherwise don't detract from the merchantable quality of the Heavy Marine Fuel Composition as an ISO 8217 compliant heavy (residual) marine fuel.
The blend of Product HMFO and Diluent Materials must be of merchantable quality as a low sulfur heavy (residual) marine fuel. That is the blend must be suitable for the intended use as heavy marine bunker fuel and generally be fungible and compatible as a bunker fuel for ocean going ships. Preferably the Heavy Marine Fuel Composition must retain the bulk physical properties required of an ISO 8217 compliant residual marine fuel oil and a sulfur content lower than the global MARPOL standard of 0.5% wt. sulfur (ISO 14596 or ISO 8754) so that the material qualifies as MARPOL Annex VI Low Sulfur Heavy Marine Fuel Oil (LS-HMFO). The sulfur content of the Product HMFO can be lower than 0.5% wt. (i.e. below 0.1% wt sulfur (ISO 14596 or ISO 8754)) to qualify as a MARPOL Annex VI compliant Ultra-Low Sulfur Heavy Marine Fuel Oil (ULS-HMFO) and a Heavy Marine Fuel Composition likewise can be formulated to qualify as a MARPOL Annex VI compliant ULS-HMFO suitable for use as marine bunker fuel in the ECA zones. To qualify as an ISO 8217 qualified fuel, the Heavy Marine Fuel Composition of the present invention must meet those internationally accepted standards. Those include Bulk Properties of: a maximum of kinematic viscosity at 50° C. (ISO 3104) between the range from 180 mm2/s to 700 mm2/s; a density at 15° C. (ISO 3675) between the range of 991.0 kg/m3 to 1010.0 kg/m3; a CCAI is in the range of 780 to 870; a flash point (ISO 2719) no lower than 60° C.; a total sediment—aged (ISO 10307-2) less than 0.10% wt.; and a carbon residue—micro method (ISO 10370) less than 20% wt. The Heavy Marine Fuel Composition must also have an aluminum plus silicon (ISO 10478) content no more than of 60 mg/kg.
Core Process Production Plant Description:
Turning now to a more detailed illustrative embodiment of a production plant,
In
The Feedstock HMFO (A) is withdrawn from the Oil Feed Surge Drum (1) via line (1b) by the Oil Feed Pump (3) and is pressurized to a pressure required for the process. The pressurized HMFO (A′) then passes through line (3a) to the Oil Feed/Product Heat Exchanger (5) where the pressurized HMFO Feed (A′) is partially heated by the Product HMFO (B). The pressurized Feedstock HMFO (A′) passing through line (5a) is further heated against the effluent from the Reactor System (E) in the Reactor Feed/Effluent Heat Exchanger (7).
The heated and pressurized Feedstock HMFO (A″) in line (7a) is then mixed with Activating Gas (C) provided via line (23c) at Mixing Point (X) to form a Feedstock Mixture (D). The mixing point (X) can be any well know gas/liquid mixing system or entrainment mechanism well known to one skilled in the art.
The Feedstock Mixture (D) passes through line (9A) to the Reactor Feed Furnace (9) where the Feedstock Mixture (D) is heated to the specified process temperature. The Reactor Feed Furnace (9) may be a fired heater furnace or any other kind to type of heater as known to one of skill in the art if it will raise the temperature of the Feedstock Mixture (D) to the desired temperature for the process conditions.
The fully Heated Feedstock Mixture (D′) exits the Reactor Feed Furnace (9) via line 9B and is fed into the Reactor System (11). The fully Heated Feedstock Mixture (D′) enters the Reactor System (11) where environmental contaminates, such a sulfur, nitrogen, and metals are preferentially removed from the Feedstock HMFO component of the fully Heated Feedstock Mixture. The Reactor System contains a catalyst which preferentially removes the sulfur compounds in the Feedstock HMFO component by reacting them with hydrogen in the Activating Gas to form hydrogen sulfide. The Reactor System will also achieve demetallization, denitrogenation, and a certain amount of ring opening hydrogenation of the complex aromatics and asphaltenes, however minimal hydrocracking of hydrocarbons should take place. The process conditions of hydrogen partial pressure, reaction pressure, temperature and residence time as measured liquid hourly velocity are optimized to achieve desired final product quality. A more detailed discussion of the Reactor System, the catalyst, the process conditions, and other aspects of the process are contained below in the “Reactor System Description.”
The Reactor System Effluent (E) exits the Reactor System (11) via line (11a) and exchanges heat against the pressurized and partially heats the Feedstock HMFO (A′) in the Reactor Feed/Effluent Exchanger (7). The partially cooled Reactor System Effluent (E′) then flows via line (11c) to the Hot Separator (13).
The Hot Separator (13) separates the gaseous components of the Reactor System Effluent (F) which are directed to line (13a) from the liquid components of the Reactor System effluent (G) which are directed to line (13b). The gaseous components of the Reactor System effluent in line (13a) are cooled against air in the Hot Separator Vapor Air Cooler (15) and then flow via line (15a) to the Cold Separator (17).
The Cold Separator (17) further separates any remaining gaseous components from the liquid components in the cooled gaseous components of the Reactor System Effluent (F′). The gaseous components from the Cold Separator (F″) are directed to line (17a) and fed onto the Amine Absorber (21). The Cold Separator (17) also separates any remaining Cold Separator hydrocarbon liquids (H) in line (17b) from any Cold Separator condensed liquid water (I). The Cold Separator condensed liquid water (I) is sent OSBL via line (17c) for treatment.
The hydrocarbon liquid components of the Reactor System effluent from the Hot Separator (G) in line (13b) and the Cold Separator hydrocarbon liquids (H) in line (17b) are combined and are fed to the Oil Product Stripper System (19). The Oil Product Stripper System (19) removes any residual hydrogen and hydrogen sulfide from the Product HMFO (B) which is discharged in line (19B) to storage OSBL. We also assume a second draw (not shown) may be included to withdraw a distillate product, preferably a middle to heavy distillate. The vent stream (M) from the Oil Product Stripper in line (19A) may be sent to the fuel gas system or to the flare system that are OSBL. A more detailed discussion of the Oil Product Stripper System is contained in the “Oil Product Stripper System Description.”
The gaseous components from the Cold Separator (F″) in line (17a) contain a mixture of hydrogen, hydrogen sulfide and light hydrocarbons (mostly methane and ethane). This vapor stream (17a) feeds an Amine Absorber System (21) where it is contacted against Lean Amine (J) provided OSBL via line (21a) to the Amine Absorber System (21) to remove hydrogen sulfide from the gases making up the Activating Gas recycle stream (C′). Rich amine (K) which has absorbed hydrogen sulfide exits the bottom of the Amine Absorber System (21) and is sent OSBL via line (21b) for amine regeneration and sulfur recovery.
The Amine Absorber System overhead vapor in line (21c) is preferably recycled to the process as a Recycle Activating Gas (C′) via the Recycle Compressor (23) and line (23a) where it is mixed with the Makeup Activating Gas (C″) provided OSBL by line (23b). This mixture of Recycle Activating Gas (C′) and Makeup Activating Gas (C″) to form the Activating Gas (C) utilized in the process via line (23c) as noted above. A Scrubbed Purge Gas stream (H) is taken from the Amine Absorber System overhead vapor line (21c) and sent via line (21d) to OSBL to prevent the buildup of light hydrocarbons or other non-condensable hydrocarbons. A more detailed discussion of the Amine Absorber System is contained in the “Amine Absorber System Description.”
Reactor System Description:
The Core Process Reactor System (11) illustrated in
A description of the process catalyst, the selection of the process catalyst and the loading and grading of the catalyst within the reactor vessel is contained in the “Catalyst in Reactor System”.
Alternative configurations for the Core Process Reactor System (11) are contemplated. In one illustrative configuration, more than one reactor vessel may be utilized in parallel as shown in
In the embodiment in
A cascading series in
An alternative implementation of the parallel reactor concept is illustrated in greater detail in
One of skill in the art upon careful review of the illustrated configuration will appreciate that multiple flow schemes and configurations can be achieved with the illustrated arrangement of reactor vessels, control valves and interconnected lines forming the reactor System. For example, in one configuration one can: open all of inflow diversion control valves (68, 68a, 68b and 68c); open the reactor inlet valves (60, 60a, 60b, 60c, and 60d); open the reactor outlet valves (62, 62a, 62b, 62c and 62d); open the outflow diversion control valves (70, 70a, 70b and 70c); and close lower by-pass control valve (64, 64a, 64b, 64c) and upper by-pass control valve (66, 66a, 66b and 66c), to substantially achieve a reactor configuration of five parallel reactors each receiving heated Feed Mixture (D′) from line (9B) and discharging Reactor Effluent (E) into line (11a). In such a configuration, the reactors are loaded with catalyst in substantially the same manner. One of skill in the art will also appreciate that closing of an individual reactor inlet valve and corresponding reactor outlet valve (for example closing reactor inlet vale 60 and closing reactor outlet valve 62) effectively isolates the reactor vessel (11). This will allow for the isolated reactor vessel (11) to be brought off line and serviced and or reloaded with catalyst while the remaining reactors continue to transform Feedstock HMFO into Product HMFO.
A second illustrative configuration of the control valves allows for the reactors to work in series as shown in
Another illustrative embodiment of the replacement of the single reactor vessel Reactor System 11 in
One of skill in the art will quickly realize and appreciate that by opening and closing the valves and varying the catalyst loads present in each reactor, many configurations may be achieved. One such configuration would be to open valves numbered: 60, 62, 72, 76, 78, 80, 82, 84, 72a, 64, 66, 68a, 60a, 62a, 72b, 76a, 78a, and 80b, with all other valves closed so the flow for heated Feed Mixture (D′) will pass through reactors 11, 14, 12a and 14a in series. Another such configuration would be to open valves numbered: 60, 62, 70, 64, 66, 68a, 60a, 62a, 72b, 76a, 78a, and 80b, with all other valves closed so the flow of heated Feed Mixture (D′) will pass through reactors 11, 12a and 14a (but not 14). As with the prior example, the nature of the Feedstock HSFO and the catalyst loaded in each reactor may be optimized and adjusted to achieve the desired Product HSFO properties, however for brevity of disclose all such variations will be apparent to one of skill in the art.
One benefit of having a multi-reactor Reactor System is that it allows for a reactor experiencing decreased activity or plugging because of coke formation can be isolated and taken off line for turn-around (i.e. deactivated, catalyst and internals replaced, etc. . . . ) without the entire plant having to shut down. Another benefit as noted above is that it allows one to vary the catalyst loading in the Reactor System so the overall process can be optimized for a specific Feedstock HSFO. A further benefit is that one can design the piping, pumps, heaters/heat exchangers, etc. . . . to have excess capacity so that when an increase in capacity is desired, additional reactors can be quickly brought on-line. Conversely, it allows an operator to take capacity off line, or turn down a plant output without having a concern about turn down and minimum flow through a reactor. While the above matrix Reactor System is described referring to a fixed bed or packed bed trickle flow reactor, one of skill in the art will appreciate that other reactor types may be utilized. For example, one or more reactors may be configured to be ebulliated bed up flow reactors or three phase upflow bubble reactors, or counter-current reactors, or reactive distillation reactors the configuration of which will be known to one of skill in the art. It is anticipated that many other operational and logistical benefits will be realized by one of skill in the art from the Reactor Systems configurations disclosed.
Catalyst in Reactor System:
The reactor vessel in each Reactor System is loaded with one or more process catalysts. The exact design of the process catalyst system is a function of feedstock properties, product requirements and operating constraints and optimization of the process catalyst can be carried out by routine trial and error by one of ordinary skill in the art.
The process catalyst(s) comprise at least one metal selected from the group consisting of the metals each belonging to the groups 6, 8, 9 and 10 of the Periodic Table, and more preferably a mixed transition metal catalyst such as Ni—Mo, Co—Mo, Ni—W or Ni—Co—Mo are utilized. The metal is preferably supported on a porous inorganic oxide catalyst carrier. The porous inorganic oxide catalyst carrier is at least one carrier selected from the group consisting of alumina, alumina/boria carrier, a carrier containing metal-containing aluminosilicate, alumina/phosphorus carrier, alumina/alkaline earth metal compound carrier, alumina/titania carrier and alumina/zirconia carrier. The preferred porous inorganic oxide catalyst carrier is alumina. The pore size and metal loadings on the carrier may be systematically varied and tested with the desired feedstock and process conditions to optimize the properties of the Product HMFO. One of skill in the art knows that demetallization using a transition metal catalyst (such a CoMo or NiMo) is favored by catalysts with a relatively large surface pore diameter and desulfurization is favored by supports having a relatively small pore diameter. Generally the surface area for the catalyst material ranges from 200-300 m2/g. The systematic adjustment of pore size and surface area, and transition metal loadings activities to preferentially form a demetallization catalyst or a desulfurization catalyst are well known and routine to one of skill in the art. Catalyst in the fixed bed reactor(s) may be dense-loaded or sock-loaded and including inert materials (such as glass or ceric balls) may be needed to ensure the desired porosity.
The catalyst selection utilized within and for loading the Reactor System may be preferential to desulfurization by designing a catalyst loading scheme that results in the Feedstock mixture first contacting a catalyst bed that with a catalyst preferential to demetallization followed downstream by a bed of catalyst with mixed activity for demetallization and desulfurization followed downstream by a catalyst bed with high desulfurization activity. In effect the first bed with high demetallization activity acts as a guard bed for the desulfurization bed.
The objective of the Reactor System is to treat the Feedstock HMFO at the severity required to meet the Product HMFO specification. Demetallization, denitrogenation and hydrocarbon hydrogenation reactions may also occur to some extent when the process conditions are optimized so the performance of the Reactor System achieves the required level of desulfurization. Hydrocracking is preferably minimized to reduce the volume of hydrocarbons formed as by-product hydrocarbons to the process. The objective of the process is to selectively remove the environmental contaminates from Feedstock HMFO and minimize the formation of unnecessary by-product hydrocarbons (C1-C8 hydrocarbons).
The process conditions in each reactor vessel will depend upon the feedstock, the catalyst utilized and the desired properties of the Product HMFO. Variations in conditions are to be expected by one of ordinary skill in the art and these may be determined by pilot plant testing and systematic optimization of the process. With this in mind it has been found that the operating pressure, the indicated operating temperature, the ratio of the Activating Gas to Feedstock HMFO, the partial pressure of hydrogen in the Activating Gas and the space velocity all are important parameters to consider. The operating pressure of the Reactor System should be in the range of 250 psig and 3000 psig, preferably between 1000 psig and 2500 psig and more preferably between 1500 psig and 2200 psig. The indicated operating temperature of the Reactor System should be 500° F. to 900° F., preferably between 650° F. and 850° F. and more preferably between 680° F. and 800° F. The ratio of the quantity of the Activating Gas to the quantity of Feedstock HMFO should be in the range of 250 scf gas/bbl of Feedstock HMFO to 10,000 scf gas/bbl of Feedstock HMFO, preferably between 2000 scf gas/bbl of Feedstock HMFO to 5000 scf gas/bbl of Feedstock HMFO and more preferably between 2500 scf gas/bbl of Feedstock HMFO to 4500 scf gas/bbl of Feedstock HMFO. The Activating Gas should be selected from mixtures of nitrogen, hydrogen, carbon dioxide, gaseous water, and methane, so Activating Gas has an ideal gas partial pressure of hydrogen (pH2) greater than 80% of the total pressure of the Activating Gas mixture (P) and preferably wherein the Activating Gas has an ideal gas partial pressure of hydrogen (pH2) greater than 90% of the total pressure of the Activating Gas mixture (P). The Activating Gas may have a hydrogen mole fraction in the range between 80% of the total moles of Activating Gas mixture and more preferably wherein the Activating Gas has a hydrogen mole fraction between 80% and 90% of the total moles of Activating Gas mixture. The liquid hourly space velocity within the Reactor System should be between 0.05 oil/hour/m3 catalyst and 1.0 oil/hour/m3 catalyst; preferably between 0.08 oil/hour/m3 catalyst and 0.5 oil/hour/m3 catalyst and more preferably between 0.1 oil/hour/m3 catalyst and 0.3 oil/hour/m3 catalyst to achieve deep desulfurization with product sulfur levels below 0.1 ppmw.
The hydraulic capacity rate of the Reactor System should be between 100 bbl of Feedstock HMFO/day and 100,000 bbl of Feedstock HMFO/day, preferably between 1000 bbl of Feedstock HMFO/day and 60,000 bbl of Feedstock HMFO/day, more preferably between 5,000 bbl of Feedstock HMFO/day and 45,000 bbl of Feedstock HMFO/day, and even more preferably between 10,000 bbl of Feedstock HMFO/day and 30,000 bbl of Feedstock HMFO/day. The desired hydraulic capacity may be achieved in a single reactor vessel Reactor System or in a multiple reactor vessel Reactor System as described.
Oil Product Stripper System Description:
The Oil Product Stripper System (19) comprises a stripper column (also known as a distillation column or exchange column) and ancillary equipment including internal elements and utilities required to remove hydrogen, hydrogen sulfide and hydrocarbons lighter than diesel from the Product HMFO. Such systems are well known to one of skill in the art, see U.S. Pat. Nos. 6,640,161; 5,709,780; 5,755,933; 4,186,159; 3,314,879; 3,844,898; 4,681,661; or U.S. Pat. No. 3,619,377 the contents of which are incorporated herein by reference, a generalized functional description is provided herein. Liquid from the Hot Separator (13) and Cold Separator (7) feed the Oil Product Stripper Column (19). Stripping of hydrogen and hydrogen sulfide and hydrocarbons lighter than diesel may be achieved via a reboiler, live steam or other stripping medium. The Oil Product Stripper System (19) may be designed with an overhead system comprising an overhead condenser, reflux drum and reflux pump or it may be designed without an overhead system. The conditions of the Oil Product Stripper may be optimized to control the bulk properties of the Product HMFO, more specifically viscosity and density. We also assume a second draw (not shown) may be included to withdraw a distillate product, preferably a middle to heavy distillate.
Amine Absorber System Description:
The Amine Absorber System (21) comprises a gas liquid contacting column and ancillary equipment and utilities required to remove sour gas (i.e. hydrogen sulfide) from the Cold Separator vapor feed so the resulting scrubbed gas can be recycled and used as Activating Gas. Because such systems are well known to one of skill in the art, see U.S. Pat. Nos. 4,425,317; 4,085,199; 4,080,424; 4,001,386; which are incorporated herein by reference, a generalized functional description is provided herein. Vapors from the Cold Separator (17) feed the contacting column/system (19). Lean Amine (or other suitable sour gas stripping fluids or systems) provided from OSBL is utilized to scrub the Cold Separator vapor so hydrogen sulfide is effectively removed. The Amine Absorber System (19) may be designed with a gas drying system to remove the any water vapor entrained into the Recycle Activating Gas (C′). The absorbed hydrogen sulfide is processed using conventional means OSBL in a tail gas treating unit, such as a Claus combustion sulfur recovery unit or sulfur recovery system that generates sulfuric acid.
Distressed Fuel Oil Materials Pre-Treatment Unit:
It will be appreciated by one of skill in the art, that the conditions utilized in the Core Process have been intentionally selected to minimize cracking of hydrocarbons and remove significant levels of sulfur by taking advantage of the properties of the Feedstock HMFO. However, one of skill in the art will also appreciate there are number of Distressed Fuel Oil Materials (DFOM) that alone or in combination may be pre-treated to provide a suitable Feedstock HMFO. The economic advantages of this will be apparent; low cost Distressed Fuel Oil Materials (DFOM), (i.e. materials that do not meet the ISO 8217 standards for a residual marine fuel oil and are sold at a substantial discount) may be pre-treated and then utilized as Feedstock HMFO in the Core Process to produce high value Product HMFO. Examples of DFOM include, but are not limited to: heavy hydrocarbons such as atmospheric residue; vacuum residue; FCC slurry oil; black oil, crude oils such as heavy crude oil, distressed crude oil, slop oils, de-asphalted oil (DAO), heavy coker oil, visbreaker bottoms, bitumen tars, and the like; non-merchantable residual fuel oils contaminated with high levels of solids, water, resins, acrylic or styrene oligomers, cumene, phenols, or other materials that make the Fuel Oil non-merchantable; DFOM also include off specification or distressed marine distillate and blends of marine distillate with residual high sulfur fuel oils that are not ISO 8217 compliant. An example of such a material would be a distillate/heavy marine fuel oil blend that has a 4 or 5 rating on ASTM D4740 compatibility tests. DFOM in and of themselves are not ISO 8217 compliant materials and are not merchantable as a residual ISO 8217 compliant Heavy Marine Fuel Oil or as a substitute for Heavy Marine Fuel Oil and sold at a considerable discount to the compliant materials.
The generalized purpose for the DFOM Pre-Treatment Unit is to condition or treat the DFOM so they may be utilized as a feedstock HMFO in the Core Process. This conditioning or treatment of the DFOM may involve treatment conditions including, but not limited to: blending DFOM with distillates or heavy gas oil; blending DFOM with HMFO; blending DFOM with other DFOM's together; and then optionally the subjecting the DFOM or DFOM blended material to additional treatment conditions such as: exposure to selective absorption materials; ultrafiltration; centrifugation; microwaves; ultrasound; gravity separation; gas purging (scrubbing) with nitrogen or other inert gases; ionic liquid extraction; extraction or washing the DFOM or DFOM blended material with water (with or without surfactants present); washing or counter-current extraction with non-miscible polar fluids such as acetonitrile, ethylene glycol, diethylene glycol, 2-aminoethanol, benzyl alcohol, ethylacetoacetates or other materials having a relative polarity greater than 0.6 on a scale where water has a polarity of 1.0 or a polarity index greater than about 5.5; super critical fluids such as supercritical CO2 or supercritical water may also be utilized as extraction medium under conditions well known in the art; subjecting the DFOM or DFOM blended material to vacuum; subjecting the DFOM or DFOM blended material to heat sufficient to volatilize components having a boiling point below 350° F. (177° C.) at standard pressure, preferably below 400° F. (205° C.) at standard pressure and more preferably below 500° F. (260° C.), and optionally heating to those same temperatures under vacuum. Sometimes it may be desirable to blend the DFOM with a co-solvent or co-volatilizing material to enhance the volatilization of the certain components over other components. Such co-solvents or co-volatilizing materials will have a boiling point preferably the same as or form an azeotrope with the components to be removed from the DFOM in the pre-treatment step. When the DFOM or DFOM blended material and other materials are heated this preferably will occur under conditions of controlled distillation so the volatilized materials can be selectively separated by boiling point, condensed and withdrawn so they may be reused or sent to other parts of the refinery for commercialization. The above functional description of the DFOM Pre-Treatment Unit has been sufficiently disclosed to one of skill in the art, this additional description provides information that will be helpful to one of skill in the art by providing more specific illustrative embodiments.
Blending Pre-Treatment Unit:
One illustrative embodiment of a pre-treatment process involves the blending of the DFOM with a Blending Agent. The blending of DFOM with a Blending Agent will address deficiencies such as pour point, density, viscosity, CCAI (calculated carbon aromaticity index) excessive metals content, high levels of nitrogen or high solids content. As used herein, a Blending Agent will preferably be a hydrocarbon such as gas oil, FCC slurry oil, gas oil, diesel, middle distillate or heavy distillate cuts, cutter oil, condensable hydrocarbons generated in the Core Process, heavy or middle coker oils, and mixtures of these that serve as a diluent to the DFOM. Surfactants or other supplemental blending agents may be needed to ensure a uniform and rapid blending of the DFOM with the Blending Agreement, but adding surfactants is not preferred. The functional role of the Blending Agent is to adjust the properties by dilution of the DFOM so the DFOM becomes ISO 8217 compliant feedstock HMFO suitable for the Core Process. It will be appreciated by one of skill in the art that the ratio or relative proportions of DFOM to Blending Agent will be dependent not only on the nature and properties of the DFOM, but also those of the selected Blending Agent. For example a simple reduction in viscosity may be achieved by mixing DFOM with a middle or heavy distillate fraction such as cutter oil. Similarly, the density of the DFOM may be adjusted by blending the DFOM with a small portion of diesel or recycled middle or heavy distillate materials produced in the Core Process. It will be a simple matter of adjusting the ratios of materials being blended to achieve the desired properties of the Feedstock HMFO.
An example of a Blending Pre-Treatment Unit is schematically illustrated in
Stripper Pre-Treatment Unit:
In one illustrative embodiment of the Pre-Treatment Unit in
Steam, air, inert gases, and light hydrocarbon gases can be the stripping agent (S) to separate the residual components of the DFOM from the non-residual volatile components of the DFOM. Selection of the stripping agent (S) will depend upon solubility, stability, and availability as well as ability to remove the non-residual volatile components of the DFOM. Because the stripping agents (S) will be preferably gases, operation at nearly the highest temperature and lowest pressure that will maintain the components of the DFOM desired in the Feedstock HMFO and vaporize the volatile components in the DFOM feed stream is desired.
One of skill in the art will appreciate that strippers can be trayed or packed. Packed column strippers, as shown in
Trayed strippers can have sieve, valve, or bubble cap trays while packed strippers can have either structured packing or random packing. Trays and packing are used to increase the contact area over which mass transfer can occur as mass transfer theory dictates. Packing can have varying material, surface area, flow area, and associated pressure drop. Older generation packing include ceramic Raschig rings and Berl saddles. More common packing materials are metal and plastic Pall rings, metal and plastic Zbigniew Bialecki rings, and ceramic Intalox saddles. Each packing material improves the surface area, the flow area, and/or the associated pressure drop across the packing. Also important, is the ability of the packing material to not stack on top of itself. If such stacking occurs, it drastically reduces the surface area of the material.
During operation, monitoring the pressure drop across the column can help to determine the performance of the stripper. A changed pressure drop over a significant range of time can indicate that the packing may need to be replaced or cleaned.
Distillation Pre-Treatment Unit:
When the DFOM material has significant non-residual volatile materials, such as diesel, MGO or lighter materials, it may be economically advantageous to subject the DFOM to a distillation process so the non-residual volatile materials can be recovered. The distillation pre-treatment of the DFOM will also address deficiencies such as flash point, high content of H2S or water.
One of skill in the art will appreciate that in certain embodiments it may be desirable to incorporate catalytic materials within the internal structures of the Distillation Pre-Treatment Unit. A description of suitable structured catalyst beds is below.
Structured Catalyst Bed
Turning now to the structured catalyst bed, similar beds have been disclosed in the prior art in reactive distillation configurations involving catalyst promoted reactions. See for example U.S. Pat. Nos. 4,731,229; 5,073,236; 5,266,546; 5,431,890; 5,730,843; USUS2002068026; US20020038066; US20020068026; US20030012711; US20060065578; US20070209966; US20090188837; US2010063334; US2010228063; US20110214979; US20120048778; US20150166908; US20150275105; 20160074824; 20170101592 and US20170226433, the contents of which are incorporated herein by reference. However these disclosures involve the product being distilled from heavier bottoms or feedstock materials. For example heavy and light naphtha streams are desulfurized with the desired light naphtha being the desired product for the gasoline pool and the heavy naphtha either recycled or sent to an FCC cracker for further upgrading. The process of the invention utilized the distillation separation process to remove undesired by-product hydrocarbons and gases produced by the catalytic reaction (i.e. ammonia and hydrogen sulfide) and the desired product is the bottoms stream is catalytically treated, but not distilled. The structured catalyst beds as described above balance the catalyst density load, the catalyst activity load and the desired liquid space velocity through the reactor so an effective separation or distillation of purified lighter products can be produced. In contrast the present process functionally combines the functioning of a reactor with a stripper column or knock down drum. A further problem solved by the structured catalyst bed is to reduce the pressure drop through the catalyst beds and provision of sufficient contact of the Distressed Fuel Oil Materials with the catalyst and mixing with an Activating Gas.
A first illustrative embodiment of the structured catalyst beds is shown in
A second illustrative embodiment of the structured catalyst beds is shown in
The loading of the catalyst structures will depend upon the particle size of the catalyst materials and the activity level of the catalyst. The structures should be loaded so the open space will be at least 10 volume % of the overall structural volume, and preferably will be up to about 65% of the overall structural volume. Active catalyst materials should be loaded in the catalyst support structure at a level dependent upon the catalyst activity level and the desired level of treatment. For example a catalyst material highly active for desulfurization may be loaded at a lower density than a less active desulfurization catalyst material and yet still achieve the same overall balance of catalyst activity per volume. One of skill in the art will appreciate that by systematically varying the catalyst loaded per volume and the catalyst activity level one may optimize the activity level and fluid permeability levels of the structured catalyst bed. In one such example, the catalyst density is so over 50% of the open space in the catalyst rich space, which may occupy only have of the over space within the structured catalyst bed. In another example catalyst rich space is loaded (i.e. dense packed into each catalyst rich space), however the catalyst rich space may occupy only 30 volume % of the overall structured catalyst bed. It will be appreciated that the catalyst density in the catalyst rich space may vary between 30 vol % and 100 vol % of the catalyst rich space. It will be further appreciated that that catalyst rich space may occupy as little as 10 vol % of the overall structured catalyst bed or it may occupy as much as 80 vol % of the overall structured catalyst bed.
The liquid hourly space velocity within the structured catalyst beds should be between 0.05 oil/hour/m3 catalyst and 10.0 oil/hour/m3 catalyst; preferably between 0.08 oil/hour/m3 catalyst and 5.0 oil/hour/m3 catalyst and more preferably between 0.1 oil/hour/m3 catalyst and 3.0 oil/hour/m3 catalyst to achieve deep desulfurization using a highly active desulfurization catalyst and this will achieve a product with sulfur levels below 0.1 ppmw. However, it will be appreciated by one of skill in the art that when there is lower catalyst density, it may be desirable to adjust the space velocity to value outside of the values disclosed.
One of skill in the art will appreciate that the above described structured catalyst beds can serve as a direct substitute for dense packed beds that include inert materials, such as glass beads and the like. An important criteria is the catalyst density within the beds themselves. The structured catalyst beds can be loaded with a catalyst density comparable to that of a dense loaded bed with a mixture of catalyst and inert materials or a bed with layers of catalyst and inert materials. Determining the optimized catalyst density will be a simple matter of systematically adjusting the catalyst density (for a set of reaction conditions) in a pilot plant. A fixed density catalyst structure will be made and the reaction parameters of space velocity and temperature and bed depth will be systematically varied and optimized.
Reactive Distillation Pre-Treatment Unit:
As illustrated in
As shown, an Activating Gas (C′″) may be provided via line (514) to both quench and create within the reactor a counter-current flow of Activating Gas within the reactor vessel. One of skill in the art will appreciate this flow may also be connected to the reactor vessel so make up Activating Gas is also injected between structured catalyst beds (506) and (504) and (504) and (502). In the upper portion of the reactor vessel, inert distillation packing beds (510 and 512) may be located. It may be desirably and optionally it is preferable for the lower most of these upper beds (510) to be a structured catalyst bed as well with catalyst for the desulfurization of the distillate materials. In such an instance a down comber tray or similar liquid diversion tray (514) is inserted so a flow of middle to heavy distillate (G′) can be removed from the upper portion of the reactor via line (526). Light hydrocarbons (i.e. lighter than middle distillate) exits the top of the reactor via line (516) and passes through heat exchanger (517) to help with heat recovery. This stream is then directed to the reflux drum (518) in which liquids are collected for use as reflux materials. The reflux loop to the upper reactor is completed via reflux pump (522) and reflux line (524). That portion of the lights not utilized in the reflux are combined with similar flows (F and G) via lines (13a) and (13b) respectively.
One of skill in the art of reactive distillation reactor design will note that unlike the prior art reactive distillation processes and reactor designs, the present invention presents multiple novel and non-obvious (i.e. inventive step) features. One such aspect, as noted above, the DFOM enters the upper portion of the reactor above the structured catalytic beds. In doing so it is transformed into Feedstock HMFO (A) that exits the bottom of the reactor. One of skill in the art will appreciate that by this flow, the majority of Feedstock HMFO material (which is characterized as being residual, that is having a boil point greater than 500° F. (260° C.) at standard pressure, preferably greater than 600° F. (315° C.) at standard pressure and more preferably greater than 650° F. (343° C.)) that is the primary product of this Pre-Treatment Unit will not be volatile or distilled, but any by product gases, contaminating materials, distillate hydrocarbons or light hydrocarbons are volatilized into the upper portion of the reactor. The reactor will be hydraulically designed so the majority of the volume of the liquid components having residual properties in the DFOM will exit the lower portion of the reactor, preferably over 75% vol. of the volume of the liquid components having residual properties in the DFOM will exit the lower portion of the reactor and even more preferably over 90% vol. of the volume of the liquid components having residual properties in the DFOM will exit the lower portion of the reactor. This is in contrast with the prior art reactive distillation processes where the majority of the desired products exit the upper portion of the reactor via distillation and the residual bottoms portions are recycled or sent to another refinery unit for further processing.
In a variation of the above illustrative embodiment, one or more fixed bed reactor(s) containing, solid particle filtering media such as inactive catalyst support, inert packing materials, selective absorption materials such as sulfur absorption media, demetallization catalyst or combinations and mixtures of these may be located upstream of the Reactive Distillation Pre-Treatment Unit. In one embodiment, the upstream reactors are loaded within inert packing materials and deactivated catalyst to remove solids followed by a reactor loaded within absorptive desulfurization materials. One of skill in the art will appreciate these upstream reactors may allow the upstream reactors to be taken out of service and catalysts changed out without shutting down or affecting operation of the Reactive Distillation Pre-Treatment Unit or the subsequent downstream Core Process.
In another variation of the above illustrative embodiment in
Divided Wall Pre-Treatment Unit:
In a further alternative embodiment, a divided wall reactor or distillation column configuration may be desired, especially when heat preservation is desired, such as when feed heater capabilities are limited or when it is economical to combine feed pre-treatment and product post-treatment in a single column.
Referring now to
As illustrate, DFOM (P) is provided into upper portion of the first treatment section (604) through conduit means (610). Top vapor from the first treatment section comprising gases and light and middle distillate hydrocarbons will be withdrawn from the upper portion of the first lower treatment section (602). Middle distillate hydrocarbons are condensed in the upper portion of the treatment system (602) and optionally may be removed via line (611) as medium to heavy distillate (i.e. diesel and gas oil) for use and processing outside the battery limits shown. A portion of the middle distillate hydrocarbons can be diverted and used as a reflux (not shown) if desired, the volume of that reflux may be minimal. The gases and light hydrocarbons collect at the top of the treatment system and exit the vessel via line (612) for later processing which may occur outside of the battery limits. As illustrated the later processing may comprise a heat exchanger (614) followed by a separator drum (616). The condensed hydrocarbon liquids can be used in part as a reflux to the treatment section via pump (618) and lines (617 & 619). Or in addition, the light hydrocarbon liquids (wild naphtha) can be withdrawn via line (620) and processed using conventional techniques outside of the battery limits shown. Any sour water accumulating in the reflux drum can be withdrawn via line (621). Vapors and lighter hydrocarbons will be removed via vent (622) and processed outside the battery limits. The bottoms portion of the first lower treatment section (604), comprising partially treated DFOM may be reboiled via the reboiler loop (623). The source of heat may be a fired heater or hot stream. Note that the reboiler loop may not be required for all applications. Side reboilers or side coolers/condensers may also be added to the divided wall pretreatment device.
The cross-hatched areas represent mass transfer elements such as dense packed transition metal catalyst beds (with or without inert materials such as glass beads); loose catalyst supported on trays, or packing. The packing, if used, may be structured catalyst beds or random packing catalyst beds with inert materials mixed with the transitions metal catalyst materials.
The partition may be made of any suitable material if there is substantially no mass transfer across the partition, however there may be some heat transfer across the partition. The column cross-sectional area need not be divided equally by the partition. The partition can have any suitable shape such as a vertical dividing plate or an internal cylindrical shell configuration. In the embodiment illustrated in
The partially treated DFOM fluid from the lower portion of the first lower treatment section (604) is pumped through conduit means (624) into the second lower treatment section (606) at a point above the partitioned section. Top vapor from the second treatment section comprising gases and light and middle distillate hydrocarbons are withdrawn from the upper portion of the second lower treatment section (604). Middle distillate hydrocarbons are condensed in the upper portion of the treatment system (602) and removed via line (611) as medium and heavy distillate hydrocarbons (G) (i.e. diesel and gas oil) for use and processing outside the battery limits shown. A bottoms portion of the second lower treatment section, comprising Feedstock HMFO (A) may be routed through reboiler loop (625). The source of heat may be a fired heater or hot stream. Note that the reboiler loop is not required for all applications. Side reboilers or condensers may also be added to the divided wall pretreatment device. A second portion of the bottoms portion from the second lower treatment section (606) is removed through line (628) for use as Feedstock HMFO (A) in the Core Process. It may desirable for there to be injection of make up or quenching Activating Gas in to the lower portions of the vessel. This may be achieved using Activating (or Stripping) Gas feedlines (630) and (632). One of skill in the art will appreciate that the properties of the DFOM sent to the first treatment section and the partially treated DFOM may be (but need not be) substantively the same (except for the levels of environmental contaminates such as sulfur).
At the design stage, different packing or combinations of trays, structured catalyst beds, and packing can be specified on each side of the partition to alter the fraction of the DFOM which flows on each side of the partition. Other products such as middle and heavy distillate hydrocarbons may be taken from the upper portion of the treatment system 602 preferably from above the partitioned section.
In one embodiment the dividing partition is extended to the bottom of the part of the divided column containing trays or packing, and the section of trays or packing above the partition is eliminated. Such an arrangement allows easy control of the reflux liquid on each side of the divided column with a control valve (not shown) external to the column. In the embodiments illustrated in
One of skill in the art will appreciate the thermal benefits to be derived from the above illustrative embodiment. For example, one can utilize the above arrangement to more efficiently process relatively small volume (i.e. 500-5000 Bbl) of DFOM that a refinery would otherwise have to clear/dispose of. The divided wall reactor allows for a single treatment vessel to function as two separate vessels and take advantage of the combined collection of the by-product gases and light hydrocarbons.
In another illustrative embodiment of a divided wall Pre-Treatment Unit is shown in
By utilizing a divided wall Pre-Treatment Unit as illustrated in
Because of the nature of the divided wall Pre-Treatment Unit, a different temperature profile may be maintained below the partition (608) for the DFMO (P) contained in partition section (604) and the Product HMFO (B) contained in section (606). Cutpoints of the DFMO and HMFO can be controlled independently. A distillate side draw product (611) may also be taken.
For the present disclosure, it one of skill in the art will appreciate that one or more of the above described pre-treatment processes may need to be carried out to produce a Feedstock HMFO. The selection of the pre-treatment process will by necessity depend upon the nature and characteristics of the DFOM. For example if the DFOM is a high sulfur and high metals containing vacuum residual material (such as Ural vacuum residue or a heavy Mayan vacuum residue) the simple blending with heavy gas oil or FCC slurry oil may be sufficient to reduce the viscosity and sulfur and metals content so the DFOM is transformed into a Feedstock HMFO. However, pre-treatment of incompatible blends of Marine Gas Oil and high sulfur HMFO may require heating and distillation of the DFOM. A third example of DFOM requiring pre-treatment maybe the contamination of high sulfur HMFO with phenol or cumene and styrene oligomers which may required counter-current extraction with a polar liquid followed by heating and distillation removal of the non-residual volatiles boiling below 400° F. (205° C.). The specific pre-treatment process for any given DFOM will need to be adjusted and tested via an informed iterative process of optimization to produce a Feedstock HMFO for the Core Process.
These examples will provide one skilled in the art with a more specific illustrative embodiment for conducting the process disclosed and claimed herein:
Overview:
The purpose of a pilot test run is to demonstrate that feedstock HMFO can be processed through a reactor loaded with commercially available catalysts at specified conditions to remove environmental contaminates, specifically sulfur and other contaminants from the HMFO to produce a product HMFO that is MARPOL compliant, that is production of a Low Sulfur Heavy Marine Fuel Oil (LS—HMFO) or Ultra-Low Sulfur Heavy Marine Fuel Oil (USL-HMFO).
Pilot Unit Set Up:
The pilot unit will be set up with two 434 cm3 reactors arranged in series to process the feedstock HMFO. The lead reactor will be loaded with a blend of a commercially available hydrodemetallization (HDM) catalyst and a commercially available hydro-transition (HDT) catalyst. One of skill in the art will appreciate that the HDT catalyst layer may be formed and optimized using a mixture of HDM and HDS catalysts combined with an inert material to achieve the desired intermediate/transition activity levels. The second reactor will be loaded with a blend of the commercially available hydro-transition (HDT) and a commercially available hydrodesulfurization (HDS). One can load the second reactor simply with a commercially hydrodesulfurization (HDS) catalyst. One of skill in the art will appreciate that the specific feed properties of the Feedstock HMFO may affect the proportion of HDM, HDT and HDS catalysts in the reactor system. A systematic process of testing different combinations with the same feed will yield the optimized catalyst combination for any feedstock and reaction conditions. For this example, the first reactor will be loaded with ⅔ hydrodemetallization catalyst and ⅓ hydro-transition catalyst. The second reactor will be loaded with all hydrodesulfurization catalyst. The catalysts in each reactor will be mixed with glass beads (approximately 50% by volume) to improve liquid distribution and better control reactor temperature. For this pilot test run, one should use these commercially available catalysts: HDM: Albemarle KFR 20 series or equivalent; HDT: Albemarle KFR 30 series or equivalent; HDS: Albemarle KFR 50 or KFR 70 or equivalent. Once set up of the pilot unit is complete, the catalyst can be activated by sulfiding the catalyst using dimethyldisulfide (DMDS) in a manner well known to one of skill in the art.
Pilot Unit Operation:
Upon completion of the activating step, the pilot unit will be ready to receive the feedstock HMFO and Activating Gas feed. For the present example, the Activating Gas can be technical grade or better hydrogen gas. The mixed Feedstock HMFO and Activating Gas will be provided to the pilot plant at rates and operating conditions as specified: Oil Feed Rate: 108.5 ml/h (space velocity=0.25/h); Hydrogen/Oil Ratio: 570 Nm3/m3 (3200 scf/bbl); Reactor Temperature: 372° C. (702° F.); Reactor Outlet Pressure: 13.8 MPa(g) (2000 psig).
One of skill in the art will know that the rates and conditions may be systematically adjusted and optimized depending upon feed properties to achieve the desired product requirements. The unit will be brought to a steady state for each condition and full samples taken so analytical tests can be completed. Material balance for each condition should be closed before moving to the next condition.
Expected impacts on the Feedstock HMFO properties are: Sulfur Content (wt %): Reduced by at least 80%; Metals Content (wt %): Reduced by at least 80%; MCR/Asphaltene Content (wt %): Reduced by at least 30%; Nitrogen Content (wt %): Reduced by at least 20%; C1-Naphtha Yield (wt %): Not over 3.0% and preferably not over 1.0%.
Process conditions in the Pilot Unit can be systematically adjusted as per Table 1 to assess the impact of process conditions and optimize the performance of the process for the specific catalyst and feedstock HMFO utilized.
In this way, the conditions of the pilot unit can be optimized to achieve less than 0.5% wt. sulfur product HMFO and preferably a 0.1% wt. sulfur product HMFO. Conditions for producing ULS-HMFO (i.e. 0.1% wt. sulfur product HMFO) will be: Feedstock HMFO Feed Rate: 65.1 ml/h (space velocity=0.15/h); Hydrogen/Oil Ratio: 620 Nm3/m3 (3480 scf/bbl); Reactor Temperature: 385° C. (725° F.); Reactor Outlet Pressure: 15 MPa(g) (2200 psig)
Table 2 summarizes the anticipated impacts on key properties of HMFO.
Table 3 lists analytical tests to be carried out for the characterization of the Feedstock HMFO and Product HMFO. The analytical tests include those required by ISO for the Feedstock HMFO and the product HMFO to qualify and trade in commerce as ISO compliant residual marine fuels. The additional parameters are provided so that one skilled in the art can understand and appreciate the effectiveness of the inventive process.
Table 4 contains the Feedstock HMFO analytical test results and the Product HMFO analytical test results expected from the inventive process that indicate the production of a LS HMFO. It will be noted by one of skill in the art that under the conditions, the levels of hydrocarbon cracking will be minimized to levels substantially lower than 10%, more preferably less than 5% and even more preferably less than 1% of the total mass balance.
(1)property will be adjusted to a higher value by post process removal of light material via distillation or stripping from product HMFO.
The product HMFO produced by the inventive process will reach ULS HMFO limits (i.e. 0.1% wt. sulfur product HMFO) by systematic variation of the process parameters, for example by a lower space velocity or by using a Feedstock HMFO with a lower initial sulfur content.
Pilot Unit Set Up:
A pilot unit was set up as noted above in Example 1 with these changes: the first reactor was loaded with: as the first (upper) layer encountered by the feedstock 70% vol Albemarle KFR 20 series hydrodemetallization catalyst and 30% vol Albemarle KFR 30 series hydro-transition catalyst as the second (lower) layer. The second reactor was loaded with 20% Albemarle KFR 30 series hydrotransition catalyst as the first (upper) layer and 80% vol hydrodesulfurization catalyst as the second (lower) layer. The catalyst was activated by sulfiding the catalyst with dimethyldisulfide (DMDS) in a manner well known to one of skill in the art.
Pilot Unit Operation:
Upon completion of the activating step, the pilot unit was ready to receive the feedstock HMFO and Activating Gas feed. The Activating Gas was technical grade or better hydrogen gas. The Feedstock HMFO was a commercially available and merchantable ISO 8217 compliant HMFO, except for a high sulfur content (2.9 wt %). The mixed Feedstock HMFO and Activating Gas was provided to the pilot plant at rates and conditions as specified in Table 5 below. The conditions were varied to optimize the level of sulfur in the product HMFO material.
Analytical data for a representative sample of the feedstock HMFO and representative samples of product HMFO are below:
In Table 6, both feedstock HMFO and product HMFO exhibited observed bulk properties consistent with ISO 8217 for a merchantable residual marine fuel oil, except that the sulfur content of the product HMFO was reduced as noted above when compared to the feedstock HMFO.
One of skill in the art will appreciate that the above product HMFO produced by the inventive process has achieved not only an ISO 8217 compliant LS HMFO (i.e. 0.5% wt. sulfur) but also an ISO 8217 compliant ULS HMFO limits (i.e. 0.1% wt. sulfur) product HMFO.
The feedstock to the pilot reactor utilized in example 2 above was changed to a commercially available and merchantable ISO 8217 RMK-500 compliant HMFO, except that it has high environmental contaminates (i.e. sulfur (3.3 wt %)). Other bulk characteristic of the RMK-500 feedstock high sulfur HMFO are provide below:
The mixed Feedstock (RMK-500) HMFO and Activating Gas was provided to the pilot plant at rates and conditions and the resulting sulfur levels achieved in the table below
The resulting product (RMK-500) HMFO exhibited observed bulk properties consistent with the feedstock (RMK-500) HMFO, except that the sulfur content was reduced as noted in the above table.
One of skill in the art will appreciate that the above product HMFO produced by the inventive process has achieved a LS HMFO (i.e. 0.5% wt. sulfur) product HMFO having bulk characteristics of an ISO 8217 compliant RMK-500 residual fuel oil. It will also be appreciated that the process can be successfully carried out under non-hydrocracking conditions (i.e. lower temperature and pressure) that substantially reduce the hydrocracking of the feedstock material. When conditions were increased to much higher pressure (Example E) a product with a lower sulfur content was achieved, however some observed there was an increase in light hydrocarbons and wild naphtha production.
It will be appreciated by those skilled in the art that changes could be made to the illustrative embodiments described above without departing from the broad inventive concepts thereof. It is understood, therefore, that the inventive concepts disclosed are not limited to the illustrative embodiments or examples disclosed, but it should cover modifications within the scope of the inventive concepts as defined by the claims.
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| Number | Date | Country | |
|---|---|---|---|
| 20200123458 A1 | Apr 2020 | US |
| Number | Date | Country | |
|---|---|---|---|
| 62589479 | Nov 2017 | US | |
| 62458002 | Feb 2017 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 16124884 | Sep 2018 | US |
| Child | 16719461 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/US2018/017863 | Feb 2018 | US |
| Child | 16124884 | US | |
| Parent | PCT/US2018/017855 | Feb 2018 | US |
| Child | PCT/US2018/017863 | US |
