Patent Application
20230226484
The present invention relates generally to carbon processing, and more specifically, to scalable carbon processing systems.
In chemical manufacturing plants and downstream refinery processes, acidic gases, including H2S, are quite often removed from a mixture of flue gases with five- to 35-percent concentration using liquid amine absorption towers. Amines react with acidic gases to form a complex, which can be reversibly broken into starting amine and acidic gas at elevated temperatures. Similar amine-based processes are commonly used for the removal of other acid gases, such as nitrogen oxides (NOx), sulfur oxides (SOx), and carbon dioxide (CO2) with higher concentrations of industrial flue gases in manufacturing plants. Other chemical processes based on solid adsorbents, zeolites, and metal-organic frameworks (MOFs) are also commonly used for removing acidic flue gases with higher concentration in large-scale setups.
A carbon processing system comprises an air mover and a multi-stage reactor. The multi-stage reactor processes ambient air and generates carbon dioxide, as well as exhausted gas. The exhausted gas is released to ambient air. The carbon dioxide that is generated is usable in injection, sequestration, or in production of commodity carbon dioxide-derived materials, such as dry ice. The generated carbon dioxide is also usable in mobile refrigerants, industrial refrigerants, feedstock or starting material for the manufacture of useful chemicals including urea, methanol, formaldehyde, esters, ethers, hydrocarbons, polymers, plastics, and carbon monoxide. The carbon processing system uses a base solution that is regenerated during the novel process and reused during each carbon processing cycle. This provides for significant automation capabilities and scalability of the carbon processing system.
In one embodiment, the carbon processing system employs direct air-capture techniques. For example, the carbon processing system uses an air mover to provide air to the system for processing. The air mover comprises at least one of a compressor, a blower, a fan, a turbofan, a pump, a diaphragm pump, a Heating, Ventilation, and Air Conditioning (HVAC) system, an air contactor, a cooling tower, a falling-film evaporator, or an absorber. The multi-stage reactor involves a single container or two or more containers that provide the multi-stage functionality.
The multi-stage reactor includes a base solution. The base solution is water (H2O) containing a dissolved salt of the form a[Q+]b[X−]. The symbol “Q” in this general equation is the cation species, and in one example, is a quaternary ammonium cation taken from the group consisting of NH4+, N(CH3)4+, N(ethyl)4+, N(Butyl)4+, and N(Propyl)4+, or is a cation taken from the group consisting of K+, Na+, Ca2+, and Mg2+. The symbol “X” in this general equation is the anion species, and in one example, is taken from the group consisting of OH−, O2−, CO32−, HCO3−, Cl−, Br−, and I−. The symbols “a” and “b” in this general equation are integers such that the total charge of the water containing the dissolved salt is neutral.
In other embodiments, the base solution includes corrosion inhibitors, additives, or promoters. The corrosion inhibitors include vanadium pentoxide or other metallic oxides, and the additives or promoters include MEA (monoethanolamine), DEA (diethanolamine), TEA (triethanolamine), MDEA (methyl diethanolamine), piperazine, glycine, or any material that lowers an activation energy. In yet another embodiment, the base solution includes a phase transfer catalyst or agent with the structure of the form c[M+]d[Y−] that reduces interfacial surface tension and promotes mixing in gas-liquid or gas-liquid-solid systems. The symbol “M” in this general equation is the cation species. The symbol “Y” in this general equation is the anion species. The symbols “c” and “d” in this general equation are integers such that the total charge is neutral.
In operation, air contacts the base solution via the air mover. The air reacts with the base solution thereby generating a base solution having carbon dioxide and generating exhaust. This first stage is an absorption reaction. Next, the exhaust is released from the reactor. Released exhaust has less carbon dioxide than the air that contacts the base solution.
Next, heat is applied to the base solution having carbon dioxide thereby generating carbon dioxide and generating a base solution without carbon dioxide. This second stage is a desorption reaction. The base solution without carbon dioxide generated after applying heat is reusable in processing new air. The absorption reaction and desorption reaction are reversible reactions resulting in regeneration of the base solution into its form prior to contact with the air. The carbon processing system is highly scalable and consumes less processing volume than is required by many conventional carbon processing techniques.
Further details and embodiments and methods are described in the detailed description below. This summary does not purport to define the invention. The invention is defined by the claims.
The accompanying drawings, where like numerals indicate like components, illustrate embodiments of the invention.
Reference will now be made in detail to some embodiments of the invention, examples of which are illustrated in the accompanying drawings.
The multi-stage reactor 12 includes a base solution 13. The base solution is water (H2O) containing a dissolved salt of the form a[Q+]b[X−]. The symbol “Q” in this general equation is the cation species, and in one example, is a quaternary ammonium cation taken from the group consisting of NH4+, N(CH3)4+, N(ethyl)4+, N(Butyl)4+, and N(Propyl)4+, or is a cation taken from the group consisting of K+, Na+, Ca2+, and Mg2+. The symbol “X” in this general equation is the anion species, and in one example, is taken from the group consisting of OH−, O2−, CO32−, HCO3−, Cl−, Br−, and I−. The symbols “a” and “b” in this general equation are integers such that the total charge of the water containing the dissolved salt is neutral.
In another embodiment, the base solution 13 includes corrosion inhibitors, additives, or promoters. The corrosion inhibitors include vanadium pentoxide or other metallic oxides, and the additives or promoters include MEA (monoethanolamine), DEA (diethanolamine), TEA (triethanolamine), MDEA (methyl diethanolamine), piperazine, glycine, or any material that lowers an activation energy. In another embodiment, the base solution 13 includes a phase transfer catalyst or agent with the structure of the form c[M+]d[Y−] that reduces interfacial surface tension and promotes mixing in gas-liquid or gas-liquid-solid systems. The symbol “M” in this general equation is the cation species. The symbol “Y” in this general equation is the anion species. The symbols “c” and “d” in this general equation are integers such that the total charge is neutral.
In operation, air 14 contacts the base solution 13 via the air mover 11. The air 14 reacts with the base solution 13 thereby generating a base solution having carbon dioxide 15 (see
Next, the exhaust 16 is released from the reactor 12. The exhaust 16 released has less carbon dioxide than the air that contacts the base solution. The exhaust 16 is carbon dioxide stripped air.
Next, heat 17 is applied to the base solution having carbon dioxide 15 thereby generating carbon dioxide 18 and generating a base solution without carbon dioxide 13. This second stage is a desorption reaction. Heat 17 increases a temperature of the base solution having carbon dioxide 15 to less than 200 degrees Celsius. In one embodiment, the temperature of the base solution having carbon dioxide 15 is increased to at least 120° C. The base solution without carbon dioxide 13 generated after applying heat 17 is reusable in processing new air 14.
In accordance with at least one novel aspect, the absorption reaction and desorption reaction are reversible reactions resulting in regeneration of the base solution 13 into its form prior to contact with the air. By employing this novel technique, the carbon processing system 10 is highly scalable and consumes less processing volume than is required by many conventional carbon processing techniques.
In the example shown
In another embodiment, the base solution includes corrosion inhibitors, additives, or promoters. The corrosion inhibitors include vanadium pentoxide or other metallic oxides, and the additives or promoters include MEA (monoethanolamine), DEA (diethanolamine), TEA (triethanolamine), MDEA (methyl diethanolamine), piperazine, glycine, or any material that lowers an activation energy. In another embodiment, the base solution includes a phase transfer catalyst or agent with the structure of the form c[M+]d[Y−] that reduces interfacial surface tension and promotes mixing in gas-liquid or gas-liquid-solid systems. The symbol “M” in this general equation is the cation species. The symbol “Y” in this general equation is the anion species. The symbols “c” and “d” in this general equation are integers such that the total charge is neutral.
In operation, air 214 contacts the base solution within the first container 211 via the air mover 210 and an air displacer 222. In the example shown in
Next, the exhaust 216 is released from the first container 211. The exhaust 216 released has less carbon dioxide than the air that contacts the base solution. The exhaust 216 is carbon dioxide-depleted air.
Next, heat 217 is applied to the base solution having carbon dioxide 215 in second container 212 thereby generating carbon dioxide 218 and generating a base solution without carbon dioxide 213. This second stage is a desorption reaction. Heat 217 increases a temperature of the base solution having carbon dioxide 215 to less than 200 degrees Celsius. In one embodiment, the temperature of the base solution having carbon dioxide 215 is increased to at least 120° C. The base solution without carbon dioxide 213 generated after applying heat 217 is reusable in processing new air 214.
In accordance with at least one novel aspect, the absorption reaction and desorption reaction are reversible reactions resulting in regeneration of the base solution 213 into its form prior to contact with the air. By employing this novel technique, the carbon processing system 200 is highly scalable and consumes less processing volume as is required by many conventional carbon processing techniques.
In a second step (step 402), heat is applied to the base solution producing carbon dioxide and regenerating the base solution into its form prior to contact with the air. In a third step (step 403), carbon dioxide is separated from the base solution and used in any desired carbon application.
Various specific embodiments of the novel carbon processing systems and techniques are discussed below. It is appreciated that other embodiments exist that are within the scope of the claims.
One kg-mole of Q+X− (Q+ is 2K+ or 2Na+ and X− is CO32− or 20111 base was mixed with water to make an aqueous solution with a concentration anywhere between 1%-110% by weight, more specifically between 20-80% by wt, and more precisely between 40-60% by weight. 0.1-5 wt % of a phase transfer catalyst of the general formula of M+ Y− was added into the solution. One Kg-mole of pure CO2 (95-99-99.9% purity) was brought in contact with the aqueous solution in an autoclave under stirring at a temperature between 5° C. and 200° C., more specifically between 10° C. to 110° C., and more precisely between 10° C. to 80° C. When most of the CO2 was absorbed by the solution, the overhead pressure was released. The steam-jacketed autoclave was then heated to between 80 and 200° C., more specifically between 100-160° C., and more precisely between 110-150° C. to desorb CO2. The autoclave was then cooled down to room temperature and the overhead pure CO2 was bottled for injection. The conversion was around 75-99% and the selectivity was around 99%.
One kg-mole of Q+X− (Q+is 2K+ or 2Na+ and X− is CO32− or 2OH−) base was mixed with water to make an aqueous solution with a concentration anywhere between 1%-110% by weight, more specifically between 20-80% by wt, and more precisely between 40-60% by weight. 0.1-5 wt % of a phase transfer catalyst of the general formula of M+Y− was added into the solution. One Kg-mole of pure CO2 (95-99-99.9% purity) was brought in contact with the aqueous solution in an autoclave under stirring at a temperature between 5° C. and 200° C., more specifically between 10° C. to 110° C., and more precisely between 10° C. to 80° C. When most of the CO2 was absorbed by the solution, the overhead pressure was released. The steam-jacketed autoclave was then heated to between 80 and 200° C., more specifically between 100-160° C., and more precisely between 110-150° C. to desorb CO2. The autoclave was then cooled down to room temperature and the overhead pure CO2 was bottled for injection. The conversion was around 75-99% and the selectivity was around 99%.
One kg-mole of Q+X− (Q+ is N(CH3)4+ and X− is OH) base was mixed with water to make an aqueous solution with a concentration anywhere between 1%-110% by weight, more specifically between 10-80% by wt, and more precisely between 25-60% by weight. 0.1-5 wt % of a phase transfer catalyst of the general formula of M+Y− was added into the solution. One Kg-mole of pure CO2 (95-99-99.9% purity) was brought in contact with the aqueous solution in an autoclave at a temperature between 0° C. and 120° C., more specifically between 5° C. to 75° C., and more precisely between 10° C. to 55° C. When most of the CO2 was absorbed by the solution, the overhead pressure was released. The steam-jacketed autoclave was then heated to between 50 and 110° C., more specifically between 60-80° C., and more precisely between 65-75° C. to desorb CO2. The autoclave was then cooled down to room temperature and the overhead pure CO2 was bottled for injection. The conversion was around 85-99% and the selectivity was around 98%.
Embodiment #1 was run with Air (approximately 400 ppm CO2) bubbling through liquid solution and resulted in 75-80% conversion of CO2 in the feed gas (Air) with 99% selectivity.
Embodiment #2 was run with Air (approximately 400 ppm CO2) bubbling through liquid solution and resulted in 75-90% conversion of CO2 in the feed gas (Air) with 98% selectivity.
One kg-mole of Q+X− (Q+ is NH4+ and X− is OH−) base was mixed with water to make an aqueous solution with a concentration anywhere between 1%-110% by weight, more specifically between 20-80% by wt, and more precisely between 35-60% by weight. One Kg-mole of pure CO2 (95-99-99.9% purity) was brought in contact with the aqueous solution in an autoclave at a temperature between 0° C. and 120° C., more specifically between 10° C. to 55° C., and more precisely between 15° C. to 45° C. When most of the CO2 was absorbed by the solution, the overhead pressure was released. The steam-jacketed autoclave was then heated to between 50 and 200° C., more specifically between 55-110° C., and more precisely between 60-105° C. to desorb CO2. The autoclave was then cooled down to room temperature, the overhead gas mixture was bubbled through water, and purified CO2 was bottled for injection. The conversion was around 65-99% and the selectivity was around 97%.
One kg-mole of Q+X− (Q+ is N(Butyl)4+ and X− is OH−) base was mixed with water to make an aqueous solution with a concentration anywhere between 1%-110% by weight, more specifically between 10-80% by wt, and more precisely between 25-60% by weight. One Kg-mole of pure CO2 (95-99-99.9% purity) was brought in contact with the aqueous solution in an autoclave at a temperature between 0° C. and 120° C., more specifically between 5° C. to 85° C., and more precisely between 10° C. to 65° C. When most of the CO2 was absorbed by the solution, the overhead pressure was released. The steam-jacketed autoclave was then heated to between 50 and 180° C., more specifically between 60-150° C., and more precisely between 65-125° C. to desorb CO2. The autoclave was then cooled down to room temperature and the overhead pure CO2 was bottled for injection. The conversion was around 83-97% and the selectivity was around 98%.
Step 1: One kg-mole of Q+X− (Q+ is K+ or Na+ and X− is OH−) base was mixed with water to make an aqueous solution with a concentration anywhere between 1%-110% by weight, more specifically between 20-80% by wt, and more precisely between 40-60% by weight. 0.1-5 wt % of a phase transfer catalyst of the general formula of M+Y− was added into the solution. One Kg-mole of pure CO2 (95-99-99.9% purity) was brought in contact with the aqueous solution in an autoclave under stirring at a temperature between 5° C. and 200° C., more specifically between 10° C. to 110° C., and more precisely between 10° C. to 80° C. When most of the CO2 was absorbed by the solution, the overhead pressure was released. The solution was analyzed for carbonates.
Step 2: The autoclave was then recharged with another Kg-mole of pure CO2 (93-99-99.9% purity), and was brought in contact with the aqueous solution in an autoclave under stirring at a temperature between 5° C. and 200° C., more specifically between 10° C. to 110° C., and more precisely between 10° C. to 80° C. When most of the CO2 was absorbed by the solution, the overhead pressure was released. The solution was analyzed for bicarbonate.
Step 3: The steam-jacketed autoclave was then heated to between 80 and 200° C., more specifically between 100-160° C., and more precisely between 110-150° C. to desorb CO2. The autoclave was then cooled down to room temperature and the overhead pure CO2 was bottled for injection. The conversion was around 75-99% and the selectivity was around 99%. The total output for CO2 was almost twice the Kg-mole of starting Q+X−.
Embodiment #9 was run exactly the same way as Embodiment #8, except Air was bubbled through for the entirety of the first two stages of transformation. Conversion was around 75-99% and the selectivity was around 99%. The total output for CO2 was almost twice the Kg-mole of starting Q+X−.
Step 1: One kg-mole of Q+X− (Q+ is K+ or Na+ and X− is OH−) base was mixed with water to make an aqueous solution with a concentration anywhere between 1%-110% by weight, more specifically between 20-80% by wt, and more precisely between 40-60% by weight. 0.1-5 wt % of a phase transfer catalyst of the general formula of M+Y− was added into the solution. One Kg-mole of pure CO2 (95-99-99.9% purity) was brought in contact with the aqueous solution in an autoclave under stirring at a temperature between 5° C. and 200° C., more specifically between 10° C. to 110° C., and more precisely between 10° C. to 80° C. When most of the CO2 was absorbed by the solution, the overhead pressure was released. The solution was analyzed for carbonates.
Step 2: The autoclave was then recharged with another Kg-mole of pure CO2 (93-99-99.9% purity), and was brought in contact with the aqueous solution in an autoclave under stirring at a temperature between 5° C. and 200° C., more specifically between 10° C. to 110° C., more precisely between 10° C. to 80° C. When most of the CO2 was absorbed by the solution, the overhead pressure was released. The solution was analyzed for bicarbonate.
Step 3: The steam-jacketed autoclave was then heated to between 80 and 200° C., more specifically between 100-160° C., and more precisely between 110-150° C. to desorb CO2. The autoclave was then cooled down to room temperature and the overhead pure CO2 was bottled for injection. The conversion was around 75-99% and the selectivity was around 99%. The total output for CO2 was almost twice the Kg-mole of starting Q+X−.
Embodiment #11 was run exactly as Embodiment #10, except Air was bubbled through for the entirety of the first two stages of transformation. Conversion was around 75-99% and the selectivity was around 99%. The total output for CO2 was almost twice the Kg-mole of starting Q+X−.
One kg-mole of Q+X− (Q+ is 2K+ or 2Na+ and X− is CO32 or OH−) base was mixed with water to make an aqueous solution with a concentration anywhere between 1%-110% by weight, more specifically between 20-80% by wt, and more precisely between 40-60% by weight. 0.1-5 wt % of a phase transfer catalyst of the general formula of M+Y− was added into the solution. Also added was 0.5-1 wt % of any activation promoters & additives such as MEA, TEA, DEA, MDEA, piperazine, 1-glycine was used to lower the activation energy. One Kg-mole of pure CO2 (95-99-99.9% purity) was brought in contact with the aqueous solution in an autoclave under stirring at a temperature between 5° C. and 200° C., more specifically between 10° C. to 110° C., and more precisely between 10° C. to 80° C. When most of the CO2 was absorbed by the solution, the overhead pressure was released. The steam-jacketed autoclave was then heated to between 80 and 200° C., more specifically between 100-160° C., and more precisely between 110-150° C. to desorb CO2. The autoclave was then cooled down to room temperature and the overhead pure CO2 was bottled for injection. The conversion was around 75-99% and the selectivity was around 99%.
Embodiment #13 operated similarly to embodiment #12 but with Air. Conversion was around 65-99% and the selectivity was around 99%. The total output for CO2 was almost twice the Kg-mole of starting Q+X−.
One kg-mole of Q+X− (Q+ is 2K+ or 2Na+ and X− is CO32− or OH−) base was mixed with water to make an aqueous solution with a concentration anywhere between 1%-110% by weight, more specifically between 20-80% by wt, and more precisely between 40-60% by weight. 0.1-5 wt % of a phase transfer catalyst of the general formula of M+Y− was added into the solution. Also added was 0.5-20 wt % of activation promoters and additives such as MEA, TEA, DEA, MDEA to get higher CO2 capture kinetics. One Kg-mole of pure CO2 (95-99-99.9% purity) was brought in contact with the aqueous solution in an autoclave under stirring at a temperature between 5° C. and 200° C., more specifically between 10° C. to 110° C., and more precisely between 10° C. to 80° C. When most of the CO2 was absorbed by the solution, the overhead pressure was released. The steam-jacketed autoclave was then heated to between 80 and 200° C., more specifically between 100-160° C., and more precisely between 110-150° C. to desorb CO2. The autoclave was then cooled down to room temperature and the overhead pure CO2 was bottled for injection. The conversion was around 95-99% and the selectivity was around 99%.
Embodiment #15 operated similarly to Embodiment #14 but with Air. Conversion was around 95-99% and the selectivity was around 99%.
One kg-mole of Q+X− (Q+ is 2K+ or 2Na+ and X− is CO32− or OH−) base was mixed with water to make an aqueous solution with a concentration anywhere between 1%-110% by weight, more specifically between 20-80% by wt, and more precisely between 40-60% by weight. 0.1-5 wt % of a phase transfer catalyst of the general formula of M+Y− was added into the solution. 1 wt % of V2O5 was added as a corrosion inhibitor to control the Redox Potential of the solution so that iron oxides are preferentially stabilized rather than iron carbonates. One Kg-mole of pure CO2 (95-99-99.9% purity) was brought in contact with the aqueous solution in an autoclave under stirring at a temperature between 5° C. and 200° C., more specifically between 10° C. to 110° C., and more precisely between 10° C. to 80° C. When most of the CO2 was absorbed by the solution, the overhead pressure was released. The steam-jacketed autoclave is then heated to between 80 and 200° C., more specifically between 100-160° C., more precisely between 110-150° C. to desorb CO2. The autoclave was cooled down to room temperature and the overhead pure CO2 was bottled for injection. The conversion was around 75-99% and the selectivity was around 99%.
Embodiment #17 operated similarly to Embodiment #16 but with Air. Conversion was around 95-99% and the selectivity was around 99%.
One kg-mole of Q+X− (Q+ is 2K+ or 2Na+ and X− is CO32− or OH−) base was mixed with water to make an aqueous solution with a concentration anywhere between 1%-110% by weight, more specifically between 20-80% by wt, and more precisely between 40-60% by weight. 0.1-5 wt % of a phase transfer catalyst of the general formula of M+Y− was added into the solution. 1 wt % of V2O5 was added as a corrosion inhibitor to control the Redox Potential of the solution so that iron oxides are preferentially stabilized rather than iron carbonates. One Kg-mole of pure CO2 (95-99-99.9% purity) was brought in contact with the aqueous solution in an autoclave under stirring at a temperature between 5° C. and 200° C., more specifically between 10° C. to 110° C., and more precisely between 10° C. to 80° C. When most of the CO2 was absorbed by the solution, the overhead pressure was released. The steam-jacketed autoclave was then heated to between 80 and 200° C., more specifically between 100-160° C., and more precisely between 110-150° C. to desorb CO2. The autoclave was cooled down to room temperature and the overhead pure CO2 was bottled for injection. The conversion was around 75-99% and the selectivity was around 99%. The CO2 was further purified by passing it through a Y-Zeolite column and an amine absorber for the usage as a mobile and industrial refrigerant in supercritical CO2 state.
Embodiment #19 operated similarly to Embodiment #18 but with air. Conversion was around 75-99% and the selectivity was around 99%.
Although certain specific embodiments are described above for instructional purposes, the teachings of this patent document have general applicability and are not limited to the specific embodiments described above. Accordingly, various modifications, adaptations, and combinations of various features of the described embodiments can be practiced without departing from the scope of the invention as set forth in the claims.
This application claims the benefit under 35 U.S.C. § 120 from U.S. Nonprovisional patent application Ser. No. 17/948,492, entitled “Fully Automated Direct Air Capture Carbon Dioxide Processing System,” filed on Sep. 20, 2022. U.S. Nonprovisional patent application Ser. No. 17/948,492 in turn claims the benefit under 35 U.S.C. § 119 from U.S. Provisional Patent Application Ser. No. 63/295,942, entitled “Fully Automated Direct Air Capture Carbon Dioxide Processing System,” filed on Jan. 2, 2022. The subject matter of each of the foregoing references is expressly incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| 63295942 | Jan 2022 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 17948492 | Sep 2022 | US |
| Child | 18117633 | US |
