The present invention relates to a device for mixing at least two particulate catalysts, and in particular, the device is particularly suitable for use in a reaction system for producing ethylene-propylene.
Lower olefins, namely ethylene and propylene, are two important basic chemical feedstocks, and the demand of the lower olefins is increasing continuously. In recent years, the process of Methanol to Olefins (MTO) has been greatly developed, and three technologies have been industrially applied, and many related patents exist.
CN102464534B and CN102372538A disclose zoned processes of MTOs, wherein methanol enters a lower pre-mixing zone or a catalyst mixing tube and an upper main reaction zone respectively for reaction.
In the process disclosed in CN102276398A, liquid methanol enters an initial contacting zone to exchange heat with a spent catalyst, and then goes upward to enter a main reaction zone to react to generate ethylene and propylene.
According to the scheme above, as the reaction conditions in the premixing area, the catalyst mixing tube and the initial contacting area are not suitable for methanol conversion, the carbon-based loss of methanol is caused, and the selectivity to the both olefins is low. In particular, in MTO processes, particulate catalysts are involved in deactivation (especially, for example, coking) and regeneration, while a certain extent of coking of the catalyst may be beneficial to the reaction. Thus, in an MTO process, it is desirable to rapidly mix a regenerated catalyst with a coked-deactivated catalyst in a certain ratio.
One of the technical problems to be solved by the present invention is to overcome the defect that a plurality of particulate catalysts are not easy to be quickly and uniformly mixed in the prior art, and is particularly suitable for an ethylene-propylene production process of an MTO process.
Based on research and improvement to the MTO process, the present invention provides a mixing device for mixing at least two particulate catalysts, comprising a riser for loading a first particulate catalyst and an outer casing vessel surrounding and being coaxial with the riser for loading a second particulate catalyst, the first and second particulate catalysts being different in structure and/or composition, and at least a part of the upper portion of the riser and at least a part of the upper portion of the outer casing vessel both being located inside a mixing zone vessel; wherein:
In a preferred embodiment, the first and second particulate catalysts are distributed such that the Peclet number of the mixed catalyst is less than 5, and the mean square error, σ, of the first particulate catalyst fraction is less than 3.0; or the Peclet number of the mixed catalyst is less than 1, and the mean square error, σ, of the first particulate catalyst fraction is less than 1.0.
In a preferred embodiment, the ratio by weight of the flow rates entering the mixing zone vessel, Rw, of the first particulate catalyst to the second particulate catalyst is 0.01< Rw ≤ 0.5, preferably 0.02 ≤ Rw ≤0.2.
In a preferred embodiment, the mixing device of the present invention may be used in a process for producing ethylene-propylene, wherein the outer casing vessel is a fast bed reactor; the mixing zone vessel is preferably a fast bed settler; and/or the riser outlet structural member and the fast bed outlet structural member are each preferably a fast separator.
In a preferred embodiment, the riser is externally provided with a heat-exchanging coiler or jacket, for removing or supplementing heat from/to the riser and/or outer casing vessel.
The present invention also provides a reaction system for producing ethylene-propylene, comprising: a fast bed reactor, a fast bed settler and a riser which are coaxially arranged; wherein
The present invention also provides a mixing device for mixing at least two particulate materials, comprising a riser for loading a first particle and an outer casing vessel surrounding and being coaxial with the riser for loading a second particle, the upper portion of the first riser extending beyond the top of the second riser, and at least a part of the upper portion of the first riser and at least a part of the second riser both being located inside a mixing zone vessel, such that the first and second particles are delivered through the first and second risers, respectively, to the interior of the mixing zone vessel and mixed.
Accordingly, the present invention also provides an exemplary process for producing ethylene-propylene, comprising:
In the present invention, the reaction products referred to in the various embodiments, including, for example, the reaction product I, the reaction product II, and additional reaction product, etc., as indicated, each represent a material obtained by a reaction intended to provide products of ethylene and propylene, and capable of providing products rich in ethylene and propylene by means of separation units known in the art, but the specific composition thereof may differ somewhat in the various embodiments due to variations in the starting materials, reaction conditions, etc., within the scope of the present invention.
In the technical solutions for producing ethylene-propylene by catalytic conversion of methanol, C4-C6 non-aromatic hydrocarbon and an aqueous solution of oxygenate are contacted and reacted with a regenerated catalyst in an outside riser reactor, and are converted into ethylene and propylene at high selectivity under the conditions of high temperature and high linear velocity, so that the generation of heavy hydrocarbon and phenol compounds is avoided.
Meanwhile, the regenerated catalyst obtained is fully mixed with the second particulate catalyst obtained by partial deactivation in a fast bed settler through a special fast separator structure and then is fed into the reaction zone of the fast bed reactor to participate in the MTO reaction, so that high selectivity to ethylene and propylene can be obtained.
According to an embodiment of the invention, using the SAPO-34 catalyst, the total yield, calculated as carbon, of the ethylene and propylene can reach 90.4 wt%, representing a desirable technical effect.
The present invention will be illustrated in detail in the embodiments referring to the drawings. It should be understood that the detailed description and specific Examples, while indicating the preferred embodiments of the invention, are given by way of illustration and explanation only, without limiting the present invention.
In the description of the present invention, it is to be understood that the orientation or position relationship indicated by terms “transverse” direction, “radial” direction, “circumferential” direction, “inner”, “outer” and the like refer to the orientation or position relationship in the drawings, which are provided for convenience of easy and simple description, but not to indicate or imply that a device or part so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limitation to the present invention.
In the present invention, a same reference sign generally denotes the same/corresponding object.
In the present invention, the pressure is gauge pressure unless otherwise specified.
As showed in
As shown in
In one embodiment, the riser 203 and the fast bed reactor 201 are coaxial with the fast bed settler 202, the fast bed reactor 201 surrounding the riser 203; the outlet of the riser 203 is connected with a riser outlet structural member 208 (such as a fast separator), and the top of the fast bed reactor 201 is connected with a fast bed outlet structural member 207 (such as a fast separator); the riser fast separator 208 and the fast bed fast separator 207 are both located within the fast bed settler 202. In one embodiment, the riser fast separator 208 is located above the fast bed fast separator 207. In one embodiment, the riser outlet structural member 208 (see
Accordingly, in the present invention, in view of the correspondence in
Still further, even if not specifically indicated or labeled in the drawings, it will be readily understood by those skilled in the art that the various devices/components discussed, referred to in the present invention and/or labeled in the drawings are generally applicable to the device for mixing at least two particulate catalysts shown in
For example, the structure of the riser fast separator 208 discussed herein and illustrated in
In one embodiment, the mixed catalyst outlet of the riser settler 206 is communicated with the feed inlet of the riser 203 and is communicated with the feed inlet of the stripper, the mixed catalyst outlet of the fast bed settler 202 is communicated with the feed inlet of the stripper and is communicated with the feed inlet of the outside heat-exchanger, the solid outlet of the stripper is communicated with the solid feed inlet of the regenerator, and the outlet of the heat-removed product of the outside heat-exchanger is communicated with the upper opening of the fast bed settler 202.
In one embodiment, the interior of the mixing zone vessel 202 is provided with an annular distributor surrounding and being coaxial with the upper portion of the outer casing vessel 201 for delivering upward a fluidizing gas (e.g., steam) into the interior of the mixing zone vessel 202 to act on the first and second particulate catalysts.
In the system of the invention, the aqueous solution of the oxygenate is contacted and reacted with the regenerated catalyst in the outside riser reactor 205, and is converted into lower hydrocarbons under the conditions of high temperature and high linear velocity, thereby avoiding generation of heavy hydrocarbons and phenol compounds. Meanwhile, the regenerated first catalyst obtained is delivered upward and fully mixed with the second particulate catalyst obtained by partial deactivation, and then is fed into the reaction zone of the fast bed reactor to be contacted and reacted with methanol, so that high selectivity to ethylene and propylene can be obtained.
In the present invention, cyclones, or any other device capable of performing a similar function (in particular, such as the separation of catalyst from product), may be provided in both the fast bed settler 202 and riser settler 206.
It is clearly understood by those skilled in the art that the mixing device of the present invention as shown in
In addition, it will be understood by those skilled in the art that the present invention also provides more broadly a mixing device for mixing at least two particulate materials, comprising a riser for loading a first particle and an outer casing vessel surrounding and being coaxial with the riser for loading a second particle, the upper portion of the first riser extending beyond the top of the second riser, and at least a portion of the upper portion of the first riser and at least a portion of the second riser both being located inside an upper vessel, such that the first and second particles are delivered through the first and second risers, respectively, to the interior of the upper vessel and mixed.
Referring to the illustrated embodiments of
According to an embodiment of the present invention, the fast bed fast separator 207 is of a branch pipe structure, preferably lower branch pipes 38, and preferably the lower branch pipes 38 are uniformly distributed.
According to an embodiment of the invention, the riser fast separator lower branch pipe 39 and the fast bed fast separator lower branch pipe 38 are distributed crosswise.
According to an embodiment of the present invention, the number, n, of the riser fast separator lower branch pipes 39 of the riser fast separator 208 is 2 to 8; and the included angle, β, between adjacent riser fast separator lower branch pipes 39 equals to 45-180 degrees.
This embodiment is shown, for example, in
According to an embodiment of the present invention, the number, m, of the fast bed fast separator lower branch pipes 38 of the fast bed fast separator 207 is 2 to 8; and the included angle, α, between adjacent fast bed fast separator lower branch pipes 38 equals to 45-180 degrees. This embodiment is shown, for example, in
According to an embodiment of the present invention, the distance from the center point of the fast bed fast separator 207 to the center point of the fast bed fast separator lower branch pipe 38 is less than or equal to the distance from the center point of the riser fast separator 208 to the riser fast separator lower branch pipe 39. More preferably, the ratio between the distance from the center point of the fast bed fast separator 207 to the center point of the fast bed fast separator lower branch pipe 38 and the distance from the center point of the riser fast separator 208 to the riser fast separator lower branch pipe 39 is 0.3-1:1.
According to an embodiment of the invention, the upper portion of the riser 203 extends beyond the top of the lifting zone 204 of the fast bed reactor, so that the riser outlet structural member 208 is located above the fast bed outlet structural member 207. Such embodiments may be referred to as “above-below arrangement” in the present invention, which are illustrated, for example, in
According to an embodiment of the present invention, the riser outlet structural member 208 is located inside the fast bed outlet structural member 207, such that the first particulate catalyst is premixed with the second particulate catalyst inside the fast bed outlet structural member 207. Such embodiments may be referred to as “inside arrangement” in the present invention, which are illustrated, for example, in
Similar to the previous discussion about the correspondence of the present invention, in the present invention, the mutual positional arrangement between the riser outlet structural member and the outer casing vessel outlet structural member (fast bed outlet structural member) is not limited to the discussion in each embodiment or the illustration in the corresponding figure(s), while the positional arrangement of the “above-below arrangement” or the “inside arrangement” may be independently selected as described above, unless the purpose of the present invention or the specific purpose of a corresponding embodiment is not satisfied.
Referring to
Referring to
Accordingly, referring to
By using the system of the present invention, the yield of propylene-ethylene is high.
Referring to
According to an embodiment of the invention, the stripper is an independent device. According to an embodiment of the invention, a part of the mixed catalyst and a part of the first particulate catalyst are fed into the same stripper.
It will be understood by those skilled in the art that in the present invention, the stripper primarily functions to remove catalyst-entrained impurities, such as entrained reaction oil and gas. Thus, according to an embodiment of the invention, the stripper can be replaced by any other device capable of performing the primary function, as long as it does not significantly damage the purpose of the invention.
It will be understood by those skilled in the art that in step b), the primary function of the outside heat-exchanger is to cool the mixed catalyst, to fit the needs of the reaction in the fast bed reactor. Thus, according to an embodiment of the invention, the outside heat-exchanger can be replaced by any other device capable of performing the primary function, as long as it does not significantly damage the purpose of the invention. Accordingly, the outside heat-exchanger may be replaced with an internal heat-exchanger.
The present invention does not set any special requirement on the light hydrocarbon feedstock, and a light hydrocarbon feedstock commonly used in the field can be used in the invention, and according to an embodiment of the invention, the light hydrocarbon feedstock is C4-C6 non-aromatic hydrocarbon mixture, and preferably, the light hydrocarbon feedstock at least comprises C4-C6 non-aromatic hydrocarbon mixture obtained from the separation unit.
According to an embodiment of the present invention, for the light hydrocarbon feedstock, a C4-C6 non-aromatic hydrocarbon mixture coming from the separation unit accounts for greater than 20 wt%, and the remaining of the C4-C6 non-aromatic hydrocarbon mixture comes from a catalytic cracking and/or steam cracking unit.
In the present invention, the composition of the C4-C6 non-aromatic hydrocarbon mixture may, for example, contain one or more of isobutene, 1-butene, n-butane, isobutane, isopentene, n-pentene, n-pentane, n-hexene, and isohexene.
In the present invention, the composition of the oxygenate feedstock is not particularly limited, and any mixture commonly used in the art comprising water and an oxygenate may be used in the present invention, and for the present invention, it is preferable that the oxygenate feedstock comprises oxygenate in an amount of 5 to 60 wt%, and water in an amount of 40 to 95 wt%.
In the present invention, the category of the oxygenate is widely selected, and according to an embodiment of the present invention, the oxygenate contains methanol and one or more of ethanol, propanol, butanol, acetaldehyde, propionaldehyde, butyraldehyde, acetone, butanone, formic acid, acetic acid, and propionic acid; preferably, the oxygenate comprise the aldehyde and/or ketone in an amount of 30 to 90 wt%.
According to one variation of the embodiment of the invention, the riser 203 is provided with an oxygenate or light hydrocarbon feed inlet, for reacting with the regenerated catalyst to obtain an additional reaction product comprising ethylene-propylene.
The type of the heat-removing medium 19 is not limited by the present invention, and any medium capable of providing heat, such as water, may be used. For illustration, the heat-removing medium used in Examples is water.
In the present invention, the operation conditions within the fast bed reactor 201 is not specially limited, and any operation conditions generally used in the art can be adopted. According to an embodiment of the present invention, the fast bed reactor 201 is operated at a catalyst temperature of 450 to 500° C., a gas linear velocity of 0.8 to 3 m/s, a reaction gauge pressure of 0.01 to 0.5 MPa, and a catalyst density of 50 to 250 kg/m3.
In the present invention, the mean square error, σ, of the first particulate catalyst fraction is calculated as follows:
wherein Cc denotes a percentage content of carbon on the catalyst at the lower branch pipe (38) of the fast bed fast separator based on the total weight of the catalyst; Cr denotes a percentage content of carbon on the first particulate catalyst based on the total weight of the catalyst; and Ci denotes a percentage content of carbon on the catalyst at any point in the fast bed settler (202) based on the total weight of the catalyst.
According to the invention, the purpose of the invention can be achieved by additionally arranging an outside riser reactor and operating according to the process of the invention, without special requirement on the operation conditions in the outside riser reactor 205, and for the invention preferably, in the outside riser reactor 205, the temperature of the catalyst is 530-650° C., the gas linear velocity is 1.1-15 m/s, and the catalyst density is 20-100 kg/m3.
According to a preferred embodiment of the invention, in step b): the weight ratio between the part of the mixed catalyst in the fast bed settler 202 fed into the stripper, the part of the mixed catalyst in the fast bed settler 202 returned to the reaction section of the fast bed reactor 201, and the part of the mixed catalyst in the fast bed settler 202 fed into the outside heat-exchanger is (0.5-1) :(5-7) : (2-4.5).
According to a preferred embodiment of the invention, in step d): the weight ratio of the part of the first particulate catalyst fed into the stripper to the part of the first particulate catalyst fed into the riser 203 is (1-3) : (7-9).
According to an embodiment of the invention, the weight ratio of the light hydrocarbon feedstock to the oxygenate feedstock is 1 : (0.5-3). The ethylene-propylene yield can be improved by the preferred embodiment described above.
According to the present invention, preferably, the catalyst is a molecular sieve catalyst.
According to the present invention, preferably, the molecular sieve catalyst is at least one of a SAPO-34 molecular sieve catalyst, a ZSM-5 molecular sieve catalyst and a β molecular sieve catalyst, more preferably a SAPO-34 molecular sieve catalyst. Using the preferred embodiment of the invention, the conversion and the yield of the lower olefin are improved.
According to an embodiment of the invention, the regenerated catalyst has a carbon content of less than 0.1% by weight, based on the total weight of the catalyst.
According to an embodiment of the invention, the first lifting medium is not specially limited and may be, for example, steam and/or the oxygenate feedstock and/or the light hydrocarbon feedstock.
According to an embodiment of the invention, the second lifting medium is not specially limited and may be, for example, the methanol feedstock from the process for producing ethylene-propylene.
The invention mainly modifies the structure and the operation procedures of the reaction system, and the rest operation conditions, processes and steps which are not particularly described can adopt the conventional processes, conditions and steps.
In the invention, the total yield of the ethylene and propylene, calculated as carbon,, is calculated by: (the total yield of the ethylene and propylene, calculated as carbon,) = (the weight of the ethylene and the propylene)/ (the weight of the methanol feed, calculated as carbon,) × 100%.
(the weight of the methanol feed, calculated as carbon,) = (the weight of the methanol feed) ∗ 14 / 32.
Thus, the present invention provides a number of embodiments of a first exemplary series, including:
1. A mixing device for mixing at least two particulate catalysts, comprising a riser 103 for loading a first particulate catalyst and an outer casing vessel 101 surrounding and being coaxial with the riser for loading a second particulate catalyst, the first and second particulate catalysts being different in structure and/or composition, and at least a part of the upper portion of the riser 103 and at least a part of the upper portion of the outer casing vessel 101 both being located inside a mixing zone vessel 102; wherein:
2. The mixing device according to embodiment 1 of the first exemplary series, wherein the first and second particulate catalysts are distributed such that the Peclet number of the mixed catalyst is less than 5, and the mean square error, σ, of the first particulate catalyst fraction is less than 3.0; or the Peclet number of the mixed catalyst is less than 1, and the mean square error, σ, of the first particulate catalyst fraction is less than 1.0.
3. The mixing device according to embodiment 1 of the first exemplary series, wherein the interior of the mixing zone vessel 202 is provided with an annular distributor surrounding and being coaxial with the upper portion of the outer casing vessel 201 for delivering a fluidizing gas (e.g., steam) upward into the interior of the mixing zone vessel 202 to act on the first and second particulate catalysts.
6. The mixing device according to embodiment 1 of the first exemplary series, wherein the ratio by weight of the flow rates entering the mixing zone vessel, Rw, of the first particulate catalyst to the second particulate catalyst is 0.01< Rw ≤ 0.5, preferably 0.02 ≤ Rw ≤0.2.
7. The mixing device according to embodiment 1 of the first exemplary series, wherein the outer casing vessel outlet structural member 107 is of a branch pipe structure; and/or the riser outlet structural member 108 is of a branch pipe structure or a flow guiding structure.
8. The mixing device according to embodiment 1 of the first exemplary series, wherein the upper portion of the riser 103 extends beyond the top of the outer casing vessel 101, so that the riser outlet structural member 108 is located above the outer casing vessel outlet structural member 107.
9. The mixing device according to embodiment 1 of the first exemplary series, wherein the riser outlet structural member 108 is located inside the outer casing vessel outlet structural member 107, such that the first particulate catalyst is premixed with the second particulate catalyst inside the outer casing vessel outlet structural member 107.
10. The mixing device according to embodiment 1 of the first exemplary series, which is used in a reaction system for producing ethylene-propylene, wherein:
11. The mixing device according to embodiment 10 of the first exemplary series, wherein the riser 103 is further provided with an oxygenate or light hydrocarbon feed inlet, for reaction with the regenerated first particle to obtain an additional reaction product comprising ethylene-propylene.
12. The mixing device according to embodiment 10 of the first exemplary series, wherein the riser 103 is externally provided with a heat-exchanging coiler or jacket, for removing or supplementing heat from/to the riser 103 and/or outer casing vessel 101.
13. A mixing device for mixing at least two particulate catalysts, having a first catalyst feeding equipment for loading a first particulate catalyst and a second catalyst feeding equipment for loading a second particulate catalyst, and a mixing zone vessel located above the first and second catalyst feeding equipment into which the first and second particulate catalysts are fed to mix to obtain a mixed catalyst; wherein:
14. A reaction system for producing ethylene-propylene, comprising: a fast bed reactor 201, a fast bed settler 202 and a riser 203 which are coaxially arranged; wherein
15. A mixing device for mixing at least two particulate materials, comprising a riser for loading a first particle and an outer casing vessel surrounding and being coaxial with the riser for loading a second particle, the upper portion of the first riser extending beyond the top of the second riser, and at least a part of the upper portion of the first riser and at least a part of the second riser both being located inside a mixing zone vessel, such that the first and second particles are delivered through the first and second risers, respectively, to the interior of the mixing zone vessel and mixed.
In addition, the present invention provides a number of embodiments of a second exemplary series, including:
1. A reaction system for producing ethylene-propylene, comprising: a fast bed reactor 201, a second dense bed I, a riser, outside heat-exchanger, a riser reactor, a second dense bed II, a stripper and a regenerator; wherein :
2. The reaction system according to embodiment 1 of the second exemplary series, wherein,
3. The reaction system according to embodiment 1 or 2 of the second exemplary series, wherein the ratio between the distance from the center point of the fast bed fast separator to the center point of the fast bed fast separator lower branch pipe and the distance from the center point of the riser fast separator to the riser fast separator lower branch pipe is (0.3-1):1.
4. The reaction system according to any one of embodiments 1-3 of the second exemplary series, wherein the riser outlet structural member is composed of a diffusion cone and a diffusion plate, the riser outlet is connected to the diffusion cone, and the diffusion cone is connected to the diffusion plate; the distance between the riser outlet and the top of the fast bed fast separator lower branch pipe is h1, the distance from the connection point of the diffusion cone and the diffusion plate to the top of the fast bed fast separator lower branch pipe is h3, the distance between the edge point of the diffusion plate and the top of the fast bed fast separator lower branch pipe is h2, and the distance between the top of the fast bed fast separator and the top of the fast bed fast separator lower branch pipe is H; the included angle between the diffusion cone and the vertical direction is γ, and the included angle between the diffusion plate and the horizontal direction is δ; ; the ratio of h1 to H is (0.05-0.3): 1, the ratio of h2 to H is (0.2-0.5): 1, and the ratio of h3 to H is (0.4-0.6): 1 ; h3 is greater than h2; γ is 10-60 degrees, and δ is 30-80 degrees.
5. A process for producing ethylene-propylene, the process being carried out in a reaction system according to any one of embodiments 1 to 4 of the second exemplary series, the process comprising:
6. The process according to embodiment 5 of the second exemplary series, wherein,
7. The process according to embodiment 5 or 6 of the second exemplary series, wherein,
8. The process according to any one of the embodiments 5-7 of the second exemplary series, wherein the weight ratio of the light hydrocarbon feedstock to the feedstock mixture is 1 : (0.5-3).
9. The process according to any one of embodiments 5-8 of the second exemplary series, wherein,
10. The process according to any one of embodiments 5-9 of the second exemplary series, wherein the riser lifting medium is steam and/or feedstock mixture and/or light hydrocarbon feedstock.
The invention is further illustrated by, but is not limited to, the following Examples. In the Examples, reference is primarily made to the embodiment of the mixing device of the present invention for use in an ethylene-propylene reaction system as illustrated in
The device shown in
Referring to
The ratio between the distance from the center point of the fast bed fast separator 207 to the center point of the fast bed fast separator lower branch pipe 38 and the distance from the center point of the riser fast separator 208 to the riser fast separator lower branch pipe 39 was 0.8:1.
The process comprised :
In step b): the weight ratio between the part of the mixed catalyst in the fast bed settler 202 fed into the stripper, the part of the mixed catalyst in the fast bed settler 202 returned to the fast bed reactor 201, and the part of the mixed catalyst in the fast bed settler 202 fed into the outside heat-exchanger was 0.8:6:3.2.
In step d): the weight ratio between the part of the first particulate catalyst fed into the stripper and the part of the first particulate catalyst fed into the riser 203 was 2:8.
The light hydrocarbon feedstock was C4-C6 non-aromatic hydrocarbon mixture obtained by the separation unit, comprising butylene in an amount of 60 wt%, pentene in an amount of 30 wt%, hexylene in an amount of 10 wt%; the oxygenate feedstock comprised oxides in a total amount of 50 wt%, wherein, the oxides comprised, by weight, methanol in an amount of 19%, ethanol in an amount of 5%, propanol in an amount of 3%, butanol in an amount of 2%, acetaldehyde in an amount of 8%, propionaldehyde in an amount of 2%, acetone in an amount of 40%, butanone in an amount of 20%, and formate in an amount of 1%.
The fast bed reactor 201 was operated at a catalyst temperature of 490° C., a gas linear velocity of 2 m/s, a reaction gauge pressure of 0.2 MPa, and a catalyst density of 70 kg/m3; and the outside riser reactor 205 was operated at a temperature of the catalyst of 600° C., a gas linear velocity of 5 m/s, and a catalyst density of 40 kg/m3.
The weight ratio of the light hydrocarbon feedstock to the oxygenate feedstock was 1:1.
The catalyst was SAPO-34 molecular sieve catalyst; and the regenerated catalyst 27 had a carbon content of 0.05% based on the total weight of the catalyst.
The first lifting medium was steam.
In the Example, the total yield, calculated as carbon, of ethylene and propylene was 90.4 wt%.
According to the process of Example 1, the device shown in
Among others, the ratio of h1 to H was 0.05:1, the ratio of h2 to H was 0.2:1, and the ratio of h3 to H was 0.4: 1; γ was 60 degrees, and δ was 30 degrees.
The light hydrocarbon feedstock comprised butylene in an amount of 30 wt%, butane in an amount of 20 wt%, pentene in an amount of 45 wt%, hexylene in an amount of 5 wt%; and the oxygenate feedstock comprised oxides in a total amount of 60 wt%, wherein the oxides comprised, by weight, methanol in an amount of 5%, ethanol in an amount of 3%, propanol in an amount of 2%, acetaldehyde 20%, acetone in an amount of 50%, and butanone in an amount of 20%.
The fast bed reactor 201 was operated at a catalyst temperature of 490° C., a gas linear velocity of 2 m/s, a reaction gauge pressure of 0.2 MPa, and a catalyst density of 70 kg/m3; and the outside riser reactor 205 was operated at a temperature of the catalyst of 600° C., a gas linear velocity of 5 m/s, and a catalyst density of 40 kg/m3.
The weight ratio of the light hydrocarbon feedstock to the oxygenate feedstock was 1:1.
The catalyst was SAPO-34 molecular sieve catalyst; and the regenerated catalyst 27 had a carbon content of 0.05% based on the total weight of the catalyst.
The first lifting medium was steam.
In the Example, the total yield, calculated as carbon, of ethylene and propylene was 89.3 wt%.
Lower olefins were produced according to the system and process of Example 2, except that δ was 80 °, γ was 10 °, the ratio of h1 to H was 0.3:1, the ratio of h2 to H was 0.5:1, and the ratio of h3 to H was0.6: 1; while the rest was the same as in Example 2.
In the Example, the total yield, calculated as carbon, of ethylene and propylene was 90.1 wt%.
Lower olefins were produced according to the system and process of Example 2, except that δ was 90°, γ was 70°, the ratio of h1 to H was 0.4:1, the ratio of h2 to H was 0.1:1, and the ratio of h3 to H was 0.3:1; while the rest was the same as in Example 2.
In the Example, the total yield, calculated as carbon, of ethylene and propylene was 86.3 wt%.
Lower olefins were produced according to the system and process of Example 1, except that the number, n, of the riser fast separator lower branch pipes 39 of the riser fast separator 208 was 8; and the included angle, β, between adjacent riser fast separator lower branch pipes 39 equaled to 45 degrees; the number, m, of the fast bed fast separator lower branch pipes 38 of the fast bed fast separator 207 was 8; and the included angle, α, between adjacent fast bed fast separator lower branch pipes 38 equaled to 45 degrees; and the riser fast separator lower branch pipe 39 and the fast bed fast separator lower branch pipe 38 were distributed crosswise.
The ratio between the distance from the center point of the fast bed fast separator 207 to the center point of the fast bed fast separator lower branch pipe 38 and the distance from the center point of the riser fast separator 208 to the riser fast separator lower branch pipe 39 was 1:1.
In the Example, the total yield, calculated as carbon, of ethylene and propylene was 90.2 wt%.
Lower olefins were produced according to the system and process of Example 1, except that the number, n, of the riser fast separator lower branch pipes 39 of the riser fast separator 208 was 10; and the included angle, β, between adjacent riser fast separator lower branch pipes 39 equaled to 18 degrees; the number, m, of the fast bed fast separator lower branch pipes 38 of the fast bed fast separator 207 was 10; and the included angle, α, between adjacent fast bed fast separator lower branch pipes 38 equaled to 18 degrees; and the riser fast separator lower branch pipe 39 and the fast bed fast separator lower branch pipe 38 were distributed crosswise.
The ratio between the distance from the center point of the fast bed fast separator 207 to the center point of the fast bed fast separator lower branch pipe 38 and the distance from the center point of the riser fast separator 208 to the riser fast separator lower branch pipe 39 was 1.5:1.
In the Example, the total yield, calculated as carbon, of ethylene and propylene was 88.7 wt%.
Lower olefins were produced according to the system and process of Example 1, except that the fast bed reactor 201 was operated at a catalyst temperature of 450° C., a gas linear velocity of 0.8 m/s, a reaction gauge pressure of 0.01 MPa, and a catalyst density of 250 kg/m3; and the outside riser reactor 205 was operated at a temperature of the catalyst of 530° C., a gas linear velocity of 1.1 m/s, and a catalyst density of 100 kg/m3.
In the Example, the total yield, calculated as carbon, of ethylene and propylene was 87.6 wt%.
Lower olefins were produced according to the system and process of Example 1, except that the fast bed reactor 201 was operated at a catalyst temperature of 500° C., a gas linear velocity of 3 m/s, a reaction gauge pressure of 0.5 MPa, and a catalyst density of 50 kg/m3; and the outside riser reactor 205 was operated at a temperature of the catalyst of 650° C., a gas linear velocity of 15 m/s, and a catalyst density of 20 kg/m3.
In the Example, the total yield, calculated as carbon, of ethylene and propylene was 89.1 wt%.
Lower olefins were produced according to the system and process of Example 1, except that the number, n, of the riser fast separator lower branch pipes 39 of the riser fast separator 208 was 1; the number, m, of the fast bed fast separator lower branch pipes 38 of the fast bed fast separator 207 was 1; and the fast bed fast separator lower branch pipe 38 and the riser fast separator lower branch pipe 39 were aligned in line.
In the Example, the total yield, calculated as carbon, of ethylene and propylene was only 84.1 wt%.
Example 1 was repeated, except that the outside riser reactor 205 and riser settler 206 were absent, and the regenerated catalyst 27 was fed directly into the fast bed reactor 201 to participate in the reaction.
In the Example, the total yield, calculated as carbon, of ethylene and propylene was only 82.4 wt%.
Lower olefins were produced according to the system and process of Example 1, except that the riser 203 and the fast separator configuration were absent, while the first particulate catalyst (stream 10) was fed directly into the fast bed reactor 201.
In the Example, the total yield, calculated as carbon, of ethylene and propylene was 85.2 wt%.
Example 2 was repeated, except that the outlet of the outside riser reactor 3 was connected directly with the fast bed settler 202.
In the Example, the total yield, calculated as carbon, of ethylene and propylene was only 83.3 wt%.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto.
Within the scope of the technical idea of the invention, numerous simple variants are possible, comprising the combination of the individual specific technical features in any suitable manner. The various potential combination manners of the present invention are not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should also be considered as disclosed in the present invention, and all such modifications and combinations are intended to be included within the scope of the present invention.
Number | Date | Country | Kind |
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202010968050.4 | Sep 2020 | CN | national |
Filing Document | Filing Date | Country | Kind |
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PCT/CN2021/118392 | 9/15/2021 | WO |