Sleeve reactor of DMTO device

Abstract

The utility model relates to the technical field of DMTO devices, and discloses a DMTO device sleeve reactor which comprises an outer cylinder and an inner cylinder, the inner cylinder is arranged in the outer cylinder, the top of the inner cylinder is fixedly connected with a feed hopper, the top end of the feed hopper is connected with a bent pipe through a flange, one end of the bent pipe is connected with a three-way valve through a flange, and the other end of the bent pipe is connected with a valve. One end of the three-way valve is connected with a C4 connecting pipe through a flange, the middle end of the three-way valve is connected with a methanol connecting pipe, and one end of the C4 connecting pipe is connected with a delivery pump. The DMTO reaction byproduct C4 compound is collected, vaporized and then reacts with the molecular sieve catalyst, the induction period of converting methanol into ethylene and propylene can be eliminated in the process, coke generation is reduced, methanol unit consumption is reduced, the effect of saving methanol is achieved, meanwhile, the C4 compound can be converted into low-carbon olefin such as ethylene and propylene after reacting in the reactor, and the production cost is reduced. The olefin yield is increased, and the yields of ethylene and propylene are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of DMTO devices, in particular to a sleeve reactor of a DMTO device. Background Art

[0002] DMTO technology is a chemical process that converts dimethyl ether into light olefins. This technology has important applications in the modern chemical industry, enabling the production of important chemical raw materials and fuels from non-petroleum sources.

[0003] Due to the initial induction period of the DMTO reaction, methanol first forms active hydrocarbon pool species within the molecular sieve pores before proceeding to the next reaction. During this process, some methanol forms coke, increasing methanol consumption per unit and raising production costs. Furthermore, in addition to producing ethylene and propylene, DMTO technology also produces byproducts such as mixed C4. If these byproducts are not effectively utilized, they will not only reduce raw material utilization but may also have certain environmental impacts.

[0004] In view of this, we propose a DMTO device sleeve reactor to solve the above problems. Utility Model Content

[0005] (1) Technical problems solved

[0006] In response to the shortcomings of the existing technology, the utility model provides a sleeve reactor for a DMTO device, which has the advantages of utilizing mixed C4 and catalyst for reaction cracking to improve the yield of ethylene and propylene, eliminating the induction period of converting the raw material methanol into ethylene and propylene, reducing the formation of coke, and solving the above-mentioned technical problems.

[0007] (2) Technical solution

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a DMTO device sleeve reactor, comprising an outer tube and an inner tube, an inner tube is arranged inside the outer tube, and the top of the inner tube is fixedly connected to a feed hopper, the top of the feed hopper is connected to a bend pipe through a flange, one end of the bend pipe is connected to a three-way valve through a flange, one end of the three-way valve is connected to a C4 connecting pipe through a flange, and the middle end of the three-way valve is connected to a methanol connecting pipe, one end of the C4 connecting pipe is connected to a delivery pump, and the suction end of the delivery pump is connected to a C4 vaporizer, the outer surface of the inner tube is fixedly connected to a spiral cooling pipe, one end of the spiral cooling pipe is fixedly connected to a coolant inlet pipe, and the other end of the spiral cooling pipe is fixedly connected to a waste heat recovery pipe, one end of the waste heat recovery pipe is connected to a heating pipe, and a distribution plate is fixedly connected to the inner wall of the inner tube, and a distributor is plugged into the interior of the distribution plate.

[0009] Preferably, two catalyst beds are fixedly connected to the inner wall of the inner cylinder, and a molecular sieve is installed on the top of the catalyst bed.

[0010] Through the above technical solution, the catalyst bed is used to support the molecular sieve, which acts as a catalyst to undergo a dehydration reaction with methanol. The methanol molecules are adsorbed on the acidic sites of the catalyst. The catalyst causes the hydroxyl groups (-OH) in the methanol molecules to combine with the hydrogen atoms (-H) in the adjacent methanol molecules to form water molecules (H2O), thereby activating the methanol. The activated methanol molecules undergo a polymerization reaction through the breaking and recombination of the carbon-oxygen bonds to form olefins (mainly ethylene and propylene) and other by-products.

[0011] Preferably, the outer surface of the outer cylinder is fixedly connected to two manholes, and the ports of the manholes are connected to sealing doors via flanges.

[0012] With the above technical solution, when the molecular sieve loses its activity and cannot function as a catalyst, the sealed door on the manhole needs to be opened so that workers can enter the inner cylinder and replace the molecular sieve on the catalyst bed.

[0013] Preferably, a C4 inlet pipe is fixedly connected to the outer surface of the C4 vaporizer, and the output end of the delivery pump is connected to the C4 connecting pipe.

[0014] Through the above technical solution, since methanol can not only form olefins after the dehydration reaction with the molecular sieve, but also some by-products, these by-products include mixed C4 components, such as n-butane, isobutane, 1-butene, 2-butene, isobutene and other C4 compounds, these C4 compounds are collected and then transported to the C4 vaporizer through the C4 inlet pipe for vaporization, and then the vaporized C4 compounds are transported to the C4 connecting pipe through the delivery pump, and the C4 connecting pipe and the elbow are connected by operating the three-way valve, so that the vaporized C4 compounds will enter the feed hopper, and then After passing through the distributor and coming into contact with the molecular sieve for reaction, this reaction process can eliminate the induction period of methanol conversion into ethylene and propylene and reduce the formation of coke. The reduction in the amount of coke generated means that the ineffective consumption of methanol due to the formation of coke is reduced, thereby saving methanol to a certain extent and reducing the unit consumption of methanol. At the same time, the C4 compound reacts with the catalyst in the reactor and can undergo cracking and other reactions to be converted into low-carbon olefins such as ethylene and propylene, which is equivalent to increasing the output of olefins and improving the yield of ethylene and propylene, thereby improving the efficiency and economic benefits of the entire DMT process for producing olefins.

[0015] Preferably, a plurality of through holes are formed through the top surface of the distribution plate, and a distributor is inserted into the through holes. The top of the distributor is open and the bottom is closed. The outer surface of the distributor is provided with a plurality of outlet holes around its axial direction near the bottom end.

[0016] Through the above technical solution, a distribution plate is set up to support each distributor. When methanol or vaporized C4 compound enters the feed hopper, it will enter from the opening at the top of the distributor and then be discharged from several openings at its bottom. This can evenly disperse the methanol gas or vaporized C4 compound, avoid high-speed fluid raw materials entering the inner cylinder and directly impacting the molecular sieve and causing damage, and enable the raw materials to evenly contact the molecular sieve from top to bottom, so that the raw materials can fully react with the catalyst.

[0017] Preferably, the coolant inlet pipe penetrates the outer surface of the outer tube and is connected to the spiral cooling pipe. A base is provided at the bottom of the outer tube, and a thermocouple is installed on the outer surface of the outer tube.

[0018] Through the above technical solution, since a large amount of heat is released during the catalytic reaction between the C4 compound or methanol raw material and the molecular sieve, the temperature changes in the inner cylinder can be monitored in real time through the installed thermocouple. When the temperature in the inner cylinder is too high, cold liquid is connected through the coolant inlet pipe, and then the cold liquid enters the spiral cooling tube. Since the spiral cooling tube fits the inner cylinder, the inner cylinder can be dissipated and cooled, thereby controlling the temperature during the catalytic reaction. The provided base is used to support the entire reactor.

[0019] Preferably, the heating pipe is wound around the outer surface of the bent pipe, and a thermal insulation pipe is fixedly connected to the outer surface of the bent pipe.

[0020] Through the above technical solution, when the coolant in the spiral cooling tube contacts the inner tube for heat exchange, the temperature of the coolant rises, and the hot liquid is transported to the heating tube through the waste heat recovery tube. Since the heating tube is wrapped around the outer surface of the bent tube, the bent tube can be heated, and then the methanol raw material or C4 compound transported to the inside of the bent tube is heated. The heated raw material helps it to be in a relatively active state before contacting the molecular sieve after entering the inner tube, which is conducive to making the chemical bonds in the raw material molecules easier to break and recombine, thereby accelerating the reaction rate of methanol to olefins. The provision of the insulation tube can achieve a certain insulation effect.

[0021] Preferably, a discharge pipe is fixedly connected to the bottom of the inner cylinder.

[0022] Through the above technical solution, when a portion of the vaporized C4 is transported into the inner cylinder and reacts with the molecular sieve, the three-way valve can be operated again to close the C4 connecting pipe and connect the methanol connecting pipe and the elbow, so that methanol can be transported into the inner cylinder. Regardless of whether the C4 mixture or the methanol raw material reacts with the molecular sieve, olefins and their by-products will be formed and finally discharged through the discharge pipe.

[0023] Compared with the prior art, the present invention provides a sleeve reactor for a DMTO device, which has the following beneficial effects:

[0024] 1. The utility model collects C4 compounds which are by-products of the DMTO reaction, vaporizes them and reacts them with a molecular sieve catalyst. This process can eliminate the induction period of methanol conversion into ethylene and propylene, reduce coke formation, and lower methanol consumption per unit, thereby saving methanol. At the same time, the C4 compounds can be converted into low-carbon olefins such as ethylene and propylene during the reaction in the reactor, thereby increasing olefin production and improving the yield of ethylene and propylene, thereby improving the efficiency and economic benefits of the entire process for producing olefins, and achieving multiple effects from saving raw materials to increasing profits.

[0025] 2. The utility model is provided with components such as a spiral cooling pipe, a waste heat recovery pipe, and a heating pipe. During the reaction process, the coolant dissipates heat and cools the inner cylinder through the spiral cooling pipe. The coolant heated by heat exchange is transported to the heating pipe through the waste heat recovery pipe, which can heat the methanol raw material or C4 compound in the bent pipe, so that it is in an active state before entering the inner cylinder and contacting the molecular sieve, thereby accelerating the reaction rate. This not only realizes the effective recovery and utilization of the reaction waste heat, but also helps to improve the reaction effect, thereby achieving the purpose of energy saving and efficiency improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional schematic diagram of the structure of the utility model;

[0027] Figure 2 This is a three-dimensional schematic diagram of the distribution plate and distributor of the utility model structure;

[0028] Figure 3 This is a schematic cross-sectional view of the structure of the utility model;

[0029] Figure 4 This is a three-dimensional schematic diagram of the structural distributor of the utility model;

[0030] Figure 5 This is a cross-sectional schematic diagram of the structural elbow and other components of the utility model.

[0031] Among them: 1. Outer tube; 2. Inner tube; 3. Feed hopper; 4. Elbow; 5. Three-way valve; 6. C4 connecting pipe; 7. Delivery pump; 8. C4 vaporizer; 9. Spiral cooling pipe; 10. Coolant inlet pipe; 11. Waste heat recovery pipe; 12. Heating pipe; 13. Distribution plate; 14. Distributor; 141. Outlet hole; 15. Catalyst bed; 16. Molecular sieve; 17. Manhole; 18. C4 inlet pipe; 19. Base; 20. Thermocouple; 21. Insulation pipe; 22. Discharge pipe; 23. Methanol connecting pipe. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] See also Figure 1-Figure 5 A DMTO device sleeve reactor comprises an outer tube 1 and an inner tube 2. The inner tube 2 is arranged inside the outer tube 1, and the top of the inner tube 2 is fixedly connected to the feed hopper 3. The top of the feed hopper 3 is connected to the elbow 4 through a flange. One end of the elbow 4 is connected to the three-way valve 5 through a flange. One end of the three-way valve 5 is connected to the C4 connecting pipe 6 through a flange, and the middle end of the three-way valve 5 is connected to the methanol connecting pipe 23. One end of the C4 connecting pipe 6 is connected to a delivery pump 7, and the suction end of the delivery pump 7 is connected to a C4 vaporizer 8. The outer surface of the inner tube 2 is fixedly connected to a spiral cooling pipe 9, one end of the spiral cooling pipe 9 is fixedly connected to a coolant inlet pipe 10, and the other end of the spiral cooling pipe 9 is fixedly connected to a waste heat recovery pipe 11, one end of the waste heat recovery pipe 11 is connected to a heating pipe 12, and a distribution plate 13 is fixedly connected to the inner wall of the inner tube 2, and a distributor 14 is plugged into the interior of the distribution plate 13.

[0034] Specifically, two catalyst beds 15 are fixedly connected to the inner wall of the inner cylinder 2, and a molecular sieve 16 is installed on top of the catalyst bed 15. The advantage is that the catalyst bed 15 is used to support the molecular sieve 16, which acts as a catalyst in a dehydration reaction with methanol. Methanol molecules are adsorbed on the acidic sites of the catalyst. The catalyst causes the hydroxyl groups (-OH) in the methanol molecules to combine with the hydrogen atoms (-H) in adjacent methanol molecules to form water molecules (H2O), thereby activating the methanol. The activated methanol molecules undergo a polymerization reaction through the breaking and recombination of carbon-oxygen bonds, forming olefins (primarily ethylene and propylene) and other byproducts.

[0035] Specifically, two manholes 17 are fixedly connected to the outer surface of the outer cylinder 1. The ends of the manholes 17 are flanged with sealed doors. This has the advantage that, if the molecular sieve 16 loses its activity and ceases to function as a catalyst, the sealed doors on the manholes 17 need to be opened, allowing workers to enter the inner cylinder 2 and replace the molecular sieve 16 on the catalyst bed 15.

[0036] Specifically, the outer surface of the C4 vaporizer 8 is fixedly connected with a C4 inlet pipe 18, and the output end of the delivery pump 7 is connected to the C4 connecting pipe 6. The advantage is that, since methanol can not only form olefins after the dehydration reaction with the molecular sieve 16, but also some by-products, these by-products include mixed C4 components, such as n-butane, isobutane, 1-butene, 2-butene, isobutene and other C4 compounds, by collecting these C4 compounds, and then delivering them to the C4 vaporizer 8 through the C4 inlet pipe 18 for vaporization, and then delivering the vaporized C4 compounds to the C4 connecting pipe 6 through the delivery pump 7, and by operating the three-way valve 5 to connect the C4 connecting pipe 6 and the elbow 4, the vaporized C4 compounds will enter the feed hopper 3 and then be delivered to the feed hopper 3. After passing through the distributor 14, it contacts and reacts with the molecular sieve 16. This reaction process can eliminate the induction period of methanol conversion into ethylene and propylene, and reduce the formation of coke. The reduction in the amount of coke generated means that the ineffective consumption of methanol due to the formation of coke is reduced, thereby saving methanol to a certain extent and reducing the unit consumption of methanol; at the same time, the C4 compound reacts with the catalyst in the reactor and can undergo cracking and other reactions to be converted into low-carbon olefins such as ethylene and propylene, which is equivalent to increasing the output of olefins and improving the yield of ethylene and propylene, thereby improving the efficiency and economic benefits of the entire DMT process for producing olefins.

[0037] Specifically, the top surface of the distribution plate 13 is penetrated by a plurality of through holes, into which the distributor 14 is inserted. The top of the distributor 14 is open and the bottom is closed. The outer surface of the distributor 14 is provided with a plurality of outlet holes 141 around its axial direction near the bottom. The advantage is that by providing the distribution plate 13 to support each distributor 14, when methanol or vaporized C4 compound enters the feed hopper 3, it will enter from the opening at the top of the distributor 14 and then be discharged from the plurality of openings at the bottom thereof. This can evenly disperse the methanol gas or vaporized C4 compound, avoid high-speed fluid raw materials entering the inner cylinder 2 and directly impacting the molecular sieve 16 and causing damage, and can make the raw materials evenly contact with the molecular sieve 16 from top to bottom, so that the raw materials can fully react with the catalyst.

[0038] Specifically, the coolant inlet pipe 10 penetrates the outer surface of the outer cylinder 1 and is connected to the spiral cooling pipe 9. A base 19 is provided at the bottom of the outer cylinder 1, and a thermocouple 20 is installed on the outer surface of the outer cylinder 1. The advantage is that since a large amount of heat is released during the catalytic reaction between the C4 compound or methanol raw material and the molecular sieve 16, the installed thermocouple 20 can monitor the temperature changes in the inner cylinder 2 in real time. When the temperature in the inner cylinder 2 is too high, cold liquid is introduced through the coolant inlet pipe 10, and then the cold liquid enters the spiral cooling pipe 9. Since the spiral cooling pipe 9 is in close contact with the inner cylinder 2, it can dissipate heat and cool the inner cylinder 2, thereby controlling the temperature during the catalytic reaction. The provided base 19 is used to support the entire reactor.

[0039] Specifically, the heating tube 12 is wound around the outer surface of the elbow 4, and a heat preservation tube 21 is fixedly connected to the outer surface of the elbow 4. The advantage is that when the coolant in the spiral cooling tube 9 contacts the inner tube 2 for heat exchange, the coolant temperature rises, and the hot liquid is transported to the heating tube 12 through the waste heat recovery tube 11. Since the heating tube 12 is wound around the outer surface of the elbow 4, the elbow 4 can be heated, and then the methanol raw material or C4 compound transported to the interior of the elbow 4 is heated. The heated raw material helps it to be in a relatively active state before it contacts the molecular sieve 16 after entering the inner tube 2, which is conducive to making the chemical bonds in the raw material molecules easier to break and recombine, thereby accelerating the reaction rate of methanol to olefins. The provision of the heat preservation tube 21 can achieve a certain heat preservation effect.

[0040] Specifically, a discharge pipe 22 is fixedly connected to the bottom of the inner cylinder 2. Advantageously, after a portion of the vaporized C4 is transported into the inner cylinder 2 and reacts with the molecular sieve 16, the three-way valve 5 can be operated again to close the C4 connecting pipe 6 and connect the methanol connecting pipe 23 with the elbow 4. This allows methanol to be transported into the inner cylinder 2. Regardless of whether the C4 mixture or the methanol feedstock reacts with the molecular sieve 16, olefins and their byproducts are ultimately discharged through the discharge pipe 22.

[0041] During use, the C4 compound is first transported to the C4 inlet pipe 18 and enters the C4 vaporizer 8 for vaporization, and then the vaporized C4 compound is transported to the C4 connecting pipe 6 through the delivery pump 7, and the C4 connecting pipe 6 and the elbow 4 are connected by operating the three-way valve 5, so that the vaporized C4 compound will enter the feed hopper 3, and then pass through the distributor 14 to contact and react with the molecular sieve 16. This reaction process can eliminate the induction period of methanol conversion into ethylene and propylene, and reduce the formation of coke; when the C4 compound is exhausted as a raw material, the C4 connecting pipe 6 and the elbow 4 are closed by operating the three-way valve 5 to connect the methanol connecting pipe 23 and the elbow 4, and the methanol is transported to the inner cylinder 2 for reaction with the molecular sieve 16. During the catalytic reaction, the temperature change can be monitored by the thermocouple 20. When the temperature in the inner cylinder 2 is too high, the cooling liquid is connected to the cooling liquid inlet pipe 10, and then the cooling liquid enters the spiral cooling tube 9. Since the spiral cooling tube 9 fits the inner cylinder 2, the inner cylinder 2 can be cooled and dissipated. When the cooling liquid in the spiral cooling tube 9 contacts the inner cylinder 2 and exchanges heat, the cooling liquid temperature rises, and the hot liquid is transported to the heating tube 12 through the waste heat recovery tube 11. Since the heating tube 12 is wrapped around the outer surface of the elbow 4, the elbow 4 can be heated, and then the methanol raw material or C4 compound transported to the inside of the elbow 4 is heated. The olefins and their by-products formed after the reaction are finally discharged through the discharge pipe 22.

[0042] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sleeve reactor for a DMTO device, comprising an outer cylinder (1) and an inner cylinder (2), characterized in that: An inner cylinder (2) is provided inside the outer cylinder (1), and the top of the inner cylinder (2) is fixedly connected to a feed hopper (3), the top of the feed hopper (3) is connected to a bend pipe (4) via a flange, one end of the bend pipe (4) is connected to a three-way valve (5) via a flange, one end of the three-way valve (5) is connected to a carbon four connecting pipe (6) via a flange, and the middle end of the three-way valve (5) is connected to a methanol connecting pipe (23), one end of the carbon four connecting pipe (6) is connected to a delivery pump (7), and the delivery pump The suction end of (7) is connected to the C4 vaporizer (8), the outer surface of the inner tube (2) is fixedly connected to the spiral cooling tube (9), one end of the spiral cooling tube (9) is fixedly connected to the coolant inlet pipe (10), and the other end of the spiral cooling tube (9) is fixedly connected to the waste heat recovery pipe (11), one end of the waste heat recovery pipe (11) is connected to the heating pipe (12), the inner wall of the inner tube (2) is fixedly connected to the distribution plate (13), and the distributor (14) is plugged into the interior of the distribution plate (13).

2. The sleeve reactor of a DMTO device according to claim 1, characterized in that: Two catalyst beds (15) are fixedly connected to the inner wall of the inner cylinder (2), and a molecular sieve (16) is installed on the top of the catalyst bed (15).

3. The sleeve reactor of a DMTO device according to claim 1, characterized in that: Two manholes (17) are fixedly connected to the outer surface of the outer cylinder (1), and a sealing door is connected to the ends of the manholes (17) via a flange.

4. The sleeve reactor of a DMTO device according to claim 1, characterized in that: The outer surface of the C4 vaporizer (8) is fixedly connected to a C4 inlet pipe (18), and the output end of the delivery pump (7) is connected to a C4 connecting pipe (6).

5. The sleeve reactor of a DMTO device according to claim 1, characterized in that: The top surface of the distribution plate (13) is provided with a plurality of through holes, into which the distributor (14) is inserted. The top of the distributor (14) is open and the bottom is closed. The outer surface of the distributor (14) is provided with a plurality of outlet holes (141) around its axial direction near the bottom end.

6. The sleeve reactor of a DMTO device according to claim 1, characterized in that: The cooling liquid inlet pipe (10) penetrates the outer surface of the outer cylinder (1) and is connected to the spiral cooling pipe (9). A base (19) is provided at the bottom of the outer cylinder (1), and a thermocouple (20) is installed on the outer surface of the outer cylinder (1).

7. The sleeve reactor of a DMTO device according to claim 1, characterized in that: The heating pipe (12) is wound around the outer surface of the curved pipe (4), and a heat preservation pipe (21) is fixedly connected to the outer surface of the curved pipe (4).

8. The sleeve reactor of a DMTO device according to claim 1, characterized in that: A discharge pipe (22) is fixedly connected to the bottom of the inner cylinder (2).

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