CN219209888U - Solution polymerization reactor - Google Patents
Solution polymerization reactor Download PDFInfo
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- CN219209888U CN219209888U CN202223494592.6U CN202223494592U CN219209888U CN 219209888 U CN219209888 U CN 219209888U CN 202223494592 U CN202223494592 U CN 202223494592U CN 219209888 U CN219209888 U CN 219209888U
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Abstract
The utility model relates to a solution polymerization reactor, which comprises a horizontal reaction kettle, wherein a feeding end and a second end of a first end of the horizontal reaction kettle are discharge ends, a gas distribution plate which is arranged close to the feeding end and used for uniformly spraying feeding gas into the reaction cavity is arranged in the reaction cavity, and a spiral coil which is arranged along the axial direction and used for controlling the temperature of a reaction system is arranged in the reaction cavity. The reaction kettle is of a horizontal structure, so that the back mixing phenomenon of reaction materials due to the action of self gravity can be avoided, the first-in first-out of the materials is ensured, and the residence time of the materials in the reaction kettle is consistent; the gas raw material is rapidly and uniformly dissolved and dispersed in the solvent of the reaction system through the gas distribution plate, so that the content of each monomer in the molecular chain of the copolymer is uniformly distributed, and the molecular weight is stable and controllable; the temperature of the reaction system is controlled by the spiral coil, the heat exchange area is large, the temperature adjustment is uniform, the polymerization reaction is uniform, the performance of the obtained polymerization product is excellent, and the equipment can stably run for a long time.
Description
Technical Field
The utility model relates to the field of chemical production equipment, in particular to a solution polymerization reactor.
Background
Solution polymerization is an important polymer synthesis method, and is a polymerization reaction performed in a solution state by dissolving monomers in a proper solvent and adding a catalyst (or initiator). For example, ethylene-alpha-olefin copolymers (POE) are typically produced by a solution polymerization process in which an ethylene/hydrogen gas mixture, an alpha-olefin solution, and a catalyst solution are fed into a reaction vessel where the ethylene and the alpha-olefin undergo coordination polymerization under the influence of the catalyst to form a copolymer, wherein hydrogen is used to adjust the molecular weight of the copolymer.
The existing solution polymerization reactor is generally a vertical reaction kettle, the gas raw materials, the comonomer solution and the catalyst solution are respectively fed through respective pipelines in an inserting way, then the products are discharged from the pipeline at the top of the reaction kettle, and the kettle is full. The temperature of the reaction system is regulated by a temperature regulating medium in the jacket of the reaction kettle. However, such polymerization reactors have the following drawbacks:
firstly, the gas raw materials directly enter a reaction kettle through a pipeline, so that the gas raw materials are difficult to be quickly dissolved in a solvent of a reaction system, and the gas raw materials are unevenly distributed in the reaction system; the gas raw materials generally comprise gas-phase monomers and molecular weight regulator hydrogen, and uneven distribution of the gas-phase monomers can lead to uneven content level of gas-phase monomer units in a molecular chain of the copolymer, uneven distribution of the hydrogen can be difficult to control the molecular weight of the copolymer stably;
secondly, the temperature in the kettle is regulated by a temperature regulating medium in the jacket, and the temperature in the center of the kettle is inconsistent with the temperature of the wall of the kettle due to untimely heat transfer, so that the reactivity of each position in the kettle is uneven;
thirdly, the reaction kettle is of a vertical structure, and when the reaction kettle is full of operation, reaction materials are easy to be subjected to the action of self gravity to generate backmixing phenomenon in the discharging process from the bottom to the top of the reaction kettle, so that the residence time of the reaction materials in the kettle is uneven.
The three defects of the existing polymerization reactor cause uneven copolymerization reaction, and further cause the performance of the copolymer product to be reduced or unstable. Accordingly, there is a need for further improvements in the current polymerization reactor configurations.
Disclosure of Invention
The technical problem to be solved by the utility model is to provide a solution polymerization reactor which can lead the polymerization reaction to be uniform, the obtained polymerization product has excellent performance and the equipment can stably run for a long time aiming at the current state of the art.
The technical scheme adopted for solving the technical problems is as follows:
the utility model provides a solution polymerization reactor, includes the reation kettle that has the reaction chamber, reation kettle be horizontal reation kettle, the feed end of this horizontal reation kettle's first end, second end are the discharge end, be provided with the gas distribution board that is arranged near the feed end in the reaction chamber that is used for evenly spouting the feed gas into the reaction chamber, be provided with in the reaction chamber along the spiral coil that is used for the reaction system to carry out the accuse temperature of axial arrangement.
Preferably, the first end of the reaction kettle is provided with a gas feeding pipe, a comonomer solution feeding connector and a catalyst solution feeding connector, the output end of the gas feeding pipe is communicated with the gas distribution plate, and the comonomer solution feeding connector and the catalyst solution feeding connector are arranged close to the bottom of the reaction kettle and are communicated with the reaction cavity. The comonomer solution feed connection is used to connect an upstream comonomer solution line and the catalyst solution feed connection is used to connect an upstream catalyst solution line.
Preferably, the gas distribution plate is of a hollow disc-shaped structure, and a plurality of injection holes capable of injecting feed gas towards the center of the reaction cavity are formed in the side wall of the gas distribution plate. The gas raw material is rapidly and uniformly dissolved and dispersed in the solvent of the reaction system through the circular spray holes on the gas distribution plate, so that the content of each monomer in the molecular chain of the copolymer is uniformly distributed, and the molecular weight is stable and controllable.
Preferably, a high-pressure gas connector which can be introduced into the high-pressure gas flushing gas distribution plate to avoid blocking of the injection hole is connected to the side of the gas feed pipe, so that the injection hole is prevented from being blocked after long-term use.
Preferably, a gas input joint for connecting with an upstream gas raw material pipeline is arranged at the input end of the gas feeding pipe, and a one-way valve for preventing high-pressure gas from reversely flowing to the direction of the input end of the gas feeding pipe is arranged on the gas feeding pipe and is positioned between the gas input joint and a side connecting point of the gas feeding pipe.
Preferably, a liquid inlet pipe and a liquid outlet pipe which extend along the axial direction and penetrate through the spiral coil are arranged in the reaction cavity, and the outer end parts of the liquid inlet pipe and the liquid outlet pipe are positioned outside the second end of the reaction kettle.
Preferably, the input end of the liquid inlet pipe is connected with a temperature-adjusting medium input joint, and the temperature-adjusting medium input joint is used for connecting an upstream temperature-adjusting medium input pipeline; and/or the output end of the liquid outlet pipe is connected with a temperature-adjusting medium output joint which is used for being connected with a downstream temperature-adjusting medium output pipeline.
Preferably, a polymer solution discharging pipe for outputting products is arranged at the second end of the reaction kettle, and the polymer solution discharging pipe is arranged close to the top of the reaction kettle; the top discharge can take away trace inert gas in the reaction system, so that the reaction pressure and the temperature are prevented from fluctuating due to the fact that the reaction pressure and the temperature are increased in the reaction kettle. The back pressure valve for controlling the pressure in the reaction kettle is arranged on the polymer solution discharging pipe, and the output end of the polymer solution discharging pipe is provided with a polymer solution output joint for connecting a downstream reaction termination unit.
Preferably, the spiral coil is provided with at least two sections of corrugated expansion joints. So as to prevent the thermal expansion and contraction and stress cracking caused by larger temperature difference between the inside and the outside.
Preferably, the utility model further comprises a driving motor and a stirring paddle, wherein the driving motor is arranged outside the second end of the reaction kettle, the first end of the stirring paddle is connected with the output end of the driving motor, and the second end of the stirring paddle penetrates through the second end of the reaction kettle to extend into the reaction cavity and is positioned in the middle of the center surrounded by the spiral coil, so as to stir the solution in the reaction cavity.
Compared with the prior art, the utility model has the advantages that: the reaction kettle is of a horizontal structure, and when the reaction kettle is full of the reaction kettle, the back mixing phenomenon of reaction materials due to the action of self gravity can be avoided, the first-in first-out of the materials is ensured, and the residence time of the materials in the reaction kettle is consistent; the gas raw material is rapidly and uniformly dissolved and dispersed in the solvent of the reaction system through the gas distribution plate, so that the content of each monomer in the molecular chain of the copolymer is uniformly distributed, and the molecular weight is stable and controllable; the temperature of the reaction system is controlled through the spiral coil pipe arranged in the reaction kettle, so that the heat exchange area is large, the temperature is regulated uniformly, and the consistency of the reaction activity of each position in the kettle is ensured; so that the polymerization reaction is uniform, the obtained polymerization product has excellent performance, and the equipment can stably operate for a long time.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present utility model.
Detailed Description
The utility model is described in further detail below with reference to the embodiments of the drawings.
As shown in fig. 1, the solution polymerization reactor of the present embodiment includes a reaction vessel 1 having a reaction chamber, and the reaction vessel 1 is used for solution polymerization.
The reaction kettle 1 of this embodiment is a horizontal reaction kettle, the feeding end and the second end of the first end of the horizontal reaction kettle are discharging ends, a gas distribution plate 2 which is arranged close to the feeding end and used for uniformly spraying the feeding gas into the reaction cavity is arranged in the reaction cavity, and a spiral coil 3 which is arranged along the axial direction and used for controlling the temperature of the reaction system is arranged in the reaction cavity. The spiral coil 3 is provided with a plurality of sections of corrugated expansion joints 18 so as to prevent the expansion caused by heat and contraction caused by large temperature difference between the inside and the outside and prevent stress cracking.
Specifically, the first end of the reaction kettle 1 is provided with a gas feeding pipe 7, a comonomer solution feeding connector 8 and a catalyst solution feeding connector 9, the output end of the gas feeding pipe 7 is communicated with the gas distribution plate 2, and the comonomer solution feeding connector 8 and the catalyst solution feeding connector 9 are arranged close to the bottom of the reaction kettle 1 and are communicated with the reaction cavity. Comonomer solution feed connection 8 is used to connect the upstream comonomer solution line and catalyst solution feed connection 9 is used to connect the upstream catalyst solution line.
The gas distribution plate 2 is of a hollow disc-shaped structure, and a plurality of injection holes 13 capable of injecting feed gas towards the center of the reaction cavity are formed in the side wall of the gas distribution plate 2. The gas raw material is rapidly and uniformly dissolved and dispersed in the solvent of the reaction system through the circular spray holes 13 on the gas distribution plate 2, so that the content of each monomer in the molecular chain of the copolymer is uniformly distributed, and the molecular weight is stable and controllable. The side of the gas feed pipe 7 is connected with a high-pressure gas joint 14 which can be introduced into the high-pressure gas flushing gas distribution plate 2 to avoid the blockage of the injection hole 13, so as to avoid the blockage of the injection hole after long-term use.
The gas feed pipe 7 is provided at its input end with a gas feed joint 15 for connection to an upstream gas feed line, the gas feed pipe 7 is provided with a non-return valve 17 for preventing reverse channeling of high pressure gas in the direction of the input end of the gas feed pipe 7, the non-return valve 17 being located between the gas feed joint 15 and a gas feed pipe side connection point 16.
The reaction chamber is internally provided with a liquid inlet pipe 10 and a liquid outlet pipe 11 which extend along the axial direction and penetrate through the spiral coil 3, and the outer ends of the liquid inlet pipe 10 and the liquid outlet pipe 11 are positioned outside the second end of the reaction kettle 1. The input end of the liquid inlet pipe 10 is connected with a temperature-adjusting medium input joint 19, and the temperature-adjusting medium input joint 19 is used for connecting an upstream temperature-adjusting medium input pipeline; the outlet end of the outlet pipe 11 is connected to a temperature-regulating medium outlet connection 20, which temperature-regulating medium outlet connection 20 is intended to be connected to a downstream temperature-regulating medium outlet line.
A second end of the reaction kettle 1 is provided with a polymer solution discharging pipe 12 for outputting products, and the polymer solution discharging pipe 12 is arranged close to the top of the reaction kettle 1; the top discharge can take away trace inert gas in the reaction system, so that the reaction pressure and the temperature are prevented from fluctuating due to the fact that the reaction pressure and the temperature are increased in the reaction kettle. The back pressure valve 21 for controlling the pressure in the reaction kettle 1 is arranged on the polymer solution discharging pipe 12, and the polymer solution output joint 22 for connecting a downstream reaction termination unit is arranged at the output end of the polymer solution discharging pipe 12.
The embodiment further comprises a driving motor 23 and a stirring paddle 24, wherein the driving motor 23 is arranged outside the second end of the reaction kettle 1, the first end of the stirring paddle 24 is connected with the output end of the driving motor 23, and the second end of the stirring paddle 24 penetrates through the second end of the reaction kettle 2 and stretches into the reaction cavity and is positioned in the middle of the center surrounded by the spiral coil 3 for stirring the solution in the reaction cavity.
The reaction kettle 1 of the embodiment comprises a cylinder 4 and sealing plates positioned on two sides of the cylinder 4, wherein a gas feeding pipe 7, a comonomer solution feeding connector 8 and a catalyst solution feeding connector 9 are connected to a left sealing plate 5, and a liquid feeding pipe 10 and a liquid outlet pipe 11 are connected to a right sealing plate 6. The gas distribution plate 2 is arranged close to the right side of the left sealing plate 5, the face of the gas distribution plate 2 facing the right sealing plate 6 is provided with injection holes 13, and the curved surface is sealed. The gas feeding pipe 7, the comonomer solution feeding connector 8 and the catalyst solution feeding connector 9 are all connected to the left side sealing plate 5, and the top end of the right side sealing plate 6 is connected with the polymer solution discharging pipe 12, so that the reaction materials can enter and exit from the left side and the right side.
In the embodiment, the connection mode of the left side sealing plate 5 and the right side sealing plate 6 and the cylinder 4 is the flange connection 27, so that the disassembly is convenient, and the cleaning and the maintenance in the kettle are convenient. The reaction kettle 1 further comprises a safety valve 25, wherein the input end of the safety valve 25 is connected with the left sealing plate 5, and the output end of the safety valve 25 is a high-pressure emission output joint 26 for connecting an emission tank. When an emergency occurs, the pressure in the kettle exceeds the set pressure of the safety valve 25, and the safety valve 25 can automatically open for pressure relief so as to ensure the safety of equipment and personnel.
The reaction kettle 1 of the embodiment is of a horizontal structure, and can avoid the back mixing phenomenon of reaction materials due to the action of self gravity when the kettle is full, ensure the first in first out of the materials and ensure the consistent residence time of the materials in the reaction kettle; the gas raw material is rapidly and uniformly dissolved and dispersed in the solvent of the reaction system through the gas distribution plate 2, so that the content of each monomer in the molecular chain of the copolymer is uniformly distributed, and the molecular weight is stable and controllable; the temperature of the reaction system is controlled through the spiral coil 3 arranged in the reaction kettle 1, so that the heat exchange area is large, the temperature is regulated uniformly, and the consistency of the reactivity of each position in the kettle is ensured; so that the polymerization reaction is uniform, the obtained polymerization product has excellent performance, and the equipment can stably operate for a long time.
Claims (10)
1. A solution polymerization reactor comprising a reaction vessel (1) having a reaction chamber, characterized in that: the reaction kettle (1) is a horizontal reaction kettle, a feeding end and a second end of a first end of the horizontal reaction kettle are discharging ends, a gas distribution plate (2) which is arranged close to the feeding end and used for uniformly spraying feeding gas into the reaction cavity is arranged in the reaction cavity, and a spiral coil (3) which is arranged along the axial direction and used for controlling the temperature of a reaction system is arranged in the reaction cavity.
2. The solution polymerization reactor according to claim 1, wherein: the first end of reation kettle (1) is provided with gaseous inlet pipe (7), comonomer solution feed joint (8) and catalyst solution feed joint (9), the output of gaseous inlet pipe (7) is linked together with gas distribution board (2), comonomer solution feed joint (8) and catalyst solution feed joint (9) are close to the bottom of reation kettle (1) and are arranged and are linked together with the reaction chamber.
3. The solution polymerization reactor according to claim 2, wherein: the gas distribution plate (2) is of a hollow disc-shaped structure, and a plurality of injection holes (13) capable of injecting feed gas towards the center of the reaction cavity are formed in the side wall of the gas distribution plate (2).
4. A solution polymerization reactor according to claim 3, characterized in that: the side of the gas feeding pipe (7) is connected with a high-pressure gas joint (14) which can be used for introducing high-pressure gas to flush the gas distribution plate (2) so as to avoid blockage of the injection hole (13).
5. The solution polymerization reactor according to claim 2, wherein: the gas feeding pipe is characterized in that a gas input joint (15) used for being connected with an upstream gas raw material pipeline is arranged at the input end of the gas feeding pipe (7), a one-way valve (17) used for preventing high-pressure gas from reversely flowing towards the input end direction of the gas feeding pipe (7) is arranged on the gas feeding pipe (7), and the one-way valve (17) is arranged between the gas input joint (15) and a gas feeding pipe side connecting point (16).
6. The solution polymerization reactor according to any one of claims 1 to 5, wherein: the reaction cavity is internally provided with a liquid inlet pipe (10) and a liquid outlet pipe (11) which extend along the axial direction and penetrate through the spiral coil pipe (3), and the outer end parts of the liquid inlet pipe (10) and the liquid outlet pipe (11) are positioned outside the second end of the reaction kettle (1).
7. The solution polymerization reactor according to claim 6, wherein: the input end of the liquid inlet pipe (10) is connected with a temperature-adjusting medium input joint (19), and the temperature-adjusting medium input joint (19) is used for connecting an upstream temperature-adjusting medium input pipeline; and/or the output end of the liquid outlet pipe (11) is connected with a temperature-adjusting medium output joint (20), and the temperature-adjusting medium output joint (20) is used for connecting a downstream temperature-adjusting medium output pipeline.
8. The solution polymerization reactor according to any one of claims 1 to 5, wherein: a polymer solution discharging pipe (12) for outputting products is arranged at the second end of the reaction kettle (1), and the polymer solution discharging pipe (12) is arranged close to the top of the reaction kettle (1); and/or a back pressure valve (21) for controlling the pressure in the reaction kettle (1) is arranged on the polymer solution discharging pipe (12), and a polymer solution output joint (22) for connecting a downstream reaction termination unit is arranged at the output end of the polymer solution discharging pipe (12).
9. The solution polymerization reactor according to any one of claims 1 to 5, wherein: the spiral coil (3) is provided with at least two sections of corrugated expansion joints (18).
10. The solution polymerization reactor according to any one of claims 1 to 5, wherein: still include driving motor (23) and stirring rake (24), outside the second end of reation kettle (1) was located to driving motor (23), the first end of stirring rake (24) is connected with the output of driving motor (23), the second end of stirring rake (24) passes reation kettle (1) second end and stretches into the reaction chamber and be located in the central centre that spiral coil (3) encloses, is used for stirring the solution in the reaction chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223494592.6U CN219209888U (en) | 2022-12-27 | 2022-12-27 | Solution polymerization reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223494592.6U CN219209888U (en) | 2022-12-27 | 2022-12-27 | Solution polymerization reactor |
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| Publication Number | Publication Date |
|---|---|
| CN219209888U true CN219209888U (en) | 2023-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223494592.6U Active CN219209888U (en) | 2022-12-27 | 2022-12-27 | Solution polymerization reactor |
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| CN (1) | CN219209888U (en) |
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2022
- 2022-12-27 CN CN202223494592.6U patent/CN219209888U/en active Active
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