Supercritical fluid polymerization reaction kettle

Abstract

The present application provides a supercritical fluid polymerization reaction kettle, comprising: a kettle body; a stirring mechanism, arranged in the kettle body, wherein the stirring mechanism comprises a stirring shaft and at least two stirring assemblies, the stirring shaft comprises at least two sleeve shafts which are sequentially connected in the axial direction of the kettle body, every two adjacent sleeve shafts have opposite rotation directions, each sleeve shaft is connected to at least one stirring assembly, the stirring assembly comprises at least two stirring blades, and the stirring blades are arranged at two sides of the sleeve shaft in a spaced-apart manner; and a cooling assembly, comprising at least one cooling pipe, wherein the cooling pipe is annularly arranged on the periphery of the stirring shaft and is staggered from the stirring blades. In the supercritical fluid polymerization reaction kettle of the present application, by providing stirring assemblies which are coaxially arranged and rotate in opposite directions, materials in the reaction kettle are more turbulent and more uniformly mixed; and cooling pipes are distributed at different positions in the supercritical fluid polymerization reaction kettle and are staggered from stirring assemblies, so that heat generated by a polymerization reaction in the reaction kettle can be effectively absorbed, thereby ensuring the stability and uniformity of products, and improving the production efficiency.

Description

A supercritical fluid polymerization reactor

[0001] This application claims priority to Chinese Patent Application No. 202411647447.8, filed on November 18, 2024, entitled "A Polymerization Reactor", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of chemical reaction equipment technology, and in particular to a supercritical fluid polymerization reactor. Background Technology

[0003] Supercritical fluid polymerization reactors are devices used for polymerization reactions and are widely used in fields such as chemical engineering, pharmaceuticals, and materials science. For example, supercritical fluid polymerization reactors can support complex reaction processes such as supercritical fluid polymerization, ensuring the safety and efficiency of the reaction.

[0004] Polymerization reactions typically release a large amount of heat, which can lead to excessively high reactor temperatures, affecting the reaction process and product quality. Therefore, timely removal of the heat generated during the reaction is crucial. However, commonly used supercritical fluid polymerization reactors often suffer from inadequate cooling and stirring structure designs, easily resulting in uneven mixing of materials within the reactor and the inability to remove heat in a timely manner, leading to low production efficiency. Summary of the Invention

[0005] In view of the above problems, this application provides a supercritical fluid polymerization reactor, which can effectively absorb the heat generated by the polymerization reaction in the reactor and make the reactants mix evenly, ensuring the stability and uniformity of the product and improving production efficiency.

[0006] To achieve the above objectives, this application provides a supercritical fluid polymerization reactor, comprising: a reactor body; a stirring mechanism disposed within the reactor body; the stirring mechanism includes a stirring shaft and at least two stirring groups, the stirring shaft comprising at least two sleeve shafts sequentially connected along the axial direction of the reactor body, each pair of adjacent sleeve shafts rotating in opposite directions, and each sleeve shaft being connected to at least one stirring group; the stirring group comprising at least two stirring blades, the stirring blades being arranged at intervals on both sides of the sleeve shaft; and a cooling assembly comprising at least one cooling pipe, the cooling pipe being arranged around the outer periphery of the stirring shaft and offset from the stirring blades.

[0007] In one possible implementation, at least two stirring blades are arranged at intervals on one side of the sleeve shaft, and the cooling pipe includes at least two layers of cooling channels arranged sequentially from the inside to the outside, and the cooling channels are connected sequentially from the inside to the outside.

[0008] In one possible implementation, a cooling channel is provided between the sleeve shaft and the adjacent stirring blades, and between every two adjacent stirring blades.

[0009] In one possible implementation, the stirring assembly further includes a connecting rod connected to the sleeve shaft, and each stirring blade is connected to the connecting rod.

[0010] In one possible implementation, a cooling pipe is provided between every two adjacent stirring groups along the axial direction of the vessel body.

[0011] In one possible implementation, the cooling pipe includes a first section and a second section connected alternately in sequence, the first section extending along the height direction of the vessel body, and the second section connecting the opposite ends of adjacent first sections.

[0012] In one possible implementation, the stirring shaft further includes at least one gear set connected between two adjacent sleeve shafts.

[0013] In one possible implementation, the gear set includes a first gear, a second gear, and a transmission gear. The first gear and the second gear are respectively mounted on two adjacent sleeve shafts, and the transmission gear is located between the first gear and the second gear, with both ends of the transmission gear meshing with the first gear and the second gear, respectively.

[0014] In one possible implementation, the cooling assembly further includes a drive pump connected to a cooling pipe.

[0015] In one possible implementation, a plunger pump is installed on the vessel body, and the plunger pump is in communication with the interior of the vessel body.

[0016] The supercritical fluid polymerization reactor provided in this application includes a reactor body and a stirring mechanism and a cooling assembly disposed within the reactor body. The stirring mechanism includes a stirring shaft and stirring groups. The stirring shaft comprises at least two sleeve shafts connected sequentially along the axial direction of the reactor body, with adjacent sleeve shafts rotating in opposite directions. Each sleeve shaft is connected to at least one stirring group, and each stirring group includes at least two stirring blades arranged at intervals on both sides of the sleeve shaft. When adjacent sleeve shafts rotate in opposite directions, the stirring groups connected to the sleeve shafts rotate in the opposite direction, thereby causing the stirring blades on the adjacent sleeve shafts to rotate coaxially in opposite directions. Therefore, a strong shear force is generated at the interface between the two, which can make the fluid turbulence inside the reactor more intense and the mixing more uniform. The cooling assembly is arranged around the outer periphery of the stirring shaft. The cooling assembly includes at least one cooling pipe that passes through the stirring blades and is offset from them. This cooling pipe can effectively absorb the heat generated by the polymerization reaction inside the reactor, preventing excessively high temperatures from affecting the reaction process. At the same time, when the stirring mechanism is stirring, a strong shear force is generated at the junction with the cooling pipe, which can break the polymer film attached to the cooling pipe, so that the cooling pipe always maintains good cooling efficiency, ensuring the stability and uniformity of the product and improving production efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 is a three-dimensional structural schematic diagram of a supercritical fluid polymerization reactor provided in an embodiment of this application;

[0019] Figure 2 is a side view of a supercritical fluid polymerization reactor provided in an embodiment of this application;

[0020] Figure 3 is a side view of a supercritical fluid polymerization reactor provided in an embodiment of this application from another perspective;

[0021] Figure 4 is a top view of a supercritical fluid polymerization reactor provided in an embodiment of this application;

[0022] Figure 5 is a schematic diagram of the gear set provided in an embodiment of this application;

[0023] Figure 6 is a schematic diagram of the gear set provided in the embodiment of this application from different perspectives.

[0024] Explanation of reference numerals in the attached drawings: 10-Supercritical fluid polymerization reactor; 100-Stirring mechanism; 200-Cooling assembly; 110-Stirring shaft; 120-Stirring group; 210-Cooling pipe; 1201-First stirring group; 1202-Second stirring group; 111-Sleeve shaft; 112-Gear set; 121-Stirring blade; 122-Connecting rod; 211-Cooling channel; 212-First section; 213-Second section; 214-Cooling inlet; 215-Cooling outlet; 1121-First gear; 1122-Second gear; 1123-Transmission gear; 2111-First cooling channel; 2112-Second cooling channel. Detailed Implementation

[0025] As described in the background section, a large amount of heat is released during the polymerization reaction, which can easily lead to excessively high temperatures in the polymerization reactor. This can affect the normal progress of the reaction, potentially impacting catalyst activity and causing a decline in product quality. This not only reduces the polymerization rate but also poses significant challenges to safe production.

[0026] In view of this, this application provides a supercritical fluid polymerization reactor, including a reactor body and a stirring mechanism and a cooling assembly disposed within the reactor body. The stirring mechanism includes a stirring shaft and stirring groups, wherein the stirring shaft includes at least two sleeve shafts connected sequentially along the axial direction of the reactor body with adjacent sleeve shafts rotating in opposite directions. Each sleeve shaft is connected to at least one stirring group, and each stirring group includes at least two stirring blades arranged at intervals on both sides of the sleeve shaft. When adjacent sleeve shafts rotate in opposite directions, the stirring groups connected to the sleeve shafts are driven to rotate in opposite directions, thereby driving the stirring blades on the adjacent sleeve shafts to rotate coaxially in opposite directions. Therefore, a strong shear force can be generated at the interface between the two, which can make the fluid turbulence in the reactor more intense and the mixing more uniform. The cooling assembly is arranged around the outer periphery of the stirring shaft. The cooling assembly includes at least one cooling pipe that can pass through the stirring blades and is offset from the stirring blades. It can effectively absorb the heat generated by the polymerization reaction in the reactor and avoid excessive temperature affecting the reaction process in the reactor. At the same time, when the stirring mechanism is stirring, a strong shear force can be generated at the junction with the cooling pipe, which can break the polymer film attached to the cooling pipe, so that the cooling pipe can maintain good cooling efficiency, ensure the stability and uniformity of the product, and improve production efficiency.

[0027] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0028] Figure 1 is a three-dimensional structural diagram of the supercritical fluid polymerization reactor provided in the embodiment of this application.

[0029] Figure 2 is a side view of a supercritical fluid polymerization reactor provided in an embodiment of this application.

[0030] Figure 3 is a side view of the supercritical fluid polymerization reactor provided in an embodiment of this application from another perspective.

[0031] Figure 4 is a top view of a supercritical fluid polymerization reactor provided in an embodiment of this application.

[0032] Referring to Figures 1 to 4, this embodiment provides a supercritical fluid polymerization reactor 10. The supercritical fluid polymerization reactor 10 can be widely used in chemical, pharmaceutical, and materials science fields. For example, the supercritical fluid polymerization reactor 10 can be used in polymerization reactions using supercritical fluids. Supercritical fluids refer to fluids above their critical temperature and critical pressure, possessing unique physicochemical properties such as low surface tension, low viscosity, and high diffusion coefficient, showing great application potential in polymerization reactions. The supercritical fluid polymerization reactor 10 can be used to carry out polymerization reactions of polymer monomers that can reach a supercritical state.

[0033] As shown in Figures 1, 2, 3, and 4, the supercritical fluid polymerization reactor 10 includes a reactor body (not shown in the figures), and a stirring mechanism 100 is provided in the reactor body. The stirring mechanism 100 includes a stirring shaft 110, and the stirring shaft 110 includes at least two sleeve shafts 111. The sleeve shafts 111 are connected sequentially along the axial direction of the reactor body, and the adjacent sleeve shafts 111 rotate in opposite directions.

[0034] In one possible implementation, a gear set 112 can be provided between adjacent sleeve shafts 111, and the reverse rotation of adjacent sleeve shafts 111 can be achieved through the transmission structure of the gear set 112. Figure 5 is a structural schematic diagram of the gear set provided in an embodiment of this application. Figure 6 is a structural schematic diagram of the gear set provided in an embodiment of this application from different perspectives. In Figure 6(a), it is a side view of the gear set 112, and in Figure 6(b), it is a top view of the gear set 112. Referring to Figures 5 and 6, the gear set 112 is connected between two adjacent sleeve shafts 111. Specifically, the gear set may include a first gear 1121, a second gear 1122, and a transmission gear 1123. The first gear 1121 and the second gear 1122 are respectively mounted on the two ends of two adjacent sleeve shafts 111, and the transmission gear 1123 is mounted between the first gear 1121 and the second gear 1122. The two ends of the transmission gear 1123 mesh with the first gear 1121 and the second gear 1122 respectively. When the first gear 1121 rotates, the transmission gear 1123 and the second gear 1122 can also rotate accordingly.

[0035] In one possible implementation, the top of the supercritical fluid polymerization reactor 10 may be provided with an opening, and the sleeve shaft 111 located at the uppermost end of the stirring shaft may extend out of the reactor body, and the sleeve shaft 111 is connected to a drive motor (not shown in the figure) located outside the reactor body.

[0036] Of course, the bottom of the vessel can also have an opening, and the sleeve 111 at the bottom of the stirring shaft can extend out of the vessel. The sleeve 111 is connected to the drive motor located outside the vessel. This application embodiment does not limit this.

[0037] Taking the connection between the uppermost sleeve shaft 111 and the drive motor as an example, the drive motor can drive the uppermost sleeve shaft 111 to rotate. For instance, the drive motor can drive the uppermost sleeve shaft 111 to rotate clockwise, thereby driving the first gear 1121 to rotate clockwise. The first gear 1121 meshes with one end of the transmission gear 1123, thus driving the transmission gear 1123 to rotate counterclockwise. The other end of the transmission gear 1123 meshes with the second gear 1122, thereby driving the second gear 1122 to rotate counterclockwise, and the second gear 1122 can in turn drive the adjacent sleeve shaft 111 to rotate counterclockwise. Thus, reverse rotation between adjacent sleeve shafts 111 is achieved.

[0038] Alternatively, to reduce the number of openings in the supercritical fluid polymerization reactor 10 and improve its sealing performance, the uppermost sleeve shaft 111 may not extend outside the reactor body; instead, the stirring shaft may be driven to rotate using other methods. For example, based on the principle of magnetic coupling, the uppermost sleeve shaft 111 can be rotated through the interaction of magnetic fields, and then the adjacent sleeve shafts can be rotated in the opposite direction through the transmission action of the gear set 112.

[0039] As shown in Figure 1, the stirring mechanism also includes a stirring assembly 120, which is connected to the sleeve shaft 111. The stirring assembly 120 can rotate with the sleeve shaft 111. Each stirring assembly 120 is provided with at least two stirring blades 121, which are arranged at intervals on both sides of the sleeve shaft 111.

[0040] The mixing assembly 120 may also include a connecting rod 122 for connecting the mixing blade 121 and the sleeve shaft 111. For example, the connecting rod 122 may be radially connected to the sleeve shaft 111, and the mixing blade 121 is connected to the connecting rod 122.

[0041] For ease of explanation, this embodiment defines the two stirring groups connected by adjacent sleeves as the first stirring group 1201 and the second stirring group 1202, respectively. That is, the adjacent sleeve shafts 111 can rotate in opposite directions via the transmission structure of the gear set 112, thereby driving the first stirring group 1201 and the second stirring group 1202 on the adjacent sleeve shafts 111 to rotate in opposite directions. Compared to the commonly used stirring method in supercritical fluid polymerization reactors where the stirring blades rotate coaxially and in the same direction, the stirring group 120 in this embodiment can achieve coaxial reverse rotation. Thus, during stirring, a shear force can be generated between the first stirring group 1201 and the second stirring group 1202, making the fluid turbulence within the supercritical fluid polymerization reactor 10 more intense, the mixing more uniform, and ensuring the consistency of the reaction process throughout the reactor, thereby achieving a higher conversion rate.

[0042] In addition, as shown in Figures 1 to 4, the supercritical fluid polymerization reactor 10 also includes a cooling component 200. Since a large amount of heat is generated during the polymerization reaction, this heat will cause the reactor temperature of the supercritical fluid polymerization reactor 10 to rise, affecting the progress of the polymerization reaction. Furthermore, the increased temperature may affect the activity of the catalyst in the polymerization reaction, thereby affecting product quality. Therefore, the cooling component can promptly remove the heat generated during the polymerization process.

[0043] The cooling assembly 200 includes at least one cooling pipe 210, which is arranged around the outer periphery of the stirring shaft 110, can pass between adjacent stirring blades 121 and is offset from the stirring blades 121, and a cooling medium can pass through the cooling pipe 210.

[0044] In one possible implementation, the cooling pipe 210 may be provided with at least two layers of cooling channels 211 from the inside out, and the cooling channels 211 are connected sequentially from the inside out. That is, a layer of cooling channels 211 may be provided between the sleeve shaft 111 and the adjacent stirring blade 121, and a layer of cooling channels 211 may also be provided between two adjacent stirring blades 121.

[0045] Referring to Figures 1 and 4, for ease of explanation, in this embodiment, the cooling channel between the sleeve shaft 111 and the adjacent stirring blade 121 is defined as the first cooling channel 2111, and the cooling channel 211 between two adjacent stirring blades 121 is defined as the second cooling channel 2112. When the cooling medium enters from the cooling inlet 214, it first flows through the first cooling channel 2111, and then through the second cooling channel 2112 to the cooling outlet 215. The first cooling channel 2111 and the second cooling channel 2112 are staggered with the stirring blades 121, which can effectively cool the heat generated during the polymerization reaction and avoid excessively high temperatures affecting the reaction efficiency and catalyst activity.

[0046] Specifically, the cooling pipe 210 may include a first section 212 and a second section 213 connected alternately in sequence. The first section 212 extends along the height of the supercritical fluid polymerization reactor 10, covering as much area as possible along the height of the reactor body to ensure similar temperatures throughout the reactor and achieve better cooling. Specifically, the first section 212 may pass between the sleeve shaft 111 and the stirring blade 121, or between adjacent stirring blades 121, and the axial height of the first section 212 is less than the axial distance between the two connecting rods 122 of adjacent sleeve shafts 111. The second section 213 connects the opposite ends of two adjacent first sections 212, connecting multiple layers of cooling channels. The second section 213 can be a horizontal section or an arc-shaped section; this embodiment does not impose specific limitations on this.

[0047] Referring to Figure 1, a cooling inlet 214 and a cooling pipe 210 can be provided on the side wall of the supercritical fluid polymerization reactor 10. It should be noted that when the number of layers of the stirring group 120 is greater than 2, one cooling pipe 210 can be provided between each two adjacent stirring groups, and multiple cooling pipes can share one cooling inlet 214 and one cooling outlet 215.

[0048] In one possible implementation, the cooling assembly 200 may further include a drive pump (not shown in the figure), which is located outside the supercritical fluid polymerization reactor 10 and connected to the cooling inlet 214 of the cooling pipe 210. The drive pump drives the cooling medium to flow in from the cooling inlet 214 and out from the cooling inlet 214 to remove the heat generated in the supercritical fluid polymerization reactor 10 due to the polymerization reaction.

[0049] It should be noted that as the polymerization reaction proceeds, the molecular weight and viscosity of the fluid inside the reactor gradually increase, which may cause a polymer film to adhere to the cooling pipe 210, affecting the cooling efficiency. However, in this embodiment, the first stirring group 1201 and the second stirring group 1202 rotate coaxially and in opposite directions during stirring, thus creating a high-shear zone between them. This intensifies the turbulence within the supercritical fluid polymerization reactor 10, thereby breaking down the film adhering to the cooling pipe 210 and ensuring that the cooling pipe maintains good cooling efficiency. Simultaneously, the strong turbulence increases the heat transfer coefficient between the cooling pipe 210 and the fluid, which is beneficial for the cooling pipe 210 to effectively cool the heat inside the reactor.

[0050] Similarly, when the stirring group 120 rotates, high shear zones will also be generated between the stirring blade 121 and the cooling plate channel 211, between the stirring blade 121 and the sleeve shaft 111, and between the connecting rod 122 and the cooling plate channel 211. These zones can break the adhesive film attached to the cooling pipe 210, ensuring the cooling efficiency of the cooling pipe 210 and making the reaction in the supercritical fluid polymerization reactor 10 more uniform.

[0051] In addition, a plunger pump (not shown in the figure) can be installed on the body of the supercritical fluid polymerization reactor 10. Before the reaction, the required materials or catalysts are prepared and added to the plunger pump. In this way, when materials need to be added during the reaction, there is no need to open the reactor. The required materials can be directly added to the supercritical fluid polymerization reactor 10 through the plunger pump, which can ensure the sealing of the reaction process.

[0052] The supercritical fluid polymerization reactor 10 of this application can be used for polymerization reactions of supercritical fluids. For example, the supercritical fluid polymerization reactor 10 can be used for polymerization reactions of supercritical propylene.

[0053] For example, 370g of propylene monomer is added to a 2L supercritical fluid polymerization reactor 10, and 7mg of catalyst is added to a plunger pump. The supercritical fluid polymerization reactor 10 is heated and pressurized to above the critical temperature of propylene (92°C) and critical pressure (4.62MPa), bringing the fluid to a supercritical state. Adjacent shafts 111 rotate in one direction via a gear set 112, simultaneously driving the stirring assembly 120 on the adjacent shafts 111 to rotate in the opposite direction. This creates a high-shear zone between the two, making the fluid turbulence more intense and dispersing the polymer monomer throughout the reactor, resulting in a more uniform reaction and effectively improving the quality of the polymerization reaction. The reactor is then heated to 120°C, and the pressure inside rises to 6.5MPa. The catalyst in the plunger pump is then pushed into the supercritical fluid polymerization reactor 10. Under the catalysis of the catalyst, the polymer monomer begins the polymerization reaction, generating a large amount of heat.

[0054] For example, the cooling pipe inlet is connected to the drive motor, driving the cooling medium to flow in from the cooling inlet and out from the cooling outlet, thereby cooling the heat generated during the polymerization reaction and maintaining the reactor temperature at approximately 120°C. In one possible implementation, the cooling medium can be cooling water or silicone oil; this application does not impose specific limitations on this.

[0055] In addition, at least two temperature sensors can be installed inside the supercritical fluid polymerization reactor 10 to monitor and compare the temperature at different locations inside the reactor during the reaction process. For example, two temperature sensors can be installed inside the reactor, with the first temperature sensor placed on the outer wall of the cooling channel 211 and the second temperature sensor placed at the center of the stirring blade 121. The readings of the first and second temperature sensors are observed after a period of reaction.

[0056] In this embodiment, after 10 minutes of reaction, the temperature measured at the first temperature sensor was 119.5°C, and the temperature measured at the second temperature sensor was 120.1°C. The difference between the two temperatures was only 0.6°C, indicating that the cooling component 200 of this application has a good cooling effect. Furthermore, the strong shear force formed by the interaction between the stirring mechanism 100 and the cooling component 200 can effectively break down the film adhering to the cooling pipe 210 during the reaction, ensuring uniform reaction throughout. After the reaction stopped, the reaction conversion rate reached 26%, indicating that the supercritical fluid polymerization reactor 10 of this application has good reaction efficiency.

[0057] In addition, to verify the stirring effect of the coaxial counter-rotating stirring of the stirring group 120 in the supercritical fluid polymerization reactor 10 provided in this application embodiment, in one possible implementation, the gear group 112 structure of the supercritical fluid polymerization reactor 10 is removed while keeping other structures unchanged. For example, adjacent groups can be replaced by rigid connections, or different connecting rods 122 can share a common shaft, thereby achieving the co-rotation of the stirring group 120.

[0058] Keeping the feed rate and heating program constant, a first temperature sensor was placed on the outer wall of the cooling channel 211 inside the reactor, and a second temperature sensor was placed at the center of the stirring blade 121. After 10 minutes of reaction, the temperature measured by the first temperature sensor was 118.2℃, and the temperature measured by the second temperature sensor was 122.1℃, a difference of 3.9℃. This indicates that when the stirring unit 120 was stirring in the same direction, the temperature inside the reactor was not uniform. Furthermore, after the reaction stopped, the conversion rate was 21%, lower than the conversion rate when the stirring unit 120 was stirring in the opposite direction. This indicates that coaxial reverse stirring of the stirring units is beneficial for making the reaction more uniform, maintaining a stable and uniform temperature inside the reactor, and improving the efficiency of the polymerization reaction.

[0059] In one possible implementation, the stirring mechanism 100 and cooling assembly 200 in the supercritical fluid polymerization reactor 10 are removed, and the cooling pipe inlet and cooling pipe outlet on the reactor body are sealed.

[0060] Keeping the feed rate and heating program constant, a temperature sensor was placed on the inner wall of the supercritical fluid polymerization reactor 10. After 4 minutes of reaction, a temperature runaway phenomenon occurred, with the temperature sensor measuring 152.4℃. The pressure inside the reactor rose to 9MPa, triggering the safety interlock and injecting an inactivator to terminate the reaction. This indicates that the stirring mechanism 100 and the cooling component 200 inside the supercritical fluid polymerization reactor 10 work together to effectively cool the heat generated by the polymerization reaction, while also ensuring more uniform mixing and improving reaction efficiency.

[0061] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A supercritical fluid polymerization reactor characterized by, include: The vessel body; A stirring mechanism is disposed within the vessel body; the stirring mechanism includes a stirring shaft and at least two stirring groups; the stirring shaft includes at least two sleeve shafts connected sequentially along the axial direction of the vessel body, with each pair of adjacent sleeve shafts rotating in opposite directions, and at least one stirring group connected to each sleeve shaft; the stirring group includes at least two stirring blades, which are arranged at intervals on both sides of the sleeve shaft. The cooling assembly includes at least one cooling pipe, which is arranged around the outer periphery of the stirring shaft and offset from the stirring blades.

2. The supercritical fluid polymerization reactor of claim 1, wherein, At least two stirring blades are arranged at intervals on one side of the sleeve shaft, and the cooling pipe includes at least two layers of cooling channels arranged sequentially from the inside to the outside, and the cooling channels are connected sequentially from the inside to the outside.

3. The supercritical fluid polymerization reactor of claim 2, wherein, A cooling channel is provided between the sleeve shaft and the adjacent stirring blades, and between every two adjacent stirring blades.

4. The supercritical fluid polymerization reactor of any one of claims 1-3, wherein, The stirring assembly also includes a connecting rod, which is connected to the sleeve shaft, and each of the stirring blades is connected to the connecting rod.

5. The supercritical fluid polymerization reactor of claim 4, wherein, Along the axial direction of the vessel body, a cooling pipe is provided between every two adjacent stirring groups.

6. The supercritical fluid polymerization reactor of any one of claims 1-3, wherein the supercritical fluid polymerization reactor is a continuous flow reactor. The cooling pipe includes a first section and a second section connected alternately in sequence. The first section extends along the height direction of the vessel body, and the second section is connected between the opposite ends of the adjacent first sections.

7. The supercritical fluid polymerization reactor of any one of claims 1-3, wherein the supercritical fluid polymerization reactor is a continuous flow reactor. The stirring shaft also includes at least one gear set, which is connected between two adjacent sleeve shafts.

8. The supercritical fluid polymerization reactor of claim 7, wherein, The gear set includes a first gear, a second gear, and a transmission gear. The first gear and the second gear are respectively mounted on two adjacent sleeve shafts. The transmission gear is located between the first gear and the second gear, and both ends of the transmission gear mesh with the first gear and the second gear, respectively.

9. The supercritical fluid polymerization reactor of any one of claims 1-3, wherein, The cooling assembly also includes: Drive the pump, which is connected to the cooling pipe.

10. The supercritical fluid polymerization reactor of any one of claims 1-3, wherein the supercritical fluid polymerization reactor is a continuous flow reactor. A plunger pump is installed on the vessel body, and the plunger pump is connected to the interior of the vessel body.

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