A decarboxylation reactor for preparing fluorine-containing vinyl ether and a reaction system thereof

Abstract

In order to overcome the problems of existing preparation of fluorine-containing vinyl ether using a cylindrical decarboxylation reaction chamber, such as difficult slagging, easy wall sticking, difficult cleaning, uneven heating leading to more impurities and low yield of stirring bed reactor, the application provides a decarboxylation reactor for preparing fluorine-containing vinyl ether and a reaction system thereof. The decarboxylation reactor comprises a driving device, a shell and grinding balls, the shell is rotatably arranged, the driving device is used for driving the shell to rotate, an inner cavity is arranged in the shell, and the grinding balls are movably arranged in the inner cavity. The decarboxylation reactor provided by the application utilizes the ball milling principle to enable the reaction to occur fully, the solid carboxylate is ground into fine powder by the grinding balls in the decarboxylation process, there is no residue of slag on the inner wall of the kettle, and the discharge is convenient; it is heated more uniformly, the decarboxylation reaction is more sufficient, the yield of the crude product is improved, the impurities of the crude product are reduced, and it is suitable for industrial production.

Description

Technical Field

[0001] This utility model relates to the technical field of preparing fluorinated vinyl ethers, and more particularly to a decarboxylation reactor and reaction system for preparing fluorinated vinyl ethers. Background Technology

[0002] As an important comonomer of organofluorine materials, its main function is to introduce functional sulfonic acid groups into polymers. It can copolymerize with tetrafluoroethylene (TFE) to form polymers with sulfonic acid side chains. It is the main monomer for preparing perfluorosulfonic acid ion exchange resins. Furthermore, the perfluorosulfonic acid resin obtained by copolymerizing PSVE and TFE can be used to manufacture proton exchange membranes. This membrane is one of the core components of hydrogen fuel cell stacks and PEM hydrogen electrolyzers. At the same time, perfluorosulfonic acid ion exchange membranes are also widely used in fields such as water electrolysis for hydrogen production, energy storage batteries, atomic energy, and chlor-alkali.

[0003] 3M Innovations' Chinese patent CN200680023824.4, entitled "Preparation Method of Fluorinated Vinyl Ethers," describes a conventional solid-phase decarboxylation method involving the decarboxylation reaction of acyl fluoride with metal carbonate in a stirred bed reactor at a high temperature of 100-300°C. The specific procedure involves adding a certain amount of carbonate to the stirred bed reactor, raising the temperature above the decarboxylation temperature of the intermediate carboxylate, slowly adding acyl fluoride, and collecting the product. The yield is approximately 70%, which is low, and uneven heating leads to a high number of impurities.

[0004] Sanai Fu New Materials Co., Ltd.'s patent CN102992969B discloses a method and equipment for producing fluorinated vinyl ethers from acyl fluoride. A cylindrical decarboxylation reaction chamber and a coaxially mounted scraper cylinder coat carboxylate salts into a thin film with a thickness of 1-5 cm. The film is then heated to cause a decarboxylation reaction, forming fluorinated vinyl ethers with a yield of approximately 95%. However, the method suffers from problems such as difficulty in slag removal, easy adhesion to the wall, difficulty in ash removal and cleaning, and the need for regular equipment cleaning.

[0005] In view of the above-mentioned problems of the prior art, there is a need in the art to develop a decarboxylation reaction system that can simplify the process of producing fluorinated vinyl ethers from acyl fluoride, and has the advantages of easy operation and high product yield, and solves the problems of solid slag sticking to the reactor wall, which leads to difficult ash removal and cleaning, and uneven heating, which leads to more impurities. Utility Model Content

[0006] This invention addresses the problems of existing cylindrical decarboxylation reaction chambers used in the preparation of fluorinated vinyl ethers, which suffer from difficulties in slag discharge, easy wall adhesion, and cleaning, as well as the uneven heating in stirred bed reactors leading to numerous impurities and low yields. This application provides a decarboxylation reactor and reaction system for the preparation of fluorinated vinyl ethers.

[0007] This invention provides a decarboxylation reactor for preparing fluorinated vinyl ethers, comprising a driving device, a shell, and grinding balls. The shell is rotatably disposed, and the driving device is used to drive the shell to rotate. An inner cavity is provided inside the shell, and the grinding balls are movably disposed in the inner cavity.

[0008] Preferably, the housing includes a bottom wall and a side wall, the side wall surrounding the outer periphery of the bottom wall; the side wall is a thin-walled structure of an inverted frustum; an umbrella-shaped track is provided on one side surface of the bottom wall facing the inner cavity, and the grinding ball is disposed on the umbrella-shaped track.

[0009] Preferably, the angle between the bottom wall and the side wall is 110° to 160°.

[0010] Preferably, the decarboxylation reactor further includes a support frame, the shell is rotatably mounted on the support frame, the outer wall of the shell is provided with a first rotating tube at its axis of rotation, the driving device is used to drive the first rotating tube to rotate, the support frame is provided with inlet and outlet pipes, and the first rotating tube is rotatably connected to the inlet and outlet pipes.

[0011] Preferably, the outer wall of the housing is further provided with a second rotating tube at its rotation axis position, the first rotating tube is located at the top of the housing, the second rotating tube is located at the bottom of the housing, a discharge pipe is provided on the support frame, the second rotating tube is rotatably connected to the discharge pipe, and a discharge valve is provided on the discharge pipe.

[0012] Preferably, the diameter of the grinding ball is 0.5~5cm.

[0013] Preferably, the total volume of the grinding ball is V1, the total volume of the inner cavity is V2, and the ratio of V1 to V2 is (0.1~0.4):1.

[0014] Secondly, this application provides a reaction system for preparing fluorinated vinyl ethers, including a raw material device, a salt-forming reaction device, and the decarboxylation reactor described above. The inlet of the salt-forming reaction device is connected to the raw material device, and the outlet of the salt-forming reaction device is connected to the decarboxylation reactor.

[0015] Preferably, the reaction system further includes a first condenser, the salt formation reaction device includes a first inlet, a first outlet and a ninth outlet, the raw material device includes a second inlet, a second outlet and a third outlet, the first condenser includes a fourth outlet, a fourth inlet and a third inlet; and the decarboxylation reactor includes inlet and outlet ports. The fourth discharge port is connected to the second inlet via a pipe; the ninth discharge port is connected to the third inlet via a pipe; the second discharge port is connected to the fourth inlet via a pipe. The third discharge port is connected to the first inlet port via a pipe; The first discharge port is connected to the inlet and outlet ports via a pipe.

[0016] Preferably, the reaction system further includes a second condenser and a product receiving device, wherein the second condenser includes a sixth discharge port, a sixth inlet port and a seventh inlet port; The decarboxylation reactor includes a fifth discharge port, and the inlet and outlet of the decarboxylation reactor are connected to the sixth inlet port via pipelines; The product receiving device includes an eighth inlet and an eighth outlet; the sixth outlet is connected to the eighth inlet via a pipe; and the eighth outlet is connected to the seventh inlet via a pipe.

[0017] The decarboxylation reactor provided in this application has a rotatable shell and movably arranged grinding balls inside the cavity, which has the following effects: Firstly, under the action of centrifugal force and friction, the grinding balls impact and grind the material, utilizing the ball milling principle to ensure the reaction occurs fully. Solid carboxylates are ground into fine powder during the decarboxylation process, leaving no residue on the inner wall of the reactor and facilitating easy discharge. This solves the problems of difficult slag discharge, easy wall adhesion, and difficult cleaning associated with existing cylindrical decarboxylation reaction chambers used in the preparation of fluorinated vinyl ethers. Secondly, due to the rotation of the shell and the disturbance of the grinding balls, the fine powder formed by grinding the salt has a large specific surface area. Compared with existing decarboxylation devices, it is heated more uniformly, increasing the contact area and heat transfer ratio between reactants, resulting in a more complete decarboxylation reaction, resolving solid sintering issues, improving the yield of crude product, reducing impurities in the crude product, and making it suitable for industrial production. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a reaction system for preparing fluorinated vinyl ethers from acyl fluoride according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a decarboxylation reactor structure provided in one embodiment of the present invention; Figure 3 yes Figure 2 A magnified view of A in the middle.

[0019] 1. Raw material receiving device; 101. First raw material receiver; 102. Second raw material receiver; 2. Pipeline; 3. First condenser; 4. Salt formation reaction device; 5. Decarboxylation reactor; 511. Shell; 5111. Side wall; 5112. Bottom wall; 512. Inner cavity; 513. Grinding ball; 514. First rotating tube; 515. Inlet and outlet pipes; 516. Drive device; 517. Rotary seal; 518. Second rotating tube; 519. Outlet pipe; 6. Second condenser; 7. Product receiving device. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] To illustrate the technical solution of this utility model, specific embodiments are described below.

[0022] like Figure 2 As shown, one embodiment of the present invention provides a decarboxylation reactor for preparing fluorinated vinyl ethers, including a driving device 516, a shell 511, and grinding balls 513. The shell 511 is rotatably disposed, the driving device 516 is used to drive the shell 511 to rotate, the shell 511 is provided with an inner cavity 512, and the grinding balls 513 are movably disposed in the inner cavity 512.

[0023] The decarboxylation reactor 5 provided in this application has a rotatable shell 511 and a movably disposed grinding ball 513 in the inner cavity 512. This design offers the following advantages: Firstly, the grinding ball 513 impacts and grinds the material under the influence of centrifugal force and friction, ensuring a complete reaction using the ball milling principle. During the decarboxylation process, the solid carboxylate is ground into a fine powder by the grinding ball 513, leaving no residue on the inner wall of the reactor and facilitating easy discharge. This solves the problems of difficult slag discharge, easy wall adhesion, and difficult cleaning associated with existing cylindrical decarboxylation reaction chambers used for preparing fluorinated vinyl ethers. Secondly, due to the rotation of the shell 511 and the disturbance of the grinding ball 513, the fine powder formed by grinding the salt has a large specific surface area. Compared to existing decarboxylation devices, this results in more uniform heating, increased contact area and heat transfer ratio between reactants, more complete decarboxylation reaction, resolution of solid sintering issues, reduced impurity encapsulation, increased yield of crude product, and reduced impurities in the crude product, making it suitable for industrial production.

[0024] In one embodiment, the housing 511 includes a bottom wall 5112 and a side wall 5111, the side wall 5111 surrounding the outer periphery of the bottom wall 5112; the side wall 5111 is a thin-walled structure of an inverted frustum; an umbrella-shaped track is provided on one side surface of the bottom wall 5112 facing the inner cavity 512, and the grinding ball 513 is disposed on the umbrella-shaped track.

[0025] Specifically, the side wall 5111 surrounds the outer periphery of the bottom wall 5112. The side wall 5111 has a thin-walled structure of an inverted frustum. When the shell 511 rotates, the grinding balls 513 in the inner cavity 512 can roll by the centrifugal force of the spin, and the rolling of the grinding balls 513 grinds the material in the inner cavity 512.

[0026] like Figure 2As shown, an umbrella-shaped track is provided on the side surface of the bottom wall 5112 facing the inner cavity 512. Grinding balls 513 are arranged on the umbrella-shaped track. When the shell 511 is stationary, the grinding balls 513 are dispersed on the umbrella-shaped track and do not clump together. When the shell 511 rotates, the grinding balls 513 arranged on the umbrella-shaped track can move simultaneously in different directions due to centrifugal force and track disturbance, so that the grinding balls 513 are dispersed, the movement effect is better, which is conducive to the full grinding of solid carboxylates during decarboxylation and improves the grinding rate.

[0027] In one embodiment, the angle between the bottom wall 5112 and the side wall 5111 is 110° to 160°.

[0028] Specifically, such as Figure 2 As shown, the side wall 5111 is a thin-walled, inverted frustum structure. The angle between the side wall 5111 and the bottom wall 5112 is within the range of 110° to 160°. This is beneficial because, during the rotation of the shell 511, the grinding balls 513 inside the inner cavity 512 can roll using centrifugal force and collide with the side wall 5111, providing rolling power for the grinding balls 513. The angle should not be too large or too small. If the angle is too small, the movement range of the grinding balls 513 is small, resulting in lower efficiency; if the angle is too large, it is not conducive to slag discharge.

[0029] In specific embodiments, the included angle between the bottom wall 5112 and the side wall 5111 can be 110°, 120°, 130°, 140°, 150°, 160°, etc.

[0030] In one embodiment, the decarboxylation reactor 5 further includes a support frame, the shell 511 is rotatably mounted on the support frame, the outer wall of the shell 511 is provided with a first rotating tube 514 at its rotation axis position, the driving device 516 is used to drive the first rotating tube 514 to rotate, the support frame is provided with an inlet and outlet pipe 515, and the first rotating tube 514 is rotatably connected to the inlet and outlet pipe 515.

[0031] Specifically, such as Figure 2 As shown, the decarboxylation reactor 5 includes a support frame, and the shell 511 is rotatably mounted on the support frame. The support frame supports the shell 511 and facilitates the rotation of the shell 511.

[0032] On the rotation axis of the housing 511, a first rotating tube 514 is provided on the outer wall surface of the housing 511. The driving device 516 drives the first rotating tube 514 to rotate, and the housing 511, which is fixedly connected to the first rotating tube 514, also rotates accordingly, realizing the rotation of the housing 511. The driving device 516 may be a structure containing a motor and gears. The motor drives the gears to rotate, and the gears drive the first rotating tube 514 to rotate.

[0033] The inlet / outlet pipe 515 is fixedly mounted on the support frame. The inlet / outlet pipe 515 is rotatably connected to the first rotating pipe 514; specifically, the inlet / outlet pipe 515 is fixed, while the first rotating pipe 514 rotates relative to the inlet / outlet pipe 515. Figure 3 As shown, the inlet / outlet pipe 515 is connected to the first rotating pipe 514 via a rotary seal 517, enabling a rotatable connection between the inlet / outlet pipe 515 and the first rotating pipe 514. The rotary seal 517 ensures a sealed connection between the first rotating pipe 514 and the fixed pipe while also allowing the first rotating pipe 514 to rotate relative to the fixed pipe. The end of the inlet / outlet pipe 515 furthest from the first rotating pipe 514 is connected to pipe 2. A valve is installed on pipe 2 to facilitate the control of material entry and gaseous product discharge through valve opening and closing.

[0034] Rotary seal 517, which may be a rotary sealing joint. Inlet / outlet pipe 515 is either the material inlet or the outlet for gases generated during the decarboxylation reaction.

[0035] In a preferred embodiment, the outer wall of the housing 511 is further provided with a second rotating tube 518 at its rotation axis position. The first rotating tube 514 is located at the top of the housing 511, the second rotating tube 518 is located at the bottom of the housing 511, and a discharge tube 519 is provided on the support frame. The second rotating tube 518 is rotatably connected to the discharge tube 519.

[0036] Specifically, on the rotation axis of the shell 511, a first rotating pipe 514 is provided at the top of the shell 511 and a second rotating pipe 518 is provided at the bottom of the shell 511, so that the gaseous products generated by the decarboxylation reaction can be discharged from the inlet and outlet pipes 515. After the decarboxylation reaction is completed, the remaining waste is discharged from the outlet pipe 519.

[0037] The discharge pipe 519 is rotatably connected to the second rotating pipe 518. The discharge pipe 519 is fixedly mounted on the support frame. When the housing 511 rotates, the second rotating pipe 518 rotates with the housing 511, while the discharge pipe 519 remains fixed. The end of the discharge pipe 519 away from the second rotating pipe 518 is connected to the pipe 2. A discharge valve is installed on the pipe 2 to facilitate the discharge of waste materials after the reaction is completed by opening and closing the discharge valve.

[0038] In one embodiment, the diameter of the grinding ball 513 is 0.5cm to 5cm.

[0039] The diameter of the grinding balls 513 is selected from the above-mentioned range, which is beneficial for the impact and grinding of the materials by the grinding balls 513, increasing the contact area and heat transfer ratio between reactants, making the decarboxylation reaction more complete, and improving the yield of crude product. In specific embodiments, the diameter of the grinding balls 513 can be 0.5cm, 0.7cm, 1.0cm, 1.5cm, 2.0cm, 2.5cm, 3.0cm, 3.5cm, 4.0cm, 4.5cm, 5.0cm, etc.

[0040] In a preferred embodiment, the diameter of the grinding ball 513 is 1cm-3cm.

[0041] The diameter of the grinding ball 513 is selected from the above-mentioned preferred range to further improve the yield of crude product.

[0042] The grinding ball 513 can be made of materials such as steel, ceramics, or flint.

[0043] In one embodiment, the total volume of the grinding ball 513 is V1, the total volume of the inner cavity 512 is V2, and the ratio of V1 to V2 is (0.1~0.4):1.

[0044] Specifically, a V1:V2 ratio within the aforementioned range helps reduce production costs while ensuring that the grinding balls 513 can effectively grind the material. In specific embodiments, V1:V2 can be 0.1:1, 0.15:1, 0.2:1, 0.25:1, 0.3:1, 0.35:1, or 0.4:1.

[0045] In a preferred embodiment, the total volume of the grinding ball 513 is V1, the total volume of the inner cavity 512 is V2, and the ratio of V1 to V2 is (0.1~0.2):1.

[0046] Specifically, the ratio of V1 to V2 is within the above-mentioned preferred range, which ensures that the grinding ball 513 can effectively grind the material, while also reducing the process cost.

[0047] Secondly, this application provides a reaction system for preparing fluorinated vinyl ethers, including a raw material device 1, a salt-forming reaction device 4, and the decarboxylation reactor 5 described above. The inlet of the salt-forming reaction device 4 is connected to the raw material device 1, and the outlet of the salt-forming reaction device 4 is connected to the decarboxylation reactor 5.

[0048] The reaction system for preparing fluorinated vinyl ethers provided in this application has the following advantages: 1) The equipment is relatively simple, low in cost, and can be used for continuous production, yielding high-yield (over 90%) perfluoro-2-(2-thioylfluoroethoxy)propyl vinyl ether, making it very suitable for industrial production. 2) Using the decarboxylation reactor 5 described above, the grinding balls 513 impact and grind the material under the action of spin centrifugal force and friction, allowing the reaction to occur fully using the ball milling principle. The solid carboxylate is ground into fine powder by the steel balls during the decarboxylation process, leaving no residue on the inner wall of the reactor and facilitating discharge. On the other hand, due to the spin and disturbance of the grinding balls 513, the fine powder has a large specific surface area, resulting in more uniform heating compared to existing decarboxylation devices, increasing the contact area and heat transfer ratio, solving the solid sintering problem, and making the decarboxylation reaction more complete, increasing the yield of crude product, and reducing product impurities. 3) The reaction system provided in this application is green and environmentally friendly. The solvent and grinding balls 513 used can be reused, causing no environmental pollution and significantly reducing costs.

[0049] In one embodiment, the reaction system further includes a first condenser 3, the salt formation reaction device 4 includes a first inlet, a first outlet and a ninth outlet, the raw material device 1 includes a second outlet, a third outlet and a second inlet, the first condenser 3 includes a fourth outlet, a fourth inlet and a third inlet; and the decarboxylation reactor 5 includes inlet and outlet ports. The fourth discharge port is connected to the second inlet port via pipe 2; the ninth discharge port is connected to the third inlet port via pipe 2; the second discharge port is connected to the fourth inlet port via pipe 2. The third discharge port is connected to the first inlet port via pipe 2; The first discharge port is connected to the inlet and outlet ports via pipe 2.

[0050] Specifically, such as Figure 1 As shown, the raw material device 1 includes two raw material receivers, defined as a first raw material receiver 101 and a second raw material receiver 102. It is understood that the raw material device 1 may include one, two, or more raw material receivers; this application does not limit the scope of the application.

[0051] A third discharge port is provided at the bottom of the raw material device 1. The raw material can flow out through the third discharge port of the raw material device 1, flow through the pipe 2 and be added into the salt forming reaction device 4 through the first inlet of the salt forming reaction device 4.

[0052] The top of the raw material device 1 is provided with a second discharge port and a second inlet port. Since there may be some volatilization in the raw material device 1, the volatilized raw material flows out from the second discharge port, flows through the pipe 2, and enters the first condenser 3 through the fourth inlet port. After the volatilized raw material is condensed by the first condenser 3, it flows out through the fourth discharge port of the first condenser 3, flows through the pipe 2, and re-enters the raw material device 1 through the second inlet port. Then it flows out through the third discharge port of the raw material device 1, flows through the pipe 2, and is added to the salt formation reaction device 4 through the first inlet port.

[0053] In the salt-forming reaction device 4, part of the raw material is vaporized. The vaporized raw material flows out from the ninth outlet of the salt-forming reaction device 4, flows through the pipe 2, and enters from the third inlet of the first condenser 3. The vaporized raw material in the salt-forming reaction device 4 is condensed by the first condenser 3 and then flows out through the fourth outlet of the first condenser 3, flows through the pipe 2, and re-enters the raw material device 1 through the second inlet. Then it flows out through the third outlet of the raw material device 1, flows through the pipe 2, and is re-added into the salt-forming reaction device 4 through the first inlet.

[0054] The salt-forming reaction device 4 is in which the raw materials undergo a salt-forming reaction. After the salt-forming reaction is completed, the mixture flows out through the first outlet of the salt-forming reaction device 4, flows through pipe 2, and flows through the inlet and outlet of the decarboxylation reactor 5, through the inlet and outlet pipes 515 and the first rotating pipe 514 of the decarboxylation reactor 5, and finally flows into the inner cavity 512 of the shell 511. The inlet and outlet of the decarboxylation reactor 5 is the end of the inlet and outlet pipe 515 of the decarboxylation reactor 5 away from the first rotating pipe 514.

[0055] It should be noted that the housing 511 is provided with an outlet, which is connected to the end of the first rotating tube 514 away from the feed pipe 515, so that the material can enter the inner cavity 512.

[0056] In one embodiment, the reaction system further includes a second condenser 6 and a product receiving device 7, wherein the second condenser 6 includes a sixth outlet, a sixth inlet, and a seventh inlet; The decarboxylation reactor 5 includes a fifth discharge port, and the inlet and outlet of the decarboxylation reactor 5 are connected to the sixth inlet port through a pipe 2; The product receiving device 7 includes an eighth inlet and an eighth outlet; the sixth outlet is connected to the eighth inlet via a pipe 2; and the eighth outlet is connected to the seventh inlet via a pipe 2.

[0057] After the salt formation reaction is completed, the mixture flows into the decarboxylation reactor 5 for decarboxylation reaction. The gaseous products generated during the decarboxylation reaction are discharged through the inlet and outlet of the decarboxylation reactor 5. The gaseous products flow into the sixth inlet of the second condenser 6 through the pipe 2 and enter the second condenser 6 through the sixth inlet. After being condensed, the gaseous products become liquid products. The liquid products are discharged through the sixth outlet of the second condenser 6, flow through the pipe 2, and enter the product receiving device 7 through the eighth inlet of the product receiving device 7.

[0058] If there are still gaseous products in the product receiving device 7, the gaseous products will escape through the eighth outlet of the product receiving device 7, flow through the pipeline 2, and enter the seventh inlet of the second condenser 6. The gaseous products will continue to be condensed and discharged from the sixth outlet of the second condenser 6, and enter the product receiving device 7.

[0059] After the decarboxylation reaction is completed, the remaining liquid waste flows through the second rotating pipe 518, the discharge pipe 519, and is discharged through the fifth discharge port of the decarboxylation reactor 5. The fifth discharge port is connected to the pipe 2, and a valve is installed on the pipe 2 to facilitate the control of the discharge of liquid waste. The fifth discharge port is the end of the discharge pipe 519 away from the second rotating pipe 518.

[0060] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model 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 of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A decarboxylation reactor for preparing fluorinated vinyl ethers, characterized in that, It includes a drive device, a housing, and grinding balls. The housing is rotatably disposed, and the drive device is used to drive the housing to rotate. The housing has an inner cavity, and the grinding balls are movably disposed in the inner cavity.

2. The decarboxylation reactor according to claim 1, characterized in that, The housing includes a bottom wall and a side wall, the side wall surrounding the outer periphery of the bottom wall; the side wall is a thin-walled structure of an inverted frustum; an umbrella-shaped track is provided on the side surface of the bottom wall facing the inner cavity, and the grinding ball is disposed on the umbrella-shaped track.

3. The decarboxylation reactor according to claim 2, characterized in that, The angle between the bottom wall and the side wall is 110°~160°.

4. The decarboxylation reactor according to claim 1, characterized in that, The decarboxylation reactor further includes a support frame, the shell is rotatably mounted on the support frame, the outer wall of the shell is provided with a first rotating tube at its axis of rotation, the driving device is used to drive the first rotating tube to rotate, the support frame is provided with inlet and outlet pipes, and the first rotating tube is rotatably connected to the inlet and outlet pipes.

5. The decarboxylation reactor according to claim 4, characterized in that, The outer wall of the housing is further provided with a second rotating tube at its rotation axis position. The first rotating tube is located at the top of the housing, and the second rotating tube is located at the bottom of the housing. The support frame is provided with a discharge pipe, and the second rotating tube is rotatably connected to the discharge pipe.

6. The decarboxylation reactor according to claim 1, characterized in that, The diameter of the grinding ball is 0.5~5cm.

7. The decarboxylation reactor according to claim 1, characterized in that, The total volume of the grinding ball is V1, and the total volume of the inner cavity is V2. V1: V2 is (0.1~0.4):

1.

8. A reaction system for preparing fluorinated vinyl ethers, characterized in that, It includes a raw material device, a salt-forming reaction device, and a decarboxylation reactor as described in any one of claims 1 to 7, wherein the inlet of the salt-forming reaction device is connected to the raw material device, and the outlet of the salt-forming reaction device is connected to the decarboxylation reactor.

9. The reaction system for preparing fluorinated vinyl ethers according to claim 8, characterized in that, The reaction system further includes a first condenser; the salt formation reaction device includes a first inlet, a first outlet, and a ninth outlet; the raw material device includes a second inlet, a second outlet, and a third outlet; the first condenser includes a fourth outlet, a fourth inlet, and a third inlet; and the decarboxylation reactor includes inlet and outlet ports. The fourth discharge port is connected to the second inlet via a pipe; the ninth discharge port is connected to the third inlet via a pipe; the second discharge port is connected to the fourth inlet via a pipe. The third discharge port is connected to the first inlet port via a pipe; The first discharge port is connected to the inlet and outlet ports via a pipe.

10. The reaction system for preparing fluorinated vinyl ethers according to claim 8, characterized in that, The reaction system also includes a second condenser and a product receiving device, wherein the second condenser includes a sixth outlet, a sixth inlet and a seventh inlet; The decarboxylation reactor includes a fifth discharge port, and the inlet and outlet of the decarboxylation reactor are connected to the sixth inlet port via pipelines; The product receiving device includes an eighth inlet and an eighth outlet; the sixth outlet is connected to the eighth inlet via a pipe; and the eighth outlet is connected to the seventh inlet via a pipe.

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