Separation device for hydrogen fluoride in pentafluoropropane production

Abstract

The invention relates to the technical field of hydrogen fluoride separation, in particular to a hydrogen fluoride separation device in pentafluoropropane production, which comprises a washing assembly and a mixing assembly. Wherein the washing assembly is communicated with a discharging pipeline; a first pipeline is communicated between the mixing assembly and the washing assembly, the mixing assembly is respectively communicated with a water inlet pipeline and a feeding pipeline, the water inlet pipeline is used for supplying water to the mixing assembly, and the feeding pipeline is used for conveying mixed materials to the mixing assembly; the mixing assembly is used for mixing water and mixed materials and then conveying the mixed materials into the washing assembly through a first pipeline. The device has the effect of improving the separation efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen fluoride separation, and in particular to a hydrogen fluoride separation device in pentafluoropropane production. Background Art

[0002] At present, in the field of fluorine chemical industry, especially in the production process of fluorine-containing organic compounds such as pentafluoropropane (HFC-245fa), a key technical challenge is how to effectively separate the azeotrope formed during the reaction process. The formation of azeotropes is due to the fact that HFC-245fa and hydrofluoric acid (HF) have similar boiling points under specific conditions, which makes them difficult to separate by conventional distillation methods. This azeotropic phenomenon causes a large amount of HF and HFC-245fa to be discharged from the reaction system together, which brings difficulties to subsequent treatment and purification. In order to solve the above problems, tower separation technology is usually used in related technologies, that is, HF is removed from organic matter by washing with a water washing tower. Specifically, this process involves adding water to the mixture of organic matter and HF in the bottom of the tower to wash and remove HF, and the formed HF aqueous solution is then discharged into the wastewater system for treatment.

[0003] Regarding the above-mentioned related technologies: In order to reduce the consumption of alkali solution in the subsequent alkali washing process, the concentration of the absorbed hydrogen fluoride aqueous solution is usually not high, generally less than 20% (weight percentage), which limits the separation efficiency. Summary of the invention

[0004] In order to improve the separation efficiency, the present application provides a separation device for hydrogen fluoride in the production of pentafluoropropane.

[0005] The present application provides a separation device for hydrogen fluoride in the production of pentafluoropropane, which adopts the following technical solution: A separation device for hydrogen fluoride in pentafluoropropane production, comprising: A washing component, wherein the washing component is connected to a discharge pipeline; A mixing component, wherein a first pipeline is connected between the mixing component and the washing component, and a water inlet pipeline and a feed pipeline are respectively connected to the mixing component, wherein the water inlet pipeline is used to supply water to the mixing component, and the feed pipeline is used to transport mixed materials to the mixing component, and the mixing component is used to mix water and mixed materials and then transport them to the washing component through the first pipeline.

[0006] By adopting the above technical scheme, by setting a washing component and a mixing component, it is possible to achieve full mixing of water and a mixture, and the mixture refers to a mixture of organic matter and anhydrous hydrogen fluoride. After the mixture is mixed with water, the anhydrous hydrogen fluoride in the mixture will be converted into an aqueous hydrofluoric acid solution, and the density of the aqueous hydrofluoric acid solution is different from that of the organic matter, so that when the aqueous hydrofluoric acid solution and the organic solution enter the washing component, the aqueous hydrofluoric acid and the organic solution will be layered, and most of the organic solution will gather at the bottom of the washing component, and the aqueous hydrofluoric acid solution will gather at the top of the washing component, so that most of the organic solution can be discharged from the bottom of the washing component through the discharge pipeline, and the aqueous hydrofluoric acid solution overflows the washing component from the top, so as to achieve effective separation, and improve separation efficiency to a certain extent. In this process, a higher concentration of aqueous hydrofluoric acid solution can be used as a washing liquid to further improve separation efficiency. In addition, the device is simple in structure and easy to operate, which helps to improve separation efficiency and reduce the cost of subsequent treatment.

[0007] Optionally, the washing component includes a first washing tank and a second washing tank, the discharge pipe is connected to the bottom of the first washing tank, the first pipe is connected to the first washing tank, the top of the first washing tank is connected to the second pipe, the second pipe is connected to the second washing tank, the bottom of the second washing tank is connected to the third pipe, and the third pipe is respectively connected to the mixing component and the water inlet pipe.

[0008] By adopting the above technical scheme, the azeotrope generated in the production process of pentafluoropropane can be effectively separated by using the two-stage washing structure of the first washing tank and the second washing tank. Specifically, the mixed material is first fully mixed with water in the mixing assembly, and then enters the first washing tank through the first pipeline. In the first washing tank, due to the density difference between organic matter and aqueous hydrofluoric acid solution, the heavier organic solution is discharged from the bottom of the first washing tank and discharged from the system through the discharge pipeline, while the lighter aqueous hydrofluoric acid solution overflows from the top of the first washing tank to the second washing tank. In the second washing tank, further separation process causes more aqueous hydrofluoric acid solution to overflow from the top of the tank, while a small amount of organic solution returns to the mixing assembly from the bottom of the second washing tank to continue circulating washing. In this way, not only the separation efficiency of the aqueous hydrofluoric acid solution is improved, but also the concentration of the aqueous hydrofluoric acid solution is reduced, thereby reducing the alkali consumption in the subsequent alkali washing process.

[0009] Optionally, the mixing assembly includes a circulation pump and a mixer, a fourth pipeline is connected between the circulation pump and the mixer, the first pipeline is connected to the mixer, and the feed pipeline is connected to the fourth pipeline.

[0010] By adopting the above technical solution, the fourth pipeline between the circulation pump and the mixer ensures that the water and the mixed material are fully mixed, thereby improving the washing effect. At the same time, the connection between the first pipeline and the mixer ensures that the mixed material can be smoothly transported to the first washing tank, while the connection between the feed pipeline and the fourth pipeline ensures the continuous supply of the mixed material, thereby improving the stability and efficiency of the entire system.

[0011] Optionally, a flow monitor is provided between the circulation pump and the feed pipeline, and the flow monitor is used to monitor the flow rate of the transported water.

[0012] By adopting the above technical solution, the flow monitor can monitor the amount of water delivered to the mixing component in real time, ensuring that the ratio of water to the mixed material is accurately controllable, thereby improving separation efficiency and product quality. At the same time, the flow monitor can also detect and adjust water flow anomalies in a timely manner to avoid poor separation effects caused by insufficient or excessive water.

[0013] Optionally, a cooling element is provided on the third pipeline, and the cooling element is used to remove the heat generated during the washing process.

[0014] By adopting the above technical solution and setting of the cooling element, the heat generated during the washing process can be effectively removed, the influence of high temperature on the washing effect can be avoided, and the separation efficiency and stability can be improved.

[0015] Optionally, the second washing tank is connected to an overflow pipe, and one end of the overflow pipe away from the second washing tank is connected to a collection tank.

[0016] By adopting the above technical solution, the overflow pipe connected to the second washing tank can guide the aqueous hydrofluoric acid solution separated in the second washing tank to the collection tank, thereby facilitating the storage of the aqueous hydrofluoric acid solution, ensuring the stable operation of the system, reducing waste and environmental pollution. In addition, the design also improves the safety and reliability of the entire separation device and ensures the efficient separation process.

[0017] Optionally, a liquid level meter is provided on the second washing tank, and the liquid level meter is used to detect the liquid level on the second washing tank.

[0018] By adopting the above technical solution and setting the liquid level meter, it is possible to monitor the liquid level changes in the second washing tank in real time, ensure stability and safety during the washing process, and avoid equipment failure or poor washing effect caused by excessively high or low liquid levels.

[0019] Optionally, a pushing assembly is provided on the first washing tank, and the pushing assembly includes a driving member and a pushing plate. The pushing plate is slidably arranged in the first washing tank and fits against the inner wall of the first washing tank. The driving member is arranged on the first washing tank and connected to the pushing plate. The driving member is used to drive the pushing plate to move.

[0020] By adopting the above technical solution, when the solution in the first washing tank needs to be discharged, the driving member works to drive the push plate to move in the direction close to the second pipeline. The push plate pushes the solution to move, so that the aqueous hydrofluoric acid solution located above the organic solution can flow into the second washing tank through the second pipeline, and is beneficial to avoid the organic solution from flowing into the second washing tank together, thereby helping to improve the separation efficiency.

[0021] Optionally, a through pipe is provided on the push plate, and an on-off valve is provided on the through pipe. When the push plate is located at the bottom of the first washing tank, the through pipe is connected to the discharge pipeline.

[0022] By adopting the above technical solution, when the push plate is close to the bottom of the first washing tank, the through pipe is connected to the discharge pipeline. At this time, the on-off valve is opened, so that the organic solution on the push plate can be discharged into the first washing tank through the discharge pipeline, which is conducive to achieving efficient discharge of the organic solution, avoiding residue, and improving separation efficiency.

[0023] Optionally, valves are provided on the discharge pipeline, the first pipeline, the water inlet pipeline and the feed pipeline.

[0024] By adopting the above technical solution, valves are set on the discharge pipeline, the first pipeline, the water inlet pipeline and the feed pipeline, which can achieve accurate control of each pipeline and ensure the stability and reliability of the entire separation process. The setting of the valve helps to prevent material leakage, improve the safety of the system, and can flexibly adjust the flow of each pipeline, thereby optimizing the separation effect.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. Through the cooperation of the washing component, the discharge pipeline, the mixing component, the first pipeline, the water inlet pipeline and the feed pipeline, the water and the organic solution containing hydrogen fluoride are fully mixed, and the different densities of the aqueous hydrofluoric acid solution and the organic matter can be used to effectively separate the aqueous hydrofluoric acid solution and the organic solution, thereby significantly improving the removal efficiency of the aqueous hydrofluoric acid solution, solving the problem of low concentration of hydrogen fluoride solution in the traditional water washing tower washing method, reducing the consumption of alkali solution, and reducing the cost of the subsequent alkali washing process; 2. Through the cooperation of the first washing tank, the second washing tank and the second pipeline, bipolar washing is achieved, thereby effectively improving the separation efficiency of the aqueous hydrofluoric acid solution and reducing the concentration of the aqueous hydrofluoric acid solution, thereby reducing the consumption of alkali solution in the subsequent alkali washing process; 3. Through the mutual cooperation of the driving member, the push plate, the through pipe and the on-off valve, the driving member can discharge the aqueous hydrofluoric acid solution in the first washing tank into the second washing tank through the push plate, and after the aqueous hydrofluoric acid solution is completely discharged, the driving member can drive the push plate to move toward the bottom of the first washing tank so that the through pipe is connected with the discharge pipeline. At this time, the on-off valve is opened to discharge the organic solution from the first washing tank, which is beneficial to reduce the possibility of the aqueous hydrofluoric acid solution being discharged along with the organic solution, and further beneficial to improve the separation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of a hydrogen fluoride separation device in pentafluoropropane production in Example 1 of the present application.

[0027] Figure 2 It is a structural schematic diagram of the first washing tank and the pushing assembly in Example 2 of the present application.

[0028] Description of reference numerals: 1. Washing assembly; 11. Discharge pipeline; 12. First pipeline; 13. First washing tank; 14. Second washing tank; 141. Liquid level meter; 15. Second pipeline; 16. Third pipeline; 17. Overflow pipeline; 2. Mixing assembly; 21. Water inlet pipeline; 22. Feed pipeline; 23. Circulation pump; 24. Mixer; 25. Fourth pipeline; 26. Flow monitor; 3. Collecting tank; 4. Cooling part; 5. Valve; 6. Pushing assembly; 61. Driving part; 62. Pushing plate; 621. Through pipe; 622. On-off valve. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-2 This application is described in further detail.

[0030] The embodiment of the present application discloses a device for separating hydrogen fluoride in the production of pentafluoropropane.

[0031] It should be noted that, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] Example 1 Reference Figure 1 A separation device for hydrogen fluoride in pentafluoropropane production includes a washing component 1 and a mixing component 2. The washing component 1 is connected with a discharge pipeline 11, the mixing component 2 is connected with a first pipeline 12, the mixing component 2 is respectively connected with a water inlet pipeline 21 and a feed pipeline 22, the water inlet pipeline 21 is used to supply water to the mixing component 2, the feed pipeline 22 is used to transport a mixed material to the mixing component 2, and the mixing component 2 is used to mix water and the mixed material and then transport them to the washing component 1 through the first pipeline 12, thereby achieving the purpose of effectively separating hydrogen fluoride.

[0033] It should be noted that the mixed material refers to a mixed solution of organic matter and anhydrous hydrogen fluoride, and in this embodiment, the organic matter refers to pentafluoropropane. In other embodiments, the water inlet pipe 21 can also be used to transport an aqueous hydrofluoric acid solution with a concentration range of 0-50% into the mixing component 2.

[0034] Reference Figure 1 The washing assembly 1 includes a first washing tank 13 and a second washing tank 14. The first washing tank 13 and the second washing tank 14 are arranged close to each other, and the discharge pipe 11 is connected to the bottom of the first washing tank 13, and the first pipe 12 is connected to the first washing tank 13, so that the mixing assembly 2 can easily transport water and mixed materials into the first washing tank 13.

[0035] The top of the first washing tank 13 is connected to a second pipeline 15, which is connected to the upper middle of the second washing tank 14 to prevent the solution in the second washing tank 14 from flowing back into the first washing tank 13. The bottom of the second washing tank 14 is connected to a third pipeline 16, which is connected to the mixing assembly 2 and the water inlet pipeline 21 respectively.

[0036] When the mixed material is mixed with water, the anhydrous hydrogen fluoride in the mixed material will be converted into an aqueous hydrofluoric acid solution, and the density of the aqueous hydrofluoric acid solution is different from that of the organic matter. Therefore, when the aqueous hydrofluoric acid solution and the organic solution enter the first washing tank 13, the aqueous hydrofluoric acid solution and the organic solution will be stratified, and most of the organic solution will gather at the bottom of the first washing tank 13, while the aqueous hydrofluoric acid solution will gather at the top of the first washing tank 13, so that most of the organic solution can be discharged from the bottom of the first washing tank 13 through the discharge pipeline 11, and the aqueous hydrofluoric acid solution will overflow from the first washing tank 13 through the second pipeline 15 and flow into the second washing tank 14 to achieve preliminary separation.

[0037] The aqueous hydrofluoric acid solution overflowing from the first washing tank 13 into the second washing tank 14 will carry part of the organic solution, and the aqueous hydrofluoric acid solution and the organic solution will also be separated in the second washing tank 14. At this time, the organic solution containing part of the aqueous hydrofluoric acid solution at the bottom of the second washing tank 14 can flow back to the mixing assembly 2 through the third pipeline 16 to participate in the next separation.

[0038] Reference Figure 1 The second washing tank 14 is connected with an overflow pipe 17, and the connection position between the overflow pipe 17 and the second washing tank 14 is located below the second pipe 15, and the end of the overflow pipe 17 away from the second washing tank 14 is connected with the collecting tank 3, so that when the aqueous hydrofluoric acid solution separated in the second washing tank 14 exceeds a specified height, the aqueous hydrofluoric acid solution can overflow into the collecting tank 3 through the overflow pipe 17, so as to store the aqueous hydrofluoric acid solution, thereby reducing waste and environmental pollution.

[0039] The second washing tank 14 is provided with a liquid level meter 141. In this embodiment, the liquid level meter 141 can be a float liquid level meter 141, a magnetic flap liquid level meter 141 or a radar liquid level meter 141, and a suitable type is selected according to the requirements of accuracy and response speed. The use of the liquid level meter 141 can monitor the liquid level in the tank in real time to ensure the stable operation of the separation process.

[0040] Reference Figure 1 The mixing assembly 2 includes a circulation pump 23 and a mixer 24. One end of the mixer 24 is connected to the first pipeline 12, and a fourth pipeline 25 is connected between the other end of the mixer 24 and the circulation pump 23, and the feed pipeline 22 is connected to the fourth pipeline 25, so as to facilitate the transportation of the mixed material into the fourth pipeline 25. In this embodiment, the mixer 24 can be a static mixer 24 or a dynamic mixer 24.

[0041] The circulation pump 23 can provide sufficient power to circulate the solution between the first pipeline 12, the second pipeline 15, the third pipeline 16 and the fourth pipeline 25, so as to facilitate the transportation of water and the mixed material to the mixer 24, so that the water and the mixed material can be fully mixed by the mixer 24 to enhance the separation effect.

[0042] Reference Figure 1 A flow monitor 26 is installed between the circulation pump 23 and the feed pipe 22. The flow monitor 26 is used to monitor the flow rate of the transported water. In this embodiment, the flow monitor 26 can be a flow meter or a flow sensor. Common flow meters include turbine flow meters, electromagnetic flow meters, and ultrasonic flow meters. A suitable type can be selected according to actual needs. The use of the flow monitor 26 can ensure accurate control of the water volume, avoid excess or deficiency, and thus ensure the separation effect.

[0043] Reference Figure 1 A cooling element 4 is installed on the third pipeline 16. In this embodiment, the cooling element 4 can be a heat exchanger or a condenser, so as to facilitate cooling of the refluxed organic solution to avoid high temperature affecting the washing effect and improve the separation efficiency and stability.

[0044] The first pipeline 12, the second pipeline 15, the third pipeline 16, the fourth pipeline 25, the discharge pipeline 11, the overflow pipeline 17, the feed pipeline 22 and the water inlet pipeline 21 are all provided with valves 5, and the valves 5 can be manual valves or automatic valves, and the appropriate type can be selected according to the degree of automation and control requirements. The use of valves 5 can conveniently control the opening and closing of each pipeline to ensure the normal operation of the system.

[0045] The implementation principle of the separation device of hydrogen fluoride in the production of pentafluoropropane in the embodiment of the present application is as follows: when it is necessary to separate anhydrous hydrogen fluoride from organic matter, the mixed material is first transported to the fourth pipeline 25 through the feed pipeline 22, and water is transported to the third pipeline 16 through the water inlet pipeline 21. At the same time, the circulation pump 23 is started, and the circulation pump 23 drives the water and the mixed material into the mixer 24 for mixing, and the mixed solution is transported to the first washing tank 13. In this process, the anhydrous hydrogen fluoride will be converted into an aqueous hydrofluoric acid solution, and the aqueous hydrofluoric acid solution and the organic solution will be stratified in the first washing tank 13 due to different densities.

[0046] Next, most of the organic solution is discharged from the bottom of the first washing tank 13 through the discharge pipeline 11 , and most of the aqueous hydrofluoric acid solution and a small amount of the organic solution overflow from the top of the first washing tank 13 to the second washing tank 14 .

[0047] Finally, in the second washing tank 14, the aqueous hydrofluoric acid solution overflows from the overflow pipe 17 into the collecting tank 3, and the organic solution containing part of the aqueous hydrofluoric acid at the bottom flows back into the third pipe 16, and participates in the next separation process after being cooled by the cooling element 4, and is circulated and washed again, thereby realizing the separation of anhydrous hydrogen fluoride in the organic matter.

[0048] Example 2 Reference Figure 2 The difference between this embodiment and embodiment 1 is that a pushing component 6 is added.

[0049] The pushing assembly 6 includes a driving member 61 and a pushing plate 62. The pushing plate 62 is slidably disposed in the first washing tank 13 and is in contact with the inner wall of the first washing tank 13, and the driving member 61 is disposed on the first washing tank 13 and is fixedly connected to the pushing plate 62. In this embodiment, the driving member 61 may be a motor, a cylinder or a hydraulic cylinder, and a suitable type may be selected according to the required thrust and speed, so that the driving member 61 may be used to drive the pushing plate 62 to move in the first washing tank 13.

[0050] A through pipe 621 is fixedly connected to the push plate 62, the through pipe 621 communicates with both sides of the push plate 62, and an on-off valve 622 is installed on the through pipe 621, the on-off valve 622 is used to control the on-off of the through pipe 621. In this embodiment, the on-off valve 622 can be a ball valve, a gate valve or a butterfly valve, and a suitable type is selected according to the sealing performance and the convenience of operation.

[0051] Reference Figure 1 and Figure 2 When the solution in the first washing tank 13 needs to be discharged, the driving member 61 works to drive the push plate 62 to move toward the top of the first washing tank 13. The push plate 62 pushes the solution to move, so that the aqueous hydrofluoric acid solution located above the organic solution can flow into the second washing tank 14 through the second pipeline 15, and it is helpful to prevent the organic solution from flowing into the second washing tank 14 together. And when the aqueous hydrofluoric acid solution is completely discharged, the driving member 61 can drive the push plate 62 to move toward the bottom of the first washing tank 13, so that the through pipe 621 is connected with the discharge pipeline 11. At this time, the on-off valve 622 is opened to discharge the organic solution from the first washing tank 13, which is helpful to reduce the possibility of the aqueous hydrofluoric acid solution being discharged along with the organic solution, and then it is helpful to improve the separation effect and improve the separation efficiency to a certain extent.

[0052] It should be noted that, in this embodiment, the second pipeline 15 is connected to the top of the first washing tank 13 .

[0053] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A separation device for hydrogen fluoride in the production of pentafluoropropane, characterized in that: include: A washing component (1), wherein the washing component (1) is connected to a discharge pipeline (11); A mixing component (2), wherein a first pipeline (12) is connected between the mixing component (2) and the washing component (1), and a water inlet pipeline (21) and a material feed pipeline (22) are respectively connected to the mixing component (2), wherein the water inlet pipeline (21) is used to supply water to the mixing component (2), and the material feed pipeline (22) is used to transport a mixed material to the mixing component (2), and the mixing component (2) is used to mix water and the mixed material and then transport the mixed material to the washing component (1) through the first pipeline (12).

2. The device for separating hydrogen fluoride in the production of pentafluoropropane according to claim 1, characterized in that: The washing assembly (1) comprises a first washing tank (13) and a second washing tank (14); the discharge pipeline (11) is connected to the bottom of the first washing tank (13); the first pipeline (12) is connected to the first washing tank (13); the top of the first washing tank (13) is connected to a second pipeline (15); the second pipeline (15) is connected to the second washing tank (14); the bottom of the second washing tank (14) is connected to a third pipeline (16); the third pipeline (16) is connected to the mixing assembly (2) and the water inlet pipeline (21) respectively.

3. The separation device for hydrogen fluoride in the production of pentafluoropropane according to claim 2, characterized in that: The mixing assembly (2) comprises a circulation pump (23) and a mixer (24); a fourth pipeline (25) is connected between the circulation pump (23) and the mixer (24); the first pipeline (12) is connected to the mixer (24); and the feed pipeline (22) is connected to the fourth pipeline (25).

4. The separation device for hydrogen fluoride in the production of pentafluoropropane according to claim 3, characterized in that: A flow rate monitor (26) is provided between the circulation pump (23) and the feed pipeline (22), and the flow rate monitor (26) is used to monitor the flow rate of the transported water.

5. The separation device for hydrogen fluoride in the production of pentafluoropropane according to claim 2, characterized in that: The third pipeline (16) is provided with a cooling element (4), and the cooling element (4) is used to remove heat generated during the washing process.

6. The separation device for hydrogen fluoride in the production of pentafluoropropane according to claim 2, characterized in that: The second washing tank (14) is connected to an overflow pipe (17), and one end of the overflow pipe (17) away from the second washing tank (14) is connected to a collection tank (3).

7. The separation device for hydrogen fluoride in the production of pentafluoropropane according to claim 2, characterized in that: The second washing tank (14) is provided with a liquid level meter (141), and the liquid level meter (141) is used to detect the liquid level on the second washing tank (14).

8. The device for separating hydrogen fluoride in the production of pentafluoropropane according to claim 2, characterized in that: The first washing tank (13) is provided with a pushing assembly (6), the pushing assembly (6) comprising a driving member (61) and a pushing plate (62), the pushing plate (62) being slidably arranged in the first washing tank (13) and abutting against the inner wall of the first washing tank (13), the driving member (61) being arranged on the first washing tank (13) and connected to the pushing plate (62), the driving member (61) being used to drive the pushing plate (62) to move.

9. The device for separating hydrogen fluoride in the production of pentafluoropropane according to claim 8, characterized in that: The push plate (62) is provided with a through pipe (621), and the through pipe (621) is provided with an on-off valve (622); when the push plate (62) is located at the bottom of the first washing tank (13), the through pipe (621) is in communication with the discharge pipeline (11).

10. The device for separating hydrogen fluoride in the production of pentafluoropropane according to claim 1, characterized in that: Valves (5) are provided on the discharge pipeline (11), the first pipeline (12), the water inlet pipeline (21) and the feed pipeline (22).

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