Apparatus and method for preparing methylsulfonyl fluoride

Abstract

The application discloses a kind of methylsulfonyl fluoride preparation devices, including methylsulfonyl chloride quantitative tank, reaction filtering device, distillation drying device, methylsulfonyl fluoride condenser, methylsulfonyl fluoride storage tank, ethylene glycol condenser and ethylene glycol storage tank;A kind of methylsulfonyl fluoride preparation method, comprising the following steps: S1, addition processing: sodium fluoride and ethylene glycol are added in reaction filtering device 2, then methylsulfonyl chloride is added in reaction filtering device;S2, filtration processing: the product after reaction in step S1 is filtered;S3, distillation processing: methylsulfonyl fluoride and ethylene glycol filtrate enter distillation drying device and are recycled ethylene glycol processing.The application is separated by setting filter screen, so that sodium fluoride is recycled, and sodium fluoride can be recycled in reaction filtering device, so that the problem of not easy separation into sodium chloride is avoided, the generation of three wastes is reduced, and industrial production is facilitated.

Description

Technical Field

[0001] This invention relates to the field of fine chemical technology, and in particular to an apparatus and method for preparing methanesulfonyl fluoride. Background Technology

[0002] Methylsulfonyl fluoride is an important raw material for fine chemical synthesis. It is insoluble in water but soluble in hydrogen fluoride. It can be used to prepare trifluoromethylsulfonyl fluoride by electrochemical fluorination. At present, the main preparation method of methylsulfonyl fluoride is to fluorinate methylsulfonyl chloride in an aqueous solution of potassium fluoride. Potassium fluoride is used as a reactant, so that the chlorine in methylsulfonyl chloride is replaced by fluorine, thereby obtaining methylsulfonyl fluoride.

[0003] The disadvantages of this preparation process are as follows: 1. Since the fluorination process is carried out in an aqueous solution, some methanesulfonyl chloride will undergo hydrolysis, resulting in a relatively low yield; 2. Since the fluorination process is not a homogeneous reaction, it will separate into an aqueous phase and an organic phase, leading to incomplete reaction; 3. The methanesulfonyl fluoride obtained by this method has low purity, and the solution after the reaction contains aqueous solutions of potassium chloride and potassium fluoride, requiring further purification; 4. Due to the excess of potassium fluoride, the aqueous solution of potassium chloride after the reaction will contain a small amount of potassium fluoride, as well as impurities produced by the hydrolysis of methanesulfonyl chloride, which cannot be directly recycled, thus generating waste. Summary of the Invention

[0004] The purpose of this invention is to provide an apparatus and method for preparing methanesulfonyl fluoride to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the specific technical solution of the methanesulfonyl fluoride preparation apparatus and method of the present invention is as follows:

[0006] An apparatus for preparing methanesulfonyl fluoride includes a methanesulfonyl chloride metering tank, a reaction filtration device, a distillation and drying device, a methanesulfonyl fluoride condenser, a methanesulfonyl fluoride storage tank, an ethylene glycol condenser, and an ethylene glycol storage tank. The methanesulfonyl chloride metering tank, the reaction filtration device, and the distillation and drying device are connected in sequence. The outlet of the distillation and drying device is connected to the methanesulfonyl fluoride condenser and the ethylene glycol condenser. The methanesulfonyl fluoride storage tank is connected below the methanesulfonyl fluoride condenser, and the ethylene glycol storage tank is connected below the ethylene glycol condenser. The reaction filtration device consists of a tank body and a cover. A stirring assembly is provided inside the reaction filtration device. A discharge pipe is provided at the bottom of the tank body through a discharge port. A filter screen is provided inside the discharge pipe. A movable channel is provided on the discharge pipe. A sliding rod is fixed on the inner wall of the movable channel. A top plate connected to the filter screen is slidably sleeved on the outer wall of the sliding rod through a reset mechanism. A rotating motor is fixed on the inner wall of the movable channel. The rotating motor cooperates with the top plate through a lifting mechanism.

[0007] Preferably, the reset mechanism includes a reset spring sleeved on the outside of the slide bar, with both ends of the reset spring elastically connected to the outer wall of the top plate and the inner wall of the movable channel, respectively.

[0008] Preferably, the lifting mechanism includes a cam connected to the output shaft of a rotating motor, and the bottom wall of the top plate is provided with a pressing groove corresponding to the cam.

[0009] Preferably, the stirring assembly includes: a stirring shaft rotatably mounted on the bottom wall of the cover, a stirring motor connected to the stirring shaft mounted on the upper end face of the cover, multiple stirring rods mounted on the outer wall of the stirring shaft, a jacket mounted on the outer wall of the stirring shaft, an installation ring mounted on the jacket via a limiting mechanism, a water pipe connected to the pump body passing through the installation ring, and a support mechanism corresponding to the stirring shaft mounted inside the tank.

[0010] Preferably, the limiting mechanism includes a limiting ring fixedly disposed on the outer wall of the mounting ring, and the inner wall of the jacket is provided with a limiting groove corresponding to the limiting ring.

[0011] Preferably, the support mechanism includes a support frame disposed inside the tank body, and the upper end face of the support frame is provided with a support groove that cooperates with the stirring shaft.

[0012] This invention also provides a method for preparing methanesulfonyl fluoride, comprising the following steps:

[0013] S1. Addition process: Add sodium fluoride and ethylene glycol to the reaction filter, and then add methanesulfonyl chloride dropwise to the reaction filter;

[0014] S2. Filtration: Filter the product after the reaction in step S1, and leave the excess sodium fluoride in the reaction filter for reuse next time.

[0015] S3. Distillation treatment: The filtrate is distilled and dried. During the distillation and drying process, the solid material obtained by evaporation includes sodium chloride, and the liquid material obtained by distillation and condensation includes methanesulfonyl fluoride and ethylene glycol. The ethylene glycol is recovered and recycled.

[0016] Preferably, the weight ratio of sodium fluoride to ethylene glycol is 1:(1.05-1.15), and the molar ratio of methanesulfonyl chloride to sodium fluoride is 1:(1.05-1.15).

[0017] Preferably, the reaction temperature is maintained at (20-50)℃, the reaction pressure at (0-0.002)MPa, and the reaction time at (3-6)h.

[0018] Preferably, the distillation pressure during the distillation and drying process is (-0.1 to -0.08) MPa, and the temperature at which the methanesulfonyl fluoride material is collected is (40 to 75) °C.

[0019] The apparatus and method for preparing methanesulfonyl fluoride of the present invention have the following beneficial effects:

[0020] 1. By reacting sodium fluoride and methanesulfonyl chloride in ethylene glycol solvent, water is not required, thus avoiding the generation of impurities due to hydrolysis caused by the addition of water.

[0021] 2. By installing a filtration device in the reactor, sodium chloride and sodium fluoride can be separated, thereby realizing the recovery of sodium fluoride. Sodium fluoride can be returned to the reaction filtration device for reuse, thus avoiding the problem of difficulty in separation when it enters sodium chloride, reducing the generation of waste, and facilitating industrial production.

[0022] 3. By setting up components such as cams and top plates, vibration can be generated by these components when the filter mesh is clogged, thereby shaking off the blockage and ensuring its filtration capacity.

[0023] 4. By using sodium fluoride, the solids are better dispersed in the later stage of distillation, thereby reducing the possibility of potassium chloride solids encapsulating the product in the later stage of distillation, thus improving the yield and reducing production costs.

[0024] 5. By setting a jacket and water pipes on the stirring assembly, and cooperating with the external heat exchange tubes of the reaction filtration device, a dual internal and external heat exchange and cooling treatment is achieved, ensuring the cooling effect and efficiency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the apparatus for preparing methylsulfonyl fluoride according to the present invention;

[0026] Figure 2 This is a schematic diagram of the reaction filtration device of the present invention;

[0027] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A;

[0028] Figure 4 This is a vertical cross-sectional schematic diagram of components such as the jacket and mounting ring.

[0029] The markings in the diagram are as follows: 1. Methylsulfonyl chloride metering tank; 2. Reaction filtration device; 3. Distillation and drying device; 4. Methylsulfonyl fluoride condenser; 5. Methylsulfonyl fluoride storage tank; 6. Ethylene glycol condenser; 7. Ethylene glycol storage tank; 8. Stirring shaft; 9. Stirring motor; 10. Support frame; 11. Stirring rod; 12. Jacket; 13. Water pipe; 14. Discharge port; 15. Discharge pipe; 16. Filter screen; 17. Baffle; 18. Movable channel; 19. Top plate; 20. Slide rod; 21. Return spring; 22. Rotary motor; 23. Cam; 24. Extrusion groove; 25. Mounting ring; 26. Limiting ring; 27. Limiting groove. Detailed Implementation

[0030] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0031] Example 1

[0032] like Figure 1-4 As shown, the present invention provides an apparatus for preparing methanesulfonyl fluoride, comprising a methanesulfonyl chloride metering tank 1, a reaction filtration device 2, a distillation and drying device 3, a methanesulfonyl fluoride condenser 4, a methanesulfonyl fluoride storage tank 5, an ethylene glycol condenser 6, and an ethylene glycol storage tank 7. The methanesulfonyl chloride metering tank 1, the reaction filtration device 2, and the distillation and drying device 3 are connected in sequence. The outlet of the distillation and drying device 3 is connected to the methanesulfonyl fluoride condenser 4 and the ethylene glycol condenser 6. The methanesulfonyl fluoride storage tank 5 is connected below the methanesulfonyl fluoride condenser 4, and the ethylene glycol storage tank 7 is connected below the ethylene glycol condenser 6. The reaction filtration device 2 consists of a tank and a cover that are threadedly connected to each other. This solution only improves the stirring and filtering components in the reaction filtration device 2. Other existing equipment components, such as the methanesulfonyl fluoride condenser 4 and the methanesulfonyl fluoride storage tank 5 listed above, are not described in detail. The reaction filtration device 2 consists of a tank and a cover that are threadedly connected to each other to facilitate disassembly and assembly.

[0033] The bottom of the reaction filtration device 2 is equipped with a filter assembly. The bottom of the tank is provided with a discharge pipe 15 through the discharge port 14. A filter screen 16 is provided inside the discharge pipe 15. A movable channel 18 is provided on the discharge pipe 15. A slide rod 20 is fixedly provided on the inner wall of the movable channel 18. A top plate 19 connected to the filter screen 16 is slidably sleeved on the outer wall of the slide rod 20 through a reset mechanism. A rotating motor 22 is fixedly provided on the inner wall of the movable channel 18. The rotating motor 22 cooperates with the top plate 19 through a lifting mechanism.

[0034] The reset mechanism includes a reset spring 21 sleeved on the outside of the slide rod 20. The two ends of the reset spring 21 are elastically connected to the outer wall of the top plate 19 and the inner wall of the movable channel 18, respectively. The reset spring 21 can be reset by the top plate 19 driving the filter screen 16 to descend and reset when the cam 23 does not press the top plate 19. The end of the slide rod 20 is fixedly provided with an impact block. The top plate 19 and the impact block can also collide to generate vibration. The vibration is transmitted to the filter screen 16 and can shake out the blockage in the mesh.

[0035] The lifting mechanism includes a cam 23 connected to the output shaft of the rotating motor 22. The bottom wall of the top plate 19 is provided with a pressing groove 24 corresponding to the cam 23. The cam 23, in conjunction with the pressing groove 24, can periodically lift the top plate 19. At the same time, a baffle 17 is fixedly provided on the outer wall of the top plate 19 to achieve the blocking operation of the movable channel 18.

[0036] The reaction filtration device 2 is equipped with a stirring assembly, which includes a stirring shaft 8 rotatably connected to the bottom wall of the cover body. The upper end face of the cover body 1 is equipped with a stirring motor 9 connected to the stirring shaft 8. The outer wall of the stirring shaft 8 is equipped with multiple stirring rods 11. The outer wall of the stirring shaft 8 is also equipped with a jacket 12. The jacket 12 is equipped with an installation ring 25 through a limiting mechanism. A water pipe 13 connected to the pump body passes through the installation ring 25.

[0037] The limiting mechanism includes a limiting ring 26 fixedly installed on the outer wall of the mounting ring 25. The inner wall of the jacket 12 is provided with a limiting groove 27 corresponding to the limiting ring 26. The mounting ring 25 and the water pipe 13 will not rotate with the jacket 12 and the stirring shaft 8. The pump body can send cold water into the jacket 12 and extract it after a period of heat exchange and cooling. The water pipe 13 extends to the bottom of the jacket 12.

[0038] The tank body is equipped with a support mechanism corresponding to the stirring shaft 8. The support mechanism includes a support frame 10 set inside the tank body. The upper end face of the support frame 10 is provided with a support groove that cooperates with the stirring shaft 8. The support frame 10 is composed of a plate and multiple branch legs, which minimizes the impact on material feeding. At the same time, the support frame 10 is set to ensure the rotational stability of the stirring shaft 8.

[0039] Example 2

[0040] A method for preparing methanesulfonyl fluoride includes the following steps:

[0041] S1. Addition process: Add sodium fluoride and ethylene glycol to the reaction filter, and then add methanesulfonyl chloride dropwise to the reaction filter;

[0042] S2. Filtration: Filter the product after the reaction in step S1, and leave the excess sodium fluoride in the reaction filter for reuse next time.

[0043] S3. Distillation treatment: The filtrate is distilled and dried. During the distillation and drying process, the solid material obtained by evaporation includes sodium chloride, and the liquid material obtained by distillation and condensation includes methanesulfonyl fluoride and ethylene glycol. The ethylene glycol is recovered and recycled.

[0044] The preparation method of methanesulfonyl fluoride specifically includes the following steps:

[0045] Sodium fluoride and ethylene glycol were added to reaction filtration device 2, and then methanesulfonyl chloride was added dropwise to reaction filtration device 2. The weight ratio of sodium fluoride to ethylene glycol was 1:1.1, and the molar ratio of methanesulfonyl chloride to sodium fluoride was 1:1.1. The reaction temperature was maintained at 20°C, the reaction pressure was 0 MPa, and the reaction time was 5 h.

[0046] After the reaction, the product is filtered through filter screen 16. Excess sodium fluoride is retained in the reaction filtration device 2 for reuse. The filtrate enters the distillation drying device 3 to distill methanesulfonyl fluoride as the product material. The distillation conditions are -0.1 MPa and the distillation temperature of the collected methanesulfonyl fluoride is 40°C. After the methanesulfonyl fluoride is condensed into liquid by the methanesulfonyl fluoride condenser 4, it is stored in the methanesulfonyl fluoride storage tank 5. Then, the product is further distilled and condensed to recover ethylene glycol. The recovered ethylene glycol is stored in the ethylene glycol storage tank 7 and can be recycled. The material in the distillation drying device 3 is evaporated to obtain sodium chloride as a solid. Sodium chloride is collected as a by-product. The weight percentage of methanesulfonyl fluoride obtained is 99.92%. The water content in the product is ≤0.01%, and the ethylene glycol content is ≤0.005%.

[0047] The method provided by this invention can avoid the hydrolysis of methanesulfonyl fluoride by selecting an organic solvent, and can achieve the separation of sodium fluoride and sodium chloride without generating waste, thereby improving the reaction yield, reducing production costs, and facilitating industrial production.

[0048] Example 3

[0049] A method for preparing methanesulfonyl fluoride specifically includes the following steps:

[0050] Sodium fluoride and ethylene glycol were added to reaction filtration device 2, and then methanesulfonyl chloride was added dropwise to reaction filtration device 2. The weight ratio of sodium fluoride to ethylene glycol was 1:1.15, and the molar ratio of methanesulfonyl chloride to sodium fluoride was 1:1.15. The reaction temperature was maintained at 50°C, the reaction pressure was 0.002 MPa, and the reaction time was 3 hours.

[0051] After the reaction, the product is filtered through filter screen 16. Excess sodium fluoride is retained in the reaction filtration device 2 for reuse. The filtrate enters the distillation drying device 3 to distill methanesulfonyl fluoride as the product material. The distillation conditions are -0.09 MPa and the distillation temperature of the collected methanesulfonyl fluoride is 75°C. After the methanesulfonyl fluoride is condensed into liquid by the methanesulfonyl fluoride condenser 4, it is stored in the methanesulfonyl fluoride storage tank 5. Then, it is further distilled and condensed to recover ethylene glycol. The ethylene glycol is recovered and stored in the ethylene glycol storage tank 7. The recovered ethylene glycol can be recycled. The material in the distillation drying device 3 is evaporated to obtain sodium chloride as a solid. Sodium chloride is collected as a by-product. The weight percentage of methanesulfonyl fluoride obtained is 99.94%. The water content in the product is ≤0.01%, and the ethylene glycol content is ≤0.005%.

[0052] Example 4

[0053] A method for preparing methanesulfonyl fluoride specifically includes the following steps:

[0054] Sodium fluoride and ethylene glycol were added to reaction filtration device 2, and then methanesulfonyl chloride was added dropwise to reaction filtration device 2. The weight ratio of sodium fluoride to ethylene glycol was 1:1.05, and the molar ratio of methanesulfonyl chloride to sodium fluoride was 1:1.05. The reaction temperature was maintained at 40°C, the reaction pressure was 0.001 MPa, and the reaction time was 6 h.

[0055] After the reaction, the product is filtered through filter screen 16. Excess sodium fluoride is retained in the reaction filtration device 2 for reuse. The filtrate enters the distillation drying device 3 to distill methanesulfonyl fluoride as the product material. The distillation conditions are -0.08 MPa and the distillation temperature of the collected methanesulfonyl fluoride is 55℃. After the methanesulfonyl fluoride is condensed into liquid by the methanesulfonyl fluoride condenser 4, it is stored in the methanesulfonyl fluoride storage tank 5. Then, it is further distilled and condensed to recover ethylene glycol. The ethylene glycol is recovered and stored in the ethylene glycol storage tank 7. The recovered ethylene glycol can be recycled. The material in the distillation drying device 3 is evaporated to obtain sodium chloride as a solid. Sodium chloride is collected as a by-product. The weight percentage of methanesulfonyl fluoride obtained is 99.92%. The water content in the product is ≤0.01%, and the ethylene glycol content is ≤0.005%.

[0056] Comparative Example 1

[0057] A method for preparing methanesulfonyl fluoride uses a reactor without a filtration device as the reaction apparatus. The remaining apparatus is identical, including: a methanesulfonyl chloride metering tank 1, a reactor, a distillation and drying apparatus 3, a methanesulfonyl fluoride condenser 4, a methanesulfonyl fluoride storage tank 5, an ethylene glycol condenser 6, and an ethylene glycol storage tank 7. The specific preparation method includes the following steps:

[0058] Sodium fluoride and ethylene glycol were added to the reactor, and then methanesulfonyl chloride was added dropwise to the reactor. The weight ratio of sodium fluoride to ethylene glycol was 1:1.1, and the molar ratio of methanesulfonyl chloride to sodium fluoride was 1:1.1. The reaction temperature was maintained at 20°C, the reaction pressure was 0 MPa, and the reaction time was 5 h.

[0059] After the reaction is completed, the product is sent to the distillation and drying device 3 to distill methylsulfonyl fluoride as the product material. The distillation conditions are pressure -0.1MPa and the distillation temperature of the collected methylsulfonyl fluoride is 40℃. After passing through the methylsulfonyl fluoride condenser 4, the methylsulfonyl fluoride is stored in the methylsulfonyl fluoride storage tank 5. Then, the product is further distilled and condensed to recover ethylene glycol. The ethylene glycol is recovered and stored in the ethylene glycol storage tank 7. The recovered ethylene glycol can be recycled.

[0060] The material in the distillation and drying device 3 is evaporated to obtain solids, namely sodium chloride generated in the reaction and sodium fluoride that has not been completely reacted. Sodium chloride and sodium fluoride are not easy to separate and the separation cost is high. They can only be used as solid waste and cannot be collected as by-products. The weight percentage of the obtained methanesulfonyl fluoride is 99.3%, and the purity of methanesulfonyl fluoride is significantly reduced.

[0061] The comparative analysis shows that by setting up a filtration device, sodium chloride and sodium fluoride can be separated, thereby achieving the recovery of sodium fluoride. Sodium fluoride can be returned to the reaction filtration device for reuse, avoiding the problem of sodium fluoride being difficult to separate from sodium chloride. This improves the yield and purity of the product methanesulfonyl fluoride, demonstrating the specificity of the filtration device in the production process of this product. At the same time, it reduces the generation of waste and environmental pollution, lowers industrial production costs, and is conducive to large-scale industrial production.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An apparatus for preparing methanesulfonyl fluoride, comprising a methanesulfonyl chloride metering tank (1), a reaction filtration device (2), and a distillation apparatus. The drying device (3), the methanesulfonyl fluoride condenser (4), the methanesulfonyl fluoride storage tank (5), the ethylene glycol condenser (6), and the ethylene glycol storage tank (7) are characterized in that, The methanesulfonyl chloride metering tank (1), reaction filtration device (2), and distillation drying device (3) are connected in sequence. The distillation drying device (3) has a methanesulfonyl fluoride condenser (4) and an ethylene glycol condenser (6) connected to its upper outlet. A methanesulfonyl fluoride storage tank (5) is connected below the methanesulfonyl fluoride condenser (4), and an ethylene glycol storage tank (7) is connected below the ethylene glycol condenser (6). The reaction filtration device (2) consists of a tank body and a cover. A stirring assembly is installed inside the reaction filtration device (2). The bottom of the body is provided with a discharge pipe (15) through the discharge port (14). The discharge pipe (15) is provided with a filter screen (16). The discharge pipe (15) is provided with a movable channel (18). The inner wall of the movable channel (18) is fixedly provided with a slide rod (20). The outer wall of the slide rod (20) is slidably sleeved with a top plate (19) connected to the filter screen (16) through a reset mechanism. The inner wall of the movable channel (18) is fixedly provided with a rotating motor (22). The rotating motor (22) cooperates with the top plate (19) through a lifting mechanism. The reset mechanism includes a reset spring (21) sleeved on the outside of the slide bar (20), and the two ends of the reset spring (21) are elastically connected to the outer wall of the top plate (19) and the inner wall of the movable channel (18), respectively. The lifting mechanism includes a cam (23) connected to the output shaft of a rotating motor (22), and the bottom wall of the top plate (19) is provided with a pressing groove (24) corresponding to the cam (23).

2. The apparatus for preparing methanesulfonyl fluoride according to claim 1, characterized in that, The stirring assembly includes: a stirring shaft (8) rotatably mounted on the bottom wall of the cover; a stirring motor (9) connected to the stirring shaft (8) mounted on the upper surface of the cover; multiple stirring rods (11) mounted on the outer wall of the stirring shaft (8); a jacket (12) mounted on the outer wall of the stirring shaft (8); an installation ring (25) mounted on the jacket (12) via a limiting mechanism; a water pipe (13) connected to the pump body passing through the installation ring (25); and a support mechanism corresponding to the stirring shaft (8) mounted inside the tank.

3. The apparatus for preparing methanesulfonyl fluoride according to claim 2, characterized in that, The limiting mechanism includes a limiting ring (26) fixedly disposed on the outer wall of the mounting ring (25), and the inner wall of the sleeve (12) is provided with a limiting groove (27) corresponding to the limiting ring (26).

4. The apparatus for preparing methanesulfonyl fluoride according to claim 2, characterized in that, The support mechanism includes a support frame (10) disposed inside the tank body, and the upper end face of the support frame (10) is provided with a support groove that cooperates with the stirring shaft (8).

5. A method for preparing methanesulfonyl fluoride, based on the apparatus for preparing methanesulfonyl fluoride according to any one of claims 1 to 4, characterized in that, Includes the following steps: S1. Addition process: Add sodium fluoride and ethylene glycol to the reaction filtration device, and then add methanesulfonyl chloride dropwise to the reaction filtration device; S2. Filtration: Filter the product after the reaction in step S1, and leave the excess sodium fluoride in the reaction filtration device for reuse next time. S3. Distillation treatment: The filtrate is distilled and dried. During the distillation and drying process, the solid material obtained by evaporation includes sodium chloride, and the liquid material obtained by distillation and condensation includes methanesulfonyl fluoride and ethylene glycol. The ethylene glycol is recovered and recycled.

6. The method for preparing methanesulfonyl fluoride according to claim 5, characterized in that, The weight ratio of sodium fluoride to ethylene glycol is 1:(1.05~1.15), and the molar ratio of methanesulfonyl chloride to sodium fluoride is 1:(1.05~1.15).

7. The method for preparing methanesulfonyl fluoride according to claim 5, characterized in that, In step S1, the reaction temperature of sodium fluoride, ethylene glycol and methanesulfonyl chloride is 20-50℃, the reaction pressure is 0-0.002MPa, and the reaction time is 3-6h.

8. The method for preparing methanesulfonyl fluoride according to claim 5, characterized in that, The distillation pressure during the distillation and drying process is -0.1 to -0.08 MPa, and the temperature at which the methanesulfonyl fluoride material is collected is 40 to 75°C.

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