Equipment and method for preparing methyl trifluoroacetoacetate

Abstract

This invention relates to the field of distillation equipment technology, specifically to a device and method for preparing methyl trifluoroacetoacetate. The device includes a distillation mechanism comprising a workbench, a distillation kettle, an annular plate, an electromagnetic induction heating coil, spheres a and b, tubes a and b, an externally threaded tube, and an aeration valve. The distillation kettle is positioned on the workbench; the annular plate surrounds the outside of the distillation kettle; the electromagnetic induction heating coil is located inside the annular plate; the externally threaded tube is located at the bottom of the distillation kettle; tube a is rotatably positioned inside the externally threaded tube; one end of tube a extends into the distillation kettle and connects to sphere a; the other end of tube a extends below the workbench; multiple tubes b are evenly distributed on the surface of spheres a; the aeration valve is connected to one end of tube b; multiple spheres b are evenly distributed on tube b. This invention utilizes discrete spheres b to uniformly heat the liquid from within, which can greatly eliminate temperature gradients and avoid coking on the kettle wall.

Description

Technical Field

[0001] This invention relates to the field of distillation equipment technology, and specifically to an apparatus and method for preparing methyl trifluoroacetoacetate. Background Technology

[0002] Methyl trifluoroacetoacetate is an extremely important and multifunctional fluorinated organic synthesis intermediate. Its preparation method involves adding methyl trifluoroacetate to a reaction flask, adding alkali and methyl acetate dropwise. After the reaction is complete, the solvent is evaporated, solvent is added, acidified with acid, and the product is crudely distilled off, followed by fractional distillation.

[0003] Existing distillation equipment typically employs a heating method that transitions from "wall heating" to "volume heating," where heat is transferred from the jacket or coil and conducted through the vessel wall and liquid. However, the temperature is highest at the contact point between the vessel wall and the packing, making it highly susceptible to localized decomposition and coking of heat-sensitive materials. Furthermore, high-boiling-point organic compounds with a certain degree of polarity and viscosity, such as methyl trifluoroacetoacetate, are more prone to condensation, supercooling, or even solidification on the relatively cooler wall surface (even with insulation, the wall temperature is often lower than the internal gas phase temperature) as the concentration increases in the later stages of distillation. Products solidified on the wall surface generally have strong adhesion, making them difficult to clean and affecting product recovery efficiency. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the background art by proposing a device and method for preparing methyl trifluoroacetoacetate.

[0005] The technical solution of the present invention: a device for preparing methyl trifluoroacetoacetate, comprising: A distillation mechanism includes a worktable, a distillation kettle, an annular plate, an electromagnetic induction heating coil, spheres a and b, tubes a and b, an externally threaded tube, an aeration valve, and a motor. The distillation kettle is located on the worktable. The annular plate is fitted around the outside of the distillation kettle. The electromagnetic induction heating coil is located inside the annular plate. The externally threaded tube is located at the bottom of the distillation kettle. Tube a is rotatably located inside the externally threaded tube. One end of tube a extends into the interior of the distillation kettle and is connected to sphere a. The other end of tube a extends below the worktable. Multiple tubes b are provided and evenly distributed on the surface of sphere a. An aeration valve is connected to one end of tube b. Multiple spheres b are provided and evenly distributed on tube b. The motor is located on the worktable and is connected to the drive of tube a. The cooling mechanism, which is connected to the distillation vessel, is used to cool and liquefy the evaporated steam.

[0006] Preferably, sphere a is a hollow structure; tubes a and b are connected to sphere a; multiple holes are provided on the side wall of tube b; and air vents are provided inside sphere b that are connected to the holes.

[0007] Preferably, a high-pressure gas tank is provided on the workbench; the outlet end of the high-pressure gas tank is connected to pipe c; one end of pipe c is rotatably connected to one end of pipe a; the high-pressure gas tank contains nitrogen.

[0008] Preferably, the outer surfaces of tube a, sphere b, and sphere a are all covered with an elastic membrane.

[0009] Preferably, a gear a is connected to pipe a; a gear b is connected to the output end of the motor; gear b meshes with gear a.

[0010] Preferably, the distillation vessel is provided with a pipe d for adding liquid into the distillation vessel; the pipe d is provided with a sealing plug.

[0011] Preferably, the bottom of the distillation vessel is provided with multiple discharge ports; the bottom of the distillation vessel is provided with an annular groove; a sealing cover is provided below the distillation vessel; the sealing cover is provided with a sealing block inserted into the discharge port and a sealing ring inserted into the annular groove; and an internally threaded pipe connected to the sealing cover is connected to the externally threaded pipe.

[0012] Preferably, the cooling mechanism includes a water tank, a spiral tube, and a connecting pipe; the water tank is located on the workbench; the spiral tube is located inside the water tank and both ends of it are connected to and pass through the water tank; one end of the connecting pipe is connected to the spiral tube, and the other end of the connecting pipe is connected to the distillation kettle; the water tank is provided with an inlet pipe and an outlet pipe.

[0013] This invention also proposes a method for preparing methyl trifluoroacetoacetate, using the aforementioned methyl trifluoroacetoacetate preparation equipment, comprising the following steps: S1. Add raw materials: Open the sealing plug on tube d, add the prepared liquid raw materials into the distillation vessel through tube d, and then cover with the sealing plug; place the recovery container at the bottom of the spiral tube; S2. Distillation Operation: The electromagnetic induction heating coil, high-pressure gas tank, and motor are turned on. The motor drives the sphere b to rotate and stir the raw materials. At the same time, the electromagnetic induction heating coil generates eddy currents in the sphere b, converting electrical energy into heat energy, causing the sphere b to heat up. The heat is generated directly and uniformly from the inside of the liquid, realizing "volume heating". This greatly eliminates the temperature gradient, avoids local overheating, reduces the heat loss through the vessel wall, and improves the distillation efficiency. The high-pressure gas tank fills the inside of the sphere b with nitrogen gas, which is then sprayed out through the aeration valve. The generated bubbles can produce a slight stirring and scouring effect on the vessel wall. The steam generated by distillation enters the inner side of the spiral tube through the connecting pipe and exchanges heat with the cold water in the water tank. After the steam condenses, it forms droplets that fall into the recovery vessel for recovery. S3. Raw Material Recovery and Cleaning: After distillation, close the aeration valve. Nitrogen gas can only be discharged through the pores inside sphere b, causing the elastic membrane to suddenly expand. When the elastic membrane expands, its local curvature changes. Simultaneously, due to the continuous rotation of sphere b, residual droplets can be thrown away from the elastic membrane. Then, open the aeration valve to allow the gas inside the elastic membrane to spray out. The sprayed gas sweeps the inner wall of the distillation vessel, and the droplets thrown onto the vessel wall, as well as the residual droplets on the vessel wall, are swept through the outlet to the inside of the sealing cap for recovery. Finally, by rotating the internal threaded tube, the sealing cap is moved down. The staff can then recover the product in the sealing cap.

[0014] Compared with the prior art, the above-mentioned technical solution of the present invention has the following beneficial technical effects: By incorporating a distillation mechanism, multiple discretely distributed spheres b are placed inside the distillation vessel. Under the action of an electromagnetic induction heating coil, the spheres b heat up. The spheres b, evenly distributed in the distillation vessel, become countless miniature heating sources scattered within the liquid. Heat is generated directly and uniformly from within the liquid, achieving "volume heating." This greatly eliminates temperature gradients and avoids localized overheating. Furthermore, the heat is generated directly within the raw material, reducing thermal resistance loss through the vessel wall, resulting in higher thermal efficiency. At the same time, it avoids coking on the vessel wall, reducing cleaning difficulty.

[0015] By using a high-pressure gas tank, pipe b, and aeration valve, nitrogen gas is sprayed out from the high-pressure gas tank and then sprayed out through the aeration valve, thereby generating bubbles in the liquid raw material. The continuous flow of bubbles can generate a slight agitation and scouring effect on the reactor wall during its upward process, which helps to prevent high-viscosity materials from adhering stably to the wall surface. Attached Figure Description

[0016] Figure 1 A three-dimensional representation of an embodiment of the present invention Figure 1 ; Figure 2 A three-dimensional representation of an embodiment of the present invention Figure 2 ; Figure 3 This is a cross-sectional structural diagram of an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of sphere a, sphere b, tube b, and tube a in one embodiment of the present invention; Figure 5 for Figure 4 Enlarged structural diagram at point A in the middle; Figure 6 for Figure 4 Enlarged structural diagram at point B; Figure 7 This is a schematic diagram of the sealing cap structure in one embodiment of the present invention.

[0017] Reference numerals: 1. Workbench; 2. Distillation vessel; 201. Discharge port; 202. Annular groove; 3. Pipe d; 4. Sphere a; 5. Externally threaded pipe; 6. Sealing cap; 7. Sealing block; 8. Motor; 9. High-pressure gas tank; 10. Connecting pipe; 11. Water tank; 1101. Inlet pipe; 1102. Outlet pipe; 12. Spiral pipe; 13. Annular plate; 14. Electromagnetic induction heating coil; 15. Pipe c; 16. Gear b; 17. Gear a; 18. Pipe a; 19. Sphere b; 1901. Air hole; 20. Pipe b; 21. Aeration valve; 22. Internally threaded pipe; 23. Sealing ring; 24. Elastic membrane. Detailed Implementation

[0018] Example 1, as Figures 1-7 As shown, the present invention provides a methyl trifluoroacetoacetate preparation apparatus, which includes a distillation mechanism and a cooling mechanism; The distillation mechanism includes a workbench 1, a distillation vessel 2, an annular plate 13, an electromagnetic induction heating coil 14, spheres a4 and b19, tubes a18 and b20, an externally threaded tube 5, an aeration valve 21, and a motor 8. The distillation vessel 2 is mounted on the workbench 1. A tube d3 for adding liquid into the distillation vessel 2 is provided on the distillation vessel 2. A sealing plug is provided on the tube d3. The annular plate 13 is fitted over the outside of the distillation vessel 2. The electromagnetic induction heating coil 14 is located inside the annular plate 13 (the electromagnetic induction heating coil 14 uses electromagnetic induction to generate eddy currents in the sphere b19, converting electrical energy into heat energy). The externally threaded tube 5 is located at the bottom of the distillation vessel 2. Tube a18 is rotatably located inside the externally threaded tube 5. One end of tube a18 extends into the distillation vessel 2 and... Connected to sphere a4; the other end of tube a18 extends below workbench 1; multiple tubes b20 are provided and evenly distributed on the surface of sphere a4; sphere a4 is a hollow structure; tubes a18 and b20 are connected to sphere a4; multiple holes are opened on the side wall of tube b20; vents 1901 communicating with the holes are opened inside sphere b19; the outer surfaces of tubes a18, sphere b19, and sphere a4 are all covered with an elastic membrane 24 (the elastic membrane 24 is made of filled fluororubber, which has good thermal conductivity and elasticity, can absorb the heat of sphere b19 and conduct it to the liquid raw material, with an upper temperature limit between 200℃ and 250℃; the filled fluororubber has good chemical stability and is resistant to most oils). (Class, acid, alkali); Aeration valve 21 is connected to one end of pipe b20 (the surface of aeration valve 21 is coated with a sol-gel coating, which has acid resistance, corrosion resistance and high temperature oxidation resistance); Multiple balls b19 are provided and evenly distributed on pipe b20 (balls b19 are made of stainless steel (such as 316L) and other materials, which have good chemical inertness), and multiple balls b19 are evenly distributed inside the distillation kettle 2; Motor 8 is located on the workbench 1 and is connected to pipe a18 for transmission; Gear a17 is connected to pipe a18; Gear b16 is connected to the output end of motor 8; Gear b16 meshes with gear a17; Multiple discharge ports 201 are opened at the bottom end of distillation kettle 2; An annular groove 202 is opened at the bottom end of distillation kettle 2; Distillation A sealing cover 6 is provided below the distillation vessel 2 (the bottom of the sealing cover 6 is provided with multiple liquid outlet pipes, and the liquid outlet pipes are provided with valves); the sealing cover 6 is provided with a sealing block 7 inserted into the discharge port 201 and a sealing ring 23 inserted into the annular groove 202 (the sealing ring 23 and the annular groove 202 are inserted to enhance the sealing between the sealing cover 6 and the distillation vessel 2; the sealing block 7 and the discharge port 201 are inserted to realize the sealing function of the discharge port 201, ensuring that the distillation operation of the distillation vessel 2 can proceed normally); an internal threaded pipe 22 is connected to the sealing cover 6 and is threaded to the external threaded pipe 5; a high-pressure gas tank 9 is provided on the workbench 1; the outlet end of the high-pressure gas tank 9 is connected to a pipe c15; one end of the pipe c15 is rotatably connected to one end of the pipe a18; the high-pressure gas tank 9 contains nitrogen; The cooling mechanism is connected to the distillation vessel 2 and is used to cool and liquefy the evaporated steam.

[0019] In this embodiment, the proportioned liquid raw material is added to the distillation vessel 2 through pipe d3. Then, the electromagnetic induction heating coil 14 is turned on. The electromagnetic induction heating coil 14 generates eddy currents in the sphere b19 using electromagnetic induction, converting electrical energy into heat energy, causing the sphere b19 to heat up, thus achieving the heating function of the raw material. The spheres b19, evenly distributed in the distillation vessel 2, become countless micro-heating sources dispersed within the liquid. Heat is generated directly and uniformly from within the liquid, achieving "volume heating," which can greatly eliminate temperature gradients and avoid local overheating. Furthermore, heat is generated directly within the raw material, reducing thermal resistance loss through the vessel wall, resulting in higher thermal efficiency. It also avoids coking on the vessel wall, reducing cleaning difficulty. Simultaneously with distillation, the electromagnetic induction heating coil 14 is turned on... Machine 8, motor 8 drives gear b16 to rotate, gear b16 drives gear a17 to rotate, gear a17 drives tube a18 to rotate, tube a18 drives sphere a4 to rotate, and sphere a4 drives tube b20 to rotate, which can stir and mix the raw materials. At the same time, the aeration valve 21 and the pressure reducing valve on the high-pressure gas tank 9 are opened by the external controller. Nitrogen gas inside the high-pressure gas tank 9 enters sphere a4 through tube a18. Finally, it enters tube b20 and is sprayed out through aeration valve 21, thereby generating bubbles in the liquid raw materials. The continuous bubble flow can generate a slight stirring and scouring effect on the vessel wall during the rising process, which helps to prevent high viscosity materials from adhering stably to the wall surface. The steam generated during the distillation process enters the cooling mechanism, and is recovered after being cooled and liquefied.

[0020] After distillation, by rotating the internal threaded tube 22, the sealing cap 6 is moved downward (the internal threaded tube 22 and the external threaded tube 5 are not separated), causing the sealing block 7 to separate from the outlet 201, and at the same time, the sealing ring 23 to separate from the annular groove 202, allowing the product to flow out through the outlet 201 and fall onto the sealing cap 6. The staff can then collect the product in the sealing cap 6 by opening the valve on the liquid outlet pipe. Furthermore, since the sealing cap 6 is in an open state, it is convenient for the staff to clean it, and the staff's cleaning tools can also be inserted into the interior of the distillation vessel 2 through the outlet 201, which facilitates the cleaning of the interior of the distillation vessel 2.

[0021] It should be noted that before the sealing cap 6 separates from the distillation vessel 2, the aeration valve 21 is closed via an external controller while the sphere a4 continues to rotate. When the aeration valve 21 is closed, the nitrogen gas entering the pipe b20 can only be discharged through the pores 1901 inside the sphere b19, causing the elastic membrane 24 to suddenly expand. As the elastic membrane 24 expands, its local curvature changes, generating surface strain. Droplets adhering to the membrane "pin" the underlying local area, restricting its deformation. When the surrounding area expands, the strain energy of the pinned area increases, forming an energy gradient. The system tends to transition to a lower energy state. The droplets remaining on the surface of the elastic membrane 24 are "pushed" or "pulled" towards areas with lower strain energy (usually flatter, more fully expanded areas), thus beginning to slide. Due to the continuous rotation of the sphere a4, the droplets remaining on the surface of the elastic membrane 24 have a certain centrifugal force, which can throw the droplets away from the elastic membrane 24. Then, the aeration valve 21 is opened, causing the gas inside the elastic membrane 24 to be ejected. The ejected gas sweeps the inner wall of the distillation vessel 2, and the droplets thrown onto the vessel wall and the droplets remaining on the vessel wall are swept through the discharge port 201 to the inside of the sealing cover 6 for recycling, ensuring sufficient product recycling.

[0022] Example 2, as Figure 3 As shown, the present invention proposes a methyl trifluoroacetoacetate preparation device. Compared with Embodiment 1, this embodiment also details the structure of the cooling mechanism. The cooling mechanism includes a water tank 11, a spiral tube 12, and a connecting pipe 10. The water tank 11 is located on the workbench 1 (the water tank 11 contains cold water). The spiral tube 12 is located inside the water tank 11 and both ends are connected to and pass through the water tank 11. One end of the connecting pipe 10 is connected to the spiral tube 12, and the other end of the connecting pipe 10 is connected to the distillation kettle 2. The water tank 11 is provided with an inlet pipe 1101 and an outlet pipe 1102 (both the inlet pipe 1101 and the outlet pipe 1102 are equipped with valves).

[0023] In this embodiment, the worker places the recycling container (not shown in the figure) at the bottom of the spiral tube 12. The steam generated by distillation enters the inner side of the spiral tube 12 through the connecting pipe 10 and exchanges heat with the cold water in the water tank 11. After the steam condenses, it forms droplets that fall into the recycling container for recycling.

[0024] It should be noted that when it is necessary to change the water in the water tank 11, the valve on the outlet pipe 1102 can be opened to drain the water in the water tank 11, and then the valve on the inlet pipe 1101 can be opened to refill the water tank 11 with cold water.

[0025] Example 3, please refer to Figures 1-7 The present invention also proposes a method for preparing methyl trifluoroacetoacetate, using the methyl trifluoroacetoacetate preparation equipment described in any of Examples 1 to 2 above, comprising the following steps: S1. Add raw materials: Open the sealing plug on tube d3, add the prepared liquid raw materials into distillation vessel 2 through tube d3, and then cover with the sealing plug; place the recovery container at the bottom of spiral tube 12; S2. Distillation Operation: The electromagnetic induction heating coil 14, high-pressure gas tank 9, and motor 8 are turned on. The motor 8 drives the sphere b19 to rotate and stir the raw materials. At the same time, the electromagnetic induction heating coil 14 generates eddy currents in the sphere b19, converting electrical energy into heat energy, causing the sphere b19 to heat up. The heat is generated directly and uniformly from the inside of the liquid, realizing "volume heating". This greatly eliminates the temperature gradient and avoids local overheating, reduces the heat loss through the vessel wall, and improves the distillation efficiency. The high-pressure gas tank 9 fills the sphere b19 with nitrogen gas, which is then sprayed out through the aeration valve 21. The generated bubbles can produce a slight stirring and scouring effect on the vessel wall. The steam generated by distillation enters the inner side of the spiral tube 12 through the connecting pipe 10 and exchanges heat with the cold water in the water tank 11. After the steam condenses, it forms droplets that fall into the recovery vessel for recovery. S3. Raw Material Recovery and Cleaning: After distillation, close the aeration valve 21. Nitrogen gas can only be discharged through the pores 1901 inside the sphere b19, causing the elastic membrane 24 to suddenly expand. When the elastic membrane 24 expands, its local curvature changes. At the same time, due to the continuous rotation of the sphere b19, the residual droplets can be thrown away from the elastic membrane 24. Then, open the aeration valve 21 to allow the gas inside the elastic membrane 24 to spray out. The sprayed gas sweeps the inner wall of the distillation vessel 2, and the droplets thrown onto the vessel wall and the residual droplets on the vessel wall are swept through the discharge port 201 to the inside of the sealing cover 6 for recovery. Finally, by rotating the internal threaded tube 22, the sealing cover 6 is moved down. The staff can then recover the product in the sealing cover 6.

[0026] In summary, the prepared liquid raw material is added to the distillation vessel 2 through pipe d3. Then, the electromagnetic induction heating coil 14 is activated. The electromagnetic induction heating coil 14 generates eddy currents in the sphere b19 using electromagnetic induction, converting electrical energy into heat energy, causing the sphere b19 to heat up. This achieves the heating function of the raw material. The spheres b19, evenly distributed throughout the distillation vessel 2, become countless micro-heating sources dispersed within the liquid. Heat is generated directly and uniformly from within the liquid, achieving "volume heating," which can greatly eliminate temperature gradients and avoid localized overheating. Furthermore, the heat is generated directly within the liquid raw material, reducing thermal resistance loss through the vessel wall, resulting in higher thermal efficiency. Simultaneously, it avoids coking on the vessel wall, reducing costs. Cleaning difficulty: During distillation, motor 8 is turned on, which drives gear b16 to rotate, gear b16 drives gear a17 to rotate, gear a17 drives tube a18 to rotate, tube a18 drives sphere a4 to rotate, and sphere a4 drives tube b20 to rotate, which can stir and mix the raw materials. At the same time, the aeration valve 21 and the pressure reducing valve on the high-pressure gas tank 9 are opened by the external controller. Nitrogen gas inside the high-pressure gas tank 9 enters sphere a4 through tube a18. Finally, it enters tube b20 and is sprayed out through aeration valve 21, thereby generating bubbles in the liquid raw materials. The continuous bubble flow can generate a slight stirring and scouring effect on the vessel wall during the rising process, which helps to prevent high viscosity materials from adhering stably on the wall surface.

[0027] Before distillation, the staff places the recovery vessel (not shown in the figure) at the bottom of the spiral tube 12. The steam generated by distillation enters the inner side of the spiral tube 12 through the connecting pipe 10 and exchanges heat with the cold water in the water tank 11. After the steam condenses, it forms droplets that fall into the recovery vessel for recycling.

[0028] After distillation, before the sealing cap 6 separates from the distillation vessel 2, the aeration valve 21 is closed via an external controller while the sphere a4 continues to rotate. When the aeration valve 21 is closed, the nitrogen gas entering the pipe b20 can only exit through the pores 1901 inside the sphere b19, causing the elastic membrane 24 to suddenly expand. As the elastic membrane 24 expands, its local curvature changes, generating surface strain. Droplets adhering to the membrane "pin" the underlying local area, restricting its deformation. When the surrounding area expands, the strain energy of the pinned area increases, forming an energy gradient. The system tends to move towards higher energy levels. The low state transition; the droplets remaining on the surface of the elastic membrane 24 will be "pushed" or "pulled" towards the area with lower strain energy (usually a flatter area with more full expansion), thus starting to slide. Due to the continuous rotation of the sphere a4, the droplets remaining on the surface of the elastic membrane 24 have a certain centrifugal force, which can throw the remaining droplets away from the elastic membrane 24. Then, the aeration valve 21 is opened, so that the gas inside the elastic membrane 24 is ejected. The ejected gas sweeps the inner wall of the distillation vessel 2, and the droplets thrown onto the vessel wall and the droplets remaining on the vessel wall are swept through the discharge port 201 to the inside of the sealing cover 6 for recycling.

[0029] Finally, by rotating the internal threaded tube 22, the sealing cover 6 is moved downward (the internal threaded tube 22 and the external threaded tube 5 are not separated), causing the sealing block 7 to separate from the outlet 201, and at the same time causing the sealing ring 23 to separate from the annular groove 202, so that the product flows out through the outlet 201 and falls onto the sealing cover 6. The staff can then collect the product in the sealing cover 6 by opening the valve on the liquid outlet pipe. Furthermore, since the sealing cover 6 is in an open state, it is convenient for the staff to clean it. At the same time, the staff's cleaning tools can also be inserted into the interior of the distillation vessel 2 through the outlet 201, which facilitates the cleaning of the interior of the distillation vessel 2.

[0030] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A device for preparing methyl trifluoroacetoacetate, characterized in that, include: The distillation mechanism includes a workbench (1), a distillation vessel (2), an annular plate (13), an electromagnetic induction heating coil (14), a ball a (4), a ball b (19), a tube a (18), a tube b (20), an externally threaded tube (5), an aeration valve (21), and a motor (8); the distillation vessel (2) is located on the workbench (1); the annular plate (13) is fitted around the outside of the distillation vessel (2); the electromagnetic induction heating coil (14) is located inside the annular plate (13); and the externally threaded tube (5) is located at the bottom of the distillation vessel (2). Pipe a (18) is rotatably located inside the externally threaded pipe (5); one end of pipe a (18) extends into the interior of the distillation vessel (2) and is connected to the sphere a (4); the other end of pipe a (18) extends to the bottom of the workbench (1); multiple pipes b (20) are provided and are evenly distributed on the surface of the sphere a (4); an aeration valve (21) is connected to one end of pipe b (20); multiple spheres b (19) are provided and are evenly distributed on pipe b (20); a motor (8) is located on the workbench (1) and is connected to pipe a (18) for transmission. The cooling mechanism is connected to the distillation vessel (2) and is used to cool and liquefy the evaporated steam.

2. The apparatus for preparing methyl trifluoroacetoacetate according to claim 1, characterized in that, Sphere a (4) is a hollow structure; tube a (18) and tube b (20) are connected to sphere a (4); multiple holes are opened on the side wall of tube b (20); pores (1901) are opened inside sphere b (19) and are connected to the holes.

3. The apparatus for preparing methyl trifluoroacetoacetate according to claim 1, characterized in that, A high-pressure gas tank (9) is provided on the workbench (1); the outlet of the high-pressure gas tank (9) is connected to a pipe c (15); one end of the pipe c (15) is rotatably connected to one end of the pipe a (18); nitrogen is stored inside the high-pressure gas tank (9).

4. The apparatus for preparing methyl trifluoroacetoacetate according to claim 1, characterized in that, The outer surfaces of tube a (18), sphere b (19) and sphere a (4) are all covered with an elastic membrane (24).

5. The apparatus for preparing methyl trifluoroacetoacetate according to claim 1, characterized in that, Gear a (17) is connected to pipe a (18); gear b (16) is connected to the output end of motor (8); gear b (16) meshes with gear a (17).

6. The apparatus for preparing methyl trifluoroacetoacetate according to claim 1, characterized in that, The distillation vessel (2) is provided with a pipe d (3) for adding liquid into the distillation vessel (2); the pipe d (3) is provided with a sealing plug.

7. The apparatus for preparing methyl trifluoroacetoacetate according to claim 1, characterized in that, The bottom end of the distillation vessel (2) is provided with multiple discharge ports (201); the bottom end of the distillation vessel (2) is provided with an annular groove (202); a sealing cover (6) is provided below the distillation vessel (2); the sealing cover (6) is provided with a sealing block (7) inserted into the discharge port (201) and a sealing ring (23) inserted into the annular groove (202); the sealing cover (6) is connected with an internal threaded pipe (22) that is threaded to the external threaded pipe (5).

8. The apparatus for preparing methyl trifluoroacetoacetate according to claim 1, characterized in that, The cooling mechanism includes a water tank (11), a spiral tube (12), and a connecting pipe (10); the water tank (11) is located on the workbench (1); the spiral tube (12) is located inside the water tank (11) and both ends of the spiral tube are connected to and pass through the water tank (11); one end of the connecting pipe (10) is connected to the spiral tube (12), and the other end of the connecting pipe (10) is connected to the distillation kettle (2); the water tank (11) is provided with an inlet pipe (1101) and an outlet pipe (1102).

9. A method for preparing methyl trifluoroacetoacetate, using the methyl trifluoroacetoacetate preparation equipment according to any one of claims 2-8, characterized in that, Includes the following steps: S1. Add raw materials: Open the sealing plug on tube d (3), add the prepared liquid raw materials into the distillation kettle (2) through tube d (3), and then cover with the sealing plug; and place the recovery container at the bottom of the spiral tube (12); S2. Distillation operation: Turn on the electromagnetic induction heating coil (14), high-pressure gas tank (9) and motor (8). The motor (8) drives the sphere b (19) to rotate to stir and mix the raw materials. At the same time, the electromagnetic induction heating coil (14) generates eddy currents in the sphere b (19) to convert electrical energy into heat energy, so that the sphere b (19) heats up. The heat is generated directly and uniformly from the inside of the liquid, realizing "volume heating", which greatly eliminates the temperature gradient and avoids local overheating, reduces the heat resistance loss through the vessel wall, and improves the distillation efficiency. The high-pressure gas tank (9) fills the sphere b (19) with nitrogen gas, and finally sprays it out through the aeration valve (21). The generated bubbles can generate a slight stirring and scouring effect on the vessel wall. The steam generated by distillation enters the inner side of the spiral tube (12) through the connecting pipe (10) and exchanges heat with the cold water in the water tank (11). After the steam condenses, it forms droplets that fall into the recovery vessel for recovery. S3. Raw material recovery and cleaning: After distillation, close the aeration valve (21). Nitrogen gas can only be discharged through the pores (1901) inside the sphere b (19) and cause the elastic membrane (24) to expand suddenly. When the elastic membrane (24) expands, its local curvature changes. At the same time, due to the continuous rotation of the sphere b (19), the residual droplets can be thrown away from the elastic membrane (24). Then open the aeration valve (21) so that the gas inside the elastic membrane (24) is ejected. The ejected gas blows the inner wall of the distillation vessel (2) and blows the droplets thrown onto the vessel wall and the residual droplets on the vessel wall through the discharge port (201) to the inside of the sealing cover (6) for recovery. Finally, by rotating the internal threaded tube (22), the sealing cover (6) is moved down. The staff can then recover the product in the sealing cover (6).

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