Repeated rectification equipment for trimethylbromosilane production

Abstract

The invention discloses multiple rectification equipment for trimethylbromosilane production, and relates to the technical field of chemical production, the equipment comprises a reaction kettle body, a partition assembly and a partition plate are fixed in the reaction kettle body, the reaction kettle body is divided into a reaction area, a first-stage distillation area and a second-stage distillation area by the partition assembly and the partition plate, the partition assembly comprises a leakage net layer, a communication layer and a rate adjusting layer, the leakage net layer is arranged close to the reaction area, the rate adjusting layer is arranged close to the second-stage distillation layer, a condensation pipeline is inserted into the first-stage distillation area, the second-stage distillation area is communicated with a distillation leading-out pipeline, the distillation leading-out pipeline is inserted into the top of the reaction kettle body, and the second-stage distillation area is communicated with the second-stage distillation area. The end, away from the reaction kettle body, of the distillation leading-out pipeline is connected with a steam acceleration mechanism, and electric heating plates fixed outside the reaction kettle body are arranged at the positions corresponding to the reaction area and the second-stage distillation area; the equipment is high in overall integration, the equipment and labor cost is reduced, and the distillation efficiency can be effectively improved while the purity of trimethylbromosilane is improved.

Description

Technical Field

[0001] This invention belongs to the field of chemical production technology, and in particular relates to a multi-distillation apparatus for the production of trimethylbromosilane. Background Technology

[0002] Trimethylbromosilane is used as a silanizing agent, a deesterifying agent for phosphate diesters, and a deprotecting agent during peptide synthesis.

[0003] The preparation of trimethylbromosilane typically uses hexamethyldisilether as a raw material, involving the addition of a brominating agent and phosphorus to initiate a reaction. After the reaction is complete, the product is obtained through distillation. The specific preparation steps are as follows:

[0004] Add hexamethyldisil ether and phosphorus to the reactor, purge with nitrogen for protection, start stirring and heat to a certain temperature;

[0005] During the controlled time period, the brominating agent (such as NBS or bromine) is added in batches.

[0006] After adding the brominating agent, continue the reaction at a constant temperature for a period of time;

[0007] After the reaction is complete, distillation is performed to obtain a qualified trimethylbromosilane product;

[0008] After the reaction substrate is cooled, ethanol is added, and the mixture is filtered to obtain phosphorus oxide, which can be sold or further processed.

[0009] In the above preparation process, a reaction vessel is often used for the reaction. After the reaction, the reaction vessel is heated and distilled again to obtain the trimethylbromosilane product. However, in the existing technology, distillation is carried out directly through the reaction vessel body. Since there are reactants or unreacted original compounds inside, direct distillation will lead to a decrease in the purity of trimethylbromosilane. Summary of the Invention

[0010] The purpose of this invention is to provide a multi-stage distillation apparatus for the production of trimethylbromosilane. This apparatus has high overall integration, reduces equipment and labor costs, and can effectively improve distillation efficiency while increasing the purity of trimethylbromosilane.

[0011] To achieve the above objectives, the present invention provides the following technical solution:

[0012] A multi-stage distillation apparatus for the production of trimethylbromosilane includes a reaction vessel body. Inside the reaction vessel body, a partition assembly and a partition plate are fixed, dividing the reaction vessel body into a reaction zone, a primary distillation zone, and a secondary distillation zone. The reaction zone, primary distillation zone, and secondary distillation zone are arranged sequentially from bottom to top. The partition assembly has a layered structure, including a mesh layer, a connecting layer, and a rate regulating layer. The mesh layer is located near the reaction zone, and the rate regulating layer is located near the secondary distillation zone. A condensation pipe is inserted inside the primary distillation zone, and a distillation outlet pipe is connected to the secondary distillation zone. The distillation outlet pipe is inserted into the top of the reaction vessel body, and a steam boosting mechanism is connected to the end of the distillation outlet pipe furthest from the reaction vessel body. Electric heating plates are fixed outside the reaction vessel body at positions corresponding to the reaction zone and the secondary distillation zone.

[0013] As a preferred embodiment of the present invention, the bottom of the reaction zone is connected to an outlet pipe, and a number of feed pipes are connected to the side. Each feed pipe is provided with a first solenoid valve. The end of the outlet pipe away from the reaction zone is screwed with a cover plate, and a dripping pipe is provided between the feed pipes.

[0014] As a preferred embodiment of the present invention, the mesh layer is provided with a plurality of through holes, the connecting layer is provided with a plurality of sets of through holes, the diameter of the through holes is larger than the diameter of the through holes, the number of through holes is less than the number of through holes, a one-way membrane is embedded in the through holes, the rate adjustment layer is rotatably connected above the mesh layer, and the rate adjustment layer is provided with hollow areas, the number of hollow areas being the same as the number of sets of through holes.

[0015] As a preferred embodiment of the present invention, the rate regulating layer has a plurality of teeth fixed on its side, and gears mesh with the teeth. The gears extend out of the reactor body along the side of the first-stage distillation area. The gears are connected to a servo motor. A protective cover is fixed to the outside of the reactor body for the servo motor. The servo motor is electrically connected to a timer switch. The timer switch is also electrically connected to an electric heating plate. A support rod is screwed to the side of the timer switch. The end of the support rod away from the timer switch is fixed to the side of the reactor body.

[0016] As a preferred embodiment of the present invention, a heat insulation cotton board is bonded to the inner wall of the primary distillation area, a steel plate is bonded to the heat insulation cotton board facing the inside of the primary distillation area, a pressure pipe is inserted into the side of the primary distillation area, and a connecting pipe is fixed between the secondary distillation area and the primary distillation area, with an interval between the connecting pipe and the bottom of the primary distillation area.

[0017] As a preferred embodiment of the present invention, the condensation pipe is located inside the primary distillation zone and has an annular guide pipe fixed to its side, and a second solenoid valve is fixed to one end of the condensation pipe extending out of the reactor body.

[0018] In a preferred embodiment of the present invention, a stirring shaft is rotatably connected to the side of the reactor body, with both ends of the stirring shaft extending out of the reactor body. One end is provided with a rotating base, which is fixed to the side of the reactor body, and the stirring shaft rotates inside the rotating base. The other end is connected to a drive motor, which is installed on the side of the reactor body. The stirring shaft is located inside the reaction zone, and a C-shaped stirring rod is fixed to the side of the stirring shaft, which is located inside the reaction zone.

[0019] As a preferred embodiment of the present invention, the steam acceleration mechanism includes a connecting pipe fixed to the distillation outlet pipe by flange bolts, the other end of the connecting pipe being connected to and fixed to an acceleration pipe, a rotating bracket fixed inside the acceleration pipe, two rotating brackets being provided along the length of the acceleration pipe, a rotating shaft being rotatably connected inside the two rotating brackets, a plurality of steam turbine blades being fixed to the side of the rotating shaft, an acceleration rod being fixed to the flange bolt facing the steam outlet end of the rotating shaft, a drive motor being connected to the end of the rotating shaft away from the acceleration rod, and the drive motor being fixed to the inner wall of the acceleration pipe.

[0020] In a preferred embodiment of the present invention, the accelerator rod is tapered, with its radius gradually decreasing toward the end away from the rotation axis. Several fixing rings are fixed to the side of the accelerator rod, and several fixing rings are equidistantly arranged along the length direction of the accelerator rod. The inner diameter of the fixing rings gradually decreases along the length direction of the accelerator rod. All fixing rings are fixed with guide plates on their sides, and the surface of the guide plates is provided with several grooves.

[0021] In summary, the beneficial technical effects of the present invention are as follows:

[0022] 1. The reaction vessel body of the present invention is divided into a reaction zone, a primary distillation zone and a secondary distillation zone by the partition component and the partition plate. The reaction zone can continue to distill after the reaction. The distilled vapor enters the primary distillation zone and condenses into a liquid state, and then enters the secondary distillation zone for re-distillation, realizing multiple distillations, high integration, reduced cost and improved product purity.

[0023] 2. During distillation, the generated vapor gradually enters the primary distillation zone through the through holes on the mesh layer and the one-way membrane. At the same time, the rate regulating layer is provided with a hollow area. During the servo motor drive, the hollow area and the through hole are alternately covered. When not covered, the vapor can be discharged, thereby controlling the vapor discharge rate so that the vapor in the primary distillation zone can be completely condensed into liquid, further improving the purity of the product trimethylbromosilane.

[0024] 3. An acceleration pipe is installed. Driven by a motor, the amount of steam entering the acceleration pipe increases. As the amount of steam increases, the cross-sectional area of ​​the steam passing through the acceleration pipe decreases. At a constant flow rate, the steam is accelerated due to the decrease in cross-sectional area. As the amount of steam increases, the steam is further accelerated and then accelerated outward along the outside of the guide plate, so that the steam inside the reactor body is quickly discharged in larger quantities, thereby improving the steam collection efficiency. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the invention and form part of the specification, but do not constitute a limitation thereof. In the drawings:

[0026] Figure 1 This is a schematic diagram of a multi-distillation apparatus for the production of trimethylbromosilane in this embodiment;

[0027] Figure 2 This embodiment describes a multi-distillation apparatus for the production of trimethylbromosilane. Figure 1 Top view diagram;

[0028] Figure 3 This embodiment describes a multi-distillation apparatus for the production of trimethylbromosilane. Figure 2 Schematic diagram of the cross section along line AA;

[0029] Figure 4 This embodiment describes a multi-distillation apparatus for the production of trimethylbromosilane. Figure 2 Schematic diagram of the sectional view along the middle BB line;

[0030] Figure 5 This is a schematic diagram of the explosion structure of the isolation component and condensation pipe of a multi-distillation equipment for the production of trimethylbromosilane in this embodiment.

[0031] In the diagram, 1. Reactor body; 2. Partition plate; 3. Reaction zone; 4. Primary distillation zone; 5. Secondary distillation zone; 6. Mesh layer; 7. Connecting layer; 8. Rate regulating layer; 9. Condensation pipe; 10. Distillation outlet pipe; 11. Electric heating plate; 12. Feed pipe; 13. First solenoid valve; 14. Cover plate; 15. Dropper; 16. Through hole; 17. Through hole; 18. One-way membrane; 19. Hollowed-out area; 20. Gear teeth; 21. Gear; 22. Servo motor; 23. Protective cover; 24. Timer switch; 25. Support rod; 26. Heat insulation cotton board; 27. Steel plate; 28. Pressurization pipe; 29. ​​Connecting pipe; 30. Guide pipe; 31. Second solenoid valve; 32. Stirring shaft; 33. Drive motor; 34. C-shaped stirring rod; 35. Connecting pipe; 36. Acceleration pipe; 37. Rotating bracket; 38. Rotating shaft; 39. Steam turbine blade; 40. Acceleration rod; 41. Fixing ring; 42. Guide plate; 43. Ribbed groove; 44. Drive motor. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the accompanying drawings.

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figure 1-5 This invention provides a technical solution: a multi-stage distillation apparatus for the production of trimethylbromosilane. The apparatus includes a reaction vessel 1, with a partition assembly and a partition plate 2 fixed inside the reaction vessel 1. The partition assembly and partition plate 2 divide the reaction vessel 1 into a reaction zone 3, a primary distillation zone 4, and a secondary distillation zone 5, arranged sequentially from bottom to top. The partition assembly has a layered structure, including a mesh layer 6, a connecting layer 7, and a rate regulating layer 8. The mesh layer 6 is located near the reaction zone 3, and the rate regulating layer 8 is located near the secondary distillation zone. A condensing pipe 9 is inserted inside the primary distillation zone 4, and a distillation outlet pipe 10 is connected to the secondary distillation zone 5. The distillation outlet pipe 10 is inserted into the top of the reaction vessel 1, and a steam boosting mechanism is connected to the end of the distillation outlet pipe 10 away from the reaction vessel 1. Electric heating plates 11 are fixed outside the reaction vessel 1 at positions corresponding to the reaction zone 3 and the secondary distillation zone 5.

[0035] In this embodiment, the overall reaction vessel 1 is divided into a reaction zone 3, a primary distillation zone 4, and a secondary distillation zone 5 by the partition assembly and the partition plate 2. The reaction zone 3 can continue to be distilled after the reaction. The distilled vapor enters the primary distillation zone 4 and condenses into a liquid state, and then enters the secondary distillation zone 5 for re-distillation.

[0036] Specifically, the bottom of the reaction zone 3 is connected to an outlet pipe, and several feed pipes 12 are connected to the side. Each feed pipe 12 is equipped with a first solenoid valve 13. The end of the outlet pipe away from the reaction zone 3 is screwed with a cover plate 14, and a dripping pipe 15 is provided between the feed pipes 12.

[0037] In the specific reaction, feed pipe 12 is used for phosphorus tribromide and hexamethyldisil ether. After addition, the electric heating plate 11 located outside the reaction zone 3 is turned on to start the synthesis reaction. After the synthesis reaction is completed, trimethylbromosilane is distilled off, and then bromine is added into the reaction zone 3 through drop pipe 15 to continue the reaction. After the reaction is completed, trimethylbromosilane is distilled off again.

[0038] The mesh layer 6 has several through holes 16, and the connecting layer 7 has several sets of through holes 17. The diameter of the through holes 17 is larger than that of the through holes 16, and the number of through holes 17 is less than the number of through holes 16. A one-way membrane 18 is embedded in the through holes 17. The speed adjustment layer 8 is rotatably connected to the top of the mesh layer 6. The speed adjustment layer 8 has hollow areas 19 inside, and the number of hollow areas 19 is the same as the number of sets of through holes 17.

[0039] Several cleats 20 are fixed to the side of the rate regulating layer 8. Gears 21 mesh with the outside of the cleats 20. The side of the gears 21 extends out of the reactor body 1 along the side of the first-stage distillation zone 4. The gears 21 are connected to a servo motor 22. A protective cover 23 is fixed to the outside of the reactor body 1 for the servo motor 22. The servo motor 22 is electrically connected to a timer switch 24. The timer switch 24 is also electrically connected to an electric heating plate 11. A support rod 25 is fixed to the side of the timer switch 24 with screws. The end of the support rod 25 away from the timer switch 24 is fixed to the side of the reactor body 1.

[0040] The above-mentioned reaction time is 24 hours, and the timer switch 24 is set to be on and off for 24 hours. After the electric heating plate 11 starts heating, it is kept for 24 hours. Then the servo motor 22 is turned on. After the servo motor 22 is turned on, it can drive the gear 21 to rotate, thereby driving the speed adjustment layer 8 to rotate through the gear 21. The rotation speed of the speed adjustment layer 8 is determined by the power of the selected servo motor 22.

[0041] Furthermore, during distillation, the generated vapor gradually enters the first-stage distillation zone 4 through the through holes 16 on the mesh layer 6 and the one-way membrane 18. At the same time, the rate regulating layer 8 is provided with a hollow area 19. During the driving process of the servo motor 22, the hollow area 19 and the through hole 17 are alternately covered. When not covered, the vapor can be discharged, thereby controlling the vapor discharge rate so that the vapor inside the first-stage distillation zone 4 can be completely condensed into liquid.

[0042] The specific internal structure of the primary distillation zone 4 is as follows: a heat insulation cotton board 26 is bonded to the inner wall, and a steel plate 27 is bonded to the side of the heat insulation cotton board 26 facing the inside of the primary distillation zone 4. The heat insulation cotton board 26 is used to isolate heat from the side wall of the reactor body 1. The steel plate 27 is set to prevent liquid substances inside the primary distillation zone 4 from wetting the heat insulation cotton board 26. A pressure pipe 28 is inserted into the side of the primary distillation zone 4. A connecting pipe 29 is fixed between the secondary distillation zone 5 and the primary distillation zone 4. There is an interval between the connecting pipe 29 and the bottom of the primary distillation zone 4.

[0043] The condenser pipe 9 is located inside the first-stage distillation zone 4 and has an annular guide pipe 30 fixed on its side. One end of the condenser pipe 9 extending out of the reactor body 1 is fixed with a second solenoid valve 31.

[0044] The second solenoid valve 31 is connected in series with the servo motor 22. When the servo motor 22 is turned on, the second solenoid valve 31 opens synchronously. The condenser pipe 9 is kept in a constant state of connection with the external water source. After the second solenoid valve 31 is turned on, cold water is introduced into the condenser pipe 9. The cold water stays along the guide pipe 30, prolonging its time in the first-stage distillation zone 4. The vapor entering the first-stage distillation zone 4 is cooled to a liquid state after contacting the condenser pipe 9 and stays on the connecting layer 7. Since the connecting layer 7 is equipped with a one-way membrane 18, it avoids backflow to the reaction zone 3. At the same time, the pressure pipe 28 on its side pressurizes the first-stage distillation zone 4, so that the liquid substance enters the second-stage distillation zone 5 along the connecting pipe 29. The electric heating plate 11 outside the second-stage distillation zone 5 maintains the temperature required for distillation. The liquid substance is distilled again in the second-stage distillation zone 5, and the generated vapor is discharged along the distillation outlet pipe 10.

[0045] A stirring structure is present inside the reaction zone 3. Specifically, a stirring shaft 32 is rotatably connected to the side of the reaction vessel body 1. Both ends of the stirring shaft 32 extend out of the reaction vessel body 1. One end is provided with a rotating base, which is fixed to the side of the reaction vessel body 1. The stirring shaft 32 rotates inside the rotating base. The other end is connected to a drive motor 33, which is installed on the side of the reaction vessel body 1. The stirring shaft 32 is located inside the reaction zone 3. A C-shaped stirring rod 34 is fixed to the side of the stirring shaft 32. The C-shaped stirring rod 34 is located inside the reaction zone 3. During the reaction time, the drive motor 33 is kept on.

[0046] Meanwhile, a steam boosting mechanism is connected to the side of the distillation outlet pipe 10. Specifically, the steam boosting mechanism includes a connecting pipe 35 fixed to the distillation outlet pipe 10 by flange bolts. The other end of the connecting pipe 35 is connected to and fixed to an acceleration pipe 36. A rotating bracket 37 is fixed inside the acceleration pipe 36. Two rotating brackets 37 are provided along the length of the acceleration pipe 36. A rotating shaft 38 is rotatably connected inside the two rotating brackets 37. Several steam turbine plates 39 are fixed to the side of the rotating shaft 38. An acceleration rod 40 is fixed to the flange bolt facing the steam outlet end of the rotating shaft 38. A drive motor 44 is connected to the end of the rotating shaft 38 away from the acceleration rod 40. The drive motor 44 is fixed to the inner wall of the acceleration pipe 36.

[0047] The accelerator rod 40 is tapered, with its radius gradually decreasing towards the end away from the rotation axis 38. Several fixing rings 41 are fixed to the side of the accelerator rod 40. Several fixing rings 41 are equidistantly arranged along the length of the accelerator rod 40. The inner diameter of the fixing rings 41 gradually decreases along the length of the accelerator rod 40. All fixing rings 41 are fixed to the side with guide plates 42. The surface of the guide plates 42 is provided with several grooves 43.

[0048] Steam enters the acceleration pipe 36, turning on the drive motor 44. The drive motor 44 drives the rotating shaft 38 to rotate, thereby rotating the acceleration rod 40. At the same time, the steam turbine 39 begins to rotate, thus increasing the amount of steam entering the acceleration pipe 36 compared to a normal pipe. Since the acceleration rod 40 has a conical structure, the cross-sectional area of ​​the channel inside the acceleration pipe 36 at the point where the acceleration rod 40 enters is reduced. Furthermore, a guide plate 42 with grooves 43 is fixed on the acceleration rod 40. Therefore, as the acceleration rod 40 rotates, the amount of steam entering the acceleration pipe 36 increases. Simultaneously, as the amount of steam increases, the cross-sectional area of ​​the steam passing through the acceleration pipe 36 decreases. At a constant flow rate, the steam is accelerated due to the reduced cross-sectional area. As the amount of steam increases, the steam is further accelerated and then accelerated outward along the outside of the guide plate 42, resulting in a rapid increase in the amount of steam discharged from the reactor body 1, thereby improving the steam collection efficiency.

[0049] The working principle of this invention is as follows: Combining the synthesis process of trimethylbromosilane, a feed pipe 12 is set up for phosphorus tribromide and hexamethyldisiloxane. After addition, the electric heating plate 11 located outside the reaction zone 3 is turned on to start the synthesis reaction. After the synthesis reaction is completed, trimethylbromosilane is distilled out, and then bromine is added into the reaction zone 3 through the drop pipe 15 to continue the reaction. After the reaction is completed, trimethylbromosilane is distilled out again. Thus, the entire reaction is integrated into the same reaction vessel 1, which effectively improves the synthesis efficiency. At the same time, during the distillation process, there are primary distillation zone 4 and secondary distillation zone 5. Before the final collection of trimethylbromosilane, it is distilled multiple times to improve the purity of trimethylbromosilane. Combined with the accelerating and resisting structure after the vapor is discharged, the equipment has high overall integration, reduces equipment and labor costs, and can effectively improve the distillation efficiency while improving the purity of trimethylbromosilane.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0051] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-stage distillation apparatus for the production of trimethylbromosilane, characterized in that, The device includes a reaction vessel body (1), inside which a partition assembly and a partition plate (2) are fixed. The partition assembly and the partition plate (2) divide the reaction vessel body (1) into a reaction zone (3), a primary distillation zone (4), and a secondary distillation zone (5). The reaction zone (3), the primary distillation zone (4), and the secondary distillation zone (5) are arranged sequentially from bottom to top. The partition assembly has a layered structure, including a mesh layer (6), a connecting layer (7), and a rate regulating layer (8). The mesh layer (6) is close to the reaction zone. (3) The rate regulating layer (8) is set close to the secondary distillation layer. A condenser pipe (9) is inserted inside the primary distillation area (4). A distillation outlet pipe (10) is connected to the secondary distillation area (5). The distillation outlet pipe (10) is inserted into the top of the reactor body (1). A steam boosting mechanism is connected to the end of the distillation outlet pipe (10) away from the reactor body (1). Electric heating plates (11) fixed to the outside of the reactor body (1) are provided at the positions corresponding to the reaction area (3) and the secondary distillation area (5).

2. The multi-distillation apparatus for the production of trimethylbromosilane according to claim 1, characterized in that, The bottom of the reaction zone (3) is connected to an outlet pipe, and several feed pipes (12) are connected to the side. Each feed pipe (12) is equipped with a first solenoid valve (13). The end of the outlet pipe away from the reaction zone (3) is screwed with a cover plate (14), and a dripping pipe (15) is provided between the feed pipes (12).

3. The multi-distillation apparatus for the production of trimethylbromosilane according to claim 1, characterized in that, The mesh layer (6) has a plurality of through holes (16), and the connecting layer (7) has a plurality of through holes (17) inside. The diameter of the through holes (17) is larger than that of the through holes (16), and the number of through holes (17) is less than the number of through holes (16). A one-way membrane (18) is embedded inside the through holes (17). The speed regulating layer (8) is rotatably connected to the top of the mesh layer (6). The speed regulating layer (8) has a hollow area (19) inside. The number of hollow areas (19) is the same as the number of through holes (17).

4. The multi-stage distillation apparatus for the production of trimethylbromosilane according to claim 3, characterized in that, The rate regulating layer (8) has several teeth (20) fixed on its side. Gears (21) mesh with the teeth (20). The side of the gears (21) extends out of the reactor body (1) along the side of the first-stage distillation area (4). The gears (21) are connected to a servo motor (22). The servo motor (22) is provided with a protective cover (23) fixed to the outside of the reactor body (1). The servo motor (22) is electrically connected to a timer switch (24). The timer switch (24) is also electrically connected to an electric heating plate (11). A support rod (25) is fixed to the side of the timer switch (24) with screws. The end of the support rod (25) away from the timer switch (24) is fixed to the side of the reactor body (1).

5. The multi-stage distillation apparatus for the production of trimethylbromosilane according to claim 3, characterized in that, The inner wall of the primary distillation zone (4) is bonded with a heat insulation cotton board (26), and a steel plate (27) is bonded to the side of the heat insulation cotton board facing the inside of the primary distillation zone (4). A pressure pipe (28) is inserted into the side of the primary distillation zone (4). A connecting pipe (29) is fixed between the secondary distillation zone (5) and the primary distillation zone (4). There is an interval between the connecting pipe (29) and the bottom of the primary distillation zone (4).

6. The multi-distillation apparatus for the production of trimethylbromosilane according to claim 1, characterized in that, The condenser pipe (9) is located inside the first-stage distillation area (4) and has an annular guide pipe (30) fixed on its side. A second solenoid valve (31) is fixed at one end of the condenser pipe (9) that extends out of the reactor body (1).

7. The multi-distillation apparatus for the production of trimethylbromosilane according to claim 1, characterized in that, A stirring shaft (32) is rotatably connected to the side of the reactor body (1). The stirring shaft (32) extends out of the reactor body (1) at both ends. One end is provided with a rotating base, which is fixed to the side of the reactor body (1). The stirring shaft (32) rotates inside the rotating base. The other end is connected to a drive motor (33), which is installed on the side of the reactor body (1). The stirring shaft (32) is located inside the reaction zone (3). A U-shaped stirring rod (34) is fixed to the side of the stirring shaft (32), which is located inside the reaction zone (3).

8. The multi-stage distillation apparatus for the production of trimethylbromosilane according to claim 1, characterized in that, The steam acceleration mechanism includes a connecting pipe (35) fixed to the distillation outlet pipe (10) by flange bolts. The other end of the connecting pipe (35) is connected to an acceleration pipe (36). A rotating bracket (37) is fixed inside the acceleration pipe (36). Two rotating brackets (37) are provided along the length of the acceleration pipe (36). A rotating shaft (38) is rotatably connected inside the two rotating brackets (37). Several turbine blades (39) are fixed on the side of the rotating shaft (38). An acceleration rod (40) is fixed to the flange bolt facing the steam outlet end of the rotating shaft (38). A drive motor (44) is connected to the end of the rotating shaft (38) away from the acceleration rod (40). The drive motor (44) is fixed on the inner wall of the acceleration pipe (36).

9. The multi-distillation apparatus for the production of trimethylbromosilane according to claim 8, characterized in that, The accelerator rod (40) is tapered, with its radius gradually decreasing toward the end away from the rotation axis (38). Several fixing rings (41) are fixed on the side of the accelerator rod (40). Several fixing rings (41) are equidistantly arranged along the length direction of the accelerator rod (40). The inner diameter of the fixing rings (41) gradually decreases along the length direction of the accelerator rod (40). All fixing rings (41) are fixed with guide plates (42) on their sides. Several grooves (43) are provided on the surface of the guide plates (42).

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