Efficient separation system for hydrogen chloride in dimethyldichlorosilane hydrolysate

Abstract

The utility model discloses an efficient separation system for hydrogen chloride in dimethyldichlorosilane hydrolysate, which comprises a first delivery pipe and a second delivery pipe, outlets of the first delivery pipe and the second delivery pipe are connected with a mixer, an outlet of the mixer is connected with a liquid phase inlet of a heat exchanger, and a liquid phase outlet of the heat exchanger is connected with a hydrolysis tower. A top gas outlet and a liquid phase outlet of the hydrolysis tower are connected with a first washing tower, a tower top outlet of the first washing tower is connected with a cyclone separator, a top gas outlet of the cyclone separator is connected with a chloromethane synthesis system, a bottom liquid outlet of the cyclone separator is connected with a phase separator, and a tower kettle outlet of the first washing tower is communicated with an inlet of the phase separator; a gas outlet in the top of the phase separator is connected with a degassing system, a liquid outlet in the bottom of the phase separator is connected with a circulating pipe, the circulating pipe is communicated with an inlet of the mixer, and an acid supplementing pipe and a circulating pump are mounted on the circulating pipe. The system not only can realize the separation of hydrogen chloride gas and hydrolysate siloxane, but also can realize the reutilization of hydrogen chloride.

Description

Technical Field

[0001] The utility model belongs to the technical field of organic silicon production and processing, and specifically relates to a high-efficiency separation system of hydrogen chloride in dimethyldichlorosilane hydrolyzate. Background Art

[0002] In the production process of organosilicon, it is an important link in the production process of organosilicon to obtain organosiloxane by subjecting dimethyldichlorosilane to a series of hydrolysis reactions in the reactor. The quality of the process level of this link is directly related to the quality of organosilicon products and the recovery efficiency of chlorine in the production raw materials. An excellent hydrolysis scheme can effectively reduce the production cost of organosilicon products. The hydrolysis process itself is a dechlorination process. The chlorine content in the product polysiloxane is theoretically non-existent, but because the density difference between polysiloxane and water is very small, it is difficult to completely separate them. Generally, it is required to be less than 10 mg / kg. The lower the chlorine, the better the quality of the hydrolyzate, the higher the chlorine resource recovery, and the better the environmental protection and economic benefits of the enterprise. At present, the principle of the dimethyldichlorosilane hydrolysis reaction used in China is that a certain amount of dimethyldichlorosilane and water react under acidic conditions to generate polydimethylsiloxane and a certain amount of hydrogen chloride, and then separate them through a phase separator to obtain a hydrolyzate with higher purity. Hydrolysis is a key process for producing organosilicon derivatives from dimethyldichlorosilane monomer. In the existing technology, the device for producing hydrolyzate is mainly a hydrolysis tower, that is, after dimethyldichlorosilane monomer and hydrochloric acid are hydrolyzed in the hydrolysis tower, the hydrolysis product does not need to be separated from hydrogen chloride. The hydrogen chloride gas generated in the hydrolysis tower is directly sent to the methyl chloride synthesis system for use after being discharged from the top of the hydrolysis tower. Since the content of siloxane entrained in the discharged hydrogen chloride gas is high during the hydrolysis process, the hydrogen chloride gas enters the methyl chloride production system for recycling. After a period of use, it will cause the pipeline of the methyl chloride synthesis system to be blocked, seriously affecting the production efficiency of the system; at the same time, a large amount of hydrogen chloride will be entrained in the hydrolyzate siloxane obtained by hydrolysis in the hydrolysis tower. The generated hydrolyzate siloxane directly enters the degassing system and the water washing separation system, which will increase the degassing burden of the back-end degassing system and the water washing separation system, resulting in low purity of siloxane after water washing separation, reduced product quality, and increased load of the entire production system, affecting the stability of system operation. Therefore, it is an objective need to develop an efficient separation system for hydrogen chloride in dimethyldichlorosilane hydrolyzate with reasonable structural design, significant separation effect, low operating cost and stable operation. Summary of the invention

[0003] The utility model aims to provide a high-efficiency separation system for hydrogen chloride in dimethyldichlorosilane hydrolyzate, which has reasonable structural design, remarkable separation effect, low operating cost and stable operation.

[0004] The purpose of the utility model is achieved in this way, including a first conveying pipe and a second conveying pipe, the outlets of the first conveying pipe and the second conveying pipe are connected to a mixer, the outlet of the mixer is connected to the liquid phase inlet of a heat exchanger, the liquid phase outlet of the heat exchanger is connected to a hydrolysis tower, the top gas outlet and the liquid phase outlet of the hydrolysis tower are connected to a first washing tower, the top outlet of the first washing tower is connected to a cyclone separator, the top gas outlet of the cyclone separator is connected to a chloromethane synthesis system, the bottom liquid outlet of the cyclone separator is connected to a phase separator, the kettle outlet of the first washing tower is connected to the inlet of the phase separator, the top gas outlet of the phase separator is connected to a degassing system, the bottom liquid outlet of the phase separator is connected to a circulation pipe, the circulation pipe is connected to the mixer inlet, and an acid-supplementing pipe and a circulation pump are installed on the circulation pipe.

[0005] Compared with the existing hydrolysis device, the advantages of the device are: first, a mixer and a heat exchanger are arranged at the feed end of the hydrolysis tower, the mixer can evenly mix the dimethyldichlorosilane monomer and the hydrochloric acid, which is beneficial to improving the effect of the hydrolysis, and the heat exchanger is used to heat and heat the mixture of the dimethyldichlorosilane monomer and the hydrochloric acid, so as to increase the temperature of the mixture of the dimethyldichlorosilane monomer and the hydrochloric acid entering the hydrolysis tower, which is beneficial to increasing the hydrolysis speed of the hydrolysis tower and improving the effect of the hydrolysis; second, a first washing system is arranged between the hydrolysis tower and the degassing system. The washing tower, cyclone separator and phase separator, the hydrolyzed siloxane and hydrogen chloride gas obtained by the hydrolysis reaction in the hydrolysis tower need to enter the first washing tower for washing and separation at the same time. After the washing and separation in the first washing tower, the separation of hydrogen chloride gas and hydrolyzed siloxane can be achieved better. After the hydrogen chloride gas separated by washing is separated by the cyclone separator, the liquid phase siloxane carried in the hydrogen chloride gas can be separated more thoroughly, reducing the entrainment amount of siloxane in the hydrogen chloride gas, thereby effectively improving the hydrogen chloride gas. The purity of the whole system can be improved, and the problem of the entrainment of siloxane by hydrogen chloride gas and the return to the methyl chloride synthesis system to cause pipeline blockage can be avoided, which can effectively improve the efficiency of methyl chloride production. After the hydrolyzate siloxane separated by washing and the small amount of siloxane separated by cyclone are separated again by the phase separator, the entrainment of hydrogen chloride gas in the hydrolyzate siloxane can be greatly reduced, thereby reducing the separation burden of the subsequent degassing system, which is beneficial to improving the product quality of the hydrolyzate siloxane, reducing the operating load of the system, and ensuring the efficient and stable operation of the device; thirdly, when the system can achieve efficient separation of hydrogen chloride, the separated hydrogen chloride can be recycled in two ways, one is to recover it in the form of gas phase and enter the front-end methyl chloride synthesis system for use, and the other is to send it into the hydrolysis tower through the circulation pipe in the form of liquid hydrochloric acid for recycling. This structure can not only reduce the production cost, but also avoid the discharge of waste acid and avoid environmental pollution. It has the advantages of reasonable structural design, significant separation effect, low operating cost and stable operation, and is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0007] Figure 2 It is a structural schematic diagram of the first washing tower 4;

[0008] Figure 3 for Figure 2 The enlarged schematic diagram of part A in the figure.

[0009] Figure 4 is a distribution diagram of the drainage holes 413 on the riser 410;

[0010] Figure 5 is a distribution diagram of the overflow holes 415 on the lift pipe 410;

[0011] Figure 6 is a top view of the separation plate 414;

[0012] In the figure: 1-mixer, 2-heat exchanger, 3-hydrolysis tower, 4-first washing tower, 41-tower body, 42-upper head, 43-lower head, 44-feed pipe, 45-inlet pipe, 46-packing section, 47-washing pipe, 48-wire mesh demister, 49-distribution plate, 410-rising pipe, 411-conical cap, 412-air flow channel, 413-drain hole, 414-separation plate, 415-overflow hole, 416-positioning plate, 417-folding plate, 418-spring, 419-pull rod, 5-cyclone separator, 6-chloromethane synthesis system, 7-phase separator, 8-degassing separation system, 9-circulation pipe, 10-acid supplementation pipe, 11-first delivery pipe, 12-second delivery pipe, 13-second washing tower, 14-demister, 15-reflux pipe, 16 circulation pump, 17-cooler. DETAILED DESCRIPTION

[0013] The present invention is further described below in conjunction with the accompanying drawings, but the present invention is not limited in any way. Any changes or improvements made based on the teachings of the present invention belong to the protection scope of the present invention.

[0014] like Figures 1 to 6As shown, the utility model comprises a first delivery pipe 11 and a second delivery pipe 12, the first delivery pipe 11 is used to deliver dimethyl dichloromonomer to the mixer 1, the second delivery pipe 12 is used to deliver dilute hydrochloric acid to the mixer 1, the outlets of the first delivery pipe 11 and the second delivery pipe 12 are connected with the mixer 1, the mixer 1 adopts the venturi mixer used in the prior art, the outlet of the mixer 1 is connected with the liquid phase inlet of the heat exchanger 2, the heat exchanger 2 is the shell and tube heat exchanger used in the prior art, the heating medium in the heat exchanger 2 adopts hot water or steam, the liquid phase outlet of the heat exchanger 2 is connected with the hydrolysis tower 3, the hydrolysis tower 3 is the structure used in the prior art, the top gas outlet and the liquid phase outlet of the hydrolysis tower 3 are connected with the first washing tower 4, the top outlet of the first washing tower 4 is connected with the cyclone separator 5, the cyclone separator The separator 5 adopts a cyclone for gas-liquid separation used in the prior art. The top gas outlet of the cyclone separator 5 is connected to a chloromethane synthesis system 6, and the bottom liquid outlet of the cyclone separator 5 is connected to a phase separator 7. The phase separator 7 is a two-phase separator used in the prior art. The tower bottom outlet of the first washing tower 4 is connected to the inlet of the phase separator 7. The top gas outlet of the phase separator 7 is connected to a degassing system 8, and the bottom liquid outlet of the phase separator 7 is connected to a circulation pipe 9. The circulation pipe 9 is connected to the inlet of the mixer 1. An acid supplement pipe 10 and a feeding pump are installed on the circulation pipe 9. The acid supplement pipe 10 is used to replenish fresh hydrochloric acid in the mixer 1 in real time. On the one hand, the water balance in the system can be maintained, and on the other hand, the balance of acid concentration during the operation of the system can be maintained to ensure stable and efficient operation of the entire system.

[0015] The working process of the system is as follows: the dimethyldichlorosilane monomer delivered by the first delivery pipe 11 and the dilute hydrochloric acid delivered by the second delivery pipe 12 are first mixed in the mixer 1, and then the mixed dimethyldichlorosilane and hydrochloric acid mixture is sent to the heat exchanger 2 for heating. The dimethyldichlorosilane and hydrochloric acid mixture is heated by heating, which can increase the temperature of the dimethyldichlorosilane and hydrochloric acid mixture entering the hydrolysis tower 3, which is beneficial to improving the speed and effect of the hydrolysis reaction. After being heated to a fixed temperature, the heated dimethyldichlorosilane and hydrochloric acid mixture is sent to the hydrolysis tower 3 for hydrolysis reaction. The chloride produced by the hydrolysis The hydrogen gas is discharged from the top of the hydrolysis tower 3, and the hydrolyzed siloxane produced by the hydrolysis is discharged from the upper part of the hydrolysis tower 3. Then, the hydrogen chloride gas and the hydrolyzed siloxane discharged from the hydrolysis tower 3 are simultaneously sent to the first washing tower 4, and the hydrolyzed siloxane and the hydrogen chloride gas are washed and separated with hydrochloric acid. The gaseous hydrogen chloride washed and separated in the first washing tower 4 is taken out from the top outlet of the upper end of the first washing tower 4 and sent to the cyclone separator 5 for separation. The separated hydrogen chloride gas is taken out from the upper end of the cyclone separator 5 and sent to the methyl chloride synthesis system 6 for recycling. After the hydrogen chloride gas is treated by cyclone separation, the siloxane in the gaseous hydrogen chloride gas can be significantly reduced. The entrainment amount can effectively improve the purity of hydrogen chloride gas, avoid the problem that hydrogen chloride gas carries siloxane and returns to the chloromethane synthesis system 6 to cause pipeline blockage, and can effectively improve the efficiency of chloromethane production. At the same time, the separated hydrogen chloride is sent to the chloromethane synthesis system 6 in the form of gas phase for use, which can effectively improve the utilization rate of hydrogen chloride gas, and can realize the utilization of gas phase hydrogen chloride for a long time, thereby reducing the production cost; and the liquid phase carrying siloxane extracted from the bottom of the cyclone separator 5 and the hydrolyzate siloxane separated by washing from the first washing tower 4 enter the phase separator 7 for secondary separation. After separation, the separation The siloxane is extracted from the upper end of the phase separator 7 and sent to the degassing separation system 8, and the separated hydrochloric acid solution is extracted from the lower end of the phase separator 7 and returned to the mixer 1 through the circulation pipe 9 to continue to participate in the hydrolysis reaction. The hydrolyzed siloxane separated by washing and the small amount of siloxane separated by cyclone are separated again by phase separation, which can greatly reduce the entrainment of hydrogen chloride gas in the hydrolyzed siloxane, and can effectively improve the product quality of siloxane. The hydrogen chloride separated by phase separation is transported to the hydrolysis process in the form of liquid hydrochloric acid for recycling, which can not only reduce the production cost, but also avoid the discharge of waste acid and avoid environmental pollution.

[0016] Furthermore, a second washing tower 13 and a demister 14 are provided between the cyclone separator 5 and the methyl chloride synthesis system 6, the top gas outlet of the cyclone separator 5 is communicated with the second washing tower 13, the top outlet of the second washing tower 13 is communicated with the demister 14, the top gas outlet of the demister 14 is communicated with the methyl chloride synthesis system 6, the bottom outlet of the second washing tower 13 and the liquid phase outlet of the demister 14 are communicated with the phase separator 7, the bottom of the second washing tower 13 is provided with a reflux pipe 15 communicated with the upper part, the reflux pipe 15 is provided with a circulating pump 16 and a cooler 17, the cooler 17 adopts the heat exchanger structure used in the prior art, during the use of the system, in order to improve the separation effect, the hydrogen chloride gas separated from the cyclone separator 5 before entering the methyl chloride synthesis system 6, It needs to first enter the second washing tower 13 for washing and separation again with circulating hydrochloric acid. The circulating hydrochloric acid adopts the liquid phase containing siloxanes extracted from the bottom of the second dehydrogenation tower 13. The circulating hydrochloric acid used from the bottom of the second washing tower is sent to the cooler 17 by the circulating pump 16 for cooling treatment and then returned to the second washing tower 13 for recycling. After the circulating washing liquid reduces the temperature, the gas partial pressure can be reduced, thereby promoting the rapid separation of hydrogen chloride gas and siloxane. After that, the hydrogen chloride gas washed and separated from the second washing tower 13 is sent to the demister 14 for treatment to remove the liquid phase water and siloxanes entrained in the hydrogen chloride gas, and then enters the chloroform synthesis system 6 for recycling. The liquid phase containing siloxanes extracted from the bottom of the second washing tower 13 and the bottom of the demister 14 enters the phase separator 5 for separation treatment.

[0017] Furthermore, the first washing tower 4 can adopt a plate tower or a packed tower used in the prior art. Preferably, the first washing tower 4 includes a tower body 41 and an upper head 42 and a lower head 43 installed at both ends of the tower body 41. The upper head 42 and the lower head 43 adopt the elliptical heads used in the prior art. A skirt is installed on the lower side of the lower head 43. The tower kettle outlet is arranged on the lower head 43, and the tower top outlet is arranged on the upper head 42. A feed pipe 44 and an air inlet pipe 45 are arranged at the lower part of the tower body 41. The air inlet pipe 45 is connected to the top air outlet of the hydrolysis tower 3, and the feed pipe 44 is connected to the liquid phase outlet of the hydrolysis tower 3. The feed pipe 44 is located at the lower side of the air inlet pipe 45. A first gas-liquid distributor is arranged in the tower body at the lower side of the feed pipe 44. 2 to 3 layers of packing sections 46 are arranged in the tower body on the upper side of the air inlet pipe 45. A second gas-liquid distributor is installed in the tower body 41 on the upper side of each layer of packing section 46. Preferably, the packing section 46 includes a grid plate, a pressure plate and a ball ring packing installed between the grid plate and the pressure plate. A washing pipe 47 is arranged on the tower body 41 of the second gas-liquid distributor at the uppermost layer, and a wire mesh demister 48 is arranged in the tower body 41 on the upper side of the washing pipe 47. When the hydrolyzate and hydrogen chloride gas discharged from the hydrolysis tower 4 are washed and separated in the first washing tower 4, dilute hydrochloric acid is first fed into the washing pipe 47, and the dilute hydrochloric acid flows downward in the tower body 41. After the hydrolyzate and hydrogen chloride gas enter the tower body 41, the hydrogen chloride gas flows upward. After cyclic gas-liquid contact and gas-liquid separation are carried out between the packing section 46 and the second gas distributor, the separation of hydrogen chloride in the hydrolyzate can be achieved. The separated hydrogen chloride gas is discharged from the tower top outlet after degassing treatment by the wire mesh demister 48, and the hydrolyzate siloxane separated by washing is discharged from the tower bottom outlet after separation by the first gas-liquid distributor and enters the phase separator 7.Furthermore, in order to achieve a better gas-liquid separation effect, the structure of the second gas-liquid distributor is the same as that of the first gas-liquid distributor, and both include a distribution plate 49 and a riser 410. The distribution plate 49 is fixedly mounted on the inner wall of the tower body 41, and a plurality of distribution through holes are evenly distributed on the distribution plate 49. The riser 410 is installed on the distribution through holes. A cone cap 411 is installed on the top of the riser 410 through a connecting rod. An air flow channel 412 is left between the cone cap 411 and the riser 410. A drainage hole 413 is provided at the lower part of the tube 410, and a separation plate 414 is installed at the bottom of the riser 410. The separation plate 414 is provided with a separation hole. During normal operation, the hydrogen sulfide gas flows upward, and the siloxane carried in the hydrogen chloride gas can be separated by the separation of the separation plate 414. The separated siloxane droplets flow downward, and the hydrogen chloride continues to flow in the riser 410. After the secondary blocking of the cone cap 411, the small siloxane droplets in the hydrogen chloride gas collide on the cone cap 411 to form The larger droplets flow downward, while the hydrogen chloride gas is discharged from the gas flow channel 412 and continues to flow upward, and the siloxane hydrolyzate flowing from top to bottom gathers on the distribution plate 49, and enters the riser 410 through the drainage hole 413, and flows downward from the riser 410 until it is discharged from the tower bottom outlet. The drainage holes 413 are 3 to 6, and the drainage holes 413 are evenly distributed on the circumference of the riser 410, and the drainage holes 413 are circular holes, which can effectively ensure the effective transportation of the hydrolyzate siloxane; the separation holes are divided into inner and outer holes. The side holes, outer holes, inner holes and outer holes are evenly arranged in a ring shape, so that the hydrogen chloride gas and liquid and the hydrolyzate siloxane can be evenly and stably distributed; an overflow hole 415 is provided on the riser 410 on the upper side of the discharge hole 413, and there are two overflow holes 415, which are symmetrically arranged on the riser 410, and the overflow holes 415 are strip holes. In order to ensure the high efficiency of hydrolyzate transportation and improve the efficiency of gas-liquid separation, when the hydrolyzate siloxane accumulated on the distribution plate 49 is at a high level, it can be discharged through the overflow hole 415.

[0018] In order to timely grasp the operating conditions in the first washing tower 4 and improve the safety of use, the tower body 41 is provided with multiple manholes and pressure measuring holes, the lower part of the tower body 41 is provided with a sight glass port and a temperature measuring port, and the upper head 42 is provided with 1 to 2 spare ports.

[0019] Furthermore, in order to ensure that the gas flow discharged from the hydrogen chloride gas is uniform and constant, an air flow buffer component is installed in the lower head 43 on the lower side of the tower top outlet, and the air flow buffer component includes a positioning plate 416 and a folding plate 417 installed on the edge of the positioning plate 416. The positioning plate 416 is evenly processed with a plurality of air guide holes, and 3 to 5 springs 418 are evenly installed on the upper surface of the positioning plate 416. The upper end of the spring 418 is fixedly connected to the inner wall of the upper head 42 through a pull rod 419. The hydrogen chloride gas treated by the wire mesh demister 48 flows upward through the air guide holes on the positioning plate 416. The spring 418 can play a role in buffering the air flow, ensuring that the flow rate and flow rate of the hydrogen chloride gas entering the tower top outlet are stable, which is conducive to improving the utilization rate of the recycling of hydrogen chloride.

Claims

1. A highly efficient separation system for hydrogen chloride in dimethyldichlorosilane hydrolyzate, comprising a first delivery pipe (11) and a second delivery pipe (12), characterized in that: The outlets of the first conveying pipe (11) and the second conveying pipe (12) are connected to a mixer (1), the outlet of the mixer (1) is connected to the liquid phase inlet of the heat exchanger (2), the liquid phase outlet of the heat exchanger (2) is connected to a hydrolysis tower (3), the top gas outlet and the liquid phase outlet of the hydrolysis tower (3) are connected to a first washing tower (4), the top outlet of the first washing tower (4) is connected to a cyclone separator (5), the top gas outlet of the cyclone separator (5) is connected to A chloromethane synthesis system (6), wherein the bottom liquid outlet of the cyclone separator (5) is connected to a phase separator (7), the bottom outlet of the first washing tower (4) is connected to the inlet of the phase separator (7), the top gas outlet of the phase separator (7) is connected to a degassing system (8), the bottom liquid outlet of the phase separator (7) is connected to a circulation pipe (9), the circulation pipe (9) is connected to the inlet of the mixer (1), and an acid supplement pipe (10) and a circulation pump are installed on the circulation pipe (9).

2. The efficient separation system of hydrogen chloride in dimethyldichlorosilane hydrolyzate according to claim 1, characterized in that: A second washing tower (13) and a demister (14) are arranged between the cyclone separator (5) and the methyl chloride synthesis system (6); the top gas outlet of the cyclone separator (5) is connected to the second washing tower (13); the top outlet of the second washing tower (13) is connected to the demister (14); the top gas outlet of the demister (14) is connected to the methyl chloride synthesis system (6); the bottom outlet of the second washing tower (13) and the liquid phase outlet of the demister (14) are connected to the phase separator (7); a reflux pipe (15) connected to the upper part is arranged at the bottom of the second washing tower (13); and a circulation pump (16) and a cooler (17) are arranged on the reflux pipe (15).

3. The efficient separation system of hydrogen chloride in dimethyldichlorosilane hydrolyzate according to claim 1, characterized in that: The first washing tower (4) comprises a tower body (41) and an upper head (42) and a lower head (43) installed at both ends of the tower body (41); a skirt seat is installed on the lower side of the lower head (43); the tower kettle outlet is arranged on the lower head (43); the tower top outlet is arranged on the upper head (42); a feed pipe (44) and an air inlet pipe (45) are arranged at the lower part of the tower body (41); the feed pipe (44) is located at the air inlet pipe (45); A first gas-liquid distributor is arranged in the tower body below the feed pipe (44), 2 to 3 layers of packing sections (46) are arranged in the tower body above the air inlet pipe (45), a second gas-liquid distributor is installed in the tower body (41) above each layer of packing section (46), a washing pipe (47) is arranged on the tower body (41) of the uppermost second gas-liquid distributor, and a wire mesh demister (48) is arranged in the tower body (41) above the washing pipe (47).

4. The efficient separation system of hydrogen chloride in dimethyldichlorosilane hydrolyzate according to claim 3, characterized in that: The structure of the second gas-liquid distributor is the same as that of the first gas-liquid distributor, and both include a distribution plate (49) and a riser (410). The distribution plate (49) is fixedly mounted on the inner wall of the tower body (41). The distribution plate (49) is evenly processed with a plurality of distribution through holes. The riser (410) is installed on the distribution through holes. A cone cap (411) is installed on the top of the riser (410) through a connecting rod. An air flow channel (412) is left between the cone cap (411) and the riser (410). A drainage hole (413) is provided at the bottom of the riser (410). A separation plate (414) is installed at the bottom of the riser (410), and a separation hole is installed on the separation plate (414).

5. The efficient separation system of hydrogen chloride in dimethyldichlorosilane hydrolyzate according to claim 4, characterized in that: There are 3 to 6 drainage holes (413), which are evenly distributed around the circumference of the riser (410) and are circular holes.

6. The efficient separation system of hydrogen chloride in dimethyldichlorosilane hydrolyzate according to claim 4, characterized in that: The separation holes are divided into inner holes and outer holes, and the inner holes and the outer holes are evenly arranged in a ring shape.

7. The efficient separation system of hydrogen chloride in dimethyldichlorosilane hydrolyzate according to claim 4, characterized in that: An overflow hole (415) is provided on the riser (410) on the upper side of the drainage hole (413). There are two overflow holes (415) which are symmetrically arranged on the riser (410) and are strip-shaped holes.

8. The efficient separation system of hydrogen chloride in dimethyldichlorosilane hydrolyzate according to claim 3, characterized in that: The tower body (41) is provided with a plurality of manholes and pressure measuring holes, the lower part of the tower body (41) is provided with a sight glass port and a temperature measuring port, and the upper sealing head (42) is provided with 1 to 2 spare ports.

9. The efficient separation system of hydrogen chloride in dimethyldichlorosilane hydrolyzate according to claim 3, characterized in that: An airflow buffer assembly is installed in the lower head (43) at the lower side of the tower top outlet, and the airflow buffer assembly includes a positioning plate (416) and a folding plate (417) installed on the edge of the positioning plate (416). The positioning plate (416) is evenly processed with a plurality of air guide holes, and 3 to 5 springs (418) are evenly installed on the upper surface of the positioning plate (416). The upper end of the spring (418) is fixedly connected to the inner wall of the upper head (42) through a pull rod (419).

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