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CN-117531216-B - Silane reaction rectifying tower for improving productivity and working method thereof

CN117531216BCN 117531216 BCN117531216 BCN 117531216BCN-117531216-B

Abstract

The invention discloses a silane reaction rectifying tower for improving productivity and a working method thereof, wherein the upper section of the rectifying tower is a rectifying section, the middle section is a reaction section, the lower section is a stripping section, the top of the rectifying tower is provided with a condenser, the tower bottom of the rectifying tower is provided with a reboiler, the reaction section is provided with a plurality of sections, the reaction sections are provided with a distributor and a catalyst, the adjacent parts of the reaction sections are provided with filling sections, the bottom of the filling sections is provided with an oil collecting tank and an overflow device, and the oil collecting tank and the overflow device are connected with the distributor in the lower reaction section.

Inventors

  • XU YUE
  • YANG HAO

Assignees

  • 江苏中能硅业科技发展有限公司

Dates

Publication Date
20260505
Application Date
20231201

Claims (6)

  1. 1. The silane reaction rectifying tower for improving productivity is characterized in that the upper section of the rectifying tower is a rectifying section (1), the middle section of the rectifying tower is a reaction section (2), the lower section of the rectifying tower is a stripping section (3), a condenser (4) is arranged at the top of the rectifying tower, a condensing pipe is arranged at one end of the condenser (4) and is connected with the top of the rectifying tower, a return pipe is arranged at one end of the condenser (4) and returns to the rectifying section (1), an outlet pipe is arranged at the other end of the condenser (4) and is connected to the outside of the rectifying tower, a reboiler (5) is arranged at the tower bottom of the rectifying tower, an inlet pipeline of the reboiler (5) is connected with the bottom of the stripping section (3), the outlet pipeline of the reboiler (5) returns to the stripping section (3), a plurality of sections are arranged in the reaction section (2), a filling section (6) is arranged at adjacent positions of the multi-section reaction section (2), an oil collecting tank (7) and an overflow device are arranged at the bottom of the filling section (6), and the overflow device (7) and the overflow device (22) are connected with the overflow section (2) in the lower section; The lower part of the oil collecting tank (7) is provided with a byproduct extraction pipeline (8), and the oil collecting tank (7) is connected with a distributor (22) in the lower reaction section (2) through the byproduct extraction pipeline (8); the overflow device is arranged in a height position set in the oil collecting tank (7), the top of the overflow device is opened, the bottom of the overflow device is connected with an overflow pipeline, and the overflow device is communicated with a distributor (22) in the lower reaction section (2) through the overflow pipeline; double-layer filler pieces are arranged in the filler section (6), and a catalyst (21) is arranged between the double-layer filler pieces.
  2. 2. The silane reactive distillation column for improving throughput of claim 1, wherein a flowmeter is provided on the overflow line, and a heat insulating layer is provided outside the overflow line.
  3. 3. The silane reactive rectifying column for improving productivity according to claim 1, characterized in that a tuning fork switch, a regulating valve and a thermometer are arranged on the oil collecting tank (7).
  4. 4. Silane-reaction rectifying column for increasing productivity according to claim 1, characterized in that the height of the oil collecting tank (7) is 800-1200mm under the packing section (6).
  5. 5. Silane-reaction rectifying column for increasing productivity according to claim 1, characterized in that the height of the inlet of the overflow means is 200-400mm inside the oil collection tank (7).
  6. 6. Silane-reaction rectifying column for increasing productivity according to claim 1, characterized in that the reaction section (2) is provided with three sections.

Description

Silane reaction rectifying tower for improving productivity and working method thereof Technical Field The invention relates to a silane reaction rectifying tower for improving productivity and a working method thereof, belonging to the technical field of rectifying towers. Background The silicon-based material is the most important base material in the electronic information industry and the solar photovoltaic power generation industry, and the polysilicon used for solar photovoltaic power generation at present is a high-efficiency, environment-friendly and clean new energy technology. The production process of polysilicon is more, but the main processes for realizing industrialization on a large scale are an improved Siemens method and a silane thermal decomposition method, and compared with the improved Siemens method for producing polysilicon, the silane thermal decomposition method has the advantages of simple flow, low decomposition temperature and low energy consumption, so that the silane method becomes more and more the main method for producing polysilicon, silane is taken as the main reaction raw material, the yield of the silane directly influences the yield of polysilicon products, the silane is mainly produced through a reaction rectification process at present, and how to improve the yield and the reaction efficiency of the silane in the reaction rectification process is the problem to be solved at present. Disclosure of Invention The invention aims to overcome the defects in the prior art and provide a silane reaction rectifying tower for improving the productivity and a working method thereof, which are used for improving the productivity and the reaction efficiency of silane in a reaction rectifying process. In order to achieve the above purpose, the invention is realized by adopting the following technical scheme: The invention provides a silane reaction rectifying tower for improving productivity, wherein the upper section of the rectifying tower is a rectifying section, the middle section of the rectifying tower is a reaction section, the lower section of the rectifying tower is a stripping section, a condenser is arranged at the top of the rectifying tower, one end of the condenser is provided with a condensing pipe which is connected with the top of the tower, one end of the condenser is provided with a return pipe which returns to the rectifying section, the other end of the condenser is provided with an outlet pipe which is connected with the outside of the rectifying tower, the tower kettle of the rectifying tower is provided with a reboiler, an inlet pipeline of the reboiler is connected with the bottom of the stripping section, an outlet pipeline of the reboiler returns to the stripping section, the reaction section is provided with a plurality of sections, a distributor and a catalyst are arranged in each section of the reaction section, the adjacent parts of the plurality of sections are provided with a filler section, the bottom of the filler section is provided with an oil collecting tank and an overflow device, and the oil collecting tank and the overflow device are connected with the distributor in the lower reaction section. Further, the lower part of the oil collecting tank is provided with a byproduct extraction pipeline, and the oil collecting tank is connected with a distributor in the lower reaction section through the byproduct extraction pipeline. Further, the overflow device is arranged at a preset height position in the oil collecting tank, the top of the overflow device is opened, the bottom of the overflow device is connected with an overflow pipeline, and the overflow device is communicated with a distributor in the lower reaction section through the overflow pipeline. Further, a flowmeter is arranged on the overflow pipe line, and an insulating layer is arranged outside the overflow pipe line. Further, a tuning fork switch, an adjusting valve and a thermometer are arranged on the oil collecting tank. Further, double-layer filler pieces are arranged in the filler section, and a catalyst is arranged between the double-layer filler pieces. Further, the height of the oil collecting tank is 800-1200mm below the filling section. Further, the height of the inlet of the overflow device is 200-400mm inside the oil collector. Further, the reaction section is provided with three sections. In a second aspect, the present invention provides a method of operating a silane reaction rectification column for increasing throughput according to any one of the preceding claims, comprising: The method comprises the steps of placing raw material trichlorosilane into a reaction rectifying tower from the upper part of a reaction section, continuously performing disproportionation reaction in the reaction section to generate dichlorosilane and monochlorosilane to finally generate silane and silicon tetrachloride, enabling gas-phase materials containing silane to enter the rectifying s