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Method for preparing dichlorosilane

A technology of dichlorodihydrosilane and trichlorosilane, which is applied in the direction of halosilane and halide silicon compounds, can solve the problems that dichlorodihydrosilane needs to be improved, and achieve the effect of improving efficiency and ensuring reaction efficiency

Active Publication Date: 2013-11-27
CHINA ENFI ENGINEERING CORPORATION
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Problems solved by technology

[0003] However, at this stage, the method for preparing dichlorodihydrosilane by disproportionation of trichlorosilane still needs to be improved.

Method used

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  • Method for preparing dichlorosilane
  • Method for preparing dichlorosilane

Examples

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Embodiment 1

[0057] use figure 1 and figure 2 The shown equipment, according to the method for preparing dichlorodihydrosilane of the present invention, prepares dichlorodihydrosilane according to the following steps:

[0058] The tube side of the disproportionation reactor is filled with a weakly basic anion exchange resin—Albert's catalyst as a catalyst bed. After the replacement of the reactor is completed, the catalyst bed is first replaced with dry hot hydrogen gas until no water is detected in the hydrogen gas leaving the reactor.

[0059] Then trichlorosilane is passed into the lower end of the disproportionation reactor tube, and trichlorosilane passes through the catalyst bed from bottom to top at a flow rate of 4m / s, during which trichlorosilane undergoes a disproportionation reaction to produce dichlorodihydro Silicon and silicon tetrachloride, the reaction product is sent directly to the separation unit to separate dichlorodihydrogen silicon from the reaction product. Where...

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Abstract

The invention discloses a method for preparing dichlorosilane, which comprises the following steps: under the condition that anion exchange resin is taken as a catalyst, trichlorosilane is enabled to be in disproportionation reaction to obtain a reaction product containing silicon tetrachloride and dichlorosilane; dichlorosilane is separated from the reaction product. Through the application of the method, dichlorosilane is prepared safely and efficiently, the method is low in cost, low in reaction temperature and pressure, safe, easy to operate, strong in adaptability, and free from pollution, and the quality of prepared dichlorosilane is very good.

Description

technical field [0001] The invention relates to the technical field of polysilicon production, in particular to a trichlorosilane disproportionation process, and more specifically to a method for preparing dichlorodihydrosilane. Background technique [0002] At present, the production of polysilicon, the most important intermediate in the photovoltaic industry, is still based on the improved Siemens method, but the reduction conversion rate of trichlorosilane in this process is low, the amount of by-product silicon tetrachloride is high, and there is a large amount of material It is in a state of continuous recycling. So far, although the process has been continuously improved, the production cost has been reduced to a lower level, but there is not much room for decline. In addition, fierce competition among enterprises has resulted in low profitability of polysilicon produced by this process, requiring a new process route to reduce production costs and improve product quali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/107
Inventor 司文学严大洲肖荣晖汤传斌杨永亮
Owner CHINA ENFI ENGINEERING CORPORATION
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