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Process for the preparation of silanes

A technology of silane and dichlorodihydrogen silicon, which is applied in the directions of halogenated silane, hydride silicon, halogenated silicon compound, etc., can solve the problem that silane needs to be improved, and achieve the effect of improving efficiency, reducing the effect and ensuring the reaction efficiency.

Active Publication Date: 2015-08-05
CHINA ENFI ENGINEERING CORPORATION
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  • Abstract
  • Description
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Problems solved by technology

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

Method used

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  • Process for the preparation of silanes
  • Process for the preparation of silanes

Examples

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Embodiment 1

[0057] use figure 1 with figure 2 The shown equipment, according to the method for preparing silane of the present invention, prepares silane 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 dichlorodihydrosilane is passed into the lower end of the disproportionation reactor tube, and dichlorodihydrosilane passes through the catalyst bed from bottom to top at a flow rate of 4m / s, and in this process, dichlorodihydrosilane undergoes a disproportionation reaction to produce three Chlorosilane and silane, the reaction product is sent directly to the separation unit to separate the silane from the reaction product. Among them, the reaction temperature in the ...

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Abstract

The invention discloses a method for preparing silicane, which comprises the following steps: under the condition that anion exchange resin is taken as a catalyst, dichlorosilane is enabled to be in disproportionation reaction to obtain a reaction product containing trichlorosilane and silicane, and silicane is separated from the reaction product. Through the application of the method, silicane can be 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, the dichlorosilane conversion rate is high, and the quality of prepared silicane is very good.

Description

technical field [0001] The invention relates to the technical field of polysilicon production, in particular to a dichlorodihydrosilane disproportionation process, and more specifically to a method for preparing silane. 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 quality. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/107C01B33/04
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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