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Method for purifying silane

A technology of silane and chlorosilane, which is applied in the field of photovoltaic industry, can solve the problems of silane that needs to be improved, low silane purity, and many impurities in the product, and achieve the effects of safe reaction, improved efficiency, and high efficiency

Active Publication Date: 2013-12-18
CHINA ENFI ENGINEERING CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process for preparing silane at this stage has many impurities in the product and the purity of silane is low, so further purification is required
[0003] However, the current method of purifying silane still needs to be improved

Method used

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  • Method for purifying silane

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preparation example Construction

[0092] The above part has described the method for preparing polysilicon of the present invention in detail. In order to better understand the method, the equipment capable of implementing the method will be described in detail below.

[0093] Therefore, according to another aspect of the present invention, the present invention also proposes an equipment for preparing polysilicon. According to an embodiment of the present invention, refer to image 3 , The equipment for preparing polysilicon of the present invention includes: a hydrochlorination synthesis reaction device 1 , a first rectification purification device 2 , a disproportionation reaction device 3 , a second rectification purification device 4 and a pyrolysis reaction device 5 . According to some embodiments of the present invention, the hydrochlorination synthesis reaction device 1 is used to make silicon powder, hydrogen, and at least one selected from hydrogen chloride and silicon tetrachloride undergo a hydroch...

Embodiment 1

[0116] use Figure 3-Figure 11 device shown, refer to figure 1 and figure 2 As shown in the process, according to the method for preparing polysilicon of the present invention, silane is prepared and purified according to the following process steps, and then electronic grade polysilicon is prepared:

[0117] (1) Synthesis step of hydrochlorination: Silicon tetrachloride and hydrogen from the following steps (2) and (3) are mixed in a gas-liquid mixer, then exchange heat with the hydrogenation reactor outlet gas, and enter resistance heating Heating to a certain temperature, the mixed gas directly enters the hydrogenation reactor, the temperature is controlled at 500-550 degrees, the pressure is 1.5-3.5MPa, the ratio of silicon tetrachloride to hydrogen is 1:2-1:5, nickel-based or copper-based Under the action of catalyst, it reacts with silicon powder. After the reaction gas passes through the high-efficiency gas-solid dust collector, it exchanges heat with the gas from t...

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Abstract

The invention discloses a method for purifying silane. The method comprises the step of performing second rectification and purification treatment on the silane so as to obtain a purified silane gas and silicon tetrachloride, wherein the silane is provided in the form of a disproportionated reaction product; the second rectification and purification treatment is carried out in a low-temperature rectifying tower, wherein the temperature in the low-temperature rectifying tower ranges from -60 DEG C to -80 DEG C and the pressure in the tower ranges from 0.6 MPa to 1.0 MPa; the reflux ratio is (5: 20): 1. Due to the utilization of the method, the silane can be effectively purified; the method is simple in process, safe, energy-saving and environment-friendly, and low in cost; the purified silane is high in purity and the generated wastes can be recycled.

Description

technical field [0001] The invention relates to the technical field of photovoltaic industry, in particular to a method for purifying silane. Background technique [0002] As a renewable and clean energy source, solar energy has attracted global attention, and the technology of using solar energy resources to generate electricity has been considered as the most promising new energy technology in the world today. Therefore, the photovoltaic industry with solar power generation technology as the core has developed rapidly in the early 21st century. As the main raw material of the photovoltaic industry, polysilicon has seen a sharp increase in demand with the rapid development of the photovoltaic industry. Furthermore, the demand for silane, the main raw material for the production of polysilicon, has also increased. However, the current process for preparing silane has many impurities in the product and the purity of silane is low, so further purification is required. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/04
Inventor 万烨张升学严大洲毋克力肖荣辉汤传斌杨永亮
Owner CHINA ENFI ENGINEERING CORPORATION
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