Method for preparing polysilicon

A technology of polysilicon and silane, which is applied in the direction of chemical instruments and methods, silicon compounds, sustainable manufacturing/processing, etc., can solve the problems that the preparation method of polysilicon needs to be improved, and achieve the effect of improving efficiency, high efficiency, and reducing costs

Active Publication Date: 2015-12-02
CHINA ENFI ENGINEERING CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the preparation method of polysilicon still needs to be improved at this stage

Method used

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  • Method for preparing polysilicon
  • Method for preparing polysilicon
  • Method for preparing polysilicon

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Experimental program
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preparation example Construction

[0095] 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.

[0096] 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

[0119] use Figure 3-Figure 11 device shown, refer to figure 1 and figure 2 As shown in the flow process, according to the method for preparing polysilicon of the present invention, polysilicon is prepared according to the following process steps:

[0120] (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 the gas-liquid mixer in the gas-gas heat exchanger, and...

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Abstract

The invention discloses a method for preparing polycrystalline silicon. The method comprises the following steps: (a) performing hydrochlorination synthesis reaction on silicon powder, hydrogen and at least one selected from hydrogen chloride and silicon tetrachloride; (b) performing primary rectification purification treatment on a hydrochlorination synthesis reaction product containing trichlorosilane; (c) performing disproportionation on the trichlorosilane; (d) performing secondary rectification purification treatment on a disproportionation product; (e) performing pyrolytic reaction on silane gas in a reducing furnace to obtain the polycrystalline silicon. By using the method, the electronic-grade polycrystalline silicon can be effectively prepared; the method has the characteristics of simple process, safety, energy conservation, environmental friendliness and low cost; the produced polycrystalline silicon has high purity; the produced tail gas and waste residues can meet the environmental protection requirements; the method is an electronic-grade polycrystalline silicon clean production process.

Description

technical field [0001] The invention relates to the technical field of photovoltaic industry, in particular to a method for preparing polysilicon. 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. [0003] However, the preparation method of polysilicon still needs to be improved at this stage. Contents of the invention [0004] The present invention has been accomplished based on the following findings of the inventors: [0005] At present, there are many pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/035
CPCY02P20/10
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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