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Production method of dichlorosilane for preparing silane

A technology of dichlorodihydrogen silicon and a production method, which is applied in the directions of halogenated silanes, halogenated silicon compounds, etc., can solve the problem of reducing the separation efficiency of the rectifying tower, unbalanced gas-liquid distribution of the rectifying tower, and increasing the design and manufacture of the rectifying tower. Difficulty and other problems, to achieve the effect of high boiling point, easy recycling and energy saving

Active Publication Date: 2015-10-28
JIANGSU ZHONGNENG POLYSILICON TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reactive distillation method adopted in this patent easily leads to unbalanced gas-liquid distribution in the rectification tower, reduces the separation efficiency of the rectification tower, and increases the difficulty of design and manufacture of the rectification tower

Method used

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  • Production method of dichlorosilane for preparing silane
  • Production method of dichlorosilane for preparing silane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] use as figure 1 In the rectification tower shown, in the crude trichlorosilane raw material storage tank 2, trichlorosilane is added through the feed pipe 1, and the trichlorosilane is transported into the rectification tower 10 through the pump 5, and the gas at the top of the tower is passed through Part of the reflux enters the rectification tower 10 after the cooling of the tower top cooler 8 of the rectification tower 10, and the part is taken out as the purified dichlorodihydrosilane product, and the ionic liquid in the tower still reboiler 6 of the rectification tower 10 After the trichlorosilane and silicon tetrachloride are mixed, they are taken out and recovered by the pump 7, and the recovered ionic liquid is added to the rectification tower still 6 as a supplementary catalyst, and the trichlorosilane is returned to the storage tank 2 as a raw material.

[0026] In the above scheme, the ionic liquid cation used is hexyltriethylammonium ion, the anion is N(CN)...

Embodiment 2

[0028] use as figure 2 In the rectification tower shown, in the crude trichlorosilane storage tank 2, trichlorosilane is added through the feed pipe 1, and the trichlorosilane is transported into the rectification tower 10 through the pump 5, and the gas at the top of the tower is refined The top cooler 8 of the distillation tower 10 cools and partly refluxes into the rectification tower 10, partly takes out as the purified dichlorodihydrosilane product, and the three ions containing the ionic liquid in the tower kettle reboiler 6 of the rectification tower 10 After the silicon chloride and silicon tetrachloride are mixed, they are taken out and recovered by the pump 7, and the recovered ionic liquid is added to the rectification tower still 6 as a supplementary catalyst, and the trichlorosilane is returned to the storage tank 2 as a raw material.

[0029] In the above scheme, the ionic liquid cation used is 1-ethyl-3-methylimidazolium ion, the anion is (C2F5SO2)2N-, and the ...

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PUM

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Abstract

The invention relates to a production method of dichlorosilane for preparing silane; the method comprises the steps of in a tower kettle of a reaction rectification tower, carrying out disproportionation on a raw material trichlorosilane, carrying out rectification separation and extracting the prepared dichlorosilane through the tower top; the production method is characterized in that reaction and separation are coupled, and catalytic disproportionation is carried out to obtain the dichlorosilane product with the content of more than or equal to 90%, wherein a catalyst is an ionic liquid catalyst. By using the method, dichlorosilane can be prepared simply and efficiently, whole-process materials are in closed cyclic utilization, and the method has no pollution emission and is environmentally friendly.

Description

technical field [0001] The invention relates to the preparation of high-purity elemental silicon, in particular to a method for producing and purifying dichlorodihydrogensilane for preparing silane. Background technique [0002] Polycrystalline silicon is the main raw material for manufacturing semiconductor devices and photovoltaic solar cells. Due to climate change, the world is actively developing and utilizing various renewable low-carbon energy sources. Due to its cleanness, safety, and abundant resources, solar energy has attracted the most attention among renewable low-carbon energy sources. One way to harness solar energy is by converting it into electricity through the photovoltaic effect. Silicon solar cells are the most commonly employed devices based on the photovoltaic effect. In addition, due to the development of the semiconductor industry and solar cells, the demand for high-purity polysilicon is increasing. [0003] Among the methods of manufacturing high...

Claims

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Application Information

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IPC IPC(8): C01B33/107
Inventor 陈其国于伟华陈文龙
Owner JIANGSU ZHONGNENG POLYSILICON TECH DEV
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