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Method and device for improving hydrogenation of silicon tetrachloride

A technology of silicon tetrachloride and hydrogenation reactor, applied in the directions of halogenated silicon compounds, halogenated silanes, etc., can solve the problems of unsatisfactory impurity removal effect, high cost of reaction raw materials, etc., and achieve the effect of reducing complicated steps and reducing reaction cost.

Inactive Publication Date: 2013-01-30
内蒙古锋威硅业有限公司
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Problems solved by technology

[0011] In order to solve the technical problems of high cost of reaction raw materials and unsatisfactory removal of impurities in the existing hydrochlorination method, the present invention provides an improved method and device for hydrogenation of silicon tetrachloride with simple and convenient operation, continuous stability, energy saving and consumption reduction

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  • Method and device for improving hydrogenation of silicon tetrachloride
  • Method and device for improving hydrogenation of silicon tetrachloride

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Embodiment

[0025] Embodiment: An improved method for hydrogenation of silicon tetrachloride, the method steps are as follows: (1) Metal silicon powder with an average particle size of 0.3-0.6 mm and a purity of 95-98% is heated to nitrogen gas by an external heating device 200-300°C, the heated nitrogen gas directly contacts the silicon powder without nickel catalyst to raise the temperature of the silicon powder to 200-300°C, and the heated and dried silicon powder is sent into the hydrogenation reactor through the pipeline. The height of the hydrogenation reactor is 2-3m.

[0026] (2) ① Vaporize and heat silicon tetrachloride through an external heating device, and the formation temperature is 500-550°C. silicon tetrachloride gas. ②Preheat the hydrogen chloride gas to 500-550°C through an external heating device. ③. Preheat the hydrogen to 500-550°C through the heater. Among them, silicon tetrachloride and hydrogen chloride are waste liquid and waste gas produced during the producti...

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Abstract

The invention discloses a method and device for improving the hydrogenation of silicon tetrachloride. The method comprises the following steps: flatly spreading metallic silicon powder of which the purity is 95-98% in a hydrogenation reactor, continuously introducing preheated silicon tetrachloride gas, hydrogen gas and hydrogen chloride gas, and reacting to obtain mixed gas A; enabling the mixed gas A to be sequentially subjected to dry dust removal and wet dust removal to obtain mixed gas B; cooling the mixed gas B until mixed liquid C is obtained; and transferring the mixed liquid C to a rectification device, and separating. The device disclosed by the invention comprises the hydrogenation reactor, a dry dust removal device, a heat recovery device, a wet dust removal device, a cooling device, a liquid storage tank and the rectification device which are sequentially connected, wherein the liquid storage tank is also connected to the wet dust removal device. The method and the device for improving the hydrogenation of silicon tetrachloride, provided by the invention, have the advantages of simple and convenient operation process, high continuity and stability, energy saving and consumption reduction.

Description

technical field [0001] The invention belongs to the technical field of a method and a device for treating industrial waste by using a chemical method, and in particular relates to an improved method for hydrogenating silicon tetrachloride and a device thereof. Background technique [0002] The rapid development of the contemporary photovoltaic industry has also brought about a shortage of resources. For example, polysilicon, the raw material for solar cells, is in short supply. Therefore, polysilicon manufacturers continue to increase and their scale continues to expand. At present, most of the polysilicon manufacturers in my country adopt the improved method of Siemens. Although the method of producing polysilicon by Siemens has become mature, the by-product silicon tetrachloride 12-16 can be produced at the same time as one ton of polysilicon is produced. Ton, silicon tetrachloride is a colorless, transparent and toxic liquid with an unpleasant suffocating smell, and it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/107
Inventor 赵纯源
Owner 内蒙古锋威硅业有限公司
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