Method for utilizing silicon chloride to prepare phenyl-trichloro-silicane and diphenyl dichlorosilane through Gerber method

Abstract

The invention relates to a method for processing silicon chloride through Gerber method. The method solves the technical problem of preparing phenyl Grignard reagent under the condition without solvent, thereby selectively preparing phenyl-trichloro-silicane or diphenyl dichlorosilane. The method of the invention for processing silicon chloride comprises the following steps: firstly respectively feeding Mg and LiCl, or Mg and LiF or Mg and AIC13, and chlorobenzene and initiating agent (the Mole ratio between initiating agent bromoethane or iodine and metal magnesium is 1-5%) under the protection of nitrogen gas, reacting to prepare phenyl Grignard reagent, secondly, adding silicon chloride into the phenyl Grignard reagent added with solvent according to the Mole ratio between phenyl Grignard reagent and silicon chloride of 1:1 (or 2:1), thirdly, filtering suspension on the reaction solution, fourthly, distilling under normal pressure, collecting corresponding distillation cut, recovering chlorobenzene, then, rectifying, and obtaining phenyl-trichloro-silicane (obtaining diphenyl dichlorosilane).

Description

technical field [0001] The invention relates to the field of organic chemistry, in particular to a method for preparing phenyltrichlorosilane and diphenyldichlorosilane by using silicon tetrachloride in a Grignard method. Background technique [0002] Polysilicon is a key raw material for integrated circuits and photovoltaic power generation. With the rapid growth of polysilicon market demand at home and abroad, the domestic polysilicon production scale has expanded rapidly, and the recycling of polysilicon by-product silicon tetrachloride has become an important aspect of my country's polysilicon industry in energy conservation, emission reduction, and clean production. an important aspect of sustainable development. [0003] An effective way to solve the problem of polysilicon by-product silicon tetrachloride is to reduce the generation of silicon tetrachloride. Recently, TadaoIto et al. have proposed a vertical drum stirred bed reactor, and the stirring used is a screw ag...

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Problems solved by technology

[0004] On the basis of the existing polysilicon smelting technology in my country, it is impossible to avoid the generation of a large number of by-products of silicon tetrachloride

In the existing polysilicon by-product silicon tetrachloride recycling technology, the preparation of conventional Grignard reagents requires the use of ether compounds such as tetrahydrofuran or diethyl ether as solvents. It is easy to produce peroxygen compounds under certain conditions, which will cause an explosion, and there are certain potential safety hazards.

Gilman reported that a mixture of solid PhMgCl and chlorobenzene could be prepared by reacting excess chlorobenzene with magnesium metal in a closed tube, and then the mixture was dissolved in ether or tetrahydrofuran and reacted with silicon tetrachloride to prepare phenyltrichlorosilane and Diphenyldichlorosilane, but the reaction still needs to use an ether-soluble solvent, and the reaction selectivity is poor (phenyltrichlorosilane / diphenyldichlorosilane=2 / 5), which is not suitable for industrialized production (Gilman H.J.Am. Chem. Soc. 1930, 52, 3330)

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