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Method for preparing dimethyl dichlorosilane

A technology for dimethyldichlorosilane and trimethylchlorosilane, which is applied in the field of preparing dimethyldichlorosilane, can solve the problems of strict equipment requirements, difficult separation of impurities, low safety performance, etc., and achieves convenient distillation and purification. , easy industrialization, simple operation effect

Active Publication Date: 2015-09-30
JIAXING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the organosilicon by-product disproportionation reactions reported at home and abroad mainly include organosilicon high boiler hydrocracking disproportionation, disproportionation conversion of trimethylchlorosilane and high boiler, disproportionation conversion of trimethylchlorosilane and low boiler, Disproportionation of trimethylchlorosilane and tetramethylsilane, etc., the reaction temperature of the above method is between 200-350°C, the pressure is between 3-10MPa, and some reactants are also doped with methyl hydrogen-containing dichlorosilane, etc. , the required high temperature and high pressure conditions have strict requirements on the equipment, and the safety performance is low
Subsequent separation of impurities is difficult, so finding a method for synthesizing dimethyldichlorosilane with mild conditions is an urgent problem for the silicone industry

Method used

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  • Method for preparing dimethyl dichlorosilane
  • Method for preparing dimethyl dichlorosilane
  • Method for preparing dimethyl dichlorosilane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 100kg of methyltrichlorosilane, 40kg of trimethylchlorosilane, 60kg of azeotrope, 40kg of tetramethylsilane and 1.8kg of aluminum trichloride into the disproportionation reactor, start stirring, raise the temperature to 120°C, react for 8h, and react After the completion, the crude product of dimethyldichlorosilane was obtained by rectification, and the content of the crude product detected by gas chromatography was 85.1%, and the yield of the crude product was about 75.2%.

Embodiment 2

[0042] Add 100kg of methyltrichlorosilane, 50kg of trimethylchlorosilane, 70kg of azeotrope, 50kg of tetramethylsilane and 3.0kg of aluminum trichloride into the disproportionation reactor, start stirring, raise the temperature to 170°C, and react for 12 hours. After the completion, the crude product of dimethyldichlorosilane was obtained by rectification. The content of the crude product detected by gas chromatography was 86.8%, and the yield of the crude product was about 82.7%.

Embodiment 3

[0044] Add 100kg of methyltrichlorosilane, 50kg of trimethylchlorosilane, 60kg of azeotrope, 40kg of tetramethylsilane and 2.9kg of aluminum trichloride into the disproportionation reactor, start stirring, raise the temperature to 150°C, and react for 12 hours. After the completion, the crude product of dimethyldichlorosilane was obtained by rectification, and the content of the crude product detected by gas chromatography was 91.8%, and the yield of the crude product was about 86.7%.

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Abstract

The invention discloses a method for preparing dimethyl dichlorosilane, which is implemented through carrying out disproportionation reaction on methyl trichlorosilane, trimethylchlorosilane, azeotrope and tetramethylsilane under the catalysis of aluminum chloride, and carrying out rectification treatment after the disproportionation reaction is completed, so that dimethyl dichlorosilane is obtained, wherein the mass ratio of methyl trichlorosilane to trimethylchlorosilane to azeotrope to tetramethylsilane is 1:(0.3-0.5):(0.6-0.8):(0.4-0.6), the temperature of the disproportionation reaction is 100-180 DEG C, and the reaction time is 4-16 h. The method for preparing dimethyl dichlorosilane, disclosed by the invention, is mild in conditions, simple in operation, high in product purity, safe and stable in synthesis process, low in energy consumption, and easy to realize industrialization.

Description

technical field [0001] The invention relates to the technical field of organosilicon, in particular to a method for preparing dimethyldichlorosilane. Background technique [0002] Organosilicon materials are an important part of the new chemical material industry and an important basic material required for the development of the seven strategic emerging industries proposed by the State Council. Organosilicon materials are mainly a kind of polymer compound with Si-O bond as the main chain, and then introduce organic groups as side chains on Si. It has excellent performance and unique functions, and is widely used in military industry, aerospace, medical treatment, chemical industry, etc. field. The key to the development of silicone materials lies in the development of monomer technology. Methylchlorosilane monomer is the main raw material for the synthesis of silicone materials, while dimethyldichlorosilane is the most widely used silicone monomer. [0003] There are many...

Claims

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Application Information

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IPC IPC(8): C07F7/12
Inventor 谭军方红承欧阳玉霞彭金鑫聂长虹母清林
Owner JIAXING UNIV
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