Novel method for preparing emthyl chlorosilane by cracking organosilicon high-boiling product

Abstract

The invention discloses a novel method for preparing methyl chlorosilane by cracking organosilicon high-boiling components. The method uses organosilicon high-boiling components as raw materials. The organosilicon high-boiling components are taken as raw materials and gradually added into a cracking reaction kettle containing a mixture of chlorine hydride gas heated by method of jacket steam method and triethylamine serving as a catalyst. The organosilicon undergoes a Si-Si bond rearrangement reaction with the chlorine hydride gas in the presence of the catalyst of triethylamine to give an organic silicon monomer mixture which is mainly dichlorodimethylsilane. The cracking reaction is carried out in the reaction kettle at normal pressure and a temperature of between 100 DEG C and 110 DEGC. The molar ration of the organosilicon high-boiling components to the chlorine hydride gas is 1 to 1-1.2. The added catalyst of triethylamine accounts for 0.9 to 1.1 percent of the weight of the organosilicon high-boiling components. The method can conduct continuous cracking of high boiling components. The invention has the advantages of providing a method for preparing methyl chlorosilane by cracking organosilicon high-boiling components which is simple in process, high in safety, low in reaction temperature, high in selectivity of dichlorodimethylsilane and little in residual waste.

Description

Technical field [0001] The invention relates to a method for preparing methyl chlorosilane by cracking organic silicon high boiling substances. Background technique [0002] During the synthesis process of the production of silicone mixed monomers, high boilers accounting for 5% of the total monomers are produced. If these high boiling substances are not treated, a large amount of pressure storage will be caused. After the warehouse is enlarged, it will bring environmental and safety problems and cause a lot of waste of resources. Many countries have proposed some methods or processes for the treatment and utilization of high boiling substances, most of which are produced by the cracking reaction method to produce products such as methylchlorosilane. In various existing technologies, some methylchlorosilane has a low conversion rate, some need to be carried out under high temperature and high pressure, which results in high equipment requirements, and some use catalysts with hi...

AI Technical Summary

Problems solved by technology

Among various existing technologies, some methylchlorosilanes have a low conversion rate, some need to be carried out at high temperature and high pressure, resulting in high requirements for equipment, and some use catalysts with high costs.