Additive capable of improving utilization rate of silicon power in synthesis of methyl chlorosilane

Abstract

The invention discloses an additive capable of improving utilization rate of silicon power in synthesis of methyl chlorosilane. The additive is characterized by being prepared from the following components in parts by weight through mixing: 30-70 parts of an oxide, 25-50 parts of silicon powder, 4.5-15 parts of copper powder and 0.5-5 parts of zinc powder, wherein the average particle size of the additive is 70-100mm and the weight ratio of silicon oxide to aluminum oxide to calcium oxide in the oxides is (82-87) to (7-13) to (3-7). At the later stage of a reaction between silicon powder and chloromethane in a fluidized bed, by adopting the reaction additive disclosed by the invention, the intensity of the reaction in the fluidized bed is effectively controlled and thus the quality of the reaction product can be ensured, and meanwhile, since silicon powder is in full contact with chloromethane, the conversion rate of silicon powder is improved, the generation of waste silicon powder is reduced and therefore the production benefits are further increased.

Description

technical field [0001] The invention relates to an additive for improving the utilization rate of silicon powder in the synthesis of methylchlorosilane. Background technique [0002] Organosilicon materials (silicones) are a class of new materials with excellent performance, unique functions and a wide range of uses. They belong to one of the three industries with the largest industrial scale in new chemical materials along with engineering plastics and organic fluorine materials. The main products include silicone oil, silicone rubber, silicone resin, silane coupling agent and silicone surface active agent, coating, foam stabilizer, etc. Silicone monomers are mainly used in the production of silicone materials, and are the foundation and key of the entire silicone industry. [0003] The production process of organosilicon monomer is complex, long process and high technical content. The catalyst system for the synthesis of methylchlorosilane monomer is mainly divided into ...

AI Technical Summary

Problems solved by technology

[0005] At present, the production process of organosilicon monomer mainly uses silicon powder and methyl chloride to react in a fluidized bed to synthesize methylchlorosilane. The silicon powder is processed and ground into a certain particle size by raw silicon block and then participates in the reaction. During the reaction with methyl chloride The particle size gradually becomes smaller. During the normal production process, it is adjusted by adding silicon powder to maintain a reasonable average particle size and fluidization state in the fluidized bed. With the extension of the operating cycle, the silicon powder impurities in the fluidized bed gradually increase, affecting The quality of the product needs to be restarted. In order to save the consumption of silicon powder, most enterprises will squeeze the fine powder collected during the operation for use. Incomplete, a large amount of silicon powder contacts are produced for sale at a reduced price

[0006] The catalyst system of the existing silicon powder and methyl chloride reaction in the fluidized bed mainly contains ternary copper, and the particle size is small, about 2 μm. This type of catalyst is used in the drying process of the late stage of the fluidized bed reaction, which will make the methyl The reaction of chlorosilane is more violent, and the product quality is difficult to control