Ternary copper catalyst CuO-Cu2O-Cu for synthesis of dimethyldichlorosilane and its preparation method

Abstract

The invention relates to the field of catalysts used for synthesis of dimethyldichlorosilane, in particular to a ternary copper catalyst CuO-Cu2O-Cu for synthesis of dimethyldichlorosilane and its preparation method. The method comprises the following steps of: 1) taking copper oxide powder as a raw material, adding a reducing gas, controlling its flow to make the flow of the reducing gas introduced into per gram of CuO particles at 0.1ml / min-100ml / min, maintaining the temperature at 100DEG C-600DEG C, carrying out a reduction reaction for 0.5h-6h, thus obtaining partially reduced copper oxide; and 2) subjecting the partially reduced copper oxide obtained in step 1) to breaking and ball-milling, thus obtaining the ternary copper catalyst for synthesis of dimethyldichlorosilane. With copper oxide as the raw material, the method prepares the ternary copper catalyst CuO-Cu2O-Cu through a one-step reaction, and has the advantages of simple technological process, convenient operation, strong process controllability, and easy mass production. The prepared catalyst shows high dimethyldichlorosilane selectivity and silicon powder material conversion rate.

Description

technical field [0001] The present invention relates to the field of the catalyst that is used for synthesizing dimethyldichlorosilane, specifically, the present invention relates to a kind of ternary copper CuO-Cu that is used for synthesizing dimethyldichlorosilane 2 O-Cu catalyst and its preparation method. Background technique [0002] In 1940, E.G. Rochow invented the technology of direct synthesis of methyl chlorosilane, which has simple process, high yield, no solvent, low risk and easy realization of continuous large-scale production. It is still the most economical methyl chloride in industry so far. Silane production pathways. [0003] Copper is a classic catalyst for the direct synthesis of methylchlorosilanes. The copper catalyst used for the direct synthesis of methylchlorosilane initially used electrolytic copper powder. Since the surface of the electrolytic copper powder is relatively dense and the specific surface area is small, it is difficult to form acti...

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Problems solved by technology

At present, there is a gap between the selectivity and catalytic activity of the domestic catalyst dimethyldichlorosilane compared with the catalyst of the US SCM company. The catalysts used in the synthesis of this monomer in the domestic organic silicon industry are mainly imported from abroad, resulting in high production costs; Monomer dimethyldichlorosilane has wide application, large demand, and high price, and a slight improvement in the performance of copper catalysts will generate huge economic benefits; therefore, the development of domestic copper catalysts with low prices, excellent quality, and stable performance is an organic Difficulties to be Solved Urgently in the Silicon Industry

[0006] At present, the research institute of Jilin Chemical Industry Co., Ltd. uses copper salt solution and metals more active than copper as raw materials. In a reactor with a gas bubbling device, a one-step method of reduction precipitation-suspension oxidation is used to directly prepare a Copper, copper oxide, and copper ternary copper catalysts have poor controllability of particle size and components, and the residual reducing agent Fe powder is difficult to remove

The ternary copper catalyst Cu-CuO-Cu prepared by copper sulfate dehydration drying, hydrogen reduction and partial oxidation researched by the Chengdu Organic Silicon Research Center of the Ministry of Chemical Industry 2 O, there is also the problem of poor controllability of catalyst particle size

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