Cracking process of organosilicon high-boiling components

Abstract

The invention relates to a cracking process of organosilicon high-boiling components.. The cracking process is characterized in that organosilicon high-boiling components are used as raw materials and are subjected to impurity removal, N,N-dimethylaniline, N,N-diethylformamide or tri-n-butylamine are selected as a catalyst, the catalytic cracking is performed inside a reaction vessel to which hydrogen chloride gas is introduced, and finally, dimethyldichlorosilane, monomethyltrichlorosilane, monomethyldichlorosilane and trimethylchlorosilane are respectively recovered through a layered cooling tower at different temperatures. The cracking process has the advantages that the matching is reasonable, the operation is simple, the recovery ratio is high, and more than 60% of dimethyldichlorosilane product with high added value can be obtained.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of high boiling substances, in particular to a process for high boiling cracking of organic silicon. Background technique [0002] With the rapid development of domestic organosilicon technology, the output of methyl chlorosilane monomer is increasing, and a large amount of high-boiling point silane mixtures are produced. Because these high-boiling compounds are difficult to produce valuable organic chlorine by simple methods The commercial value of silane has always been low, which not only causes waste of raw materials but also pollutes the environment. Therefore, it is imminent to develop an effective industrial method for utilizing organosilicon high boilers. [0003] Silicone high boilers mainly contain 1,2-dimethyl-1,1,2,2-tetrachlorodisilane, 1,1,2 trichloro-1,2,2-trimethyldisilane, 1,2-dichloro-1,1,2,2-tetramethyldisilane, but the content of these four main substances is differen...

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Problems solved by technology

[0003] Silicone high boilers mainly contain 1,2-dimethyl-1,1,2,2-tetrachlorodisilane, 1,1,2 trichloro-1,2,2-trimethyldisilane, 1,2-dichloro-1,1,2,2-tetramethyldisilane, but the content of these four main substances is different due to different production processes and different manufacturers' equipment, and the content ratio is very different. This difference is for Finally, comprehensive utilization of 1,2-dimethyl-1,1,2,2-tetrachlorodisilane, 1,1,2 trichloro-1,2,2-trimethyldisilane, 1,2-dichloro -1,1,2,2-Tetramethyldisilane also has a significant effect on

CN101824047A improves the selectivity of dimethyldichlorosilane, not only improves the product yield, has less residual waste, but also solves the problem of utilization of high boilers, but the above three substances "1, 2-Dimethyl-1,1,2,2-tetrachlorodisilane, 1,1,2-trichloro-1,2,2-trimethyldisilane, 1,2-dichloro-1,1, The specific content of "2,2-tetramethyldisilane" has not been disclosed, so its product yield is relatively high and not comparable

[0005] Among dimethyldichlorosilane, monomethyltrichlorosilane, monomethylhydrogendichlorosilane and trimethylchlorosilane, dimethyldichlorosilane has the highest added value, usually the higher the recovery rate, the higher the comprehensive utilization efficiency High, the higher the added value, its recovery rate is difficult to break through 60% in production practice

[0006] At present, the catalytic cracking method is mainly used to convert organosilicon high boilers into methylchlorosilane monomers, but all kinds of single catalysts have shortcomings, or the catalytic effect is not good, or the requirements for process equipment are high, and many methods can only A single product is produced through a series of catalytic cracking reactions, which not only cannot solve the existing problem of material waste, but also causes high production costs, and even limits industrial continuous production