Dimethyldichlorosilane hydrolysis process with desorption function

Abstract

The invention discloses a dimethyl dichlorosilane hydrolysis process with a desorption function, which comprises the steps of hydrolysis reaction, degassing treatment and multi-stage washing reaction, and is characterized in that a desalted water inlet is formed in a last-stage washing system of the multi-stage washing reaction step; desalted water entering from a desalted water inlet is used for washing the dimethyldichlorosilane hydrolysate in the last-stage washing system, and diluted hydrochloric acid formed by washing sequentially returns to the previous stages of washing systems to carry out multi-stage washing on the dimethyldichlorosilane hydrolysate in the previous stages of washing systems again. Diluted hydrochloric acid discharged from the first-stage water washing system is returned to the absorption tower in the degassing treatment step, hydrogen chloride gas entering the absorption tower is washed and absorbed to form concentrated hydrochloric acid, and the formed concentrated hydrochloric acid is returned to the hydrolysis mixer in the hydrolysis reaction step to be recycled. According to the method, the recovery rate of hydrogen chloride can reach 102% or above, the chlorine content of the dimethyldichlorosilane hydrolysate is controlled to be 1-10 ppmwt, and good economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of organic silicon production technology, and in particular relates to a dimethyldichlorosilane hydrolysis process with desorption function. Background technique [0002] Organosilicon products are known as "catalysts for scientific and technological development" and "industrial catalysts". They are widely used and develop rapidly. They are mainly methylsiloxane-derived products made from methylchlorosilane monomers, accounting for the total amount of organosilicon products. more than 90% wt of the amount. The methylchlorosilane monomer is mainly dimethyldichlorosilane, accounting for more than 90% wt of the methylchlorosilane monomer. The series of products derived from methylsiloxane are the conversion of dimethyldichlorosilane into hundreds of basic chemical products through hydrolysis and other technologies, which are widely used in aerospace, electrical and electronic, construction, transportation, che...

AI Technical Summary

Problems solved by technology

[0005] In order to solve technical problems such as the low recovery efficiency of hydrogen chloride in dimethyldichlorosilane and the difficulty in controlling the hydrolysis process in the background technology, the purpose of the present invention is to provide a reasonable process route, controllable reaction process, high hydrogen chloride recovery rate, Dimethyldichlorosilane hydrolysis process with desorption function and low operating cost

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