A low-pressure dimethyldichlorosilane hydrolysis system and process

Abstract

The invention provides a system for low-pressure dimethyl dichlorosilane hydrolysis and a process. The system comprises a hydrolysis reactor, a circulation pump, an analysis tower and a separator, wherein the outlet of the hydrolysis reactor is connected with the inlet of the analysis tower; the liquid phase outlet of the analysis tower is connected with the inlet of the separator; the water phaseoutlet of the separator is connected with the inlet of the circulation pump; the outlet of the circulation pump is connected with the inlet of the hydrolysis reactor; the pipeline between the circulation pump and the hydrolysis reactor is connected with a conveying pipeline of dimethyl dichlorosilane; the analysis tower comprises a distribution disc and a film formation component; the distribution disc is arranged at the middle and upper part inside the falling film analysis tower; liquid distribution holes are formed in the distribution disc; the film formation component is arranged below the distribution disc; the film formation component is composed of a plurality groups of 'inverted Y' shaped plates; the separator is of a vertically arranged cylindrical structure; a water phase outletis formed in the bottom of the separator; an oil phase outlet is formed in the top of the separator.

Description

technical field [0001] The disclosure relates to a low-pressure dimethyldichlorosilane hydrolysis system and process. Background technique [0002] The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] At present, there are two kinds of dimethyldichlorosilane hydrolysis processes in the domestic industry. One is azeotropic acid hydrolysis. The quality of the hydrolyzate obtained by this process is relatively good, but the energy consumption is large, and the by-product oily waste acid It is more difficult to handle, and this process method is basically no longer used in the industry. Another method is saturated acid hydrolysis (often referred to as "concentrated acid hydrolysis"). The inventors of the present disclosure have found that due to the relatively high reaction pressure and high acid concentration in this method, there is a dimethyldichlorosilane reaction. Incomplete, h...

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Problems solved by technology

[0003] At present, there are two kinds of dimethyldichlorosilane hydrolysis processes in the domestic industry. One is azeotropic acid hydrolysis. The quality of the hydrolyzate obtained by this process is relatively good, but the energy consumption is large, and the by-product oily waste acid Difficult to handle, this process is basically no longer used in the industry

Another method is saturated acid hydrolysis (often referred to as "concentrated acid hydrolysis"). The inventors of the present disclosure found that due to the relatively high reaction pressure and high acid concentration in this method, there is a dimethyldichlorosilane reaction. Incomplete, high terminal chlorine content, high viscosity of hydrolyzate, high acid value, so that the subsequent purification and washing system is more complicated to set up, and the process is relatively long, which increases investment and operating costs

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