Method for monitoring cracking reaction of dimethyldichlorosilance hydrolyzates

A technology of dimethyldichlorosilane and cracking reaction, applied in the directions of silicon organic compounds, measuring devices, instruments, etc., can solve the problems of inability to guarantee product quality, high safety risks, etc., so as to reduce the risk of safety accidents and reduce safety risks , the effect of improving quality

Inactive Publication Date: 2014-07-30
LUZHOU NORTH CHEM IND
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the prior art, the dry method is used to crack the dimethyldichlorosilane hydrolyzate, which not only has a high safety risk in the production process, but also cannot guarantee the quality of the product

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  • Method for monitoring cracking reaction of dimethyldichlorosilance hydrolyzates
  • Method for monitoring cracking reaction of dimethyldichlorosilance hydrolyzates
  • Method for monitoring cracking reaction of dimethyldichlorosilance hydrolyzates

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Embodiment 1

[0053] In practice, the non-condensable gas in the cracking system is monitored regularly or irregularly, and the monitoring targets are selectively on hydrogen, oxygen, nitrogen and methane gas. The SC-3000B gas chromatograph was used to analyze the non-condensable gas. The data integration method was the height external standard method, the detector was FID, the sampler was split flow, and the column temperature was programmed temperature rise, respectively at 128°C, 132°C and At 250°C, the chromatogram of non-condensable gas is obtained as Figures 3a-3c shown. However, depending on the retention time, Figures 3a-3c The components represented by each peak in turn are hydrogen, oxygen, nitrogen and methane.

[0054] Specifically, when the content of hydrogen and methane in the noncondensable gas of the cracking system is above the threshold value and below the upper limit value, the content of hydrogen and methane is reduced by adjusting the reaction temperature, catalyst...

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Abstract

The invention relates to a method for monitoring the cracking reaction of dimethyldichlorosilance hydrolyzates. The invention aims to solve the technical problem that in the prior art, dimethyldichlorosilance hydrolyzates are cracked by using a dry method, so that high security risks exist in the process of production, and the quality of products can not be guaranteed. The technical scheme for solving the technical problem is as follows: the method for monitoring the cracking reaction of dimethyldichlorosilance hydrolyzates comprises the following steps: carrying out the cracking reaction of dimethyldichlorosilance hydrolyzates to obtain non-condensable gas produced in the cracking reaction; detecting the non-condensable gas by using a gas chromatograph so as to obtain a detection result; and based on the detection result, controlling the reaction conditions of the cracking reaction. The method disclosed by the invention has the beneficial effects that non-condensable gas is detected by using a gas chromatograph, and the reaction conditions of the cracking reaction is controlled according to a detection result, thereby reducing the security risks of the reaction, and improving the quality of products.

Description

technical field [0001] The invention relates to a cracking process of a dimethyldichlorosilane hydrolyzate, in particular to a method for monitoring the cracking reaction of a dimethyldichlorosilane hydrolyzate. Background technique [0002] Dimethylsiloxane mixed ring (DMC) is the main raw material in silicone products. At present, its main production method is: hydrolyzing dimethyldichlorosilane, and cracking and collecting the hydrolyzate under the action of an alkaline catalyst The ring body is then reisolated to give DMC. The cracking of the hydrolyzate is to carry out the cracking and rearrangement reaction of the hydrolyzate under the action of a basic catalyst to obtain a cracking product containing about 80% of D4, about 5% of D3 and about 15% of D5, wherein the cracking reaction The process will contain (CH 3 ) SiO 1.5 Or Si-H and other siloxanes are converted into silanol potassium salts and stay at the bottom of the reactor, taking away the product to purify t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/08G01N30/02
Inventor 明瑞杨王金龙詹栋刘明伟陆洪刚
Owner LUZHOU NORTH CHEM IND
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