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Method for preparing methyl hydrogen silicone oil from organic silicon by-product

A technology of methyl hydrogen-containing silicone oil and monomethyldichlorosilane, which is applied in the field of preparation of methyl hydrogen-containing silicone oil, can solve the problems of affecting the quality of hydrolysis, affecting the quality of products, and low investment costs, so as to reduce production costs and improve the effect of hydrolysis The effect of optimizing and reducing the cost of industrial production

Active Publication Date: 2015-11-25
HUBEI XINGRUI SILICON MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method has simple process equipment and low investment cost. However, due to the inconsistent hydrolysis speed of monomethyldichlorosilane and trimethylmonochlorosilane, uneven mixing will directly affect the quality of hydrolysis, thereby affecting product quality. In addition, the reactor stirring device The sealing surface is easily damaged in a strong acid environment and other factors also limit the use of this technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add the recovered washing acid water into the enamel reactor, turn on the cooling device of the reactor and blow back the compressed air at the bottom of the reactor; mix 1000kg of monomethyldichlorosilane and 10kg of trimethylmonochlorosilane with a static mixer and add them dropwise To the reaction kettle, maintain the temperature in the kettle at 15±5°C; after the hydrolysis reaction is completed, transport the hydrolyzed product to the standing high-level tank, and let it stand for 30 minutes to separate the lower layer of acid water to obtain crude methyl hydrogen-containing silicone oil; use process water After washing the crude methyl hydrogen-containing silicone oil for 3 times, neutralize it with sodium bicarbonate to a pH value of about 6-7, filter, and remove the medium and low levels of the silicone oil at a vacuum degree of 80±5KPa and a temperature of 120±5°C. Molecule, after 3 hours, the finished product of methyl hydrogen silicone oil can be obtained, of ...

Embodiment 2

[0020] Other implementation conditions are the same as 1, when the end-capping agent trimethyl-chlorosilane is 20kg, the obtained methyl hydrogen-containing silicone oil

[0021] Hydrogen content: 1.55%, refractive index (25°C): 1.4048, viscosity (25°C, mm 2 / s): 22, specific gravity: 0.9945, volatile matter: 2.584%.

Embodiment 3

[0023] Other implementation conditions are the same as 1. When the end-capping agent trimethyl-chlorosilane is 5kg, the hydrogen content of the obtained methyl hydrogen-containing silicone oil: 1.61%, refractive index (25°C): 1.4021, viscosity (25°C, mm 2 / s): 35, specific gravity: 0.9949, volatile matter: 2.576%.

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Abstract

The invention relates to a method for preparing methyl hydrogen silicone oil from an organic silicon by-product. The method comprises the steps of carrying out cohydrolysis reaction under certain conditions by virtue of the organic silicon by-product, namely dichloromethylsilane, an end-capping agent, namely chlorotrimethylsilane and recycled washing dilute acid, carrying out back flushing by virtue of compressed air so as to remove hydrogen chloride produced during hydrolysis, standing for layering after the reaction is finished, carrying out washing deacidification on an upper solution for multiple times, and carrying out neutralization, filtration and devolatiligation procedures on products, so as to obtain finished methyl hydrogen silicone oil. Practices prove that methyl hydrogen silicone oil prepared by virtue of the method has controllable viscosity and stable quality and is easy to industrialize, and the comprehensive utilization value of the organic silicon by-product, namely dichloromethylsilane is greatly increased.

Description

technical field [0001] The invention belongs to the technical field of organosilicon by-product production, and in particular relates to a method for preparing methyl hydrogen-containing silicone oil by utilizing organosilicon by-product monomethyldichlorosilane. Background technique [0002] With the rapid development of the organosilicon industry, the output of organosilicon chlorosilane monomers is also increasing. It is estimated that by the end of this year, the total production capacity of domestic organosilicon monomer manufacturers will be about 2500kt / a. Monomethyldichlorosilane is one of the by-products of organosilane chlorosilane monomer production, accounting for about 1.5% of the monomer production capacity. The boiling point at normal pressure is only 41.1°C, and the explosion limit ranges from 6 to 55%. The summer temperature is too high It is easy to produce vaporization and cause safety accidents; the substance contains Si-Cl and active Si-H bonds inside, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/12C08G77/34
Inventor 王文金胡丹汪民康黄潇
Owner HUBEI XINGRUI SILICON MATERIAL CO LTD
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