Alcoholysis process for methyltrimethoxysilane

A technology of methyltrimethoxysilanol and methyltrichlorosilane, which is applied in the field of alcoholysis of methyltrimethoxysilane, can solve problems affecting the normal production of methyltrimethoxysilane, reactor clogging, etc., and achieve Avoid incomplete alcoholysis reaction, easy to operate, stable process effect

Active Publication Date: 2013-04-03
JIANGXI BLUESTAR XINGHUO SILICONE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The usual reaction temperature is 70-104 ° C, and at this temperature, hydrogen chloride and methanol will produce side reactions, HCl + CH 3 Oh CH 3 Cl+H 2 O, produce methyl chloride and water, and the water reacts with the main raw material methyltrichlorosilane for hydrolysis, so that the yield of methyltrimethoxysilane decreases, only about 90%, and the hydrolyzate of methyltrichlorosilane will cause the reactor 1. The blockage of the tower affects the normal production of methyltrimethoxysilane

Method used

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  • Alcoholysis process for methyltrimethoxysilane

Examples

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Comparison scheme
Effect test

Embodiment 1

[0015] A methyltrimethoxysilane alcoholysis process, the main equipment of which includes alcoholysis I tower, alcoholysis II tower, methanol vaporizer, reboiler, crude product receiver;

[0016] Among them, the alcoholysis I tower and the alcoholysis II tower are filled with non-metallic fillers; the non-metallic fillers are: ceramics;

[0017] A methyltrimethoxysilane alcoholysis process, comprising the following components by weight: 150 parts of methyltrichlorosilane, 100 parts of methanol;

[0018] The specific process is as follows:

[0019] 1) Incomplete alcoholysis reaction: Use a metering pump to drop 150 parts of methyltrichlorosilane and 65 parts of methanol into the alcoholysis I tower at a constant speed. The temperature in the tower is controlled at 28°C. Methyltrichlorosilane and methanol Disperse and mix under the action of fillers, carry out liquid-liquid phase alcoholysis reaction at room temperature, the by-product HCl overflows from the top of the alcoholy...

Embodiment 2

[0022] A methyltrimethoxysilane alcoholysis process, comprising the following components in weight ratio: 150 parts of methyltrichlorosilane, 90 parts of methanol;

[0023] The specific process is as follows:

[0024] 1) Incomplete alcoholysis reaction: Use a metering pump to drop 150 parts of methyltrichlorosilane and 60 parts of methanol into the alcoholysis I tower at a constant speed. The temperature in the tower is controlled at 15°C. Methyltrichlorosilane and methanol Disperse and mix under the action of fillers, carry out liquid-liquid phase alcoholysis reaction at room temperature, the by-product HCl overflows from the top of the alcoholysis I tower, and the incomplete alcoholysis generated by the reaction flows into the top of the alcoholysis II tower;

[0025] 2) Complete alcoholysis reaction: 30 parts of methanol is vaporized by the methanol vaporizer and then enters the alcoholysis II tower, and continues alcoholysis with the incomplete alcoholyzate flowing into th...

Embodiment 3

[0029] A methyltrimethoxysilane alcoholysis process, comprising the following components by weight: 150 parts of methyltrichlorosilane, 95 parts of methanol;

[0030] The specific process is as follows:

[0031] 1) Incomplete alcoholysis reaction: Use a metering pump to drop 150 parts of methyltrichlorosilane and 75 parts of methanol into the alcoholysis I tower at a constant speed. The temperature in the tower is controlled at 35 ° C. Methyltrichlorosilane and methanol Disperse and mix under the action of fillers, carry out liquid-liquid phase alcoholysis reaction at room temperature, the by-product HCl overflows from the top of the alcoholysis I tower, and the incomplete alcoholysis generated by the reaction flows into the top of the alcoholysis II tower;

[0032] 2) Complete alcoholysis reaction: 20 parts of methanol is vaporized by the methanol vaporizer and then enters the alcoholysis II tower, and continues alcoholysis with the incomplete alcoholyzate flowing into the al...

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Abstract

The invention relates to a continuous alcoholysis process for methyltrimethoxysilane. Alcoholysis is accomplished by double towers. Methyl trichlorosilane and methanol are dropwise added to the tower I for alcoholysis reaction at a room temperature; incomplete alcoholysate generated by the reaction flows into the tower II and is subjected to the alcoholysis with vaporized methanol; and a crude finish product of methyltrimethoxysilane enters a crude finish product receiver. The process is stable and easy to operate, the product quality is high, the yield of the crude finish product of methyltrimethoxysilane is greater than 95%, the content is greater than 96%, and the acid content is less than 30ppm.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to an alcoholysis process of methyltrimethoxysilane. Background technique [0002] As a silicone crosslinking agent and coupling agent, methyltrimethoxysilane is generally used as the main raw material of silicone resin and the main auxiliary material of room temperature vulcanized silicone rubber. It is also widely used in other chemical fields to improve the mechanical strength of products. , heat resistance, moisture resistance. Methyltrimethoxysilane is obtained from the alcoholysis reaction of methyltrichlorosilane and methanol, and its main reaction is CH 3 SiCl 3 +3CH 3 Oh CH 3 Si(OCH 3 ) 3 +3HCl. The current production process is a single-pot operation, such as the patent disclosure of application number 200610014542.X, chlorosilane and alcohols are dropped into the mixed reactor at a molar ratio of 1:1 for alcoholysis reaction; there are also continuous methods of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/18
Inventor 李建兵贺志江谢云飞
Owner JIANGXI BLUESTAR XINGHUO SILICONE CO LTD
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