Preparation technique of methyl trimethoxysilane

A technology of methyltrimethoxysilane and methyltrichlorosilane is applied in the field of preparation technology of methyltrimethoxysilane, and can solve the problem that methyltrimethoxysilane is difficult to realize continuous production, the reaction process is difficult to control, and the efficiency is low. problems, to achieve the effect of DCS computer control, high effective content of products, and few operators

Active Publication Date: 2009-01-21
湖北新蓝天新材料股份有限公司
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Problems solved by technology

[0003] The purpose of the present invention is to provide a preparation process of methyltrimethoxysilane, so as to solve the technical problems that the existing method for preparing methyltrimethoxysilane is difficult to realize continuous production, the output is small, the efficiency is low, and the reaction process is not easy to control.

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  • Preparation technique of methyl trimethoxysilane
  • Preparation technique of methyl trimethoxysilane

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[0016] The technical solutions of the present invention will be further specifically described below through examples.

[0017] The preparation of methyltrimethoxysilane: adopt measuring pump to measure methyltrichlorosilane and methanol respectively, the mass ratio of described methyltrichlorosilane and methanol is 1.5: 1, methanol enters vaporization tank, and the temperature of vaporization tank is controlled at Any value between 70-80°C, because methanol only has a boiling point of 64.7°C, after being vaporized rapidly, it passes through another device from bottom to top—a stripper, and the temperature inside the stripper is 90°C. Then methanol gas enters the bottom of the reaction tower, and methyltrichlorosilane enters and sprays down from the top of the reaction tower. The two react through countercurrent contact. The main product produced during the reaction falls to the bottom of the reactor, and the by-product HCl gas Overflow from the gas overflow hole at the top of...

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Abstract

The invention provides a process for preparing methyltrimethoxy silane. The process comprises the following steps that: a. methanol is subjected to vaporization by a vaporizing cylinder and passes through a stripping tower, and enters the bottom part of a reaction tower, methyl trichlorosilane enters the reaction tower from the top and is sprayed downward, and methanol reacts with methyl trichlorosilane by counter current contact; b. a primary product is pumped in the top part of the stripping tower and subjected to steam stripping by methanol gases passing by the stripping tower, after falling onto the bottom part of the stripping tower, the primary product is pumped in a neutralization kettle, and the saturated sodium methylate solution is added in the neutralization kettle for neutralization; c. the coarse product of methyltrimethoxy silane is pumped in a rectification tower for rectification. The process has the characteristics of high working efficiency, stable process and big output, etc. Because the process of the invention is continuously carried out, the process has the advantages of having few operators, ensuring safe production and being capable of easily realizing the control of DCS computers; moreover, the product yield is 90 percent, the effective content of the product is high, and the content of methyltrimethoxy silane is more than 99 percent.

Description

technical field [0001] The invention relates to a preparation method of organic silicon, in particular to a preparation process of methyltrimethoxysilane. Background technique [0002] Methyltrimethoxysilane is mainly used as a crosslinking agent for room temperature vulcanized silicone rubber and a coupling agent for glass fibers, and it can also be used as a treatment agent for reinforced plastic laminates to improve the mechanical strength, heat resistance, Moisture resistance. Methyltrimethoxysilane is obtained by the esterification reaction of methyltrichlorosilane and methanol, and its reaction equation is: CH 3 SiCl 3 +3CH 3 OH→CH 3 Si(OCH 3 ) 3 +3HCl↑. Because the reaction speed of methyltrichlorosilane and methanol is relatively fast, the one-way or two-way dropping process is mostly used at present, and the reaction is carried out in a single tank. During the reaction, compressed air or nitrogen is used to remove harmful substances to the reaction. HCl gas....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/18
Inventor 肖俊平赵家旭
Owner 湖北新蓝天新材料股份有限公司
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