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Process for preparing alkoxychlorosilane

A technology of alkoxychlorosilane and chlorosilane, which is applied in the field of compound preparation, can solve the problems of high price, many reaction steps, and low yield of dimethoxydichlorosilane, and achieve low price, few reaction steps, The effect of high reaction yield

Inactive Publication Date: 2004-11-17
张宏
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Problems solved by technology

The disadvantage of this method is that the yield is low, generally 30-40%; the cost is high, and the price of the main raw material dimethoxydichlorosilane is high; there are many reaction steps, which need to be completed in two

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0007] Embodiment 1: Add 1660 grams of methyltrichlorosilane in the feed tank A of the tower reactor, add 620 grams of methyl alcohol in another feed tank B, the feed tank A and the feed tank B are located in the middle of the tower reactor, heated When the temperature of the tower kettle of the reactor rises to 70-80°C, feed is fed from feed tank A and feed tank B at the same time, and a large amount of hydrogen chloride tail gas begins to escape from the top of the tower. Control the feeding speed so that the two materials are added simultaneously. The total reflux was maintained for another 5 hours, and at this time, no hydrogen chloride gas escaped from the top of the tower. Sampling analysis in the tower still showed that the content of methyl chlorodimethoxysilane was 92.6%, and the cooled still liquid was rectified with a rectifying tower to obtain 960.5 grams of a product with a purity of 98%, and its yield was 61.5%.

Embodiment 2

[0008] Embodiment 2: Add 1310 grams of dimethyl dichlorosilane in the feed tank A of the tower reactor, add 320 grams of methanol in another feed tank B, the feed tank A and the feed tank B are located in the middle of the tower reactor, Heating the tower kettle of the reactor, when the temperature rises to 60-70°C, feed from feeding tank A and feeding tank B at the same time, a large amount of hydrogen chloride tail gas begins to escape from the top of the tower, control the feeding speed, so that the two materials are added at the same time . Total reflux was maintained for another 6 hours, at which time no hydrogen chloride escaped from the top of the tower. Sampling analysis in the tower still showed that the content of dimethyl-chloromethoxysilane was 82.6%, and the cooled still liquid was rectified with a rectification tower to obtain 840 grams of a product with a purity of 97.5%, and its yield was 70%.

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Abstract

A process for preparing alkoxychlorosilane features that the chlorosilane (RnSiCl4-n, where R=alkyl and n=0-2) and alcohol (R''OH) in mole ratio of (1-4):1 take part in reaction at 40-80 deg.C for 4-8 hr to obtain the product. Its advantages are low cost, high output rate and purity, no discharge of three wastes, and no environmental pollution.

Description

technical field [0001] The invention relates to a method for preparing a compound, in particular to a method for preparing an alkoxychlorosilane. Background technique [0002] The current method for preparing alkoxychlorosilane is the Grignard method. For example, the preparation method of methyl-chlorodimethoxysilane is carried out in two steps. One is to prepare the Grignard reagent, using methyl chloride CH 3 Cl reacts with magnesium Mg to generate Grignard reagent MgCH 3 Cl, the second is the reaction of dimethoxydichlorosilane with Grignard reagent under the catalysis of iodine to prepare methyl-chlorodimethoxysilane. The disadvantages of this method are that the yield is low, generally 30-40%; the cost is high, and the price of the main raw material dimethoxydichlorosilane is high; there are many reaction steps, which need to be completed in two steps. Contents of the invention [0003] The object of the present invention is to provide a kind of alkoxychlorosilane ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F7/18
Inventor 张宏
Owner 张宏
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