Preparation method for trimethylethoxysilane

Abstract

The invention discloses a preparation method for trimethylethoxysilane, which comprises the following steps: (1) adding trimethyl chlorosilane into a reaction kettle, and then adding an absorbent capable of absorbing chlorine hydride by stirring, wherein the addition of the absorbent is 20 to 70 percent of the weight of the trimethyl chlorosilane; (2) dripping ethanol in the stirring process, controlling the dripping speed to enable the reaction temperature to less than or equal to 80 DEG C, and continuously stirring the mixture for 1 to 4 hours, wherein in the reaction, the addition of the ethanol is 1.10 to 1.20 times of the theoretically calculated molar mass; (3) after the reaction is completed, stopping stirring, standing the mixture for 5 to 30 minutes, performing natural layering on the product, and performing layering and separation to obtain a crude product of the trimethylethoxysilane in the upper layer. The method adopts the absorbent capable of absorbing the chlorine hydride, so that the reaction is performed smoothly under the condition of normal temperature, and the reaction is simplified and saves energy. The process is simplified, has high product yield, and reduces the extraction of a large amount of salt and volatilization loss so as to reduce the production cost greatly.

Description

technical field [0001] The invention relates to the preparation of a raw material for synthesizing organosilicon compounds, in particular to a preparation method of trimethylethoxysilane. Background technique [0002] Silicone products are a relatively late-developing industry, which developed internationally in the middle and late 20th century, while my country only began to develop at the end of the 20th century. Trimethylethoxysilane is insoluble in water but miscible in most organic solvents. It is mainly used in the synthesis of organosilicon compounds and also as a hydrophobic agent. Reports and patented technologies for the production technology of trimethylethoxysilane are hardly disclosed at present. [0003] In the previous production of alkoxysilane products, the cyclic lipidation method, that is, the cyclic reaction method, was mostly used. For dimethyldichlorosilane, which is easy to prepare, its preparation process can be completed at about 100°C, but there a...

AI Technical Summary

Problems solved by technology

For dimethyldichlorosilane, which is easy to prepare, its preparation process can also be completed at about 100 ° C, but there are problems of long process flow (needing processes such as neutralization and filtration) and low yield

Under normal conditions, it is difficult to prepare trimethylchlorosilane in this way

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