Serialization production method for direct synthesizing alkoxy silane by chlorine-free process

Abstract

The invention discloses a continual manufacturing method of tetraalkoxy silicane, which comprises the following steps: blending alkaline catalyst and solvent in the autoclave with weight rate at 1:5-5:1; heating to 130-210 deg.c to activate 2-5h; adding alcohol and 20-80% silicon powder with molar rate at 3:1-1:3 under 150-220 deg.c; transmitting composition into separating tower; draining hydrogen from top of tower; separating tetraalkoxy silicane and low-boiling point component in the separating tower; returning alcohol to autoclave.

Description

technical field The invention relates to a method for continuously producing chlorine-free tetraalkoxysilane, in particular to a continuous production method for directly synthesizing tetraalkoxysilane without chlorine. Background technique Currently known methods for continuous production of tetraalkoxysilane mainly include two types in industry, one is the direct reaction of silicon powder and ethanol, and the other is the esterification reaction of tetrachlorosilane and ethanol. The latter method is that the esterification reaction of tetrachlorosilane can be carried out under normal pressure without adding energy to the simple and easy reactor, and the resulting esterification mixture is distilled to obtain the target product. However, a large amount of hydrogen chloride is produced in the reaction. The corrosion is quite serious, and the environment is polluted at the same time. The tetraalkoxysilane product produced contains chlorine, and the removal of chlorine-contai...

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Problems solved by technology

The copper catalyst described in US5084590 directly synthesizes alkoxysilane, however, the main product of this reaction is trialkoxysilane, and the tetraalkoxysilane directly synthesized here is relatively small, and there is no way to optimize the reaction here to avoid Si- Formation of H bonds and production of trialkoxysilanes, in short, the production of tetraalkoxysilanes is not ideal, and copper-containing catalysts require expensive processes, copper catalysts are not suitable for the production of economical and efficient tetraalkoxysilanes

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