Method for compositing trialkoxysilanes by adopting multistage fluidized bed

Abstract

A method for compositing trialkoxysilanesby adopting a multistage fluidized bed relates to a composite method of trialkoxysilanesby. The composite method solves the problems that in the existing composite technology of trialkoxysilanesby, catalytic agent is difficult to be recycled, reactive efficiency is low, products are difficult to be separated, silica powder and copper-based catalytic agent have poor contact, copper silicon contacts have slow productivity and low reactive activity, the catalytic agent loses effectiveness easily after meeting water, and the products are easily hydrolyzed after meeting water. The composite method of trialkoxysilanesby comprises the following steps: 1. preparing copper silicon contacts containing different cuprous chloride mass percents; 2. charging copper silicon contacts obtained in the step one to a reactor of the multistage fluidized bed in stages; and 3. introducing alcohol gas dried by ethyl orthosilicate into the reactor of the multistage fluidized bed to obtain trialkoxysilanesby after reaction and composition. By adopting the method for compositing trialkoxysilanes by adopting the multistage fluidized bed, the selectivity of trialkoxysilanesby reaches 95% and reactive transformation ratio reaches 95%.

Description

Technical field [0001] The invention relates to a method for synthesizing trialkoxysilane. Background technique [0002] At present, the synthesis method of trialkoxysilane mainly adopts the direct method. In the direct method, a kettle-type slurry reactor is mostly used. The reaction process requires a solvent as a suspending agent. The problems that this brings are: ① Increase the operating cost of the reaction. ② It is difficult to recover the catalyst and the remaining silicon powder after the reaction. ③ It hinders the direct contact between the silicon powder and the alcohol vapor. ④ It is not conducive to product separation and purification. Moreover, during the reaction process, a silicon dioxide film is formed due to the oxidation of the silicon powder surface, resulting in poor contact between the silicon powder and the copper-based catalyst, low silicon-copper contacts, low reactivity, and the presence of trace water in the reaction system. Catalyst failure, product h...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of difficulty in catalyst recovery, low reaction efficiency, difficult separation of products, poor contact between silicon powder and copper catalysts, low productivity of silicon-copper contacts and low reactivity in the existing synthesis process of trialkoxysilane. The problem of easy failure in contact with water and easy hydrolysis of products in contact with water, the present invention provides a method for synthesizing trialkoxysilane using a multi-stage fluidized bed

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