Method for preparing methyl silicic acid and industrial hydrochloric acid by using hydrolysis of methyl trichlorosilane

Abstract

The invention discloses a method for preparing methyl silicic acid and industrial hydrochloric acid by using hydrolysis of methyl trichlorosilane, which comprises the following steps of: adding 10 to 13 parts of 14 to 16 percent diluted hydrochloric acid into a reaction kettle, stirring the diluted hydrochloric acid, dripping 1 part of methyl trichlorosilane into the kettle to obtain solid methylsilicic acid and hydrochloric acid liquid, and separating the solid methyl silicic acid and the hydrochloric acid liquid; and dripping the methyl trichlorosilane into the hydrochloric acid for two times by adopting the same method, and controlling the reaction temperature during dripping. The methyl silicic acid prepared by the method has small granules, and the cleaned granules are not easy to contain acid; and because the ratio of the pre-added diluted hydrochloric acid to the methyl trichlorosilane is high, the reaction temperature can be controlled to be low, the production efficiency is greatly improved, the hydrochloric acid byproduct is changed into the industrial hydrochloric acid with high concentration, the emission is greatly reduced, extremely low emission can fully meet the national related standards, the environment is improved, and the social benefit and the economic benefit are very high.

Description

technical field [0001] The invention relates to a method for preparing methyl silicic acid and industrial hydrochloric acid by hydrolyzing methyl trichlorosilane. technical background [0002] Methyltrichlorosilane is one of several main monomers produced by organosilicon monomer manufacturers in the production of monomers, accounting for about 12% of the total amount of monomers in production. The current domestic output of methyltrichlorosilane About 80,000-100,000 tons. Since the rear products that can be prepared by methyltrichlorosilane in China are still very old product series, such as silicone resin, silane coupling agent, methyl silicic acid, etc., the market demand for these products is not large. The most widely used in China is methyl silicic acid. Various reasons lead to a severe oversupply of methyltrichlorosilane, and it is a dangerous chemical that is not easy to store, so that methyltrisilane has become an organosilicon monomer manufacturer to produce dime...

AI Technical Summary

Problems solved by technology

In fact, the easiest way to deal with methyltrichlorosilane is to prepare methylsilicic acid by hydrolysis, but the current domestic traditional process is too simple, because a large amount of methyltrichlorosilane is produced in the process--3-4 per ton of methyltrichlorosilane Dilute hydrochloric acid with a concentration of about 18% per ton not only has a great impact on the environment, but also creates a problem of how to deal with dilute hydrochloric acid