Method for synthesizing high-boiling silicon oil by using organosilicon high-boiling product

Abstract

A method for synthesizing high-boiler silicon oil by organic silicon high-boiler substances belongs to the technical field of the production technology of high-boiler silicon oil, which mainly solves the problems of excessive use of carbamide, fluxing agent and ammonium hydrogen carbonate of the existing method and comprises the following steps: (1) injecting 700 weight parts of organic silicon high-boiler substances and 350-420 weight parts of methanol with the temperature of 115-128 DEG C into an alcoholysis reaction tower to undergo alcoholysis reaction to discharge chlorine hydride; (2) flowing the reactant into a depickling reaction kettle to depickle for 2-3 hours, and then injecting into a neutralizing reaction kettle; (3) repeating step (1) and step (2); (4) adding 15-16 parts of water, 200-220 parts of carbamide, 30-40 parts of zinc oxide and 100-140 parts of ammonium hydrogen carbonate by weight to the neutralizing reaction kettle to undergo neutralization reaction; (5) stratifying and filtering the neutralized reactant to obtain the high-boiler silicon oil product. The method is characterized by low production cost and high oil yield, which is mainly used for synthesizing high-boiler silicon oil by organic silicon high-boiler substances.

Description

technical field [0001] The invention belongs to the technical field of production technology of high boiling silicone oil. In particular, it relates to a method for synthesizing high-boiling silicone oil through organosilicon high-boiling substances. Background technique [0002] At present, many units at home and abroad have done a lot of work on the comprehensive utilization of high boiling substances. The methods used mainly include cracking, hydrolysis and alcoholysis. Instability and other problems: If monosilane is prepared by cracking method, the reaction conditions are harsh, the content of dimethyldichlorosilane in the product is low, and the high boiler needs to be distilled first, otherwise the solid residue in it will easily lead to catalyst poisoning; hydrolysis method There are deficiencies such as difficult product washing and unstable quality; the existing alcoholysis method has problems such as difficult control of molecular weight and difficult separation ...

AI Technical Summary

Problems solved by technology

[0002] At present, many units at home and abroad have done a lot of work on the comprehensive utilization of high boiling substances. The methods used mainly include cracking, hydrolysis and alcoholysis. Instability and other problems: If monosilane is prepared by cracking method, the reaction conditions are harsh, the content of dimethyldichlorosilane in the product is low, and the high boiler needs to be distilled first, otherwise the solid residue in it will easily lead to catalyst poisoning; hydrolysis method There are problems such as difficult product washing and unstable quality; the existing alcoholysis method has problems such as difficult control of molecular weight and difficult separation of target products

Although this patent solves the deficiencies of the existing cracking methods, hydrolysis methods and alcoholysis methods, since the alcoholysis reaction and neutralization reaction are all carried out in the same reactor, hydrogen chloride gas is not removed enough during the alcoholysis reaction, making the system There is more hydrogen chloride dissolved in the neutralization reaction process, so a large amount of urea, flux and ammonium bicarbonate are needed in the neutralization reaction process, and there are disadvantages that the production raw material cost is not low enough, and the oil yield is not high enough, and the oil yield is only 64%.