Technology for preparing methyl hydrogen silicone oil

Abstract

The invention discloses a technology for preparing methyl hydrogen silicone oil.The methyl hydrogen silicone oil is prepared through saturated acid hydrolysis, secondary hydrolysis, telomerization reaction, devolatiligation reaction and decoloring reaction.According to the technology for preparing methyl hydrogen silicone oil, frozen saline water is not needed for cooling in the hydrolysis process, energy consumption is greatly reduced, production cost is reduced, HCl generated through the hydrolysis reaction overflows in a gas state mode, the concentration of prepared hydrochloric acid can be increased to be 31% or above, the standard of industrial hydrochloric acid of the state is achieved, selling is facilitated, and by means of the method, continuous production can be achieved, the productivity is high, and the middle process can be controlled easily.

Description

technical field [0001] The invention relates to a process for preparing methyl hydrogen-containing silicone oil, in particular to a production process for continuously producing methyl hydrogen-containing silicone oil by using a saturated acid hydrolysis method. technical background [0002] The traditional production process of methyl hydrogen-containing silicone oil mainly includes solvent hydrolysis and azeotropic acid hydrolysis process. The solvent hydrolysis process is intermittent operation. Most of them use 120# gasoline as the solvent and excess water to mix and stir the methyl hydrogen dichlorosilane The mixture with trimethylchlorosilane is added dropwise into water with solvent gasoline for hydrolysis reaction. This reaction is a batch reaction, solvent gasoline is difficult to recover, and the water consumption is large. A large amount of heat released by the reaction needs to be transferred out with a refrigerant, and the production energy consumption is high. ...

AI Technical Summary

Problems solved by technology

[0002] The traditional production process of methyl hydrogen-containing silicone oil mainly includes solvent hydrolysis and azeotropic acid hydrolysis process. The solvent hydrolysis process is intermittent operation. Most of them use 120# gasoline as the solvent and excess water to mix and stir the methyl hydrogen dichlorosilane The mixture with trimethylchlorosilane is added dropwise to water with solvent gasoline for hydrolysis reaction. This reaction is a batch reaction, solvent gasoline is difficult to recover, and the water consumption is large. The large amount of heat released by the reaction needs to be transferred out with refrigerant, and the production energy consumption is high.

[0003] The azeotropic acid hydrolysis process is a continuous production process, which is a solvent-free method, a production process patent for continuous production of high hydrogen-containing silicone oil (CN103788377A), using dilute hydrochloric acid, methylhydrogen dichlorosilane and trimethylchlorosilane The mixture is reacted, the HCl produced in the reaction is dissolved in dilute hydrochloric acid, and a large amount of heat is released, so a heat exchanger is required for heat exchange, which consumes a lot of energy, and the concentration of hydrochloric acid produced after the reaction is low, which cannot reach the standard concentration of industrial hydrochloric acid. The requirement of greater than 31% (GB320-2006 industrial synthetic hydrochloric acid), is not conducive to sales