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Method and system for preparing tetramethyldihydrodisiloxane by hydrolyzing organic silicon low-boiling-point substance and comprehensive utilization method

A technology of tetramethyldihydrodisiloxane and dimethylmonochlorosilane, which is applied in the fields of silicon organic compounds, preparation with chloride, organic chemistry, etc., can solve the problems of unstable downstream manufacturers, cumbersome residue treatment, and energy consumption Consumption and other issues, to achieve the effect of easy promotion, low cost, and reduced processing costs

Active Publication Date: 2020-11-10
LUXI CHEM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, many domestic manufacturers have built a disproportionation device, but the treatment of the disproportionated residue containing aluminum trichloride is cumbersome. Aluminum trichloride will react violently when it meets water, often accompanied by combustion. At the same time, the trichloride in the low boiling Hydrogen silicon does not react, so trichlorosilane will always circulate in the system, consumes a lot of energy, and accumulates in the device, eventually making it impossible to drive. At the same time, the silicon tetrachloride contained in the azeotrope does not react in the disproportionation device , so silicon tetrachloride will always circulate in the system and accumulate in the device
At present, low-boiling substances are mainly sold outside at a premium, and downstream manufacturers are unstable due to environmental protection control

Method used

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  • Method and system for preparing tetramethyldihydrodisiloxane by hydrolyzing organic silicon low-boiling-point substance and comprehensive utilization method

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Embodiment 1

[0047] Such as figure 1 The process flow shown, a method for preparing tetramethyldihydrodisiloxane by hydrolysis of low-boiling organic silicon, includes the following steps:

[0048] (1) The rectified low-boiling matter is first sent to Sijia Tower 1 through the low-boiling feed pump, and Sijia Tower 1 starts to rise when the liquid level of Sijia Tower 1 reaches 50% to 70% of the bottom of the tower, and a total reflux operation is established. By adjusting the control parameters of Sijia Tower 1: Operating pressure: 0.25Mpa, return flow 4m 3 / hr, the top temperature of the tower is about 42℃, and the temperature of the tower bottom is about 68℃. Take reflux and tower bottom sample analysis, the content of tetramethylsilane in the reflux sample is controlled at about 90%, dimethylmonochlorosilane is less than 0.1%, and the content of tetramethylsilane in the tower bottom is less than 0.5%. For feeding, tetramethylsilane is taken from the top of the tower into the tetramethyls...

Embodiment 2

[0057] (1) The rectified low-boiling matter is first sent to Sijia Tower 1 through the low-boiling feed pump, and Sijia Tower 1 starts to rise when the liquid level of Sijia Tower 1 reaches 50% to 70% of the bottom of the tower, and a total reflux operation is established. By adjusting the control parameters of Sijia Tower 1: Operating pressure: 0.25Mpa, return flow 4m 3 / hr, the top temperature of the tower is about 42℃, and the temperature of the tower bottom is about 68℃. Take reflux and tower bottom sample analysis, the content of tetramethylsilane in the reflux sample is controlled at about 90%, dimethylmonochlorosilane is less than 0.1%, and the content of tetramethylsilane in the tower bottom is less than 0.5%. For feeding, tetramethylsilane is taken from the top of the tower into the tetramethylsilane metering tank, and the bottom of the tower is sent to the dimethylmonochlorosilane tower 2 through the dimethylmonochlorosilane feed pump, the dimethylmonochlorosilane towe...

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Abstract

The invention discloses a method and a system for preparing tetramethyldihydrodisiloxane by hydrolyzing an organosilicon low-boiling-point substance and a comprehensive utilization method, and belongsto the field of organosilicon production. The method comprises the following steps: separating and purifying dimethyl monochlorosilane from a low-boiling-point substance, hydrolyzing the dimethyl monochlorosilane with higher content in a loop by using a hydrolysis process, and fully mixing reactants in the hydrolysis loop through a static mixer; wherein the temperature of process water is controlled to be about 10 DEG C through a cooler, and the hydrolysis temperature is controlled to be about 10 DEG C through a circulating cooler; then feeding the reaction mixture to a first layering devicethrough the top of a loop to achieve effective oil-water separation, and feeding hydrolysate (double seal heads) obtained through separation into a hydrolysate intermediate tank to be further settledand dewatered; and performing multi-stage washing and rectification on the crude hydrogen-containing double-end socket to obtain a qualified high-purity hydrogen-containing double-end socket product and 20% hydrochloric acid as a byproduct.

Description

Technical field: [0001] The invention relates to a method, a system and a comprehensive utilization method for preparing tetramethyldihydrodisiloxane by hydrolysis of organic silicon low-boiling substances, and belongs to the field of organic silicon production. [0002] technical background: [0003] At present, the direct synthesis method is mainly used to produce organosilicon monomers in China. The synthesized organosilicon monomers enter the distillation system to separate and extract dimethyldichlorosilane. Among them, a large number of mixed components with a boiling point below 40℃ are separated. The mixed components are defined as low boilers. The main component of low boilers is very useful Me 4 Si and Me 2 SiHCl, but it is difficult to separate due to the close boiling points of the components, and it is difficult to use. In addition, it can be directly hydrolyzed and alcoholyzed to prepare branched silicone oil. Foreign countries use low-boiling matter to produce gas p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/08C01B7/03
CPCC07F7/0896C01B7/03Y02P20/10
Inventor 王长明和徳杰何龙王祖刚
Owner LUXI CHEM GRP
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