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Process of preparing dimethyl dichloro silicane by organosilicon high and low boiling matter

A technology of dimethyldichlorosilane and low boilers, which is applied in the field of preparing dimethyldichlorosilane through solid-phase catalytic cracking and disproportionation reactions, can solve the problems of undetermined technical parameters, cracking rate of high boilers, total monomer Yield The yield is not very high, and achieve the effects of outstanding technical indicators, easy continuous production, and undemanding requirements

Inactive Publication Date: 2007-07-18
NANCHANG UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

This method effectively prepares dimethyldichlorosilane from the organic silicon high-boiler and low-boiler components after filtering to remove the solid residue, but its related technical parameters are not determined, and the cracking rate of its high-boiler , total monomer yield, M 2 The yield is not very high

Method used

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  • Process of preparing dimethyl dichloro silicane by organosilicon high and low boiling matter

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The mixed raw material composed of high boiling matter and low boiling matter in a volume ratio of 1.3: 1 is mixed with hydrogen chloride at a speed of 20g / h and then added to the tower reactor. The molar ratio of the mixed raw material to hydrogen chloride is 1: 1.1, and the reaction Activated carbon and γ-Al in kettle 2 o 3 The ratio of the catalyst is 1:1, the total amount of the catalyst is 2.0% of the total amount of the mixed raw materials, the reaction temperature is 360°C, the temperature of the rectifying tower is 360°C, the temperature of the stripping tower is 75°C, it is operated under normal pressure, and the reaction is 25h. m 2 The content is 52%, the cracking rate of high boilers is 90%, and the total monomer yield is 88%.

Embodiment 2

[0019] High boilers and low boilers are mixed with hydrogen chloride at a speed of 30g / h and then added to the tower still type cracking reactor with a volume ratio of 1.2: 1. The mixed raw material and methyl chloride molar ratio is 2: 1. Activated carbon and γ-Al in kettle 2 o 3 The ratio of the catalyst is 1: 1.1, the total amount of catalyst is 5.0% of the total amount of mixed raw materials, the reaction temperature is 350°C, the rectification tower temperature is 370°C, the stripping tower temperature is 72°C, operated under normal pressure, reacted for 25h, and in the product m 2 The content of the compound is 48%, the cracking rate of high boilers is 88.6%, and the total monomer yield reaches 85%.

Embodiment 3

[0021] The mixed raw material composed of high boilers and low boilers in a volume ratio of 1.5:1 is mixed with hydrogen chloride at a speed of 40g / h and then added to the tower reactor. The molar ratio of mixed raw materials to hydrogen chloride is 1:1. Activated Carbon and γ-Al 2 o 3 The ratio of the catalyst is 1:0.9, the total amount of catalyst is 10% of the total amount of mixed raw materials, the reaction temperature is 300°C, the rectification tower temperature is 320°C, the stripping tower temperature is 79°C, operated under normal pressure, reacted for 25h, and in the product m 2 The content is 45%, the cracking rate of high boilers is 85%, and the total monomer yield is 80%.

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Abstract

The process of preparing dimethyl dichloro silane with organosilicon high and low boiler includes a two-section catalytic reaction of the mixture of organosilicon high boiler and organosilicon low boiler and preheated hydrogen chloride or chloromethane cracking gas with active carbon and gamma-Al2O3 as catalyst at the reaction pressure not higher than 0.2MPa and temperature of 200-400 deg.c, rectification, stripping and condensation to collect product. The present invention features the weight ratio between the catalyst and the mixture material of 1-10 %, the volume ratio between organosilicon high boiler and organosilicon low boiler of 1.2-1.5 to 1, and the molar ratio between the mixture and the hydrogen chloride or chloromethane cracking gas of 1 / 1.5-2, high boiler cracking rate higher than 85 %, total yield as high as 80 %, and M2 selectivity higher than 40 %.

Description

technical field [0001] The invention relates to a method for preparing silane by using organosilicon high boilers and low boilers, in particular a method for preparing dimethyldichlorosilane through solid-phase catalytic cracking disproportionation reaction. Background technique [0002] At present, domestic high boiling substances are mainly used in the production of silicone waterproofing agents and defoamers. The market capacity is limited, and only about one-fifth of high boiling substances can be used every year. Serious environmental protection problems and safety hazards lead to a large waste of effective resources. At present, there is no mature industrial technology in China to effectively use organic silicon high boiling substances. The utilization of high boiling substances has become a serious problem restricting the development of my country's organic silicon industry. obstacles, while the utilization of low boilers is relatively small. Therefore, the development...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/16C07F7/12
Inventor 张宁熊艳锋赵建波
Owner NANCHANG UNIV
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