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Method for generating dimethyldichlorosilance by utilizing disproportionation reaction

A technology of dimethyldichlorosilane and monomethyltrichlorosilane, which is applied in the field of comprehensive utilization of three wastes, can solve the problems of low comprehensive utilization rate of by-products and high energy consumption, and achieves simple and easy operation, low cost and reasonable design. Effect

Active Publication Date: 2010-09-08
HANGZHOU JINFADA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: the introduction of methadone leads to relatively high energy consumption, and there is no utilization of other by-product monomers
The disadvantage of this method is that the comprehensive utilization rate of by-products is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This disproportionation reaction should adopt the kettle-type batch operation method. The kettle can be a single unit or multiple units. It is determined according to the effective volume and production scale of the single unit of the stirred tank. The stirring speed should be controlled by frequency conversion.

[0022] Put 10kg of monomethyltrichlorosilane, 5kg of trimethylmonochlorosilane and 0.015kg of catalyst aluminum powder into the high-pressure stirred tank, control the loading coefficient of the stirred tank to not more than 75%, seal all the interfaces on the stirred tank, start the stirring, and stir The speed is controlled at 100r / min, and then the temperature is slowly raised with heat transfer oil to raise the temperature to 180°C, after 1 hour of constant temperature, stop heating, cool to normal temperature, use the residual pressure in the kettle or nitrogen to press the reacted materials out of the stirred kettle After the material is filtered, it enters ...

Embodiment 2

[0025] Put 10kg of monomethyltrichlorosilane, 10kg of trimethylmonochlorosilane and 1kg of catalyst anhydrous aluminum trichloride into the high-pressure stirred tank, control the loading coefficient of the stirred tank to not more than 75%, seal all the interfaces on the stirred tank, and start Stir, the stirring speed is controlled at 200r / min, and then slowly heat up with heat transfer oil to raise the temperature to 250℃. After 3 hours of constant temperature, stop heating and cool to normal temperature. Use the residual pressure in the kettle or nitrogen to pressure the reacted materials Out of the stirred tank, the material is filtered and then enters the organosilicon monomer separation system for separation to obtain 15.76kg of dimethyldichlorosilane, the conversion rate is 78.80%, and the separated high boilers, low boilers and trimethylmonochlorosilane are separated , Monomethyltrichlorosilane continues to be recycled as a principle.

Embodiment 3

[0027] Put 10kg of monomethyltrichlorosilane, 8kg of trimethylchlorosilane and 0.36kg of aluminum powder and anhydrous aluminum trichloride combined catalyst into the high-pressure stirred tank, control the filling coefficient of the stirred tank to not more than 75%, and seal the stirred tank Connect all interfaces, start stirring, control the stirring speed at 300r / min, then slowly raise the temperature with heat transfer oil to raise the temperature to 350℃, after 4 hours of constant temperature, stop heating, cool to normal temperature, use the residual pressure in the kettle or nitrogen The reacted materials are pressed out of the stirred tank, and the materials are filtered and then enter the organosilicon monomer separation system for separation. 11.67kg of dimethyldichlorosilane is obtained, and the conversion rate is 64.83%. The separated high boiling, low boiling and three Methylmonochlorosilane and monomethyltrichlorosilane continue to be recycled as the principle.

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Abstract

The invention relates to a method for generating dimethyldichlorosilance by utilizing disproportionation reaction, which belongs to the technical field of the comprehensive utilization of three wastes in the production process of methyl chlorosilane. The invention is characterized by comprising the following steps: generating the dimethyldichlorosilance by using methyl trichlorosilane and trimethylchlorosilane as organic silicon monomers, or a high boiling object and a low boiling object as the organic silicon monomers, or the mixture of the methyl trichlorosilane, the trimethylchlorosilane, the high boiling object and the low boiling object as the organic silicon monomers as raw materials under the single or combined catalytic action of aluminum powder and anhydrous aluminum trichloride as catalysts. In the invention, reaction is generated in a high-pressure agitating kettle at the temperature of 180 to 350 DEG C, and in the reaction, the reaction pressure is controlled by the reaction temperature, i.e. the higher the reaction temperature is, the higher the reaction pressure is, and the maximum conversion rate of a target product can reach more than 70 percent. The invention improves the resource utilization level of methyl organic silicon monomer production, the dimethyldichlorosilance is produced in lower cost, and the invention has simple and easy operation and is suitable for large-scale popularization and utilization.

Description

Technical field [0001] The invention belongs to the technical field of comprehensive utilization of three wastes in the production process of methylchlorosilane, and specifically relates to the conversion of monomethyltrichlorosilane, trimethylmonochlorosilane, high boiling substances and low boiling substances into dimethyldichlorosilane Methods. Background technique [0002] In the process of direct synthesis of methylchlorosilane, in addition to the target product dimethyldichlorosilane (hereinafter referred to as dimethyl), there are also some by-products, including methyltrichlorosilane (abbreviated as one), trimethylchlorosilane (Abbreviated as trimethyl) and methyldichlorosilane (abbreviated as monomethyl containing hydrogen), high boiling point mixture (abbreviated as high boiler) and low boiling point mixture (abbreviated as low boiler), etc. The above-mentioned by-products are of little use value except for the trimethyl and monomethyl containing hydrogen which have ce...

Claims

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Application Information

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IPC IPC(8): C07F7/12
Inventor 孔鑫明周海杨刘劭农周锦枫邓青松程晨杰汤晓娟江钧钧张俊杰
Owner HANGZHOU JINFADA CHEM IND
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