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Treatment method of organic silicon low-boiling-point substance

A processing method and technology of low boilers, applied in the directions of silicon organic compounds, preparation with chlorides, chlorine/hydrogen chloride, etc., can solve problems such as immaturity, and achieve the effect of high market value

Inactive Publication Date: 2014-01-29
LUZHOU NORTH CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Foreign countries also produce fumed silica by burning organic silicon low boilers, but this technology is not yet mature in China

Method used

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  • Treatment method of organic silicon low-boiling-point substance
  • Treatment method of organic silicon low-boiling-point substance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The organic absorption solvent is alcohol, the concentration of concentrated hydrochloric acid is 35%, the condensation temperature of the tetramethylsilane condensation absorption device is -10°C, the reaction kettle is a ceramic stirring tank, the aspect ratio of the packing column is 10:1, and the outside of the packing column is equipped with Heat exchange device, when concentrated hydrochloric acid is added dropwise, water at room temperature is passed into the heat exchange device for heat exchange.

[0033] Add 500 volumes of organic silicon low boilers into the reaction kettle, and add 200 volumes of concentrated hydrochloric acid dropwise from the middle of the packing column while stirring. After 0.5 hours, the temperature in the kettle dropped to -10°C. After feeding for 1.5 hours, the temperature in the kettle rose to 0°C. At this time, 120 volumes of concentrated hydrochloric acid had been added, so the feeding speed was increased, and the remaining 80 volum...

Embodiment 2

[0035] The organic absorption solvent is waste engine oil, the concentration of concentrated hydrochloric acid is 35%, the condensation temperature of the tetramethylsilane condensation absorption device is -10°C, the reaction kettle is a ceramic stirring tank, the length-to-diameter ratio of the packing column is 10:1, and the outside of the packing column is set There is a heat exchange device. When concentrated hydrochloric acid is added dropwise, room temperature water is passed into the heat exchange device for heat exchange.

[0036] Add 500 volumes of organic silicon low boilers into the reaction kettle, and add 300 volumes of concentrated hydrochloric acid from the middle of the packing column while stirring. After 0.5 hours, the temperature in the kettle dropped to -10°C. After feeding for 1.5 hours, the temperature in the kettle became normal temperature. At this time, 200 volumes of concentrated hydrochloric acid had been added, so the feeding speed was accelerated, ...

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Abstract

The invention discloses a treatment method of an organic silicon low-boiling-point substance and particularly relates to a method of treating an organic silicon low-boiling-point substance by utilizing reverse dropwise adding of concentrated hydrochloric acid. The method comprises the following steps: a, adding the organic silicon low-boiling-point substance into a reaction kettle with a filled column and stirring, and then, dropwise adding concentrated hydrochloric acid from the middle part of the filled column while stirring to carry out reaction; 1.5-1 hour after dropwise adding the concentrated hydrochloric acid, heating a reaction system to 40 DEG C-50 DEG C to continuously react for 1-2 hours; b, ventilating tail gas generated by reaction into a hydrochloric acid absorbing device, an organic absorbing device and a tetramethylsilane condensing and recycling device in sequence; c, after the reaction in the step a is finished, standing for a certain time, and discharging the hydrochloric acid from the reaction kettle; and d, heating the reaction kettle, keeping the temperature in the kettle at 60 DEG C-70 DEG C for carrying out distillation to obtain tetramethylsilane. According to the treatment method disclosed by the invention, three products of the tetramethylsilane, the hydrochloric acid and hydrolysate can be obtained, so that a novel method is provided for treating the organic silicon low-boiling-point substance.

Description

technical field [0001] The invention relates to a method for treating low-boiling organic silicon, in particular to a method for treating low-boiling organic silicon by back-dropping concentrated hydrochloric acid. Background technique [0002] The main product of the direct synthesis of organosilicon monomers is dimethyldichlorosilane, and a large number of by-products will be produced at the same time. The separated mixed components with a boiling point lower than 40°C are defined as low boilers. The main components of organosilicon low boilers are tetramethylsilane, dimethylhydrogen (ie, dimethylmonochlorosilane), monomethylhydrogen (ie, monomethyldichlorosilane) and methyl chloride. Organosilicon low boiler is a mixture containing chlorosilane, with a low boiling point, easy to volatilize and difficult to transport; and because of its large molecular weight, it is easy to form a steam mass, which will burn or explode when it encounters an open flame, and produces a large...

Claims

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Application Information

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IPC IPC(8): C07F7/08C01B7/03
Inventor 张文博杨文俊唐纹涛李争鸣唐荣娟张莹徐志远
Owner LUZHOU NORTH CHEM IND
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