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Method for preparing methyl chlorosilane by utilizing organosilicon high-boiling residues

A technology of methylchlorosilane and dimethyldichlorosilane, which is applied in the field of organosilicon monomer production technology, can solve the problems of low conversion rate and achieve the effect of improving conversion rate and good selectivity

Inactive Publication Date: 2011-08-17
于淑芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can only crack methylchlorodisilane containing Si-Si bonds in high boilers, but cannot crack other components containing Si-O-Si and Si-C-Si in high boilers, resulting in The conversion rate is low when the whole component is used as raw material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 2500kg organosilicon high boiler and 50kg catalyst into the cracking kettle with packed fractionation tower. Heat up to 115°C with steam, and feed 25Nm 3 / h of hydrogen chloride gas (continuous), reaction under normal pressure. Start to react for 1 hour, continuously add high boiler 190kg / h in the cracking kettle, and simultaneously add catalyst 0.25kg / h, continuously react for 40 hours, and continuously collect condensed mixed monomers from the condenser. The conversion rate of its high boiling matter reaches 91.4%, and the main product consists of:

[0024] Monomethyldichlorosilane CH 3 HSiCl 20.87%

[0025] Monomethyltrichlorosilane CH 3 SiCl 3 16.06%

[0026] Dimethyldichlorosilane (CH 3 ) 2 SiCl 2 52.51%

[0027] Trimethylchlorosilane (CH 3 ) 3 SiCl 10.13%

Embodiment 2

[0029] Add 2500kg organosilicon high boilers and 62.5kg catalyst to the cracking kettle with packed fractionation tower. Heat up to 115°C with steam, and feed 25Nm 3 / h of hydrogen chloride gas (continuous), reaction under normal pressure. Start to react for 1.2 hours, continuously add high boiler 200kg / h in the cracking kettle, and add catalyst 0.3kg / h simultaneously, continuously react for 41 hours, and continuously collect condensed mixed monomers from the condenser. The conversion rate of its high boiling matter reaches 93.7%, and the main product consists of:

[0030] Monomethyldichlorosilane CH 3 HSiCl 19.02%

[0031] Monomethyltrichlorosilane CH 3 SiCl 3 12.70%

[0032] Dimethyldichlorosilane (CH 3 ) 2 SiCl 2 56.77%

[0033] Trimethylchlorosilane (CH 3 ) 3 SiCl 11.28%.

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Abstract

The invention relates to a method for preparing methyl chlorosilane by utilizing organosilicon high-boiling residues, which is realized in a way that: full components of high-boiling residues, which are the byproducts in the production process of organosilicon monomer dimethyl dichlorosilane, are used as the raw material, and react with chlorine hydride in a cracking kettle provided with a fractionating tower under the catalytic action of N,N-dimethylaniline and tri-n-butylamine to generate a monomer mixture mainly comprising dimethyl dichlorosilane, trimethyl monochlorosilane, monomethyl dichlorosilane and monomethyl trichlorosilane, and the monomer mixture is condensed and collected by a condenser on the top of the fractionating tower. The method can increase the conversion rate of high-boiling residues (greater than 90%), and produce organosilicon monomers at low cost; and the selectivity of the dimethyl dichlorosilane is up to higher than 50%, and the selectivity of the trimethyl monochlorosilane is up to 10%.

Description

technical field [0001] The invention relates to a production process of organosilicon monomers, in particular to a production process for preparing methylchlorosilane by catalytic cracking by using high boilers produced in the production of dimethyldichlorosilane as raw materials. Background technique [0002] Dimethyldichlorosilane is the basic raw material of silicone, used to produce silicone oil, silicone resin, silicone rubber, etc. These products have high and low temperature resistance, weather resistance, aging resistance, electrical insulation, ozone resistance, water repellency, flame retardant, physiological inertia And many other unique properties, which cannot be compared and replaced by other organic polymer materials, so they are widely used in various fields such as aerospace, electronics, light industry, chemical industry, textile, machinery, construction, transportation, medical and health, agriculture, etc. , has become an important and indispensable new p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/12
Inventor 于淑芳
Owner 于淑芳
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