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Method for preparing methylchlorosilane with high boiling organosilicon

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

Inactive Publication Date: 2008-12-03
SHANDONG DONGYUE ORGANIC SILICON MATERIAL
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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 from organosilicon high-boiling products. The method comprises the steps as follows: the whole composition of the high-boiling products which are the byproduct in the production process of dimethyl dichlorosilane as the organosilicon monomer is adopted as the raw material and reacts with hydrogen chloride in the presence of N,N-dimethylanlilne and tri-n-butylamine as a catalyst in a cracking kettle with a fractionating tower to obtain a mixed monomer mainly containing dimethyl dichlorosilane, trimethylchlorosilane, methyldichlorosilane and methyltrichlorosilane; and the mixed monomer is collected via the overhead condenser of the fractionating tower. The method can improve the conversion of the high-boiling products. The conversion is higher than 90%, the dimethyl dichlorosilane allows a selectivity of higher than 50%, and the selectivety of trimethylchlorosilane reaches 10%. The organosilicon monomer can be prepared at low cost.

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): C07F7/12C07F7/16
Inventor 王维东伊港于源赵玉芳宋磊周志永周玲宋明强尤启香
Owner SHANDONG DONGYUE ORGANIC SILICON MATERIAL
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