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Method of preparing trichloro-acetic chloride from silicon tetrachloride

A technology of trichloroacetyl chloride and silicon tetrachloride, applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylate, etc., can solve the problem of refractory treatment of polysilicon and cost of by-product silicon tetrachloride trichloroacetyl chloride Advanced problems, to achieve the effect of cost reduction

Inactive Publication Date: 2016-05-25
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to provide a method for preparing trichloroacetyl chloride with silicon tetrachloride, aiming to solve the problem of the difficult-to-manage by-product silicon tetrachloride and the high cost of preparing trichloroacetyl chloride brought about by the development of polysilicon production

Method used

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  • Method of preparing trichloro-acetic chloride from silicon tetrachloride

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Experimental program
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Embodiment 1

[0029] Add a certain amount of trichloroacetic acid into an acid-resistant reaction kettle with a reflux and stirring device, add silicon tetrachloride at a molar ratio of 1:1.1, and react at 60°C for 4 hours. At the same time, excessive silicon tetrachloride and generated hydrogen chloride are recovered and treated.

[0030] Distill at 60-80°C, first distill off excess silicon tetrachloride. Raise the temperature and distill off trichloroacetyl chloride at 110-120°C.

Embodiment 2

[0032] Add a certain amount of trichloroacetic acid into an acid-resistant reaction kettle with a reflux and stirring device, add silicon tetrachloride at a molar ratio of 1:2.0, and react at 65°C for 3 hours. At the same time, excessive silicon tetrachloride and generated hydrogen chloride are recovered and processed.

[0033] Distill at 60-80°C, first distill off excess silicon tetrachloride. Raise the temperature and distill off trichloroacetyl chloride at 110-120°C.

Embodiment 3

[0035] Add a certain amount of trichloroacetic acid into an acid-resistant reaction kettle with a reflux and stirring device, add silicon tetrachloride at a molar ratio of 1:2.5, and react at 70°C for 2 hours. At the same time, excessive silicon tetrachloride and generated hydrogen chloride are recovered and processed.

[0036] Distill at 60-80°C, first distill off excess silicon tetrachloride. Raise the temperature and distill off trichloroacetyl chloride at 110-120°C.

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Abstract

The invention discloses a method of preparing trichloro-acetic chloride from silicon tetrachloride. Silicon tetrachloride serves as an acylating chlorination reagent and reacts with trichloroacetic acid for 2-4 hours at 60 DEG C-70 DEG C to generate trichloro-acetic chloride, and then trichloro-acetic chloride and other products are separated through distillation or extraction. A lot of byproduct silicon tetrachloride generated in polycrystalline silicon production and organic silicon production is effectively converted through the method, and high-additional-value trichloro-acetic chloride is produced; byproduct silicon tetrachloride which is brought by production development of polycrystalline silicon and is difficult to treat is converted, and meanwhile the cost for preparing trichloro-acetic chloride is obviously lowered.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a method for preparing trichloroacetyl chloride from silicon tetrachloride. Background technique [0002] Silicon tetrachloride is currently a by-product of polysilicon production and silicone production. In particular, a large amount of silicon tetrachloride is by-produced in polysilicon production, and about 20 tons of silicon tetrachloride are by-produced for every ton of polysilicon produced. Silicon tetrachloride is a highly toxic substance. If it is discharged and buried without treatment, it will seriously pollute the environment and make the discharge and burial places barren. At present, the conversion methods of silicon tetrachloride mainly include: production of fumed white carbon black, production of organic silicon products, production of optical fibers, conversion into trichlorosilane, etc. Their basic feature is the use of silicon in silicon tetrachloride. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/60C07C53/48
CPCC07C51/60C07C53/48
Inventor 李慎新
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING