Method for preparing cinnamoyl chloride from silicon tetrachloride

A technology of silicon tetrachloride and cinnamoyl chloride, which is applied in the chemical industry, can solve the problems of polluting the environment, discharging and burying land without grass, and achieve the effect of reducing costs

Inactive Publication Date: 2016-07-20
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 site and the buried site barren.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add a certain amount of cinnamic 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.

[0020] Distill at 60-80°C, first distill off excess silicon tetrachloride. Distill under reduced pressure to collect fractions at 131°C (1.47kPa) to obtain the product cinnamoyl chloride. Or extract with benzene after cooling, and recrystallize with carbon tetrachloride to obtain cinnamoyl chloride product.

Embodiment 2

[0022] Add a certain amount of cinnamic 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.

[0023] Distill at 60-80°C, first distill off excess silicon tetrachloride. Distill under reduced pressure to collect fractions at 131°C (1.47kPa) to obtain the product cinnamoyl chloride. Or extract with benzene after cooling, and recrystallize with carbon tetrachloride to obtain cinnamoyl chloride product.

Embodiment 3

[0025] Add a certain amount of cinnamic 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.

[0026] Distill at 60-80°C, first distill off excess silicon tetrachloride. Distill under reduced pressure to collect fractions at 131°C (1.47kPa) to obtain the product cinnamoyl chloride. Or extract with benzene after cooling, and recrystallize with carbon tetrachloride to obtain cinnamoyl chloride product.

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PUM

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Abstract

The invention provides a method for preparing cinnamoyl chloride from silicon tetrachloride; the method includes the steps: with silicon tetrachloride as an acyl chlorination reagent, and carrying out a reaction with cinnamic acid for 2-4 h at the temperature of 60-70 DEG C, to obtain a cinnamoyl chloride crude product. A large amount of by-product silicon tetrachloride in polysilicon production and organosilicon production is effectively transformed to produce cinnamoyl chloride having high additional value; while the difficult-to-treat by-product silicon tetrachloride brought from the polysilicon production is transformed and treated, the cost of preparation of cinnamoyl chloride is significantly reduced.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for preparing cinnamoyl 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. ...

Claims

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Application Information

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IPC IPC(8): C07C51/60C07C57/44
CPCC07C51/60C07C57/44
Inventor 李慎新
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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