Chlorine-hydrogen exchange method for converting carbon tetrachloride into chloroform

A technology of carbon tetrachloride and chloroform, applied in the field of chlorine-hydrogen exchange method for converting carbon tetrachloride into chloroform, achieving the effect of high selectivity and simple operation

Active Publication Date: 2020-05-19
BEIJING UNIV OF CHEM TECH
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there is no use of trichlorethylene, acetylene and succinimide as hydrogen donors to convert carbon tetrachl

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Chlorine-hydrogen exchange method for converting carbon tetrachloride into chloroform
  • Chlorine-hydrogen exchange method for converting carbon tetrachloride into chloroform
  • Chlorine-hydrogen exchange method for converting carbon tetrachloride into chloroform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]Take 1 part of trichloroethylene, 6 parts of carbon tetrachloride, 0.1 part of TBAF, and 1 part of potassium carbonate, put it in a round-bottom flask, and stir at room temperature for 1 h. The liquid layer was taken for gas chromatographic analysis, and the conversion rate of trichloroethylene and the yield of chloroform were calculated. At this point, the conversion of trichloroethylene reached 100%, and the selectivity to chloroform was 95%.

Embodiment 2

[0032] Take 1 part of trichloroethylene, 6 parts of carbon tetrachloride, 0.1 part of TBAF, and 1 part of sodium metaaluminate, put it in a round-bottomed flask, and stir at 20° C. for 5 h. The liquid layer was taken and analyzed by gas chromatography, and the conversion of trichloroethylene reached 100%, and the selectivity of chloroform reached 90%.

Embodiment 3

[0034] Take 1 part of trichloroethylene, 6 parts of carbon tetrachloride, 0.1 part of TBAF, and 1 part of potassium hydroxide, put them in a round-bottomed flask, and stir at 20° C. for 0.2 h. The liquid layer was taken and analyzed by gas chromatography, and the conversion of trichloroethylene reached 100%, and the selectivity of chloroform reached 92%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a chlorine-hydrogen exchange method for converting carbon tetrachloride into chloroform. A conversion reaction can be carried out at normal temperature and normal pressure; a hydrogen donor is trichloroethylene, acetylene, succinimide or other organic matters with active hydrogen, a phase transfer catalyst represented by tetrabutylammonium fluoride is utilized, and alkalineconditions are provided by using potassium hydroxide or potassium carbonate or other substances. On one hand, a noble metal catalyst is not used; on the other hand, reaction conditions are mild, operation is easy and safe, and the method has the advantages of high conversion rate and good selectivity. According to the method, carbon tetrachloride can be converted into chloroform, and meanwhile, the hydrogen donor is converted into a corresponding chlorine substitution product (namely, the hydrogen donors acetylene and trichloroethylene are converted into tetrachloroethylene, and the hydrogen donor succinimide is converted into N-chlorosuccinimide) in a high-selectivity manner, so recycling and high-valued utilization of carbon tetrachloride are realized. The method is suitable for large-scale industrial conversion of carbon tetrachloride, and has great market prospects and high economic values.

Description

technical field [0001] The invention relates to a new method for converting carbon tetrachloride into chloroform, belongs to the recycling and high-value utilization technology of wastes in the field of environmental chemical industry, and in particular relates to a chlorine- Hydrogen exchange reaction, whereby carbon tetrachloride can be converted into chloroform on a large scale, and the chlorine-substituted product of the hydrogen-donating agent can be co-produced. Background technique [0002] Carbon tetrachloride is an ozone-depleting substance (ODS). In order to fulfill the obligations of the Montreal Protocol on Substances that Deplete the Ozone Layer, my country has completely phased out the production, sale and use of carbon tetrachloride in 2010. However, in the production process of methane chloride, carbon tetrachloride is an inevitable by-product, and its by-product ratio is about 5%. my country is a big producer of methane chloride, with an annual by-product o...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C07C17/23C07C19/04
CPCC07C17/23C07C19/04
Inventor 李春喜王瑞康姜亚光
Owner BEIJING UNIV OF CHEM TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap