Chlorine-hydrogen exchange method for converting carbon tetrachloride into chloroform

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...

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