A kind of synthetic method of trans-1,1,1,4,4,4-hexafluoro-2-butene

A synthesis method and butene technology, applied in the direction of halogen substitution preparation, dehydrohalogenation preparation, etc., can solve the problems of high price, large pollution, low selectivity, etc., and achieve the effect of high price and low cost
CN104370690BActive Publication Date: 2016-08-17XIAN MODERN CHEM RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIAN MODERN CHEM RES INST
Publication Date
2016-08-17

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Abstract

Provided is a method for synthesising trans-1,1,1,4,4,4-hexafluoro-2-butene, said method using 1,1,1-trifluoro-2,2-dichloroethane and a chlorinated ethene CH2=CX2 as raw materials, and being divided into three steps: (a) the reaction of 1,1,1-trifluoro-2,2-dichloroethane with CH2=CX2 in the presence of a telomerisation catalyst and a catalytic additive to synthesise CF3CHClCH2CClX2; (b) the photochlorination of CF3CHClCH2CClX2 to synthesise CF3CHClCH2CCl3; (c) the gas phase fluorination of CF3CHClCH2CCl3 in the presence of a fluorination catalyst to synthesise trans-1,1,1,4,4,4-hexafluoro-2-butene. CH2=CX2 is ethene, chloroethene or 1,1-dichloroethene. The present invention has the features of high trans selectivity and inexpensive raw materials.
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Description

technical field

[0001] The invention relates to a method for synthesizing hydrofluoroolefins, in particular to a method for synthesizing trans-1,1,1,4,4,4-hexafluoro-2-butene. Background technique

[0002] Due to the destruction of the ozone layer by the first and second generation blowing agents (fluorotrichloromethane CFC-11, fluorodichloroethane HCFC-141b, etc.), the use of the third generation blowing agents (1,1, 1,3,3-pentafluoropropane (HFC-245fa, etc.) will have a strong greenhouse effect. With the increasing impact of global warming on the earth's ecology, it is urgent to find green and environmentally friendly blowing agents.

[0003] As a hydrofluoroolefin (HFO) substance, the ozone depletion potential (ODP) of cis-1,1,1,4,4,4-hexafluoro-2-butene (HFO-1336) is zero, and the greenhouse effect potential The value (GWP) is extremely low, and has little impact on the environment. Because its performance is similar to that of previous generations of blowing agents, i...

Claims

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