A kind of synthetic method of trans-1,1,1,4,4,4-hexafluoro-2-butene
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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
Active Publication Date: 2016-08-17
XIAN MODERN CHEM RES INST
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For example: WO 2009117458 reported the synthesis of HFO-1336 by reacting a chemical amount of copper powder with HCFC-123. The ratio of cis and trans in the product is close to 1:1, which not only has low selectivity but also causes great pollution
[0005] WO 2011119370 reported the catalytic telomerization of trifluoropropene and carbon tetrachloride to synthesize tetrachlorotrifluorobutane, and catalyzed fluorination to synthesize the product 1,1,1,4,4,4-hexafluoro-2-butene, using raw materials Trifluoropropene has not yet been produced on a large scale and is expensive. The sum of the selectivities of cis-HFO-1336 and trans-HFO-1336 in the product is 93%
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Embodiment 1
[0031] (a) Add 1.4 grams of copper chloride and 3.2 grams of 2,2-bipyridine to a 500 mL titanium alloy belt stirred autoclave, dissolve them in 20 mL of methanol, replace the air in the kettle with nitrogen, and inject 312 grams of R123 and 63 g CH 2 =CHCl, reaction temperature 120°C, reaction pressure 1.2MPa, reaction time 10 hours, remove R123 and methanol from the crude product after reaction by distillation at atmospheric pressure, recycle R123 and methanol, continue vacuum distillation to collect CF 3 CHClCH 2 CHCl 2 , conversion rate 91.3%, selectivity 87.6%.
[0032] (b) Add 150 g of CF to a 500 mL quartz photochemical reactor 3 CHClCH 2 CHCl 2 Dissolve in 300mL carbon tetrachloride solution, slowly pass in about 140 grams of chlorine gas under stirring, react at 0°C for 24 hours, and continue to collect the product CF after vacuum distillation to separate carbon tetrachloride 3 CHClCH 2 CCl 3 , conversion rate 90.5%, selectivity 78.7%.
[0033] (c) In a nickel...
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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.
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...
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