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US 2011/0237844 A1Published application
Method for making hexafluoro-2-butene
AssigneeHoneywell International Inc.
InventorsHsueh Sung Tung, Haiyou Wang
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Abstract
Hexafluoro-2-butene (HFO-1336) is a low global warming potential blowing agent, refrigerant and solvent. This invention provides a method for making the compound, including the cis-isomer, from the readily available raw materials, carbon tetrachloride and 3,3,3-trifluoropropene. The trans-isomer formed in the process can be isomerized into cis-isomer by the use of an isomerization catalyst.
Claims34
A process for manufacturing cis-hexafluoro-2-butene comprising the steps of:
- (a) contacting carbon tetrachloride with 3,3,3-trifluoropropene in the presence of an effective amount of a metal catalyst complex comprising a metal and an organic ligand under conditions effective to facilitate an addition reaction and to form a product stream comprising CF3CHClCH2CCl3,
- (b) contacting HF with the CF3CHClCH2CCl3 formed in step (a) under conditions effective to facilitate a fluorination reaction and to form a product stream mixture comprising cis- and trans-1,1,1,4,4,4-hexafluoro-2-butene, and isolating the cis-1,1,1,4,4,4-hexafluoro-2-butene from the mixture.
Dependencies are inferred from the claim text.