Patent ID: 8604257

Claim:
A process for manufacturing cis-hexafluororo-2-butene comprising the steps of: (a) contacting 1,1,1-trichloro-2,2,2-trifluoroethane (CFC-113a) with an ethene compound having two, three or four chlorine substituents in the presence of an addition reaction catalyst under conditions effective to facilitate an addition reaction to form a product stream comprising a compound of the formula CF 3 CCl 2 CXClCXCl 2 where X=H or Cl; (b) contacting chlorine with the product stream formed in step (a) under conditions effective to facilitate a chlorination reaction and to form a product stream comprising CF 3 CCl 2 CCl 2 CCl 3 ; (c) contacting HF with the CF 3 CCl 2 CCl 2 CCl 3 formed in step (a) or step (b) under conditions effective to facilitate a fluorination reaction and to form a product stream comprising CF 3 CCl 2 CCl 2 CF 3 and/or 2,3-dichloro-1,1,1,4,4,4-hexafluoro-2-butene; and (d) dehydrohalogenating, or hydrodechlorinating, and reducing the CF 3 CCl 2 CCl 2 CF 3 and/or 2,3-dichloro-1,1,1,4,4,4-hexafluoro-2-butene formed in step (c) under conditions effective to form a product stream comprising cis-1,1,1,4,4,4-hexafluoro-2-butene.