Patent ID: 8871987
Filing Date: 2014-10-28
Classification: C07B,C07C

Abstract:
1. A process for separating cis-1,1,1,4,4,4-hexafluoro-2-butene from a first mixture comprising cis-1,1,1,4,4,4-hexafluoro-2-butene and at least one chlorofluoroolefin, comprising the steps of: a) contacting said first mixture with at least one extractive agent, to form a second mixture; b) distilling said second mixture; and c) recovering cis-1,1,1,4,4,4-hexafluoro-2-butene substantially free of said at least one chlorofluoroolefin, wherein said at least one chlorofluoroolefin is one or more of trans-1,1,1,4,4,4-hexafluoro-2-chloro-2-butene, cis-1,1,1,4,4,4-hexafluouro-2-chloro-2-butene and 1,1,1,2,4,4,4-heptafluoro-3-chloro-2-butene.