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Abstract

Processes are provided for (i) producing Z-1,1,1,4,4,4-hexafluoro-2-butene (Z—CF₃CH═CHCF₃) from E-1,1,1,4,4,4-hexafluoro-2-butene (E-CF₃CH═CHCF₃), comprising the steps of (a) reacting the E-1,1,1,4,4,4-hexafluoro-2-butene (E-CF₃CH═CHCF₃) with chlorine to form dichloro-1,1,1,4,4,4-hexafluorobutane (CF₃CHClCHClCF₃), (b) recovering the dichloro-1,1,1,4,4,4-hexafluorobutane from step (a), (c) reacting the recovered dichloro-1,1,1,4,4,4-hexafluorobutane with base to form 1,1,1,4,4,4-hexafluoro-2-butyne (CF₃≡CCF₃), (d) recovering the 1,1,1,4,4,4-hexafluoro-2-butyne from step (c) and (e) reacting the recovered hexafluoro-2-butyne with hydrogen to form said Z-1,1,1,4,4,4-hexafluoro-2-butene, optionally wherein said E-1,1,1,4,4,4-hexafluoro-2-butene starting material is obtained by converting 1,1,1,4,4,4-hexafluoro-2-butane (F₃CHCl₂) to a mixture of Z-1,1,1,4,4,4-hexafluoro-2-butene and E-1,1,1,4,4,4-hexafluoro-2-butene and recovering the E-1,1,1,4,4,4-hexafluoro-2-butene from said mixture, whereby the E-1,1,1,4,4,4-hexafluoro-2-butene used in step (a) is the recovered E-1,1,1,4,4,4-hexafluoro-2-butene, and (ii) step (a) as a subcombination of the process (i).

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First Claim