PROCESS FOR THE MANUFACTURE OF HALOCARBONS AND SELECTED COMPOUNDS AND AZEOTROPES WITH HF

摘要

A liquid phase process is disclosed for producing halogenated alkane adducts of the formula: CAR 1 R 2 CBR 3 R 4 (where A, B, R 1, R 2, R 3, and R 4 are as defined in the specification) which involves contacting a corresponding halogenated alkane, AB, with a corresponding olefin, CR 1 R 2 ==CR 3 R 4 in a dinitrile or cyclic carbonate ester solvent which divides the reaction mixture into two liquid phases and in the presence of a catalyst system containing: (i) at least one catalyst selected from monovalent and divalent copper; and optionally (ii) a promoter selected from aromatic or aliphatic heterocyclic compounds which contain at least one carbon-nitrogen double bond in the heterocyclic ring. When hydrochlorofluorocarbons are formed, the chlorine content may be reduced by reacting the hydrochlorofluorocarbons with HF. New compounds disclosed include CF 3 CF 2 CCl 2 CH 2 CCl 3, CF 3 CCl 2 CH 2 CH 2 Cl and CF 3 CCl 2 CH 2 CHClF. These compounds are useful as intermediates for producing hydrofluorocarbons. Azeotropes of CClF 2 CH 2 CF 3 with HF and azeotropes of CF 3 CH 2 CHF 2 with HF are also disclosed; as are processes for producing such azeotropes. A process for purification of certain hydrofluorocarbons and/or chloroprecursors thereof from mixtures of such compounds with HF is also disclosed.