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 CAR¹R²CBR³R⁴ (where A, B, R¹, R², R³, and R⁴ are as defined in the specification) which involves contacting a corresponding halogenated alkane, AB, with a corresponding olefin, CR¹R²-CR³R⁴ 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 CF₃CF₂CCl₂CH₂CCl₃, CF₃CCl₂CH₂CH₂Cl and CF₃CCl₂CH₂CHClF. These compounds are useful as intermediates for producing hydrofluorocarbons. Azeotropes of CClF₂CH₂CF₃ with HF and azeotropes of CF₃CH₂CHF₂ with HF are also disclosed; as are process for producing such azeotropes. A process for purification of certain hydrofluorocarbons and/or chloro-precursors thereof from mixtures of such compounds with HF is also disclosed.