PROCESS FOR THE MANFUACTURE OF LINEAR HYDROFLUOROCARBONS CONTAINING END GROUP HYDROGEN SUBSTITUENTS AND AZEOTROPES THEREOF

摘要

Linear hydrofluorocarbons of the formula XCF2(CF2)nCH2F where X is H or F, and n is 1 to 7 when X is H and 0 to 7 when X is F, are produced by a vapor phase catalytic reaction of HF with corresponding compounds of the formula XCF2(CF2)nCH2OY where Y is -(CO)Cl or -SO2Cl. Azeotropic compositions with HF (e.g., an azeotrope of CHF2CF2CH2F and HF) are provided, and a portion of the linear hydrofluorocarbon product (e.g., a portion of the CHF2CF2CH2F) may be recovered as an azeotropic composition and recycled.