초록

A halocarbon product made from the reaction of excess hydrogen fluoride with a halocarbon, containing excess hydrogen fluoride as an azeotrope is purified by fluorination in the presence of additional halocarbon or halo-olefin.

대표청구항 ▼

[ What is claimed is:] [1.]1. A process wherein a halogenated hydrocarbon starting material is reacted with HF to produce a fluorination product including at least one product compound selected from the group consisting of saturated chlorofluorohydrocarbons and fluorohydrocarbons which contain from

[ What is claimed is:] [1.]1. A process wherein a halogenated hydrocarbon starting material is reacted with HF to produce a fluorination product including at least one product compound selected from the group consisting of saturated chlorofluorohydrocarbons and fluorohydrocarbons which contain from 1 to 6 carbon atoms, characterized by:(1) fluorinating said starting material with HF to provide an initial product mixture containing HF and said at least one product compound, the amount of HF for said fluorination being in sufficient excess to azeotropically combine with said at least one product compound;(2) distilling the initial product mixture of (1) to remove HCl and to recover said at least one product compound along with the HF which is azeotropically combined therewith;(3) adding additional halogenated hydrocarbon material selected from (i) halocarbons of the formula C.sub.a H.sub.b Cl.sub.c F.sub.d where a is 1 to 6, b is 0 to 13, c is 1 to 13, and d is 0 to 13, provided that b+a+d equals 2a+2 when the compound is acyclic and 2a when it is cyclic, and (ii) halo-olefins of the formula C.sub.a H.sub.b Cl.sub.c F.sub.d where a is 2 to 6, b is 0 to 11, c is 1 to 11, and d is 0 to 11, provided b+c+d equals 2a when the compound is acyclic and 2a-2 when it is cyclic, to the azeotropic composition recovered in (2) to produce a reactive mixture, the amount of said additional halogenated hydrocarbon material being a molar amount greater than the HF in said azeotropic composition and said additional halogenated hydrocarbon being additional starting material; and(4) reacting the reactive mixture of (3) in the presence of a fluorination catalyst under fluorinating conditions to produce a product mixture with reduced HF content, thereby utilizing azeotropically combined HF.