Patent ID: 6333440
Filing Date: 2001-12-25
Classification: C07C

Abstract:
A process for obtaining octafluorocyclobutane of increased purity from a mixture comprising (a) octafluorocyclobutane and (b) at least one halocarbon impurity which is difficult to separate from octafluorocyclobutane by distillation, comprising:(1) contacting the mixture with a catalyst in the vapor phase in the presence of at least one hydrogen halide selected from the group consisting of HCl and HF at a temperature sufficient to react component (b) impurity with said hydrogen halide to provide a product mixture comprising halogenated product which is more easily separated from octafluorocyclobutane by distillation than the unreacted impurity; and(2) separating halogenated product obtained in (1) from octafluorocyclobutane by distillation.