Improved process for separating and recovering fluorocarbons...

Details Improved process for separating and recovering fluorocarbons... Improved process for separating and recovering fluorocarbons...

C - Chemistry, Metallurgy

01

B

C01B 7/19 (2006.01) C07C 17/38 (2006.01) C07C 19/08 (2006.01)

Patent

CA 2120921

2120921 9308147 PCTABS00021 A process for separating and recovering an organic phase (e.g., fluorocarbons such as chlorofluorocarbons, hydrochlorofluorocarbons, hydrofluorocarbons and perfluorocarbons) from a feed stream of a mixture of fluorocarbons and hydrogen fluoride, wherein the mixture is characterized as forming at least one azeotrope or azeotrope-like composition involving at least one fluorocarbon and hydrogen fluoride, by passing the fluorocarbon/HF mixture feed stream through the feed side of a semipermeable membrane unit and then further separating a fluorocarbon-depleted hydrogen fluoride permeate stream and a fluorocarbon enriched residual stream exiting the membrane unit by conventional distillation. An essentially pure fluorocarbon phase and hydrogen fluoride phase are recovered from the distillation with the azeotrope or azeotrope-like distillate being recycled to the inlet of the semi-permeable membrane unit.

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