Process for separating and recovering fluorocarbons and hydrogen

Details Process for separating and recovering fluorocarbons and hydrogen Process for separating and recovering fluorocarbons and hydrogen

1991-10-18

1993-03-23

Cintins, Marianne M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

55 16, 55158, 203 39, 203 67, 423483, 423488, C07C 1738, B01D 5910

Patent

active

051966166

ABSTRACT:
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 semipermeable membrane unit.

REFERENCES:
patent: 3947558 (1976-03-01), van Eijl
patent: 4424067 (1984-01-01), Tarasenko et al.
patent: 4661296 (1987-04-01), Grote et al.

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