Hydrogen fluoride recovery process

Details Hydrogen fluoride recovery process Hydrogen fluoride recovery process

1997-10-09

1998-09-01

Nguyen, Ngoc-Yen

Chemistry of inorganic compounds

Halogen or compound thereof

Hydrogen halide

423488, G01B 719

Patent

active

058007954

ABSTRACT:
Process for the recovery of hydrogen fluoride (HF) from a mixture, preferably an azeotropic mixture, of HF with water and/or an organic compound such as 134a, 125 or 133a, which comprises contacting the mixture with lithium fluoride or an alkaline earth metal fluoride to form a metal fluoride-hydrogen fluoride compound (e.g. lithium bifluoride, LiHF.sub.2), separating the compound and decomposing it to liberate hydrogen fluoride therefrom. The process is useful for recovering HF from azeotropic or azeotropic-like mixtures.

REFERENCES:
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patent: 3157469 (1964-11-01), Tuggs
patent: 3195979 (1965-07-01), Burkert et al.
patent: 3314755 (1967-04-01), Claus
patent: 3574542 (1971-04-01), Hartig
patent: 3976447 (1976-08-01), Merchant et al.
Chemical Abstract 78: 140845q "Study of Thermal Stability . . . Method" vol. 78, No. 22, Jun. 1973.
Chemical Abstract 81: 144823r: "Physical Chemical Studies of Likium Hydro-Fluoride", vol. 81, No. 22, Dec. 1974.
Chemical Abstract 85: 167447t: "The Binary Systems Lithium-Fluoride-Hydrogen Fluoride . . . Fluoride", vol. 85, No. 22, Nov. 1976.
Database WPI Week 9106 Derwent Publications Ltd., London, GB ANN 91-04128/06 & SU,A,1 549 581 (E. F. Lednev) 15 Mar. 1990.

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