Method and an installation for obtaining or recovering hydrofluo

Details Method and an installation for obtaining or recovering hydrofluo Method and an installation for obtaining or recovering hydrofluo

1980-06-13

1982-04-20

Thomas, Earl C.

Chemistry of inorganic compounds

Halogen or compound thereof

Hydrogen halide

423484, C01B 719

Patent

active

043259359

ABSTRACT:
A method of obtaining or recovering hydrofluoric acid from metal fluorides and solutions containing such, e.g. pickling solutions. In this procedure heavy metal fluorides are brought into contact with water vapor at 200.degree. C. to 800.degree. C., with an overall pressure of about 1 bar keeping the vapor partial pressure in a sufficiently linear relationship with the temperature in this range at a minimum of 0.9 bar at 400.degree. C. and at a minimum of 0.5 bar at 600.degree. C., separating the solid reaction material from the gaseous phase while still hot and obtaining aqueous hydrofluoric acid from the latter by--preferably indirect--cooling.

REFERENCES:
patent: 3073676 (1963-01-01), Mollard et al.
patent: 3198600 (1965-08-01), Mollard et al.
patent: 3511603 (1970-05-01), Yaws
patent: 3852430 (1974-12-01), Lienau et al.
patent: 3961030 (1976-06-01), Wiewiorowski et al.

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