Purifying hydrofluoric acid

Details Purifying hydrofluoric acid Purifying hydrofluoric acid

1978-01-27

1979-04-17

Hearn, Brian

Chemistry of inorganic compounds

Halogen or compound thereof

Hydrogen halide

423488, C01B 722

Patent

active

041501020

ABSTRACT:
A process for the production of highly pure concentrated hydrofluoric acid by purifying crude HF gas containing H.sub.2 O, SO.sub.2, SiF.sub.4, S,CaF.sub.2, H.sub.2 SO.sub.4 and CaSO.sub.4 and obtained in the reaction of fluorite and sulphuric acid, whereby the resultant HF has an H.sub.2 SO.sub.4 content of the order of a few ppm, there are substantially no deposits of CaSO.sub.4 in the first H.sub.2 SO.sub.4 washing circuit and the service life of the system is considerably lengthened.

REFERENCES:
patent: 3725536 (1973-04-01), Gentili
patent: 3919399 (1975-11-01), Schabacher et al.
patent: 4031191 (1977-06-01), Burrus

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