Process for producing hydrogen fluoride

Details Process for producing hydrogen fluoride Process for producing hydrogen fluoride

1980-07-09

1982-01-12

Thomas, Earl C.

Chemistry of inorganic compounds

Halogen or compound thereof

Hydrogen halide

423111, 423240, 423485, C01B 719

Patent

active

043105017

ABSTRACT:
A method of recovering fluorine, e.g. as hydrogen fluoride, from wastes of aluminum electrolysis furnaces, chemisorbents, adsorbents or absorbents, etc. in which the fluorine-containing material is subjected to pyrohydrolysis in an expanded fluid bed and the HF-containing gas is subjected to condensation or scrubbing for the removal of the HF therefrom. According to the invention, the exhaust gases from the fluidized bed are cooled by direct contact with solids which can be circulated in a separate cycle and are themselves cooled in a cooler, e.g. by contact with gas which is to be fed to the expanded fluidized bed. The circulated solids thus allow recovery of the sensible heat of the gas without diluting it.

REFERENCES:
patent: 3565408 (1971-02-01), Reh et al.
patent: 3981355 (1976-09-01), Squires
patent: 4006066 (1977-02-01), Sparwald
patent: 4065551 (1977-12-01), Dahl
patent: 4113832 (1978-09-01), Bell
patent: 4160808 (1979-07-01), Anderson
patent: 4160809 (1979-07-01), Anderson et al.

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