Production of anhydrous hydrogen fluoride from low-grade metalli

Details Production of anhydrous hydrogen fluoride from low-grade metalli Production of anhydrous hydrogen fluoride from low-grade metalli

1983-12-15

1984-10-16

Kaplan, G. L.

Chemistry of inorganic compounds

Halogen or compound thereof

Hydrogen halide

423483, 423484, 423551, 423554, 423555, 423556, C01B 719

Patent

active

044774257

ABSTRACT:
A novel method is provided for the production of anhydrous hydrofluoric acid from low-grade metallic fluorides using an intermediate aluminum fluoride compound. The method involves the reaction of low-grade metallic fluorides such as fluorspar with sulfuric acid to produce weak hydrofluoric acid. The weak acid is then reacted with a metallic salt (such as aluminum chloride) to form precipitated aluminum fluoride (AlF.sub.3.3H.sub.2 O). After dewatering, the aluminum fluoride is reacted with strong sulfuric acid to form aluminum sulfate and strong hydrofluoric acid.

REFERENCES:
patent: 3029134 (1962-04-01), Cardon
patent: 3996340 (1976-12-01), Steineke
patent: 4298586 (1981-11-01), Sikdar
patent: 4399113 (1983-08-01), Tosaka et al.

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