Purification of wet process phosphoric acid

Details Purification of wet process phosphoric acid Purification of wet process phosphoric acid

1978-04-26

1980-07-29

Langel, Wayne A.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

23307, 159 17R, 159 29, 423321R, C01B 2540, C01B 2516, B01D 100

Patent

active

042150981

ABSTRACT:
Wet process phosphoric acid is heated, preferably in carbon apparatus, by passing alternating current through the acid, to concentrations above 80% P.sub.2 O.sub.5 and preferably temperatures above 500.degree. C. to remove sulphate and fluoride and convert organic and basic impurities into a filterable precipitate: the acid is separated from the precipitate to provide a high purity crystallizable product.

REFERENCES:
patent: 3317306 (1967-05-01), Getsinger
patent: 3499729 (1970-03-01), Maunsell
patent: 3664929 (1972-05-01), White
patent: 3764655 (1973-10-01), Ehlers
patent: 3912803 (1976-12-01), Williams et al.
patent: 3991164 (1976-11-01), Scheibitz et al.
patent: 4048289 (1977-09-01), Pierres
patent: 4083934 (1977-01-01), Jernigan

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