Solvent extraction purification of wet-processed phosphoric acid

Details Solvent extraction purification of wet-processed phosphoric acid Solvent extraction purification of wet-processed phosphoric acid

1977-12-12

1980-09-16

Hearn, Brian E.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

C01B 2516

Patent

active

042229944

ABSTRACT:
Wet-processed phosphoric acid is purified by counter-current extraction with the use of an organic solvent, in which water is partially soluble and which is capable of absorbing phosphoric acid, the organic phosphoric acid extract is separated from residual wet-processed phosphoric acid, unabsorbed by the solvent, and phosphoric acid is recovered from the separated organic phosphoric acid extract. More specifically, the wet-processed phosphoric acid is extracted with the use of a solvent containing more than 0 and less than 50% of water, based on the saturation concentration, and a mineral acid in a quantity corresponding to the quantity, in moles, of cation-bound phosphate in the crude acid.

REFERENCES:
patent: 3684439 (1972-08-01), Rose et al.
patent: 3953581 (1976-04-01), Ehlers et al.
patent: 3956465 (1976-05-01), Amanrich
Treybal, Liquid Extraction, 1963, pp. 225-239.

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