Process for producing phosphoric acid and/or phosphates from wet

Details Process for producing phosphoric acid and/or phosphates from wet Process for producing phosphoric acid and/or phosphates from wet

1986-05-30

1988-11-01

Heller, Gregory A.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423309, 423310, C01B 2516

Patent

active

047819057

ABSTRACT:
A process is developed for producing phosphoric acid and phosphates from wet-process phosphoric acid. The crude acid is extracted with a waterimmiscible solvent mixture consisting of mixed trialkyl phosphine oxide and a diluent, wherein about 2/3 P.sub.2 O.sub.5 in the crude acid is extracted into solvent mixture and the balance remains in the raffinate. Pure phosphoric acid or phosphates are produced by stripping the loaded solvent with appropriate aqueous phase and secondary calcium phosphate fertilizer is obtained by neutralizing the raffinate with calcium carbonate.

REFERENCES:
patent: 4279876 (1986-07-01), Schrodter et al.
Niitsu et al., J. Inorg. Nucl. Chem. 1976, vol. 38, pp. 1054-1056 "Extraction of Phosphoric Acid From Various Aqueous Solutions with Trioctylphosphine Oxide".

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