Process for removing sulfate ions from extracted phosphoric acid

Details Process for removing sulfate ions from extracted phosphoric acid Process for removing sulfate ions from extracted phosphoric acid

1976-06-22

1978-01-24

Meros, Edward J.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

210 38R, 423321S, C01B 2516

Patent

active

040704432

ABSTRACT:
A process for removing sulfate ions from extracted phosphoric acid which is substantially free of metallic ion impurities and which has been prepared by extracting wet process phosphoric acid with an organic solvent which comprises:
A. adjusting the extracted phosphoric acid concentration to a concentration greater than 70%;
B. adding an amount of a barium compound which is less than the stoichiometric equivalent amount of barium relative to the amount of dissolved sulfate ion to form barium sulfate crystals; and
C. separating said barium sulfate from the resulting slurry at a temperature less than 80.degree. C and recovering purified, extracted phosphoric acid;
Wherein the amount of barium compound added is such that said purified extracted phosphoric acid contains at least 5 ppm of sulfate ions.

REFERENCES:
patent: 1889929 (1932-12-01), Moore
patent: 3186793 (1965-06-01), Gillis
patent: 3366448 (1968-01-01), Martin et al.
Baker Chem. Catalog, - No. 620 - 1961 - p. 167.

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