Process for purifying phosphoric acid

Details Process for purifying phosphoric acid Process for purifying phosphoric acid

1985-09-09

1987-12-15

Doll, John

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423304, 423321S, C01B 2514, C01B 2516

Patent

active

047132299

ABSTRACT:
Wet process phosphoric acid is freed from heavy metal ions, especially from ions of cadmium, copper, mercury, lead and arsenic and optionally also from organic compounds and sulfuric acid. To this end, the phosphoric acid is contacted with a diorganyldithiophosphoric acid ester and an adsorbent, if desired. Prior to or after said treatment with the ester, the phosphoric acid is admixed with a reductant. The adsorbent, if any is used alone or in combination with an alkaline earth metal compound soluble in phosphoric acid.

REFERENCES:
patent: 3635661 (1972-01-01), Beckham
patent: 3993733 (1976-11-01), Irani
patent: 4164550 (1979-08-01), Hill
patent: 4256716 (1981-03-01), Sikdar
patent: 4275038 (1981-06-01), Sikdar et al.
patent: 4452768 (1984-06-01), Gradl et al.
patent: 4466948 (1984-08-01), Schimmel et al.
patent: 4503016 (1985-03-01), Schimmel et al.

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