Process for the purification of phosphoric acid by extraction

Details Process for the purification of phosphoric acid by extraction Process for the purification of phosphoric acid by extraction

1976-04-13

1978-04-04

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

C01B 2516

Patent

active

040828360

ABSTRACT:
A process for the extraction of metallic impurities from an unpurified aqueous phosphoric acid phase by solvent extraction employing an organic extractant phase containing an organic sulfonic acid in its H.sup.+ form. After the extraction step and separation of the organic extractant phase from the aqueous phosphoric acid phase, residual P.sub.2 O.sub.5 values are recovered from the organic extractant phase by washing the organic extractant phase with a wash phase consisting of water or dilute phosphoric acid. The sulfonic acid in the organic extractant phase can be regenerated to its H.sup.+ form with a mineral acid and recycled.

REFERENCES:
patent: 3367749 (1968-02-01), Koerner
patent: 3458282 (1969-07-01), Koerner
patent: 3497330 (1970-02-01), Baniel et al.
patent: 3694153 (1972-09-01), Williams et al.
Ion Exchange & Metal Extraction of Metal Complexes -- Marcus et al., 1970-pp. 552 to 557.

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