Decolorization and purification of crude wet-process phosphoric

Details Decolorization and purification of crude wet-process phosphoric Decolorization and purification of crude wet-process phosphoric

1980-11-03

1982-05-18

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423321R, 423315, E01B 2516

Patent

active

043305164

ABSTRACT:
Crude wet-process phosphoric acid prepared by mineral acid acidulation of uncalcined phosphate rock and containing contaminating amounts of organic impurities is purified and decolorized into an essentially colorless food-grade phosphoric acid, by (i) preliminarily decolorizing such crude acid, (ii) liquid-liquid extracting said predecolorized acid with an essentially water-insoluble organic extractant, (iii) back-extracting the extracted phosphoric acid with an aqueous phase, (iv) concentrating the back-extracted aqueous phosphoric acid solution at elevated, coloration-developing temperatures, and (v) then subjecting the concentrated solution which results to a final decolorization, to afford a purified, essentially colorless phosphoric acid solution.

REFERENCES:
patent: 3607029 (1968-05-01), Goret et al.
patent: 4256570 (1981-03-01), Allen et al.

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