Purification of wet-process phosphoric acid

Details Purification of wet-process phosphoric acid Purification of wet-process phosphoric acid

1987-09-18

1988-09-06

Therkorn, Ernest G.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423321R, 210638, C01B 2522, C01B 25234, C01B 2546

Patent

active

047692260

ABSTRACT:
Crude wet-process phosphoric acid is purified by treating a dilute such acid with a molybdenum value reducing amount of hydrogen sulfide or of a sulfide which in situ forms hydrogen sulfide, to afford a purified acid adopted for the production of food grade phosphoric acid, and which has a content in heavy metal and molybdenum values of less than 10 ppm.

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"Chemical Abstracts", vol. 96, No. 6, Feb. 8, 1982, p. 156, 37774p.

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