Food grade phosphoric acid from wet process acid

Details Food grade phosphoric acid from wet process acid Food grade phosphoric acid from wet process acid

1975-08-14

1976-11-23

Vertiz, Oscar R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

C01B 2516

Patent

active

039937364

ABSTRACT:
A process for purifying wet process phosphoric acid to a food grade phosphoric acid by a sequence of steps including extraction, partial neutralization, dilution with water, contact with activated carbon, neutralization to a pH of from about 5 to about 9, contact with activated carbon, contact with an insoluble alkaline earth metal phosphate salt, reconversion to a purified food grade phosphoric acid, and recovery of the product acid.

REFERENCES:
patent: 2044940 (1936-06-01), Haag et al.
patent: 3645682 (1972-02-01), Cochran
patent: 3872215 (1975-03-01), Cherdron et al.
Ionics Bulletin, L-2, 1963, p. 3.

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