Method of purification of phosphoric acid

Details Method of purification of phosphoric acid Method of purification of phosphoric acid

1983-10-03

1985-01-22

Heller, Gregory A.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423313, 423316, 423317, C01B 2516

Patent

active

044951655

ABSTRACT:
Appreciable inorganic impurities and organic matter are removed from impure phosphoric acid, particularly wet-process phosphoric acid, by pyrolysis of a mixture containing the raw acid and porous carbonaceous matter, including carbohydrates and chars, then leaching the pyrolyzed residue therefrom with a suitable solvent such as water to extract the purified phosphoric acid.

REFERENCES:
patent: 1981145 (1934-11-01), Keller
patent: 2492714 (1948-12-01), Singer
patent: 3122415 (1964-02-01), Gilchrist
patent: 3860023 (1975-06-01), Pendergrast
patent: 3917805 (1975-11-01), Takahara
patent: 3993733 (1976-11-01), Irani
patent: 3993736 (1976-11-01), Irani
patent: 4256570 (1981-03-01), Allen et al.
patent: 4299805 (1981-11-01), Wells
patent: 4369168 (1983-01-01), Wells et al.

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