Production of ammonium phosphates and product thereof

Details Production of ammonium phosphates and product thereof Production of ammonium phosphates and product thereof

1967-07-03

1977-03-08

Carter, Herbert T.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

71 1, 71 34, 71 36, 71 40, 71 43, 71 44, 423315, 423317, C01B 2528

Patent

active

RE0291498

ABSTRACT:
Ammonium phosphate solutions free of precipitates are prepared from wet-process phosphoric acid containing incidental metallic impurities such as iron, aluminum and magnesium by concentration of the phosphoric acid to an anhydrous state and the formation of acyclic polyphosphoric acids therein which prevent the precipitation of the metallic impurities upon neutralization. The acid is heated to a temperature greater than 120.degree. C. at atmospheric or subatmospheric pressures while removing the volatile impurities and thereafter is neutralized with ammonia. The neutralization step can be performed at elevated temperatures with anhydrous ammonia or the acid can be cooled and neutralized at ambient temperatures. The resulting ammonium phosphate is diluted with water to obtain an ammonium phosphate solution which is clear and free of precipitates.

REFERENCES:
patent: 1078887 (1913-11-01), Wilson
patent: 1115044 (1914-10-01), Washburn
patent: 1879204 (1932-09-01), Guillisen
patent: 2415797 (1947-02-01), Low
patent: 2792286 (1957-05-01), Wordie et al.
patent: 2799569 (1957-07-01), Wordie et al.
patent: 3015552 (1962-01-01), Striplin et al.
"Proceedings of the Liquid Fertilizer Conference," June 11, 1959, Tennessee Valley Authority, Division of Chemical Development, pp. 17-20, 26-30, 52-54.
Waggaman, "Phosphoric Acid, Phosphates, and Phosphatic Fertilizers," 2nd ed., 1952, Reinhold Pub., New York, p. 229.

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