Potassium phosphate manufacture

Details Potassium phosphate manufacture Potassium phosphate manufacture

1975-07-18

1977-10-25

Spear, Jr., Frank A.

Chemistry: fertilizers

Processes and products

Inorganic material

71 40, 71 51, 71 53, 71 63, 423309, 423313, C05B 700

Patent

active

RE0294586

ABSTRACT:
Fertilizer materials, especially potassium dihydrogen phosphate, are produced by the reaction of phosphate rock or a solubilized form thereof, such as mono calcium phosphate, dicalcium phosphate, etc., concentrated sulfuric acid, potassium hydrogen sulfate and, optionally fresh or recycle phosphoric acid, the resulting mixture is filtered to remove the calcium sulfate precipitate and the potassium dihydrogen phosphate is recovered from the filtrate, either by concentration and filtration or by extraction with an organic solvent.

REFERENCES:
patent: 1929443 (1933-10-01), Miligan
patent: 2945275 (1960-09-01), Carothers et al.
patent: 3241944 (1966-03-01), Takeda et al.
patent: 3547615 (1970-12-01), Beckman
patent: 3718453 (1973-02-01), Thompson
patent: 3803884 (1974-04-01), Thompson

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