Purified monoammonium phosphate process

Details Purified monoammonium phosphate process Purified monoammonium phosphate process

1980-12-10

1982-04-20

Meros, Edward J.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423313, C01B 2528

Patent

active

043259278

ABSTRACT:
A method of producing purified monoammonium phosphate from wet process phosphoric acid and ammonia is provided. The ammoniation takes place in two stages, the acid being ammoniated in the first stage to a pH between about 1.5 and 2.5. This mixture is allowed to age after which the mixture is ammoniated to a pH between about 4 and 5. An impurity-containing precipitate is formed in the first and second stages of ammoniation that is easily filterable from the monoammonium phosphate solution derived from the second ammoniation stage.

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patent: 3667904 (1972-06-01), Roche et al.
patent: 3974263 (1976-08-01), Crerar et al.
Ando et al, "Ammoniation Reactions of Wet-Process Phosphoric Acid," Chuo University, Japan.
Potts et al, "Liquid Fertilizers from Wet-Process Phosphoric Acid," Chemical Engineering Progress, (vol. 58, No. 9), (Sep. 1962), pp. 89-93.
Claim 1 of U.S. Pat. No. 4,117,089.

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