Process for producing purified monoammonium phosphate from wet p

Details Process for producing purified monoammonium phosphate from wet p Process for producing purified monoammonium phosphate from wet p

1985-03-08

1986-09-09

Doll, John

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423313, C01B 2528

Patent

active

046108530

ABSTRACT:
A process for producing purified monoammonium phosphate (abbreviated to MAP) directly from wet process phosphoric acid with a high yield is provided, which process comprises reacting wet process phosphoric acid with NH.sub.3 at 50.degree..about.80.degree. C. while keeping the molar ratio of NH.sub.3 /H.sub.3 PO.sub.4 at 0.9.about.1.35; separating the resulting slurry containing MAP crystals and an insoluble sludge into a slurry containing the former and a slurry containing the latter; treating the former slurry in a conventional manner to recover MAP; while treating the latter slurry by heating it to 60.degree..about.95.degree. C. to dissolve MAP contained therein, removing the sludge by centrifugal separation and concentrating the filtrate to recover MAP; and combining the two portions of MAP.

REFERENCES:
patent: 995898 (1911-06-01), Peacock
patent: 1208877 (1916-12-01), Wollenweber
patent: 1264513 (1918-04-01), Hechenbleikner
patent: 1716415 (1929-06-01), Buchanan
patent: 4017588 (1977-04-01), Davidson
patent: 4325927 (1982-04-01), Weston et al.

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