Process for producing purified diammonium phosphate from wet pro

Details Process for producing purified diammonium phosphate from wet pro Process for producing purified diammonium phosphate from wet pro

1985-03-11

1986-09-09

Doll, John

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423313, C01B 2528

Patent

active

046108629

ABSTRACT:
A process for producing purified diammonium phosphate (abbreviated to DAP) 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 1.65-1.90; separating the resulting slurry containing DAP 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 DAP; while treating the latter slurry by heating it to 60.degree..about.95.degree. C. to dissolve DAP contained therein, removing the sludge by centrifugal separation and concentrating the filtrate to recover DAP; and combining the two portions of DAP.

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: 3514255 (1978-05-01), Wiener
patent: 4325927 (1982-04-01), Weston et al.

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