Chemistry: fertilizers – Processes and products – Inorganic material
Patent
1974-05-28
1976-08-17
Thomas, Earl C.
Chemistry: fertilizers
Processes and products
Inorganic material
423321S, C05B 700
Patent
active
039751783
ABSTRACT:
Our invention relates to an improved process for the partial purification of wet-process phosphoric acid with co-production of impure phosphoric acid or solid fertilizer materials containing most of the impurities originally present in the crude acid. The crude acid is treated with methanol and ammonia to precipitate most of the metallic and fluorine impurities as solid ammonium metallic phosphates and fluorine compounds that filter and settle rapidly. The solids are separated from the reaction mixture and methanol is distilled from the resulting clarified solution to form concentrated partially purified acid. The solid ammonium metallic phosphates are fertilizer materials. Alternately, the reaction slurry is separated into a clarified liquid fraction and a settled slurry fraction. Methanol is distilled from the settled fraction which causes most of the impurities to redissolve yielding an impure phosphoric acid.
REFERENCES:
patent: 3479139 (1969-11-01), Koerner
patent: 3635669 (1972-01-01), Rubin
patent: 3663168 (1972-05-01), Rubin et al.
patent: 3764657 (1973-10-01), Frankenfeld
Frederick Leland L.
McCullough John F.
Petrusek Robert A.
Tennessee Valley Authority
Thomas Earl C.
Wheelock Eugene T.
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