Ammonium phosphate production and the reduction of fluorine and

Details Ammonium phosphate production and the reduction of fluorine and Ammonium phosphate production and the reduction of fluorine and

1975-10-23

1977-03-08

Vertiz, Oscar R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423310, 423321R, 423341, 55 71, 71 43, C01B 1516, C01B 2526, B01D 1900

Patent

active

040113019

ABSTRACT:
Ammonium phosphates are produced from wet-process phosphoric acids containing silicon and fluorine compounds by preconcentrating the acid and evolving some of the water, silicon and fluorine compounds as a vapor phase, maintaining it at a temperature above about 50.degree. C., neutralizing the liquid acid concentrate with ammonia, and absorbing the isolated vapor phase from the evaporation zone in a relatively cool, neutralized ammonium phosphate solution at a pH of at least about 5.5.

REFERENCES:
patent: 3151941 (1964-10-01), Hollingsworth
patent: 3310371 (1967-03-01), Lutz
patent: 3382059 (1968-05-01), Getsinger
patent: 3687618 (1972-08-01), Clausen

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