Process for production of ammonium polyphosphates

Details Process for production of ammonium polyphosphates Process for production of ammonium polyphosphates

1973-06-11

1976-02-17

Vertz, Oscar R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423310, 71 43, C01B 1516, C01B 2526

Patent

active

039392554

ABSTRACT:
Ammonium polyphosphates having a major portion of the P.sub.2 O.sub.5 content thereof in the form of condensed phosphates are prepared by reacting wet-process phosphoric acid directly with ammonia under specified conditions. It is demonstrated that exchange and recovery of heat from the hot ammonium polyphosphate reaction mixture is critical to allow production of ammonium polyphosphate solutions from orthophosphoric acid and ammonia with polyphosphate contents high enough for chelating inherent impurities during extended periods of storage. Moreover, the present invention avoids substantial corrosion of the equipment.

REFERENCES:
patent: 3044851 (1962-07-01), Young
patent: 3464808 (1969-09-01), Kearns
patent: 3492087 (1970-01-01), MacGregor et al.
patent: 3677734 (1972-07-01), Carroll et al.
patent: 3734708 (1973-05-01), Burns

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