Production of solid ammonium polyphosphate by controlled cooling

Details Production of solid ammonium polyphosphate by controlled cooling Production of solid ammonium polyphosphate by controlled cooling

1976-04-09

1980-12-02

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423305, 71 43, C01B 1516, C01B 2526

Patent

active

042371066

ABSTRACT:
Process for the production of solid ammonium polyphosphate in which ammonium phosphate melt is prepared in a pipe reactor and is solidified by controlled cooling to form crystals of a size and in quantity suitable to yield a hard, nontacky, and friable solid. Wet-process phosphoric acid is ammoniated in a pipe reactor to an NH.sub.3 :H.sub.3 PO.sub.4 mole ratio of about 1.0, and the resulting melt is agitated and simultaneously partially cooled by application of recycled pulverized product or air or a water jacket. The partially cooled melt is then solidified continuously into nontacky sheets on a water-cooled metal surface using warm water to slowly remove sensible heat and heat of crystallization. Up to about 55 percent or higher of the P.sub.2 O.sub.5 in the product may be polyphosphate. Without controlled cooling, a supersaturated solution or a microcrystalline texture results and the product is rather like a gel.

REFERENCES:
patent: 3420638 (1969-01-01), Cutter et al.
patent: 3537814 (1970-11-01), Farr et al.
patent: 3649175 (1972-02-01), Legal
patent: 3733191 (1973-05-01), Meline et al.
patent: 3985538 (1976-10-01), Hicks et al.

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