Method for producing ammonium polyphosphate

Details Method for producing ammonium polyphosphate Method for producing ammonium polyphosphate

1987-07-21

1989-05-23

Heller, Gregory A.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423305, 71 43, C01B 1516, C01B 2526

Patent

active

048329282

ABSTRACT:
A method of continuously producing ammonium polyphosphate by the reaction of urea and polyphosphoric acid, over a wide range of molecular weights, in a pre-mix slurry, under controlled temperature of about 315.degree.+/-15.degree. C. The slurry is reacted on a hot, continuously moving surface and forms ammonium polyphosphate in an ammonia atmosphere. Preferably, the pre-mixed slurry is added to a screw-type extruder, where the material comes in contact with the ammonia along the preheated moving surfaces of the extruder. The ammonium polyphosphate is scraped from the extrusion screw into a container with minimum handling. The material can be ground to a finer consistency if desired.

REFERENCES:
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patent: 3653821 (1972-04-01), Heymer et al.
patent: 3723074 (1973-03-01), Sears et al.
patent: 3839276 (1974-10-01), Rohlfs et al.
patent: 3976752 (1976-08-01), Corver et al.
patent: 3978195 (1976-08-01), Schrodter et al.
patent: 4260592 (1981-04-01), Corver et al.
patent: 4687651 (1987-08-01), Parker et al.

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