Process for the manufacture of ammonium polyphosphate

Details Process for the manufacture of ammonium polyphosphate Process for the manufacture of ammonium polyphosphate

1976-03-22

1978-08-01

Thomas, Earl C.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423313, 423310, 71 43, C01B 1516, C01B 2526

Patent

active

041043626

ABSTRACT:
Ammonium polyphosphate is manufactured on a continuous basis by reacting gaseous ammonia and aqueous phosphoric acid at elevated temperatures in a one or multiple stage falling film reaction zone in the presence of a diluting gas if desired, using wet phosphoric acid, preferably containing 28-32%, by weight P.sub.2 O.sub.5 and an excess of ammonia. The phosphoric acid and the gaseous ammonia are preferably carried in counterflow and the temperature in the falling film reaction zone is adjusted using heat transfer fluids to within the range of 120.degree. - 260.degree. C.

REFERENCES:
patent: 2950180 (1960-08-01), Kunzer et al.
patent: 3395990 (1968-08-01), Ballestia
patent: 3397036 (1968-08-01), Narins et al.
patent: 3503706 (1970-03-01), Legal
patent: 3723086 (1973-03-01), Poynor et al.
patent: 3730700 (1973-05-01), Groenveld
Brauer, VDI - Forschungsheft No. 457.
Smegal et al., Seife, Ole, Fette, Wachse 27, (1971), No. 20, 703-708.

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