Process for producing ammonium polyphosphate

Details Process for producing ammonium polyphosphate Process for producing ammonium polyphosphate

1991-09-26

1992-11-24

Langel, Wayne

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423315, C01B 2540

Patent

active

051659042

ABSTRACT:
For producing substantially water-insoluble, chain-type ammonium polyphosphate, equimolar quantities of diammonium phosphate and phosphorus pentoxide are reacted at temperatures from 170.degree. to 350.degree. C. in a zone, which effects continuous mixing, kneading and comminution, in the presence of a stream of ammonia gas. In this process, the water is separated from the ammonia gas which leaves the zone and contains water vapor, and the dried ammonia gas is caused to flow again through the zone.
A plant for producing substantially water-insoluble, chain-type ammonium polyphosphate can comprise a reactor (1) into which an ammonia feed pipe (8) and pipes for feeding phosphorus pentoxide (6) and diammonium phosphate (7) lead and from which an ammonium polyphosphate discharge pipe (9) and an exit gas pipe (10) start. The exit gas pipe (10) leads into a condenser (13) which is flow-connected via a pump (14) to a heat exchanger (15). An exit gas line (18) which leads into the ammonia feed pipe (8) starts from the heat exchanger (15).

REFERENCES:
patent: 3978195 (1976-08-01), Schrodter et al.
patent: 4260592 (1981-04-01), Corver et al.
patent: 4511546 (1985-04-01), Schrodter et al.
patent: 5043151 (1991-08-01), Staffel et al.
Kirk-Othmer, Encyclopedia of Chemical Technology, Third Edition, vol. 2, p. 509, (1978), John Wiley & Sons.

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