Process for producing ammonium polyphosphate which gives a low-v

Details Process for producing ammonium polyphosphate which gives a low-v Process for producing ammonium polyphosphate which gives a low-v

1990-07-20

1991-08-27

Heller, Gregory A.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423315, C01B 1516, C01B 2526, C05B 1100

Patent

active

050431510

ABSTRACT:
A process for producing essentially water-insoluble, chain-type ammonium polyphosphates of the general formula (NH.sub.4 PO.sub.3).sub.n, in which n is a number from 10 to 1,000, whose 20% by weight aqueous suspension prepared at 60.degree. C. has a viscosity of less than 100 mPa.s at 20.degree. C., is indicated, which comprises allowing a reaction mixture of ammonium orthophosphate and phosphorus pentoxide to react fully at a high mixing intensity in a crumbly phase at a temperature from 100.degree. to 300.degree. C. over a period of from 10 to 60 minutes and then heat-treating the reaction material in a known manner over a period of from 50 to 200 minutes at a temperature from 200.degree. to 300.degree. C. under an ammonia atmosphere.
Advantageously, the reaction is carried out in a kneader.

REFERENCES:
patent: 3978195 (1976-08-01), Schrodter et al.
patent: 4687651 (1987-08-01), Parker et al.
patent: 4832928 (1989-05-01), Parker et al.

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