Process for producing ammonium polyphosphate of crystalline form

Details Process for producing ammonium polyphosphate of crystalline form Process for producing ammonium polyphosphate of crystalline form

1995-12-28

1998-02-17

Langel, Wayne

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423315, C01B 2540

Patent

active

057188750

ABSTRACT:
A process for producing ammonium polyphosphate of crystalline form II is described, which comprises heating a mixture of a phosphate-containing substance and a condensation agent in an ammoniacal wet air atmosphere in the presence of ammonium polyphosphate of crystalline form II as a compound for crystal formation (seed compound) to condense the phosphate-containing substance with the condensation agent.

REFERENCES:
patent: 3333921 (1967-08-01), Knollmueller
patent: 3397035 (1968-08-01), Shen et al.
Chemical Abstracts 92(18): 155, Abstract No. 149371d (May 5, 1980).
"Preparation and Characterization of Crystalline Long-Chain Ammonium Polyphosphates", Shen et al., Journal of the American Chemical Society, vol. 91, pp. 62-67, Jan. 1, 1969.

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