Production of ammonium polyphosphates from melamine phosphates

Details Production of ammonium polyphosphates from melamine phosphates Production of ammonium polyphosphates from melamine phosphates

1976-03-17

1977-04-12

Peters, G. O.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423305, 71 43, C01B 1516, C01B 2526

Patent

active

040175898

ABSTRACT:
Ammonium polyphosphates are prepared by a process which comprises heating melamine orthophosphate prepared from impure wet-process phosphoric acid in a stream of gaseous ammonia at a temperature between 150.degree. C and 210.degree. C to produce a mixture of melamine and relatively pure short-chain ammonium polyphosphates. The solid product is extracted with water to remove the ammonium polyphosphates and free the insoluble, crystalline melamine for recycle. Thus, the only starting materials consumed in the process are phosphoric acid and ammonia.

REFERENCES:
patent: 3912802 (1975-10-01), McCullough et al.
patent: 3920796 (1975-11-01), Sheridan
T921,024, May 1974, Sheridan, 423/305.
T904,031 Nov. 1972, McCullough et al., 423/305.

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