Process for making long-chain ammonium polyphosphate

Details Process for making long-chain ammonium polyphosphate Process for making long-chain ammonium polyphosphate

C - Chemistry, Metallurgy

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C01B 25/28 (2006.01) C01B 25/40 (2006.01)

Patent

CA 1171634

PROCESS FOR MAKING LONG-CHAIN AMMONIUM POLYPHOSPHATE ABSTRACT OF THE DISCLOSURE The invention relates to a process for making long chain ammonium polyphosphate consisting essentially of crystalline modification II. To this end, a mixture of phosphorus pentoxide and ammonium orthophosphate in a molar ratio of 1 : 0.9 to 1 : 1.1 is reacted with 0.1 to 15 mol % of melamine or its condensation products selected from melam, melem or mellon, calculated as mel- amine, at a temperature within the range 50 to 150°C in the presence of an excess of ammonia and the reaction product is heat-treated at temperatures within the range 200 to 400°C.

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