C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/64
C01B 25/28 (2006.01) C01B 25/40 (2006.01)
Patent
CA 1191329
LINEAR, SUBSTANTIALLY WATER-INSOLUBLE AMMONIUM POLYPHOS- PHATES AND PROCESS FOR MAKING THEM ABSTRACT OF THE DISCLOSURE The disclosure relates to a process for making linear, substantially water-insoluble ammonium polyphosphates of the general formula (NH4PO3)10-1000 by heating and con- tinuously mixing phosphorus pentoxide and ammonium ortho- phosphate in the presence of ammonia and tempering the re- sulting reaction product over a period of several hours at 200 to 400°C in the presence of ammonia. To this end, the phosphorus pentoxide and ammonium orthophosphate are sub- jected at 50 to 150°C to the following successive opera- tions which provide a) for them to be reacted with ammonia over a period of 5 to 15 minutes under an overpressure of 1 - 2 milli- bars, b) for them to be mixed under nitrogen for 10 to 60 minutes at atmospheric pressure while arresting the supply of ammonia c) for them to be reacted with ammonia over a period of 1 to 3 hours under a pressure 1 to 5 millibars lower than atmospheric pressure, and the reaction product is tempered, the ammonia being used in an overall stoichiometric excess of at most 20 mol%.
421023
Maurer Alexander
Schrodter Klaus
Clariant Gmbh
Fetherstonhaugh & Co.
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