Process for producing ammonium polyphosphate which gives a...

Details Process for producing ammonium polyphosphate which gives a... Process for producing ammonium polyphosphate which gives a...

C - Chemistry, Metallurgy

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C01B 25/28 (2006.01) C01B 25/26 (2006.01) C01B 25/40 (2006.01) C09D 5/18 (2006.01)

Patent

CA 2021351

HOE 89/H 021 Process for producing ammonium polyphosphate which gives a low-viscosity aqueous suspension Abstract of the disclosure A process for producing essentially water-insoluble, chain-type ammonium polyphosphates of the general formula (NH4PO3)n, in which n is a number from 10 to 1,000, whose 20% by weight aqueous suspension prepared at 60°C has a viscosity of less than 100 mPa.s at 20°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 tempera- ture from 100 to 300°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 to 300°C under an ammonia atmos- phere. Advantageously, the reaction is carried out in a kneader.

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