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Process and plant for the preparation of ammonium polyphosphate

Canadian Patent Application (CA 2,046,841): 16 pp
Process and plant for the preparation of ammonium polyphosphate
A process is described for the preparation of essentially water-insoluble, chain-form ammonium polyphosphate from equimolar amounts of diammonium phosphate and phosphorus pentoxide in the presence of ammonia at temperatures of 170-350 degrees C with constant mixing, kneading and comminution. The process comprises replacing at least some of the diammonium phosphate and phosphorus pentoxide by partially ammoniated polyphosphoric acid.

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Accession: 002194816

Related references

Production of granular urea, ammonium nitrate, and ammonium polyphosphate a process review. International Conference on Granular Fertilizers and Their Production Papers: 8-94, 1977

Preparation of ammonium polyphosphate. UK Patent Application (GB 2,077,711): 6, 1981

Process for producing ammonium polyphosphate. United States Patent (4,637,921): 9, 1987

Process development for production of ammonium polyphosphate. Fertiliser News 33(5): 37-38, 1988

Activated ammonium polyphosphate, a process for making it, and its uses. Canadian Patent (1,195,808): 11, 1985

Study of the process of production of granulated ammonium polyphosphate. Soviet Chemical Industry 14(9): 1080-1086, 1982

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Process of manufacturing stable ammonium polyphosphate fertilizers. United States Patent (4,286,982): 5, 1981

Production of granular ammonium polyphosphate from wet-process phosphoric acid. TVA Bulletin (Z-163): 16, 1984

Ammonium polyphosphate-sulfate fertilizers from wet-process phosphoric acid. United States Patent Office Defensive Publication (T101,901): 29, 1982