Process for the preparation of ammonium polyphosphate

Details Process for the preparation of ammonium polyphosphate Process for the preparation of ammonium polyphosphate

1992-09-25

1994-01-11

Langel, Wayne

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423315, C01B 2540

Patent

active

052778878

ABSTRACT:
To prepare essentially water-insoluble, long-chain ammonium polyphosphate, in a first stage, ammonium orthophosphate and phosphorus pentoxide are reacted in the presence of gaseous ammonia in a reactor equipped in its interior with mixing, kneading and comminution apparatus, until the drive motor of the reactor passes through the second current peak in its current consumption/time diagram. In a second stage, the material discharged from the reactor is then fed to a disk dryer, the heating disks of which are maintained at temperatures of 240.degree. to 300.degree. C., whereas its lower cooling disk has temperatures of 5.degree. to 45.degree. C. The material, which covers the disks of the disk dryer at a layer thickness of 5 to 20 mm, has a residence time of 35 to 70 minutes in the disk dryer, while ammonia-containing gas is continuously passed through the disk dryer. Finally, the ammonia-containing gas exiting the disk dryer is freed from water vapor contained therein by condensation and the ammonia-containing gas is reheated prior to its entry into the disk dryer.

REFERENCES:
patent: 3978195 (1976-08-01), Schrodter et al.
patent: 5043151 (1991-08-01), Staffel et al.
patent: 5158752 (1992-10-01), Staffel et al.
patent: 5165904 (1992-11-01), Staffel et al.

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