Production of granular ammonium-polyphosphate with an inline rea

Details Production of granular ammonium-polyphosphate with an inline rea Production of granular ammonium-polyphosphate with an inline rea

1982-09-03

1984-01-24

Schor, Kenneth M.

Chemistry: fertilizers

Processes and products

Inorganic material

71 43, 71 44, 71 6405, 71 6408, 423305, C05B 106

Patent

active

044274335

ABSTRACT:
Method for production of granular ammonium polyphosphate fertilizer in which ammonium polyphosphate melt is prepared in a simple inline reactor and distributed onto a bed of solids in a drum granulator to bind smaller fertilizer particles into granules. The desired polyphosphate content can be obtained in the granular product by adjusting the total heat input of the feed reactants to the reactor by means of energy conservation modifications to the system. Energy losses are controlled by use of a predetermined quantity of insulation so that varying amounts of the maximum theoretical heat input can be utilized to produce products of polyphosphate contents as desired. The quantities of insulation and the resulting heat inputs to the reactor have been identified which will produce the given critical polyphosphate content material, determined to be 12 percent of total phosphate as polyphosphate in a granular material, which will give 10 percent polyphosphate in a suspension fertilizer made from the granular material. No external heat is required and energy and production savings can be readily realized.

REFERENCES:
patent: T101203 (1981-11-01), Parker et al.
patent: 3649175 (1972-03-01), Legal
patent: 3734708 (1973-05-01), Burns
patent: 3917475 (1975-11-01), Moore et al.
patent: 4134750 (1979-01-01), Norton et al.
patent: 4211546 (1980-07-01), Jensen
patent: 4337079 (1982-06-01), Mann et al.
patent: 4377406 (1983-03-01), Achorn et al.
Weast; CRC Handbook of Chemistry & Physics, 62nd Ed.; 1981; p. F-107.

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