Process for prilling urea
AssigneeThe Standard Oil Company (Ohio)
InventorNorris J. Landis
Life of this patent
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Abstract
Urea prills are obtained by contacting molten urea droplets with a co-current gas stream in a prill tower and cooling and collecting the prills thus formed in a fluidized bed having a second gas stream flowing countercurrent to the prills.
Claims8
A process for prilling a material in a tower wherein droplets of molten material fall through a first zone and are contacted co-currently with a first gas stream and at least partially solidifying said material thereby forming a prill, and cooling and collecting said prills in a second zone comprising a fluid bed, said bed being maintained by a second gas stream flowing countercurrent to the first gas stream, wherein both first and second gas stream exit near the bottom of the tower.
Dependencies are inferred from the claim text.