Method for making urea prills and urea prills obtained by applyi

Details Method for making urea prills and urea prills obtained by applyi Method for making urea prills and urea prills obtained by applyi

1981-03-27

1983-06-28

Hall, James R.

Plastic and nonmetallic article shaping or treating: processes

Formation of solid particulate material directly from molten...

Coated particles

264 14, 264 8, B01J 204

Patent

active

043904831

ABSTRACT:
A method for producing urea prills by passing molten droplets of substantially water free urea downwardly through a cooling zone countercurrent to a cooling gas. A dispersion of crystalline particles is maintained in at least a portion of the cooling zone, the crystalline particles having average dimensions of between 2 and 10 microns and being dispersed in the cooling gas in a quantity of between about 8 and 25 mg per m.sup.3 of the cooling gas at ambient temperature and pressure, whereby urea prills, built up of relatively small crystallites with random orientation having improved impact strength are formed.

REFERENCES:
patent: 3255036 (1966-06-01), Kramer et al.
patent: 3450804 (1969-06-01), Bocckino et al.
patent: 3795504 (1974-03-01), Wengeler
patent: 3836611 (1974-09-01), Marrovic
patent: 4076773 (1978-02-01), Mahl, Jr. et al.

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