The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 28, 1983
Filed:
Mar. 27, 1981
Applicant:
Inventors:
Michael H Willems, Geleen, NL;
Jan W Klok, Geleen, NL;
Assignee:
Unie Van Kunstmestfabrieken, B.V., Utrecht, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01J / ;
U.S. Cl.
CPC ...
264-7 ; 264 14 ; 264-8 ;
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.