| US 7,582,237 B2 | ||
| Process for preparing granular urea product | ||
| Eiji Sakata, Chiba (Japan); Genshi Nishikawa, Chiba (Japan); and Haruyuki Morikawa, Chiba (Japan) | ||
| Assigned to Toyo Engineering Corporation, Tokyo (Japan) | ||
| Filed on Jul. 11, 2006, as Appl. No. 11/484,167. | ||
| Claims priority of application No. 2005-203811 (JP), filed on Jul. 13, 2005. | ||
| Prior Publication US 2007/0013092 A1, Jan. 18, 2007 | ||
| Int. Cl. C05C 9/00 (2006.01); B29B 9/00 (2006.01) | ||
| U.S. Cl. 264—7 [23/313 FB; 71/28; 264/14] | 4 Claims |
| 1. A process for preparing a granular urea product having a moisture content of no more than 0.3 wt. %, comprising the steps
of:
employing a fluidized and spouting bed method in a granulator in which an air-supplying pipe injects air into a granulated
product in the granulator to form both a fluidized bed and a spouting bed;
ejecting an aqueous urea solution having a urea concentration of 94-98.5 wt. % into the granulator from a nozzle arranged
at the center of the pipe;
supplying air for fluidization to the fluidized and spouting bed through a porous plate; and
performing granulation at an operational temperature of from 115-120° C. in the fluidized and spouting bed to accelerate drying
of a granulated product.
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