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:
Nov. 21, 2000
Filed:
Mar. 16, 1995
Applicant:
Inventors:
Giorgio Pagani, Milan, IT;
Umberto Zardi, Breganzona, CH;
Assignee:
Urea Casale, S.A., Lugano-Besso, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
564 67 ; 564 70 ; 564 72 ;
Abstract
An improved process for urea production as well as a method of retrofitting a pre-existing urea plant based on the Stamicarbon process are disclosed. According to the invention, a high yield reaction space fed by highly pure reagents (NH3 and CO2) and a separating section of the solution leaving the high yield reaction space are added to the pre-existing urea plant, means being provided for recirculating ammonia and carbammate solutions obtained in the separating section to the added high yield reaction space and to the pre-existing reactor respectively.