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:
Jan. 06, 2015
Filed:
May. 03, 2012
Applicants:
Lino Carlessi, Dalmine, IT;
Alessandro Gianazza, Legnano, IT;
Inventors:
Lino Carlessi, Dalmine, IT;
Alessandro Gianazza, Legnano, IT;
Assignee:
Salpem, S.p.A., San Donato Milanese (MI), IT;
Primary Examiner:
Int. Cl.
CPC ...
C07C 273/04 (2006.01); C07C 213/04 (2006.01);
U.S. Cl.
CPC ...
C07C 273/04 (2013.01); C07C 213/04 (2013.01); B01J 2219/00024 (2013.01); B01J 2219/00006 (2013.01);
Abstract
A process for the direct synthesis of urea from ammonia and carbon dioxide at high pressures and temperatures, with the formation of ammonium carbamate as intermediate, comprising a decomposition step of the ammonium carbamate and stripping of the gases formed, operating substantially at the same pressure as the synthesis step, wherein the recycled liquid streams are fed, at least partially, to the same decomposition and stripping step after being preheated by heat exchange with a stream included in the high-pressure synthesis cycle.