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:
Sep. 22, 2020
Filed:
Dec. 09, 2016
Applicant:
Casale SA, Lugano, CH;
Inventor:
Luca Rugnone, Como, IT;
Assignee:
Casale SA, Lugano, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 273/04 (2006.01); B01D 3/04 (2006.01); C07C 273/16 (2006.01); B01D 1/06 (2006.01); B01D 3/00 (2006.01);
U.S. Cl.
CPC ...
C07C 273/04 (2013.01); B01D 1/065 (2013.01); B01D 3/009 (2013.01); B01D 3/04 (2013.01); C07C 273/16 (2013.01); Y02P 20/127 (2015.11);
Abstract
A shell-and-tube stripper for carbamate decomposition and ammonia recovery from a urea solution comprising a bundle of heated tubes, said tubes being fed with said urea solution and carbon dioxide as stripping medium, the urea solutions forming a liquid falling film on the internal surface of the tubes and the carbon dioxide forming a counter-current gaseous flow; said tubes comprise an external layer made of super austenitic or super duplex stainless steel and an internal layer made of zirconium, said internal layer reaching temperatures higher than 220° C.