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:
Dec. 25, 2007
Filed:
Nov. 14, 2002
Applicants:
Frank Schröder, Albrechtshain, DE;
Hartmut Bucka, Eggendorf, AT;
Christoph Neumüller, Linz, AT;
Gerhard Coufal, Leonding, AT;
Inventors:
Frank Schröder, Albrechtshain, DE;
Hartmut Bucka, Eggendorf, AT;
Christoph Neumüller, Linz, AT;
Gerhard Coufal, Leonding, AT;
Assignee:
Ami - Agrolinz Melamine International GmbH, Linz, AT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D 251/60 (2006.01); C07D 251/62 (2006.01); C07D 55/24 (2006.01); B01D 47/00 (2006.01); B01D 53/14 (2006.01); C07F 3/00 (2006.01); C08G 79/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A two-stage process is provided for purifying off-gases from a high-pressure melamine plant. In the first stage, the off-gases are contacted with a recirculated urea melt containing melamine precursors and NH. In the second stage, the off-gases are contacted with a fresh urea melt.