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:
Aug. 18, 2009
Filed:
May. 26, 2005
Applicants:
Friedhelm Steffens, Leverkusen, DE;
Rainer Buse, Köln, DE;
Bill Brady, Düsseldorf, DE;
Inventors:
Assignee:
Bayer MaterialScience AG, Leverkusen, DE;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B01D 3/00 (2006.01); C07C 51/44 (2006.01); C07C 209/84 (2006.01); C07C 209/86 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention relates to an energy efficient process for the distillative working-up of aqueous amine solutions that occur in the catalytic hydrogenation of nitroaromatic compounds. In this process, the amine is freed from water and also the water is obtained free from amine and low-boiling compounds and the concentrated low-boiling compounds are obtained.