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:
Apr. 06, 2010
Filed:
Feb. 15, 2007
Markus Dugal, Kempen, DE;
Franz-ulrich Von Gehlen, Krefeld, DE;
Stefan Wershofen, Mönchengladbach, DE;
Andre Lago, Shanghai, CN;
Peter Lehner, Ratingen, DE;
Benie Marotz, Düsseldorf, DE;
Markus Dugal, Kempen, DE;
Franz-Ulrich Von Gehlen, Krefeld, DE;
Stefan Wershofen, Mönchengladbach, DE;
Andre Lago, Shanghai, CN;
Peter Lehner, Ratingen, DE;
Benie Marotz, Düsseldorf, DE;
Bayer MaterialScience AG, Leverkusen, DE;
Abstract
Crude aniline is produced by hydrogenating nitrobenzene in the presence of a catalyst. This crude aniline is then purified by means of a single-step or multi-step distillation process in which aqueous alkali metal hydroxide solution is added to the crude aniline prior to distillation and/or during distillation of the crude aniline.