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:
Mar. 31, 2009
Filed:
Dec. 13, 2007
Fritz Pohl, Brunsbüttel, DE;
Wolfgang Lorenz, Dormagen, DE;
Lars Padeken, Düsseldorf, DE;
Bernd Pennemann, Bergisch Gladbach, DE;
Friedhelm Steffens, Leverkusen, DE;
Gerhard Wiechers, Leverkusen, DE;
Fritz Pohl, Brunsbüttel, DE;
Wolfgang Lorenz, Dormagen, DE;
Lars Padeken, Düsseldorf, DE;
Bernd Pennemann, Bergisch Gladbach, DE;
Friedhelm Steffens, Leverkusen, DE;
Gerhard Wiechers, Leverkusen, DE;
Bayer MaterialScience AG, Leverkusen, DE;
Abstract
The present invention relates to a process for the preparation of toluenediamine, in which dinitrotoluene is reacted with hydrogen in the presence of a catalyst. The dinitrotoluene required by this process has a content of carbon dioxide, in either physically dissolved or chemically bonded form, of not more than 0.175 mol %, based on the molar amount of the dinitrotoluene.