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:
Feb. 24, 2009
Filed:
Jul. 12, 2007
Fritz Pohl, Brunsbüttel, DE;
Wolfgang Lorenz, Dormagen, DE;
Juergen Muennig, Shanghai, CN;
Bernd Pennemann, Bergisch Gladbach, DE;
Gerhard Wiechers, Leverkusen, DE;
Fritz Pohl, Brunsbüttel, DE;
Wolfgang Lorenz, Dormagen, DE;
Juergen Muennig, Shanghai, CN;
Bernd Pennemann, Bergisch Gladbach, DE;
Gerhard Wiechers, Leverkusen, DE;
Bayer MaterialScience AG, Leverkusen, DE;
Abstract
Dinitrotoluene is produced by nitration of toluene with nitrating acid (mixture of nitric acid and sulfuric acid) in which, in a first stage, the toluene is converted to mononitrotoluene (MNT) and then the mononitrotoluene is converted in a second stage to dinitrotoluene (DNT). Control of the weight ratio of the aqueous to organic phases, dispersion of the organic phase in the aqueous phase and use of less than 2.06 moles of nitric acid per mole of toluene are key features of this process.