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:
Oct. 11, 2005
Filed:
Jun. 28, 2004
Jürgen Münnig, Kaarst, DE;
Dietmar Wastian, Dormagen, DE;
Wolfgang Lorenz, Dormagen, DE;
Berthold Keggenhoff, Krefeld, DE;
Jürgen Münnig, Kaarst, DE;
Dietmar Wastian, Dormagen, DE;
Wolfgang Lorenz, Dormagen, DE;
Berthold Keggenhoff, Krefeld, DE;
Bayer MaterialScience AG, Leverkusen, DE;
Abstract
The present invention relates to a process for working up organic secondary components which are formed in the one-stage or two-stage nitration of toluene to dinitrotoluene. These organic secondary components are present in the acidic and alkaline waste water from the dinitrotoluene washing step and in the aqueous distillate from the sulfuric acid concentration step, together with small amounts of mononitrotoluene and dinitrotoluene. This process comprises