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. 30, 2005
Filed:
Jun. 28, 2004
Applicants:
Jürgen Münnig, Kaarst, DE;
Dietmar Wastian, Dormagen, DE;
Wolfgang Lorenz, Dormagen, DE;
Berthold Keggenhoff, Krefeld, DE;
Inventors:
Jürgen Münnig, Kaarst, DE;
Dietmar Wastian, Dormagen, DE;
Wolfgang Lorenz, Dormagen, DE;
Berthold Keggenhoff, Krefeld, DE;
Assignee:
Bayer MaterialScience AG, Leverkusen, DE;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07C205/00 ;
U.S. Cl.
CPC ...
Abstract
The present invention relates to a process for working up or treating aqueous waste waters which are formed during the nitration of toluene to dinitrotoluene with nitrating acid. These aqueous waste waters containing acidic wash water and alkaline wash water from the dinitrotoluene washing step, and distillate from the sulfuric acid concentration step. The process comprises,