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:
Jan. 28, 2014
Filed:
Jan. 31, 2012
Holger Allardt, Schwarzheide, DE;
Andreas Raichle, Ludwigshafen, DE;
Reiner Reetz, Schwarzheide, DE;
Johannes Büttner, Ruhland, DE;
Michael Zöllinger, Eislingen, DE;
Stefanie Haase, Bretnig-Hauswalde, DE;
Rüdiger Fritz, Bernsdorf, DE;
Holger Allardt, Schwarzheide, DE;
Andreas Raichle, Ludwigshafen, DE;
Reiner Reetz, Schwarzheide, DE;
Johannes Büttner, Ruhland, DE;
Michael Zöllinger, Eislingen, DE;
Stefanie Haase, Bretnig-Hauswalde, DE;
Rüdiger Fritz, Bernsdorf, DE;
BASF SE, Ludwigshafen, DE;
Abstract
Precipitations of nitrohydroxyaromatic salts out of the nitrated crude products obtained in the nitration of aromatic compounds after alkaline scrubbing, for example mononitrotoluenes, are prevented by contacting the nitrated crude products with an acidic ion exchanger. The nitrated crude products are preferably selected from a feedstream to a distillation column, a bottoms circulation stream of a distillation column and a feedstream to a vaporizer.