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:
Apr. 25, 2017
Filed:
Dec. 13, 2010
Applicants:
Ruediger Fritz, Bernsdorf, DE;
Renate Hempel, Ruhland, DE;
Michael Zoellinger, Eislingen, DE;
Holger Allardt, Schwarzheide, DE;
Reiner Reetz, Schwarzheide, DE;
Inventors:
Ruediger Fritz, Bernsdorf, DE;
Renate Hempel, Ruhland, DE;
Michael Zoellinger, Eislingen, DE;
Holger Allardt, Schwarzheide, DE;
Reiner Reetz, Schwarzheide, DE;
Assignee:
BASF SE, Ludwigshafen, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C02F 1/66 (2006.01); C02F 9/00 (2006.01); C01B 21/40 (2006.01); C07C 201/08 (2006.01); C02F 1/20 (2006.01); C02F 1/78 (2006.01); C02F 103/36 (2006.01);
U.S. Cl.
CPC ...
C02F 9/00 (2013.01); C01B 21/40 (2013.01); C07C 201/08 (2013.01); C02F 1/20 (2013.01); C02F 1/78 (2013.01); C02F 2103/36 (2013.01); C02F 2209/008 (2013.01); C02F 2209/02 (2013.01); C02F 2209/06 (2013.01);
Abstract
The present invention relates to a process for workup of nitrite-comprising alkaline process wastewaters from the nitration of aromatic compounds, wherein the alkaline process wastewater is acidified by addition of acids and the offgas which comprises nitrogen oxides and escapes from the acidified process wastewater is worked up, comprising the steps of