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:
May. 24, 2016
Filed:
Jun. 10, 2014
Bayer Materialscience Llc, Pittsburgh, PA (US);
Bayer Materialscience Ag, Leverkusen, DE;
Bernd Pennemann, Bergisch Gladbach, DE;
Ulrich Westphal, Leverkusen, DE;
Dieter Foertsch, Leichlingen, DE;
Spotswood Miller, Friendswood, TX (US);
Covestro LLC, Pittsburgh, PA (US);
Covestro Deutschland AG, Leverkusen, DE;
Abstract
The invention relates to a method for reducing the concentration of nitrogen oxides in waste gases released dating the production of organic amino compounds, wherein an organic compound is first reacted with NOand/or nitric acid to form an organic nitro compound with the formation of an NO-containing waste gas stream and the organic nitro compound is converted to the organic ammo compound by means of hydrogen-containing reaction gas, the reaction of the organic nitro compound with the hydrogen-containing reduction gas taking place with the formation of a hydrogen-containing waste gas stream, the method being characterised in that the NO-containing waste gas stream is combined with the hydrogen-containing waste gas stream and/or an externally supplied hydrogen stream and is reacted at a temperature of 800 to 1700° C. for the at least partial reduction of the NOconcentration. The invention additionally relates to an apparatus for carrying out the method.