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. 26, 2021
Filed:
Aug. 02, 2017
Thyssenkrupp Uhde Gmbh, Dortmund, DE;
Meinhard Schwefer, Meschede, DE;
Rolf Siefert, Rheda-Wiedenbrück, DE;
Jürgen Fuchs, Dortmund, DE;
Klaus Ruthardt, Dortmund, DE;
Michael Groves, Gevelsberg, DE;
THYSSENKRUPP INDUSTRIAL SOLUTIONS AG, Essen, DE;
Abstract
An apparatus is provided for treatment of process gas formed during nitric acid production by catalytic oxidation of NH. The apparatus includes a reactor, a first catalyst bed for NO decomposition, an absorption tower to react the NOformed with an absorption medium downstream of the first catalyst bed, a device for adding NHadded to tailgas entering the second catalyst bed, and a second catalyst bed for NOreduction and further decrease in NO in the tailgas exiting the absorption tower. The second catalyst bed contains at least one iron-loaded zeolite catalyst. NO removal in the first catalyst bed is limited such that the process gas exiting the first catalyst bed exhibits a NO content of >100 ppmv and a molar NO/NOratio of >0.25. Treated gas exiting the second catalyst bed has a NOconcentration of <40 ppmv and a NO concentration of <200 ppmv.