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. 27, 2021
Filed:
Jun. 01, 2015
Thyssenkrupp Industrial Solutions Ag, Essen, DE;
Thyssenkrupp Ag, Essen, DE;
Christian Perbandt, Dortmund, DE;
thyssenkrupp Industrial Solutions AG, Essen, DE;
thyssenkrupp AG, Essen, DE;
Abstract
A method of reducing NOin tail gas obtained during startup of a plant for preparing nitric acid may involve heating the tail gas from a starting temperature T, through a threshold temperature T, to an operating temperature Tat which steady-state operation of the plant can occur (T<T<T). NO-containing tail gas may be passed through a storage medium and at least partially stored while the temperature of the tail gas is lower than the threshold temperature T. The NOmay be released, preferably when the temperature of the tail gas has attained the threshold temperature T. The NOmay be combined with a reducing agent in the presence of an SCR catalyst after the temperature of the tail gas has exceeded the threshold temperature T, but not before, resulting in catalytic reduction of at least a portion of the NO.