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:
Dec. 31, 1985
Filed:
Jul. 09, 1984
Applicant:
Inventors:
George D Grab, Bethlehem, PA (US);
Sheldon W Dean, Allentown, PA (US);
Assignee:
Air Products and Chemicals, Inc., Allentown, PA (US);
Primary Examiner:
Int. Cl.
CPC ...
C01B / ; C01B / ; C01B / ;
U.S. Cl.
CPC ...
423235 ; 423390 ; 423393 ; 423394 ;
Abstract
The present invention involves a process for removing nitrogen oxides from an off gas stream, such as nitric acid plant tail gas. The off gas is scrubbed with concentrated nitric acid to remove nitrogen oxides to a concentration below about 200 ppm. The nitric acid used in the scrubbing step is subsequently stripped of recovered nitrogen oxides which can be recycled back to a nitric acid plant. The oxidized nitric acid is recovered as concentrated nitric acid which can be used in the initial scrubbing step and/or recovered as product.