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:
Jul. 01, 2014
Filed:
Jul. 08, 2008
Heinz-josef Kneuper, Niederkirchen, DE;
Jan-martin Loening, Freinsheim, DE;
Stephanie Mollner, Mannheim, DE;
Joerg Torsten Nickel, Karlsruhe, DE;
Heinz-Josef Kneuper, Niederkirchen, DE;
Jan-Martin Loening, Freinsheim, DE;
Stephanie Mollner, Mannheim, DE;
Joerg Torsten Nickel, Karlsruhe, DE;
BASF SE, Ludwigshafen, SE;
Abstract
A process for preparing nitric acid by: catalytically oxidizing ammonia, to obtain a gas mixture containing NO and O; cooling and condensing the gas mixture, thereby further oxidizing NO with O, to obtain a gas stream containing NO/NOand an aqueous solution containing nitric acid; and countercurrently absorbing the NO/NOfrom the gas stream in an absorber with process water (HO), to obtain nitric acid and an NO-containing absorber offgas, wherein the water content of the nitric acid is regulated to a concentration in the range from 50 to 77.8% by weight and the NOcontent of the absorber offgas to a concentration in the range from 20 to 500 ppm, by continuously measuring the water content of the process air supplied to the catalytic gas phase oxidation and, as a function of this, adjusting the amount of process water (Q-HO) fed to the absorber.