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:
Aug. 21, 2007
Filed:
Feb. 15, 2003
Frank Dziobek, Muehlheim/Ruhr, DE;
Detlev Claes, Bochum, DE;
Joachim Johanning, Oberhausen, DE;
Rainer Maurer, Schwelm, DE;
Erich Szonn, Witten, DE;
Frank Dziobek, Muehlheim/Ruhr, DE;
Detlev Claes, Bochum, DE;
Joachim Johanning, Oberhausen, DE;
Rainer Maurer, Schwelm, DE;
Erich Szonn, Witten, DE;
UHDE GmbH, Dortmund, DE;
Abstract
The invention relates to a method for the production of nitric acid having a concentration of between 50 and 76%, from ammonia and gas containing oxygen, under pressure, according to a single pressure method or dual pressure method. The expansion of the residual gas takes place in at least two stages in a work efficient manner. At least one device for heating the previously expanded gas to a temperature of more than 450° is disposed between every other expansion stage, using waste heat from the production process of nitric acid.