Patent · US Expired

Method for the production of nitric acid

US7258849B2 · kind B2 · utility

3Cited by

11References

5Claims

0Family size

Assignee

UHDE GMBH · DE

Inventors

Frank Dziobek · Neheim, DE
Detlev Claes · Bochum, DE
Joachim Johanning · Oberhausen, DE
Rainer Maurer · Schwelm, DE
Erich Szonn · Witten, DE

Key dates

Filing date	Feb 15, 2003
Grant date	Aug 21, 2007
Priority date	—
Expiry date	Nov 24, 2023

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P20/129
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.