Patent · US Expired

Method for the removal of Nox and N2O from the tail gas in nitric acid production

US7485276B2 · kind B2 · utility

5Cited by

6References

22Claims

0Family size

Assignee

UHDE GMBH · DE

Inventors

Meinhard Schwefer · Meschede, DE
Rainer Maurer · Schwelm, DE
Thomas Turek · Boston, US
Markus Kögel · Lichtenfels, DE

Key dates

Filing date	Jan 9, 2001
Grant date	Feb 3, 2009
Priority date	—
Expiry date	Jan 9, 2021

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P20/151
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A process is described for reducing the NOx concentration and N2O concentration from the residual gas from nitric acid production. The process encompasses the passing of the residual gas leaving the absorption column, prior to entry into the residual gas turbine, through a combination of two stages. The first stage here reduces the NOx content and the second stage the N2O content of the gas, the NOx/N2O ratio prior to entry of the gas into the second stage being in the range from 0.001 to 0.5, and this gas being brought into contact in the second stage with a catalyst which is substantially composed of one or more iron-loaded zeolites.

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