Method for the removal of No x and N 2 O from the tail gas...

Details Method for the removal of No x and N 2 O from the tail gas... Method for the removal of No x and N 2 O from the tail gas...

2001-01-09

2009-02-03

Wood, Elizabeth D (Department: 1793)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

C423S239100, C423S239200

Reexamination Certificate

active

07485276

ABSTRACT:
A process is described for reducing the NOxconcentration 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 NOxcontent 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.

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