Patent ID: 6056928
Filing Date: 2000-05-02
Classification: B01D,C01B,Y02C,Y02P

Abstract:
A process for removing nitrogen oxides from a gas stream in which they are contained which comprises passing the gas stream(A) through a stage for absorbing the nitrogen oxides other than N.sub.2 O in an absorbent or reacting the nitrogen oxides other than N.sub.2 O with an absorbent, and(B) through a stage for reducing the amount of N.sub.2 O, and, after stages A and B,(C) through a stage C for reducing nitrogen oxides other than N.sub.2 O, wherein the gas stream passes first through stage A and then through stage B, and wherein steps A, B and C are carried out at essentially the same pressure level within the range of from 3 to 20 bar.