METHOD OF EXHAUST GASSES PURIFICATION FROM AMMONIA Russian patent published in 1996 - IPC

FIELD: method of exhaust gasses purification form ammonia is used in production of ammonium nitrate, boron nitride and another branches of chemical industry. SUBSTANCE: exhaust gasses with ammonia impurity in presence of oxygen are passed through three cataleptic layers. Catalyst for ammonia oxidation is located in the middle and catalyst for formed nitrogen oxides reduction is located on both sides. Direction of purified gasses movement is periodically changed for opposite. Volumetric ratio of middle sides layers is from 1 : 0.02 to 1 : 50. In advantageous version part of purified gas (no more than 50 % of volume) is fed on last catalytic layer omitting middle layer or it is fed between catalytic layers. EFFECT: improved process. 3 cl, 3 dwg, 1 tbl