PROCESS FOR PRODUCING NITRIC ACID Russian patent published in 1995 - IPC

FIELD: processes for producing nitric acid. SUBSTANCE: the hot gas mixture containing nitrogen monoxide is kept for 0.1-3 s till it becomes cool. Because of this fact about 90% nitrogen monoxide decomposes to nitrogen and oxygen. The hot mixture that results form catalytic combustion of ammonia till it becomes cool in a heat utilization plant is kept for 0.5-2s. Gaseous combustion products may be made to cohtact with a metal or metal oxide-based for catalyst the selective decomposition of nitrogen monoxide. EFFECT: lower content of nitrogen oxides in gas mixtures.