Verfahren zur Entfernung von Stickoxyd aus Industriegasen,insbesondere Crackgasen

摘要

Nitric oxide is removed from industrial gases, more particularly from gases formed in the cracking of hydrocarbons, by absorption in an aqueous solution containing at least one ferrous salt, at least one ammonia salt and free ammonia, under conditions such that the nitric oxide, which is usually present in the cracking gases in an amount of 50 to 200 p.p.m., is either totally removed or reduced to less than 0.5 to 1.0 p.p.m., in a single stage or step.