REMOVAL OF AMMONIA NITROGEN, AMMONIUM NITROGEN AND UREA NITROGEN BY OXIDATION WITH HYPOCHLORITE-CONTAINING SOLUTIONS FROM EXHAUST AIR IN PLANTS FOR PRODUCING AMMONIA AND UREA

摘要

Process for scrubbing out ammonianitrogen and/or ammonium nitrogen and/or urea nitrogenfrom exhaust gases enriched with these nitrogencompounds in plants for producing ammoniaor urea, wherein the nitrogen compounds first formwith a hypochlorite-containing solution in a scrubberan intermediate which under acidic or neutralreaction conditions is reacted to form elemental nitrogenand salt, and the reaction of the nitrogencompounds to form elemental nitrogen and salt proceedsin a pH range of 4 to 6.