VERFAHREN ZUR NO-RUECKGEWINNUNG AUS DEM BEI DER AMMONIUMNITRITHERSTELLUNG ANFALLENDEN ABGAS.

摘要

In NO recovery from ammonium nitrite prodn. off. gas by absorption in ammonium (hydrogen) carbonate soln. to form an ammonium nitrite soln. and absorption of the resulting CO2 -contg. gas in aq. ammoniacal soln. to form ammonium (hydrogen) carbonate which is recycled to the first absorption stage, the novelty is that the CO2 -contg. gas is contacted with a medium concn. sulphuric acid soln. contg. 0.1-5 (pref. 0.2-1.5) wt. % nitric acid prior to the second absorption stage.