FIELD: gas scrubbing. SUBSTANCE: gas exhaust is treated by chlorine-containing oxidant. Industrial gases containing chlorine (mainly exhaust gases of platinum metal concentrate) are used as oxidant. Ratio NO:Cl2 is 1: (0.45-0.50). Then gas exhaust is contacted with aqueous NaOH. Thus prepared solution containing NaOH, NaNO3 and NaNO2 may be used in main process. Purification degree against NOx is 92.5% . EFFECT: improves efficiency of the method.
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