Experimental and theoretical studies on modelling of breakthrough times of adsorbent beds composed of activated carbon Sorbonorit 3 and iron granular mixture with volumetric fraction. of iron 0, 0.1, 0.2 and 0.3 in adsorption step of butan-l-ol vapour from air stream in inductive ETSA process, were presented. A developed theoretical model was based on modification of the Klotz equation.