Selective absorption of H 2 S from N 2 streams containing H 2 S and CO 2 into aqueous solutions of 2-amino-2-methyl-1-propanol was investigated in a 2.55×10 -2 m o.d. stainless steel wetted-wall column at atmospheric pressure and constant feed gas ratio. In the range of gas flow rates studied (90×10 -6 to 180×10 -6 m 3 /s), the effect of gas-phase resistance to mass transfer on the absorption of H 2 S was significant. The rates of absorption of H 2 S and the selectivity factor decreased with the increase in the contact time. For an increase in the concentration of the amine from 0.5 to 2.0 kmol/m 3 , the rates of absorption of both CO 2 and H 2 S increased, but to a larger extent for CO 2 resulting in a consequent decrease in the selectivity factor. In the temperature range of 290.5-301.5K the rates of absorption of CO 2 increased marginally with the increase in temperature while the rates of absorption of H 2 S and the selectivity factor decreased. The maximum value of the selectivity factor observed was 22.5