Hydrazine vapor is hazardous and should be removed from air. Several methods have been suggested for this purpose. Gas absorption by a packed-bed column (PBC) is a conventional method. Due to some disadvantages of the PBC, the wetted-wire column (WWC) was introduced as a new contact device. In this paper, the performance of the WWC was studied and compared with the PBC under the same conditions of gas and liquid volume flow rates. The ranges of the gas and liquid flow rates were 0-100 L min(-1) and 0-2.5 L min(-1), respectively. The results showed that the pressure drop in the WWC was much smaller than in the PBC. Moreover, the removal efficiency of hydrazine from air is quite comparable in the WWC and the PBC.