Absorption removal of acetone and methanol from N-2 gas streams with liquid silicone oil was investigated in microporous hollow fiber modules. The gas flowed into the tube and silicone oil was flowed in the shell. Inlet concentrations of acetone and methanol were 1600 and 500 ppmv, respectively. All experiments were performed as a function of gas linear velocity (2.1 - 10.4 cm/sec), liquid linear velocity (0.6-5.8 cm/sec), and the operation time (10-60 min). The overall mass-transfer coefficients based on the gas phase were calculated and compared with the experimental results. The mass transfer mechanism was discussed and the height of a transfer unit in this device was finally determined.