The coal gas of hydrogen sulphide (H2S) containing carbon dioxide (CO2) is absorbed by alkaline solution in industry. A large number of CO2 absorption will cause high alkali consumption, side reactions and larger regeneration system. The effect of high gravity factor, liquid-gas ratio, Na2CO3 concentration and gas-liquid contact time at the desulfurization rate and selectivity in RPB is investigated in experiment. At the same time, selective desulfurization experiment is compared RPB and packed columns. The results show that the desulfurization rate is 95% and the selectivity is 40 under the condition of high gravity of 95, a liquid-gas ratio of 19L·m-3, Na2CO3 concentration of 12g·L-1 and gas-liquid contact time of 0.1s in RPB. It can achieve high selective absorption of H2S and a small amount of CO2 absorption in RPB, but the selective absorption in the tower packed is poor.