The flow-mass transfer characteristics of a new countercurrent gas-liquid scrubber were investigated through cold model experiment. The results indicated that different gas-liquid flow patterns in the scrubber could be obtained under different operating conditions. Both the volume of the highly efficient mass-transfer and the desorption rate under the bubble flow presented the higher values comparing with those under other two flow patterns. Combining the experimental results with theoretical analysis

a two-zone flow-mass transfer model which can estimate the mass-transfer of the scrubber was established based on its characteristics of rapid renewal on gas-liquid surface and highly turbulent bubble flow. The structural/operating features of the scrubber were also considered. The proposed model divided the whole gas-liquid impinging area into two zones

including the rotating jet-flow zone and the high-efficiency mass-transfer zone. Then the relationships of desorption rate to L/G as well as ω were discussed by using the model. The computed results by this model match well with the experimental under different operating conditions and it can be used for engineering design purpose.