The generation of centrifugal or high gravitation fields in rotating packed beds (RPB) can so intensify vapor-liquid mass transfer processes that the height of a transfer unit (HTU) can be reduced as much as 1 ～ 2 order(s) of magnitude. Previous workers explain this interesting phenomenon from the view that both k_1 and a_e/a_p are proportional to gravitation acceleration raised to certain positive powers. Almost all these explanations are based on the assumption that liquid flows in a film over the packing. The liquid exiting from a rotor is highly atomized, a condition that may exist in a RPB, and the contribution of these droplets to the overall mass transfer rate may be considerable and should not be ignored in the mass transfer processes in RPB. The objective of this work is to determine experimentally the mass transfer coefficients, and a model, considering the contribution of droplet~(**) mass transfer in RPB, is established.
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