Mass transfer between two phases was studied in an agitated vessel with a flat liquid-liquid interface for 30 systems, where physical properties varied in a wide range. The observed Sherwood numbers for the first-phase Sh{ were correlated in terms of the first-phase Reynolds number Re19 modified second-phase Reynolds number Re2 \ Schmidt number Sc1 9 Capillary number Cax and a function of viscosity ratio

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A similarity analysis is applied to steady cocurrent flows with a mobile interface, and a method is suggested to calculate the velocity profiles in both phases. With this method the velocity profiles and mass transfer coefficients are numerically obtained for a simple flow system. It is shown that, approximately, SfioC]//^^-9 and that the dimensionless velocity gradient at the interface can be reasonably neglected for mass transfer calculations.