Abstract: Mass transfer experiments have been carried out in a 40mm diameter pulsed extraction column equipped with standard and "dispersion-coalescence" type cartridges; respectively. A system with 30% TBP (kerosene as diluent)/ HNO3/H2O was used. "True" volumetric mass transfer coefficient and back- m ixing parameters in continuous and dispersed phases were simultaneously evaluated from the steady state concentration profiles in both phases using a computer program based on the backflow model. Drop sizes and dispersed phase hold-up in the column were measured at the same time. Overall mass transfer coefficients were then calculated. It was shown that the mass transfer charicteristics of the extraction column can be predicted by the single turbulent circulating drop mass transfer mechanism.