Zimmermann and al. (1995) have proposed a model for the simulation of a multi-component extraction process based on Maxwell-Stefan approach and incorporating a drop population model. In the continuation of this work, this paper presents some recent developments, notably the extension to the dynamic and some improvements at the hydrodynamic level. The model is characterised by the coupling of two main aspects in separation processes : hydrodynamics and multi-component mass transfer. Hydrodynamics is described by a drop population model : fundamental mechanisms like transport, axial back-mixing and forward-mixing, drop breakage and interdrop coalescence, including Marangoni effect, are described in a detailed way. Multi-component mass transfer is computed using the Maxwell-Stefan approach. The proposed model is able to predict the component concentration profiles in the dispersed and continuous phases, hold-up and drop size distribution throughout the column and the interactions between mass transfer and hydrodynamics under operating conditions up to flooding.