Abstract
This chapter discusses the discontinuous systems in the counter current distribution (CDD). Chromatographic methods have made possible in the last fifty years the separation of complex mixtures both on an analytical and a preparative scale. Column chromatography based on absorption uses a solid stationary phase, whereas in that based on partition between two liquid phases the liquid stationary phase is supported on a solid. In both cases the solid - solute interaction may cause irreversible absorption and/or chemical modifications of the components of the mixture submitted to separation. Moreover the technique requires along time and displays a relatively low resolution power. These disadvantages do not occur if the separation is performed by two-phase systems in counter current processes. This chapter presents the survey of two particular aspects of the CCD which have been applied successfully during the last fifteen years to the preparative separation of ionic and neutral substances from many complex mixtures, generally plant extracts, using a Post-model Craig apparatus.
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