Abstract
Residence-time distribution of the dispersed phase has been investigated in a 150-mm-diameter Wirz-II agitated extraction column for six different liquid-liquid systems of medium to low interfacial tension and small density difference, using a two-point transient tracer technique. The flow of the dispersed phase is described by a convective model, and drop velocities and constriction factors are calculated from measured residence-time curves and drop-sizes distributions. For design purposes, an empirical correlation is presented for the average constriction factor in terms of the agitator speed and density difference between the phases
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