Nonideal Phenomena in Countercurrent Distribution

Abstract

An equation is presented that predicts the number of inputs required to produce a step-function (frontal) output in countercurrent distribution (CCD). When a portion of both phases is transported during experiments, the published equations for CCD are inappropriate. Expressions have been derived that predict the properties of elution and frontal outputs when biphasic flow occurs. When phase volumes and partition coefficients vary during the course of the distribution, computer simulation of the process, using the appropriate ternary phase diagram becomes necessary for adequate prediction of solute profiles. Shifts in position, shape, and height of frontal outputs and the nature of excess lower phase in the effluent are predicted and compare well with experimental results.