VAPOR-LIQUID-EQUILIBRIUM FOR SYSTEMS THAT CONTAIN MORE THAN ONE ALCOHOL - COMPARISON OF KRETSCHMER-WIEBE AND MOBILE ORDER MODELS

As part of a continuing study of associated mixtures, we compare the a bilities of two solution models to represent vapor-liquid equilibria f or binary mixtures of alcohols. Specifically, we compare mobile order theory, in which the degree of association is governed by the fraction of time for which a molecule is free of hydrogen bonding, to the Kret schmer-Wiebe model, in which hydrogen bonding is modelled classically by chemical equilibria. Both models contain parameters which reflect p hysical interactions, self-association and cross-association and both contain the same number of adjustable parameters. In addition to compa ring the abilities of each model to represent VLE data, we examine the temperature dependence of the model parameters. (C) 1998 Elsevier Sci ence B.V. All rights reserved.