The Group Contribution Equation of State (GC-EOS) is applied to calculate v
apor-liquid and liquid-liquid equilibria of supercritical alkane-vegetable
oil mixtures. A new functional group is defined, in order to represent the
triglyceride nucleus of vegetable oil molecules. Pure group and binary inte
raction parameters for this group are given. The size of the high molecular
weight triglyceride component is characterized by fitting its critical har
d sphere diameter to infinite dilution activity coefficient data of hydroca
rbons in the triglyceride. (C) 1999 Elsevier Science B.V. All rights reserv
ed.