Prediction of phase equilibria in water/alcohol/alkane systems

The Cubic Plus Association Equation of State (CPA EoS) is applied to the pr ediction of Vapor-Liquid Equilibrium (VLE) and Liquid-Liquid Equilibrium (L LE) in ternary associating mixtures containing water, alcohols and alkanes. The appropriate set of combining rules for the cross-association energy an d volume parameters of the EoS is identified by evaluating the performance of four such sets in the correlation of VLE and LLE for water/alcohol mixtu res. Using only one interaction parameter per binary mixture, in the physic al part of the EoS, CPA gives very satisfactory predictions of ternary VLE and LLE. (C) 1999 Elsevier Science B.V. All rights reserved.