Vapor-liquid equilibria of binary associating fluids using a cubic equation of state with limited data

The vapor-liquid equilibria of binary associating fluids containing alcohols are described using a cubic equation of state, van der Waals mixing rules, and a binary interaction parameter. The binary interaction parameter is a linear function of composition. The binary interaction parameter is also a strong function of temperature. The temperature dependency was derived by combining van der Waals mixing rules with G^E mixing rules followed by approaching infinite dilution limiting condition. Employing pure component parameters with literature values of infinite dilution activity coefficients, the vapor-liquid equilibria of systems containing alcohols were predicted satisfactorily. In the absence of experimental or estimated infinite dilution activity coefficients, the model can be coupled with the nonrandom two-liquid activity coefficient model to accurately correlate experimental vapor-liquid equilibrium data.