Abstract Mixing rules are established for the Trebble-Bishnoi equation of state which are quadratic in form. Vapour—liquid data for thirty-three binary systems were used to evaluate the extension of the equation to fluid mixtures. As many as four interaction parameters were used to fit the binary data, however good correlation was often obtained with only one interaction parameter. Several isotherms were included for each binary system and many chemical types were included in the list of components evaluated. Extensive volumetric data for the binary system of carbon-dioxide and propane were compared to specific volumes calculated from the Trebble-Bishnoi equation in order to evaluate the accuracy of mixture density predictions. A ternary system of acetone—methanol—water was predicted very accurately using interaction parameters regressed from binary vapour—liquid equilibrium data alone. All of the results compared very favourably to results from both the Peng-Robinson and the Soave-Redlich-Kwong equations of state.
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