Thermophysical property predictions from the software package EOSMIX

A two-fluid corresponding-states model for predicting the thermodynamic properties of mixtures has been developed, which uses accurate equations of state for the reference substances of the components. A new mixing parameter has been introduced, which takes account of the differences in molecular sizes in binary fluid mixtures. The three mixing parameters for methane-ethane and methane-propane have been optimized using different types of experimental data. Comparisons of predictions with data are given for experimental densities and speed of sound.