Abstract
Based on a rigorous solution derived by the quasichemical approximation to the lattice-hole statistical−mechanical theory, a unified group contribution equation of state was formulated. The model was found to be quantitatively applicable for the calculation and prediction of thermodynamic properties of real pure fluids and mixtures in general. The approach requires segment size and interaction energy parameter from functional group characteristics. The unique feature of the method is that a single set of temperature-dependent group parameters are used for both pure fluids and mixtures. The group parameters were determined and tabulated for various functional groups. Its applicability was demonstrated for vapor pressures, binodals, and critical properties of pure fluids including polymeric substances and phase-equilibrium properties of mixtures.
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