A Critical Comparison of Nrhb with Saft and Simplified Pc-Saft

Two types of statistical thermodynamic models are critically compared in this work: The Non-Random Hydrogen-Bonding (NRHB) Theory, which is a compressible lattice model, represents the first type, while the Statistical Associating Fluid Theory (SAFT) and the Simplified Perturbed-Chain-Statistical Associating Fluid Theory (sPC-SAFT), which are based on Wertheim's perturbation theory, represent the second type. A standard data base for the evaluation of vapor-liquid equilibrium (VLE) models proposed by Danner and Guess and liquid-liquid equilibrium data of carefully selected binary mixtures, such as water ? hydrocarbons, alkanols ? hydrocarbons, water ? alkanols and glycols ? hydrocarbons, were used to benchmark the accuracy of the models. The capacity of the models to, both, correlate and predict phase equilibria is discussed.