lates the vapor-liquid equilibrium and liquid-liquid equilibrium of mixedsolvent electrolyte systems over the entire range of temperature and concentrations.Correlation of experimental data for 47 single-solvent electrolyte systems and 33 mixed-solvent electrolyte systems demonstrates that the electrolyte NRTL model gives excellent representation of vapor-liquid equilibrium and liquid-liquid equilibrium of mixed-sol-vent electrolyte systems. Average errors of AP = 1 kPa, AT = 0.1 K, Ay = 0.01 in correlating vapor-liquid equilibrium data at atmospheric conditions, and Ax = 0.01 in correlating liquid-liquid equilibrium data are typical. Previous MethodsIn the late 1960's and the 1970's, several semiempirical models for representing the excess Gibbs energy of nonelectrolyte liquid solutions were developed with the local composition concept. Examples are the Wilson (1964) model, the NRTL model (Renon and Prausnitz, 1968), and the UNIQUAC model (Abrams and Prausnitz, 1975). These models are able to represent, with a reasonable number of binary adjustable parameters, the phase equilibrium of highly nonideal nonelectrolyte systems. Parameter RequirementsThe model binary adjustable parameters are associated with the solvent-solvent pairs, solvent-salt pairs, and salt-salt pairs.
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