Correlation and prediction of mineral solubilities in the reciprocal salt system (Na+, K+)(Cl−, SO2−4)−H2O at 0–100°C

Extended UNIQUAC model for correlation and prediction of vapor–liquid–liquid–solid equilibria in aqueous salt systems containing non-electrolytes. Part B. Alcohol (ethanol, propanols, butanols)–water–salt systems

“…The thermodynamic model used in this work is the Extended UNIQUAC model described earlier by Nicolaisen et al (1993) for aqueous electrolyte systems. The model is applied here to aqueous salt systems containing non-electrolytes using the method of Thomsen et al (1996) for aqueous systems.…”

Mathematical and numerical analysis of classes of property models

“…The extended UNIQUAC model [18,19] is analyzed for activity coefficients of the solvent and ionic species in a solution at a specified T and solvent and salt composition, z -. The system has of NSOLV solvents and NC − NSOLV salt compounds.…”

“…In particular, if the structure is lower tridiagonal, the solution approach is simpler than when the structure is not lower tridiagonal, in which case, simultaneous solution (or an extra iteration-loop) is necessary. The property models analyzed in this paper are cubic equations of state [10], advanced non-cubic equations of state: CPA [11][12][13]; PC-SAFT [14,15]; and SAFT [16], models for polymer systems: GC-Flory [17]; and models for electrolyte systems: UNIQUAC-Elec: [18,19]. Finally, these aspects of property models are discussed in connection with parameter regression and in the common process engineering calculations of two-phase separations and two-phase equilibrium.…”

Protein solubility modeling

“…For this work the solid-liquid equilibrium was modeled using a thermodynamic framework that was previously applied to a variety of systems, e.g., mono-and divalent electrolyte systems (Nicolaisen et al, 1993) and amino acids (Peres and Marcedo, 1994). The model was studied for its ability to describe protein solubility of a four-component system-protein, salt ions and a two-component pseudo solvent-as a function of both salt concentration and system temperature at constant pH.…”