Liquid-Liquid Equilibria of Three Ternary Systems: Glycerol + Acetone + Water, Glycerol + 1, 4-Dioxane + Water, and Glycerol + Acetonitrile + Water

Abstract

Liquid-liquid equilibria of three ternary systems {glycerol + acetone + water}, {glycerol + 1, 4-dioxane + water}, and {glycerol + acetonitrile + water} were measured at temperatures of 288.15, 298.15, and 308.15 K. The results of the first two systems were satisfactorily correlated with the UNIQUAC equation with average deviations of 0.74 and 0.81%, respectively. Those of the last system were well correlated with a deviation of 2.49%. Glycerol was verified as a suitable solvent to remove water from acetone + water and acetonitrile + water solutions, through investigation of the distribution coefficients and selectivity for water, combining vapor-liquid equilibria of the systems {acetone + water} and {acetonitrile + water} at atmospheric pressure.

Parameter Identification in Liquid-Liquid Equilibrium Modeling of Food-Related Thermodynamic Systems Using Flower Pollination Algorithms

“…Overall, the parameter identification involves the determination of model parameters, which should represent satisfactorily certain properties or characteristics of the system under study. The parameter identification problem in phase equilibrium modeling deals with equations that are non-linear-in-theparameters and, consequently, robust optimization techniques have to be applied in its resolution [1,9]. In particular, local composition models are traditionally used as the thermodynamic framework for the prediction and estimation of physicochemical properties of food systems involving liquid phases.…”

“…Liquid-liquid equilibrium (LLE) data are essential for the proper design in the food products industry [1,2]. For instance, the solvent extraction is a LLE-based process commonly used in this sector, which is an environmentally friendly operation that needs less energy and produces minor environmental pollution than other separation schemes [1,2]. This industry also employs intensified operations where the processing mixtures may show a complex phase behavior at different operating conditions including the presence of LLE [3].…”