Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

Solvent extraction is a fractionation process applied to separate terpenes and oxygenated compounds from citrus essential oils (EOs). Once the knowledge of the physical properties of phases is crucial for equipment design and the scaling of tubes and accessories, this study focused on the evaluation of density, viscosity and interfacial tension of phases from the liquid-liquid equilibrium of citrus EOs systems. Model mixtures of orange and lemon EOs and real systems at 298.2 K were prepared, and the physical properties of their phases were thus evaluated. Increased water content in the solvent led to higher values of density, viscosity, and interfacial tension, while increased amount of oxygenated compounds caused lower interfacial tensions. Densities estimated by the simple mixing rule provided good results. Parameters of the Grunberg-Nissan model adjusted to the model systems data exhibited good description of the viscosities of real systems. The UNIFAC-VISCO model provided suitable predictions of viscosities of the solvent phases, while satisfactory results for the interfacial tensions were calculated by linear adjustment and the Bahramian-Danesh thermodynamic model, except for real acid lime system.