Volumetric and thermodynamic properties of binary mixtures of p-cymene with α-pinene, limonene and citral at atmospheric pressure and temperatures up to 323.15 K

• Published in: Journal of molecular liquids 2021-12, Vol.344, p.117486, Article 117486
• Main Authors: Ilić-Pajić, Jovana, Radović, Ivona, Grozdanić, Nikola, Stajić-Trošić, Jasna, Kijevčanin, Mirjana
• Format: Article
• Language: English
• Subjects: Binary mixtures; P-cymene; Prigogine-Flory-Patterson model; Terpenes; Thermophysical properties
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2021.117486

•Mixtures of terpenes show slight deviations from ideal behavior.•Geometrical packaging of pure terpenes is dominant effect for non-ideal behaviour.•Prigogine-Flory-Patterson model successfully correlates excess volumes of terpenes. An experimental analysis of density, refractive index, speed of sound and the viscosity at atmospheric pressure and temperatures T = (288.15 to 323.15) K has been carried out for the three binary systems, i.e. (p-cymene + α-pinene), (p-cymene + limonene) and (p-cymene + citral). Excess molar volumes, viscosity deviations, deviations in isentropic compressibility and excess Gibbs free energy of activation of viscous flow were calculated from experimental data. The results were fitted employing Redlich-Kister polynomial equation. Also, partial molar volumes, excess partial molar volumes and partial molar volumes at infinite dilutions were calculated to elucidate the non-ideal behavior of investigated mixtures. Furthermore, Prigogine-Flory-Patterson (PFP) model was successfully applied for the correlation of excess molar volumes of examined binary mixtures. The results of excess molar volume correlations show very good agreement with experimental measurement.