Thermodynamic properties of binary mixtures of terpenes and 1-propanol in the temperature range from 288.15 to 323.15 K at atmospheric pressure

Abstract

Terpenes are the most abundant class of chemical compounds present in essential oils. They are considered green solvents, and come from natural sources such as plants, citrus fruits, but also from tree leaves or pinecones. They find wide commercial uses in food industry as natural flavors and food additives, as well as in pharmaceutical and cosmetics industries. In order to study thermodynamic properties of binary mixtures of terpenes (α-pinene, p-cymene and linalool) with 1-propanol, density and viscosity of these mixtures were determined experimentally. Experimental measurements were done over the temperature range from 288.15 to 323.15 K at atmospheric pressure, over the entire composition range. Excess molar volumes, viscosity deviations and thermal expansion coefficients were calculated based on the experimental results of densities and viscosities. Experimentally measured properties were correlated using the Heritz-Brewer-Jouyban-Acree model, while the Redlich-Kister polynomial was used to correlate the derrived properties. All the experimentally obtained data and the derived values were used to analyze non-ideal behavior of the selected mixtures. The Heritz-Brewer-Jouyban-Acree model successfully correlated the experimental values for all three binary systems, while the Redlich-Kister successfully correlated the derived quantities.