Phase equilibria and thermodynamic modeling of systems CO2 – bergamot oil and CO2 – linalyl acetate

Abstract

In this paper experimental equilibrium data of the system CO2 – bergamot essential oil are reported at 323K and 343K, in the pressure range 7.8–13.1MPa. Furthermore equilibrium data for the subsystem CO2 – linalyl acetate at 323K are reported in the pressure range 7.0–10.3MPa. The equilibrium data are predicted by means of two thermodynamic models based on Peng – Robinson and PC-SAFT equations of state. In particular the bergamot essential oil is described as a mixture of four components: limonene, linalool, linalyl acetate and β-caryophyllene. In the models regression parameters are calculated from data of binary subsystems, CO2 – limonene, CO2 – linalool and CO2-β-caryophyllene, and CO2 – linalyl acetate. Therefore both of the models are predictive with regard to the bergamot oil and show quite a good agreement (especially the Peng Robinson one) with respect to the experimental data.