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

In this paper experimental equilibrium data of the system CO2– bergamot essential oil are reported at323 K and 343 K, in the pressure range 7.8–13.1 MPa. Furthermore equilibrium data for the subsystemCO2– linalyl acetate at 323 K are reported in the pressure range 7.0–10.3 MPa. The equilibrium data arepredicted by means of two thermodynamic models based on Peng – Robinson and PC-SAFT equations ofstate. In particular the bergamot essential oil is described as a mixture of four components: limonene,linalool, linalyl acetate and beta-caryophyllene. In the models regression parameters are calculated fromdata of binary subsystems, CO2– limonene, CO2– linalool and CO2-beta-caryophyllene, and CO2– linalylacetate. Therefore both of the models are predictive with regard to the bergamot oil and show quite agood agreement (especially the Peng Robinson one) with respect to the experimental data.