(262af) Phase Equilibrium of Major Components of Essential Oils in Liquid and Supercritical Carbon Dioxide

The solubility of terpinen-4-ol, alpha-cedrene and alpha-pinene in both liquid and supercritical carbon dioxide were determined using the dynamic solubility method. Experimental conditions were 25°C, 40°C, 50°C and 60°C and pressures corresponding to pure CO₂ densities of 0.2067, 0.3149, 0.4222, 0.5848 and 0.6971 g/mL. Solubility of each component increased with density along each isotherm. Experimental results were correlated by the Peng-Robinson equation of state using conventional mixing rules with two interaction parameters.