Solubilities of essential oil components of orange in supercritical carbon dioxide

The solubilities of pure limonene and linalool in compressed carbon dioxide have been measured using a flow apparatus at 318.2 K and 328.2 K and pressures ranging from 69 bar to 111 bar. The solubilities were successfully modeled using equations of state (Peng-Robinson, Soave-Redlich-Kwong, 3P1T, Dohrn and Prausnitz nopolar) and a semiempirical equation (Chrastill model). The generalized parameters for the Peng-Robinson EOS were obtained for each system. These parameters were independent of temperature, and they reproduce successfully all data available in the literature. The results show that the solubility of limonene in supercritical carbon dioxide was bigger than the solubility of linalool. The behavior of the systems was discussed by estimation of the best conditions of supercritical extraction. Those conditions were elevated pressure and a temperature near the critical temperature of carbon dioxide.