High-Pressure phase equilibrium of the binary systems terpene oil-carbon dioxide

摘要

Terpenes are an important group of compounds found in large amounts in plants, For the separation of their complex mixtures derived from natural sources, such as essential oils, supercritical carbon dioxide extraction would be of great interest to prevent thermal degradation of the product. Therefore, the design of supercritical CO_2 extraction process requires the knowledge of the phase equilibrium data. This paper presents experimental equilibrium data for CO_2+p-cymene at temperature and pressures varying between 303-343 K and 6-15 MPa, respectively. The experimental data were obtained using a high pressure variable-volume view results were correlated with the Peng-Robinson equation using Van der Waals mixing rule and with several semiempirical methods.