Abstract
Data on menthol + CO 2 phase behaviour and menthol solubility in dense CO 2 are needed to optimise supercritical extraction of peppermint oil. The paper presents novel experimental data for the phase diagram of (−)-menthol + CO 2 binary system in the temperature range 5–40 °C and pressures up to 8.2 MPa, including menthol melting point depression, as well as data on menthol solubility in dense CO 2 in the temperature range 30–60 °C and pressure range 6.6–14.4 MPa. The system exhibits quadruple point from which four three phase loci originate; the point was located at 4.32 MPa and 9.9 ± 0.1 °C. The solubility data obtained in this work confirm previous results of Maier and Stephan. Both the solubility of menthol and the pressure–temperature diagram of the system menthol + CO 2 were modelled with the Soave–Redlich–Kwong equation of state and good agreement with the experimental data was achieved.
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