Experimental determination of high-pressure phase equilibria of the ternary system carbon dioxide + limonene + linalool

The high-pressure phase behavior of the ternary system carbon dioxide + limonene + linalool was determined experimentally by a synthetic method. All the experiments were carried out in an approximately constant molar concentration of carbon dioxide equal to 98.00%. The ratio of limonene to linalool was varied from 0 to 1 through 12 different concentrations. Under these conditions, no liquid–liquid immiscibility was observed for this system. The data included bubble points, critical points and dew points within a temperature and pressure range of 293–349 K and 5–14 MPa, respectively. The results were compared with ternary data of ethane + limonene + linalool at similar conditions of constant supercritical fluid concentration and varying limonene to linalool ratios. The results indicated that supercritical extraction of citrus oils could be carried out at lower pressures if ethane is used instead of carbon dioxide.