High-pressure equilibrium data in systems containing supercritical carbon dioxide, limonene, and citral

This paper presents experimental equilibrium data for both CO2 + limonene a nd CO2 + citral systems at a constant temperature of 315 K and at pressures varying between (3 and 10) MPa. Experimental data on the ternary system CO 2 + limonene + citral are also presented. The experiments were performed at 315 K and at two different pressure values: (8.4 and 9.0) MPa. The experim ental results obtained were correlated by means of the Peng-Robinson equati on of state and by applying mixing rules characterized by two different int eraction parameters specific to each binary subsystem present in the ternar y system. The data obtained show that limonene is characterized by higher s olubility in carbon dioxide than citral. It is therefore possible to obtain an enrichment of citral through the extraction of limonene by means of sup ercritical carbon dioxide starting from a mixture of limonene and citral.