Experimental data on vapor-liquid equilibria (VLE) in the ternary system orange peel oil (limonene) + ethanol + carbon dioxide were measured at the temperature of 333 K and pressures from 50 to 100 bar. The orange peel oil contains about 95 wt.% limonene. Cubic equations of state (PR. SRK) coupled with the G(E)-EOS mixing rules were used to predict ternary VLE at supercritical conditions of the system limonene + ethanol + carbon dioxide. The mixing rule models MHV1. MHV2 and HVID were used. The prediction of the ternary phase behavior is based on binary interaction parameters of the G(E)-EOS model, obtained by correlation of binary VLE data. VLE data for limonene + CO2 and ethanol + CO2, available in literature, were used. For the binary limonene + ethanol system data were generated by UNIFAC 93 method. The prediction of VLE for the ternary system limonene + ethanol + carbon dioxide was compared with experimental data on VLE in the ternary system orange peel oil (limonene) + ethanol + carbon dioxide. assuming that the orange peel oil can be approximated with only one component, the limonene. (C) 2002 Elsevier Science B.V. All rights reserved.