The mixture solubilities of methyl 10-undecenoate (M10U) + methyl ricinoleate (MR) in supercritical carbon dioxide (SCCO2) were determined at temperatures from 313 to 333 K, and pressures from 10 to 18 MPa. At constant pressure, the solubilities decreased with an increase with temperature for the investigated range of operating conditions. The maximum solubility enhancement for the current mixture was observed to be 32% for the MR in a mixture of M10U + MR. The maximum selectivity of SCCO2 was 12 towards M10U in a mixture of M10U + MR. The experimental data obtained was internally consistent, as verified by Mendez-Teja model. A new association theory based model was derived and used to model the solubilities of the investigated mixture in SCCO2 along with the literature data.