A visual and volume-variable high-pressure phase equilibrium analyzer was used for measuring the vapor-liquid phase boundaries of the ternary systems containing carbon dioxide and mixed solvents of dimethyl sulfoxide (DMSO)+ ethanol or chloroform + methanol at temperatures from 298.15 K to 348.15 K over wide composition ranges including near critical points. Four pseudo-binary systems of carbon dioxide plus mixed solvents with constant molar ratios of DMSO/ethanol =3/7, 5/5, 7/3, and chloroform/methanol = 1/2, were studied in this work. The critical conditions at each investigated temperature were estimated from the experimental isothermal phase boundaries by interpolation. The Peng-Robinson equation of state with the two-parameter yan der Waals mixing rules was applied to calculate the phase boundaries. The experimental values were compared with the predicted results from the Peng-Robinson equation using the binary interaction parameters determined from the vapor-liquid equilibrium data of the constituent binaries. The agreement is reasonably well for carbon dioxide + chloroform + methanol, but obvious overestimations are found near the critical regions of carbon dioxide +DMSO+ ethanol, especially at higher temperatures. (C) 2013 Elsevier B.V. All rights reserved.