We report the vapor-liquid equilibria (VLE) of the two binary systems (carbon dioxide-phenol) and (carbon dioxide-diphenyl carbonate (DPC)). The bubble points are measured using a Cailletet apparatus in the temperature range 70-180 degreesC and pressures up to 130 bar. The experimental data are adequately represented by the Peng-Robinson equation of state (PR EOS) with quadratic mixing rules. The two binary interaction parameters k(ij) and l(ij) are obtained by fitting, and, were found to have a linear dependency with temperature. The data available from literature for the CO2-phenol system could also be predicted very well by the same model and parameter values. (C) 2002 Elsevier Science B.V. All rights reserved.