Phase equilibria of carbon dioxide with phenol and diphenyl carbonate

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 °C 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 kij and lij 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.