Excess molar volumes of (carbon dioxide + ethene) mixtures in the liquid and near-critical regions

Flow calorimetric measurements of the excess molar volume VmE for {xCO2+(1−x)C2H4} are described. The measurements cover the range 260.95–315.75 K at pressures from 3.5 to 12.6 MPa. Liquid phase measurements were made at the pressure 11.0 MPa over the range 260.95–300.45 K, and at pressures slightly greater than the saturation pressure of ethene or the critical pressure locus for the mixture. At x=0.5 and at the four temperatures 285.85, 300.45, 306.25 and 315.75 K, excess volume measurements were made over a range of pressures from 3.0 to 12.6 MPa. The measurements at 285.85 and 300.45 K traverse the critical locus for the mixture, and those at 306.25 and 315.75 K are in the super critical region. The measurements are compared with curves generated from the Patel–Teja equation of state, which does not quite fit the measurements but reproduces the main features of the observed behavior.