Volumetric properties of carbon dioxide plus toluene at high pressures

Volumetric behavior of carbon dioxide + toluene has been investigated at (323, 348, 373, 398, and 423) K at pressures up to 70 MPa. Densities for pure components and mixtures containing (58, 68, 80, and 88) mass % carbon dioxide are determined as a function of pressure at each temperature. It is shown that with increasing pressure the density of carbon dioxide becomes greater than that of toluene. Mixture densities also show a density crossover at different pressures depending upon the composition. In the composition range evaluated, the excess volume of the mixtures is observed to be mostly negative. It becomes more negative with increasing temperature, but less negative with increasing pressure.