Excess Molar Enthalpies for Dimethyl Carbonate with o-Xylene, m-Xylene, p-Xylene, Ethylbenzene, or Ethyl Benzoate at 298.15 K and 10.2 MPa

A flow-type isothermal microcalorimeter was used to measure excess molar enthalpies, H E, for the binary mixtures of dimethyl carbonate with o -xylene, m -xylene, p -xylene, ethylbenzene, or ethyl benzoate at 298.15 K and 10.2 MPa. The experimental H E values are positive for all the binary mixtures over the entire composition range. In comparison with the values of H E at 0.1 MPa, the excess enthalpies were found to decrease with increasing pressure for these binary systems, except for dimethyl carbonate + ethylbenzene. The maximum H E values are in the range 356.8 J·mol -1 to 652.8 J·mol -1, which are located at about x i = 0.5. The experimental H E data were correlated accurately with the Redlich−Kister polynomial equation. The Peng−Robinson and the Cubic Chain-of-Rotators equations of state with the binary interaction parameters determined from H E data at atmospheric pressure were adopted to calculate the excess enthalpies at 10.2 MPa. The Cubic Chain-of-Rotators equation with two binary interaction parameters yielded better results.