Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

A flow-type isothermal microcalorimeter was used to measure excess molar enthalpies HE 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 HE values are positive for all the binary mixtures over the entire composition range. In comparison with the values of HE 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 HE values are in the range of 356.8 J!Emol-1 to 652.8 J!Emol-1, which are located at about xi = 0.5. The experimental HE data were correlated accurately with the Redlich-Kister polynomial equation. The Peng-Robinson and the Cubic Chain-of-Rotator equations of state with the binary interaction parameters determined from HE 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.