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(p, Vm, T, x) measurements of dimethyl carbonate + octane binary mixtures

2002; Elsevier BV; Volume: 199; Issue: 1-2 Linguagem: Inglês

10.1016/s0378-3812(01)00809-3

1879-0224

Luis Lugo, Marı́a J. P. Comuñas, Enriqueta R. López, Josefa Fernández,

Chemical Thermodynamics and Molecular Structure

Excess molar volume, VmE has been calculated from experimental density data for liquid mixtures of dimethyl carbonate with octane over the temperature range from 278.15 to 353.15 K and for pressures up to the lowest of either near the appearance of liquid–liquid equilibrium (LLE) of this mixture or 25 MPa. We propose a new fitting equation of the excess molar volumes as a function of temperature, T, mole fraction, x, and pressure, p. We have never seen, such a correlation in literature. This equation was used to fit 717 experimental VmE values for the dimethyl carbonate+octane mixture, obtaining a standard deviation (0.023 cm3 mol−1) slightly higher than the experimental uncertainty (0.005 cm3 mol−1) and than the standard deviation obtained for the VmE (x) correlations for each isobar and isotherm (around 0.020 cm3 mol−1).