Excess enthalpies of mixing methane with methanol, n-heptane, toluene and methylcyclohexane at 255.4 and 310.9 K and 13.8 MPa

Excess molar enthalpies, HE, have been measured for methane with methanl, n-heptane, toluene, and methylcyclohexane at 310.9 and 255.4 K and at 13.8 MPa. Four ternary systems were also studied. These included (methane + (88.2% toluene + 11.8% methanol)), (methane + (93.4% toluene +6.6% methanol)), (methane + (87.8% methylcyclohexane + 12.2% methanol)), and (methane + (93..8% methylcyclohexane + 6.2% methanol)). The HE values have been fitted using an ordinary Redlich-Kister equation and a linear least-squares method over the one-phase and the two-phase regions, respectively. A modified Redlich-Kister equation was used to fit HE values for (methane + n-heptane). The solubility of methane in the liquid phase has been determined from the plot of HE vs. the mole fraction.