Excess molar enthalpies of ternary mixtures (1-hexene + tetrahydrofuran + 2,2-dimethylbutane or 2,3-dimethylbutane) at the temperature 298.15 K

Excess molar enthalpies, measured at the temperature 298.15 K and atmospheric pressure conditions by means of a flow microcalorimeter, are reported for the ternary mixtures x 1 C 6 H 12 + x 2 C 4 H 8 O + ( 1 - x 1 - x 2 ) { ( CH 3 ) 3 CCH 2 CH 3 or ( CH 3 ) 2 CHCH ( CH 3 ) 2 } . A smooth representation of the results is described and used to construct constant-enthalpy contours on a Roozeboom diagram. It is shown that good estimates of the excess molar enthalpies of the ternary systems can be obtained from the Liebermann–Fried model by using the physical properties of the components and the parameters determined from their binary mixtures.