Excess molar enthalpies of ternary mixtures (dibutyl ether or dipropyl ether + 2,2-dimethylbutane + 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 {x1(dibutyl ether or dipropyl ether) + x2 2,2-dimethylbutane + (1 − x1 − x2) 2,3-dimethylbutane}. A smooth representation of the results is described and the constant-enthalpy contours for each ternary system are displayed on the respective Roozeboom diagrams. The results serve to show 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 constituent pure components and the parameters determined from the binary mixtures of these components.

► The excess enthalpies of the (DNBE or DNPE + 22DMB + 23DMB) systems at 298.15 K have been measured.
► The measured excess enthalpies are all positive.
► The Libermann–Fried model can be used to correlate the excess enthalpies of the constituent binary systems.
► The Libermann–Fried model can be used to predict with confidence the excess enthalpies of the ternary systems.