Excess enthalpies of {2,2-dimethylbutane plus hexane plus (octane or dodecane)} at the temperature 298.15 K

Measurements of excess molar enthalpies at the temperature 298.15 K in a flow microcalorimeter are reported for the ternary mixtures {x(1)(CH3)(3)CCH2CH3 + x(2)CH(3) (CH2)(4)CH3 + (1 - x(1) - x(2))CH3(CH2)(6)CH3} and {x(1)(CH3)(3)CCH2CH3 + x(2)CH(3) (CH2)(4)CH3 + (1 - x(1) -x(2))CH3(CH2)(10)CH3}. Smooth representations of the results are described and used to construct constant-enthalpy contours on Roozeboom diagrams. It is shown that useful estimates of the ternary enthalpies can be obtained from the Flory theory using only the physical properties of the components and their binary mixtures. (C) 2000 Academic Press.