Excess molar volumes of the ternary system {methylcyclohexane (1) plus cyclohexane (2) plus n-alkanes (3)} at T=298.15 K

Densities were experimentally determined in the whole range of composition at T = 298.15 K for the ternary system {methylcyclohexane (1) + cyclohexane (2) + n-alkanes (3)} and for the seven corresponding binary systems. The n-alkanes include n-hexane, n-heptane, and n-octane. Excess molar volumes, V-E, were calculated for the binaries and ternaries systems. The V-123(E) data are positive over the entire range of composition for the systems {methylcyclohexane (1) + cyclohexane (2) + n-heptane (3) or n-octane (3)} at three fixed compositions (f(m) = X-1/X-2). For the system {methylcyclohexane (1) + cyclohexane (2) + n-hexane (3)} the V-E values showed positive for f(m) = 0.3 and negative for f(m) = 3. The V-E data exhibit, an inversion in sign in the mixture containing f(m) = 1 for later ternary system. Several empirical expressions are used to predict and correlate the ternary excess molar volumes from experimental results on the constituted binaries and analyzed to gain insight about liquid mixture interactions. (c) 2005 Elsevier Ltd. All rights reserved.