Excess Enthalpy, Density, and Speed of Sound for the Ternary Mixture Methyl <i>tert</i>-Butyl Ether (1) + Butan-1-ol (2) + Octane (3)

Excess molar enthalpies, HE(x, T), at T = 298.15 K, densities, ρ(x, T), and speeds of sound, u(x, T), at temperatures T = (288.15 to 308.15) K and atmospheric pressure have been measured for the ternary system methyl tert-butyl ether (MTBE) (1) + butan-1-ol (2) + octane (3). Also, densities, ρ(x, T), and speeds of sound, u(x, T), for the binary mixture MTBE (1) + octane (3) and excess molar enthalpies, HE(x, T), T = 298.15 K, for the binary mixture butan-1-ol (2) + octane (3) have been measured. From experimental data, excess molar volumes, VE(x, T), and excess isentropic compressibility, κSE (x, T), were calculated. The Cibulka equation was used to correlate the ternary contribution to the experimental excess molar volume and excess isentropic compressibility. Additionally, excess molar enthalpies were correlated with the Nagata and Tamura equation, and the experimental results are compared with the estimations obtained by applying the group-contribution models of UNIFAC and DISQUAC.