Excess thermodynamic properties of binary and ternary mixtures containing methyl 1,1-dimethylethyl ether (MTBE), n-heptane, and methanol at T=313.15 K

(Vapour + liquid) equilibrium of {methyl 1,1-dimethylethyl ether (MTBE) + n -heptane + methanol}, (methyl 1,1-dimethylethyl ether (MTBE)+ methanol}, an d (methanol + n-heptane) have been measured at T = 313.15 K. The data reduc tion by Barker's method provides correlations for the excess molar Gibbs en ergy G(m)(E) using the Margules equation for the binary systems, and the Wo hl expansion for the ternary. The Wilson, NRTL, and UNIQUAC models have bee n applied successfully to both the binary and ternary systems reported here . Using literature data of the excess molar enthalpy H-m(E) for the same te rnary mixture measured at T = 313.15 K, we have calculated the excess molar entropy S-m(E) for the system at the same temperature. (C) 1999 Academic P ress.