Volumetric properties and viscosities of the methyl butanoate + heptane + 1-octanol ternary system and its binary constituents in the temperature range from 283.15 to 313.15 K

Abstract

Densities and kinematic viscosities for the (heptane or methyl butanoate) + 1-octanol binary systems were determined throughout the whole composition range at the temperatures of 283.15, 293.15, 303.15 and 313.15 K under atmospheric pressure. The same properties were also determined for the ternary system methyl butanoate + heptane + 1-octanol at 283.15 and 313.15 K. The binary excess molar volumes were used for the calculation by analytical differentiation of other mixing quantities such as the isobaric thermal expansion coefficients, the temperature coefficients of the molar excess volume and the pressure coefficients of the molar excess enthalpy. The values of the volumetric properties obtained for both binary and ternary systems were compared against those obtained applying the group-contribution molecular model of Nitta et al., using parameter sets already available in the literature. The feasibility of several specific equations to correlate composition–viscosity data from binary and ternary systems was tested. Viscosity values were compared, as well, with those predicted by the group-contribution models UNIFAC-VISCO and UNIVAC. Finally, results from several empirical and semiempirical models for predicting ternary properties from only its binary subsystems results were compared to both the experimental excess volumes and viscosity deviations of the ternary systems.