Density and Viscosity of Binary Mixtures of {1-Butyl-3-methylimidazolium Thiocyanate+1-Heptanol, 1-Octanol, 1-Nonanol, or 1-Decanol}

Density and viscosity were determined for binary mixtures containing the ionic liquid 1-butyl-3-methylimidazolium thiocyanate ([BMIM][SCN]) and 1-alcohol (1-heptanol, 1-octanol, 1-nonanol, or 1-decanol) over the temperature range (298.15 to 348.15) K and ambient pressure. The temperature dependence of density and viscosity for these systems can be described by an empirical second-order polynomial and by the Vogel-Eucher-Tammann equation, respectively. Excess molar volumes and viscosity deviations were calculated and correlated by the Redlich-Kister polynomial expansions. These systems exhibit negative molar excess volumes. Volume expansivity and excess volume expansivity were described as functions of temperature and composition. The polynomial correlations describe the variation of density and viscosity with composition. For each system and for a chosen number of the Redlich-Kister parameters, A(r), the partial excess molar volumes, V-1(E) and V-2(E), are presented. The Prigogine-Flory-Paterson (PEP) and the Flory-Benson-Treszczanowicz (FBT) models were used for the prediction of V-m(E), and H-m(E) of the measured systems. A comparison of the results for the four binary systems elucidates the influence of I-alcohol carbon chain length on their physical properties.