Prediction of temperature dependence of the excess volume: (∂ VE/∂ T) p and (∂ 2VE/∂ T2) p for 1-alkanol + an alkane binary systems in terms of an associated mixture model

Abstract

The predictive ability of the model proposed by Treszczanowicz and Benson [Fluid Phase Equilib. 23 (1985) 117] is tested for temperature dependence of the excess volume: excess molar isobaric thermal expansion defined as A p E=( ∂V E/ ∂T) p and ( ∂ 2 V E/ ∂T 2) p for binary systems formed by an 1-alkanol (from C 2 to C 12) and an alkane (from C 4 to C 14) for all available literature data. The model equations for these properties are expressed as sums of the three contributions: self-association described by athermal associated mixture model and free volume and non-specific interactions described by Flory equation of state. The model correctly predicts A p E and sign of temperature derivative ( ∂ 2 V E/ ∂T 2) p for regarded class of mixtures. Moreover, the model predicts complex shape of the A p E curve and its temperature changes for diluted 1-decanol in n-hexane solutions.