Temperature influence on refractive indices and isentropic compressibilities of alcohol (C-2-C-4)+olive oil mixtures

This paper presents isentropic compressibilities and refractive indices on mixing of mixtures enclosing short aliphatic alkanols (ethanol, 1-propanol, 2-propanol and 1-butanol) with olive oil that have been measured in the te mperature range from 283.15 to 298.15 K and atmospheric pressure. The value s of these properties were calculated in all range of homogeneous compositi on, phase splitting appearing in the mixtures (ethanol or 2-propanol) with olive oil. From the mentioned properties, derived properties such as compre ssibility solvation numbers, isentropic apparent molar compressibility and changes of magnitudes were calculated. The enhanced packing efficiency of a lcohols at low molar fractions is strongly affected by steric hindrance of aliphatic residues, although dimers or rings of alcohol molecules are forme d at high concentrations when residue end of alkanol is small. Different mi xing rules for refractive indices on mixing were applied, as well as the co llision factor theory (CFT) formulation for isentropic compressibilities. T he thermal pressure coefficients of these solvents were analysed as a funct ion of the temperature, their shape and trend being commented upon. (C) 200 1 Elsevier Science Ltd. All rights reserved.