Measurement of excess volumes of cycloalkanols + cyclohexane, + benzene, + toluene and + p-xylene at 308.15 K

Abstract

Abstract Mahl B.S., Kaur H., Bala P. and Bhardwaj S.S., 1992. Measurement of excess volumes of cycloalkanols + cyclohexane, + benzene, + toluene and + p -xylene at 308.15 K. Fluid Phase Equilibria , 71: 313-320. Excess molar volumes were determined as a function of composition at 308.15 K using a direct dilatometric technique for cyclopentanol, cyclohexanol and cycloheptanol with cyclohexane, benzene, toluene and p -xylene. All the cycloalkanol mixtures with benzene, toluene and p -xylene exhibit positive excess volumes over the whole mole fraction range except for cyclopentanol + toluene and cyclopentanol + p -xylene where it shows a sigmoid dependence on composition, with negative values limited to higher mole fractions of cylcopentanol. For cyclohexane mixtures, the excess volumes change from sigmoid with cyclohexanol and cycloheptanol, to positive values over the whole concentration range for mixtures with cyclopentanol. The excess volumes of these mixtures are interpreted on the basis of the structure-breaking effect of aromatic hydrocarbons and weak specific interactions of the type OH-π-electrons between unlike molecules.