Excess volumes of binary mixtures of ethylbenzene with octanol, nonanol and dodecanol from 50 to 100°C and 0.1 to 7.5 MPa

Abstract

The excess volume V^E of binary mixtures of octanol, nonanol and dodecanol in ethylbenzene have been calculated from the densities measured with a vibrating tube densimeter at temperatures from 50 to 100 °C and at pressures from 0.1 to 7.5 MPa. The values of V^E are positive for all the three mixtures in the complete temperature, pressure and mole fraction ranges studied. The maxima in V^E is observed at 0.4 mole fraction of alkanol. The results are discussed in terms of specific nteractions present in the binary mixtures. The second order thermodynamic quantities (∂ V^E / ∂T)_p,(∂V^E/ ∂P)_T and ∂V_E/ ∂P)_T which have been derived from the effect of temperature and pressure on V^E, indicate an overall net creation of order in the binary mixtures of ethylbenzene with higher homologues of alkanols.