Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

This paper presents experimental viscosity and density measurements for two binary mixtures of ethanol with 1-hexanol and 1-heptanol that cover the complete composition range from (293.15 to 328.15) K at 0.1 MPa. A vibrating tube densimeter provides density measurements, whereas viscosities come from a pellet microviscometer. The excess molar volumes calculated from the experimental data have positive deviations from ideality over the temperature range. Calculated viscosity deviations from the experimental data show negative deviations from a mole fraction weighted average of the pure component viscosities over the temperature range. A Redlich Kister type equation correlates the data satisfactorily. We have correlated the three-body McAllister to the experimental kinematic viscosity. Comparison of the experimental viscosity data to predictions from a generalized, three-body McAllister and a generalized corresponding states principle (GCSP) equation shows that the generalized McAllister equation is superior predicting the kinematic viscosity within an average absolute percentage deviation of 1.24%. Finally, molecular dynamics was performed to compare density and viscosity results with those obtained experimentally. Results for density agree with the experimental measurements, whereas viscosity calculations are beyond the experimental error.