Viscosity Arrhenius activation energy and derived partial molar properties in methanol +<i>N,N</i>-dimethylacetamide binary mixtures at temperatures from 303.15 K to 318.15 K

Abstract

Excess properties calculated from literature values of experimental density and viscosity in N,N-dimethylacetamide + methanol binary mixtures (from 303.15 K to 318.15 K) can lead us to test different correlation equations as well as their corresponding relative functions. Inspection of the Arrhenius activation energy Ea and the enthalpy of activation of viscous flow ΔH* shows very close values, here we can define partial molar activation energy Ea1 and Ea2 for N,N-dimethylacetamide and methanol, respectively, along with their individual contribution separately. Correlation between the two Arrhenius parameters of viscosity in all compositions shows existence of main distinct behaviours separated by particular mole fractions in N,N-dimethylacetamide. In addition, we add that correlation between Arrhenius parameters reveals interesting Arrhenius temperature that is closely related to the vapourisation temperature in the liquid vapour equilibrium and the limiting corresponding partial molar properties can permit us to estimate the boiling points of the pure components.