Viscosity Arrhenius activation energy and derived partial molar properties in of N,N-dimethylacetamide + 2-ethoxyetha nol binary mixtures at temperatures from 298.15 K to 318.15 K

• Published in: Physics and chemistry of liquids Vol. 51; no. 6; pp. 721 - 730
• Main Authors: Hichri, M, Das, D, Messaadi, A, Hmida, ESBel Hadj, Ouerfelli, N, Khattech, I
• Format: Journal Article
• Language: English
• Published: 01-11-2013
• Subjects: Activation energy; Binary mixtures; Correlation; Density; Liquids; Mathematical analysis; Vapour; Viscosity
• ISSN: 0031-9104; 1029-0451
• DOI: 10.1080/00319104.2013.802210

Calculation of excess properties in N,N-dimethylacetamide + 2-ethoxyetha nol binary mixtures at (298.15, 308.15 and 318.15) K from experimental density, viscosity and sound velocity values were presented in previous work. Applications of these experimental values to test different correlation equations as well as their corresponding relative functions were also reported. Considering the quasi-equality between the Arrhenius activation energy Ea and the enthalpy of activation of viscous flow Delta H*, here we can define partial molar activation energy Ea1 and Ea2 for N,N-dimethylacetamide and 2-ethoxyethanol, respectively, along with their individual contribution separately. Correlation between the two Arrhenius parameters of viscosity in all the domains of composition shows the existence of two main distinct behaviours separated by a stabilised structure in a short range of mole fraction in N,N-dimethylacetamide from 0.14 to 0.45. We add that correlation reveals interesting Arrhenius temperature, which is closely related to the vaporisation temperature in the liquid vapour equilibrium.