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Evaluation of Excess Thermodynamical Factors in the Binary Mixture of Propanols and Alkanes with the Variation of Temperature

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Temperature dependent evaluation of excess thermodynamical parameter such as excess free energy of mixing and excess molar polarization in the binary mixture of propanols (n-propanol, i-propanol) and alkanes (n-hexane, n-heptane, cyclohexane) have been carried out within a temperature range of 303 K to 318 K. Both excess free energy of mixing and excess molar polarization decreases with increase in temperature as the rise in temperature increases the internal energy of the mixture and affects the orientation of the induced dipoles. The formation of β-multimers due to the interaction between polar and induced nonpolar molecules maximize the excess free energy of mixing at lower concentration (0.2–0.3 mole fraction) of propanols. However, n-heptane is proved to be the suitable alkane for providing significantly higher value of excess free energy of mixing and excess molar polarization in the binary liquid mixtures due to the presence of an even number of C-atoms. The excess free energy of mixing and excess molar polarization in the binary mixtures of n-propanol with alkanes is considerably large in comparison to i-propanol and butanols.
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Keywords: BINARY LIQUID MIXTURE; EXCESS MOLAR POLARIZATION; FREE ENERGY OF MIXING

Document Type: Research Article

Publication date: February 1, 2016

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