Ultrasonic study on molecular interactions in binary mixtures of formamide with 1-propanol or 2-propanol

doi:10.1016/j.cjche.2014.12.003

Abstract

Abstract: Ultrasonic speeds have been measured at 298.15 K and 308.15 K formixtures of formamide+1-propanol or 2-propanol. For an equimolar mixture, excess molar compressibility follows the sequence of 1-propanol > 2-propanol. The ultrasonic speed data are correlated by various correlations such as Nomoto's relation, van Dael's mixing relation and impedance dependence relation, and analyzed in terms of Jacobson's free length theory and Schaaff's collision factor theory. Excess isentropic compressibility is calculated from experimental ultrasonic speed data and previously reported excess volume data. The excess molar ultrasonic speed and isentropic compressibility values are fitted to Redlich-Kister polynomial equation. Other properties such as molecular association, available volume, free volume, and intermolecular free length are also calculated. The excess isentropic compressibility data are also interpreted in terms of graph theoretical approach. The calculated isentropic compressibility values are well consistent with the experimental data. It is found that the interaction between formamide and propanol increases when hydroxyl group attached to a carbon atom has more -CH₃ groups.

Key words: Ultrasonic speed, Graph theoretical approach, Formamide, Propanol, Intermolecular interaction

摘要： Ultrasonic speeds have been measured at 298.15 K and 308.15 K formixtures of formamide+1-propanol or 2-propanol. For an equimolar mixture, excess molar compressibility follows the sequence of 1-propanol > 2-propanol. The ultrasonic speed data are correlated by various correlations such as Nomoto's relation, van Dael's mixing relation and impedance dependence relation, and analyzed in terms of Jacobson's free length theory and Schaaff's collision factor theory. Excess isentropic compressibility is calculated from experimental ultrasonic speed data and previously reported excess volume data. The excess molar ultrasonic speed and isentropic compressibility values are fitted to Redlich-Kister polynomial equation. Other properties such as molecular association, available volume, free volume, and intermolecular free length are also calculated. The excess isentropic compressibility data are also interpreted in terms of graph theoretical approach. The calculated isentropic compressibility values are well consistent with the experimental data. It is found that the interaction between formamide and propanol increases when hydroxyl group attached to a carbon atom has more -CH₃ groups.

关键词: Ultrasonic speed, Graph theoretical approach, Formamide, Propanol, Intermolecular interaction

Manju Rani, Suman Gahlyan, Ankur Gaur, Sanjeev Maken. Ultrasonic study on molecular interactions in binary mixtures of formamide with 1-propanol or 2-propanol[J]. Chin.J.Chem.Eng., 2015, 23(4): 689-698.

Manju Rani, Suman Gahlyan, Ankur Gaur, Sanjeev Maken. Ultrasonic study on molecular interactions in binary mixtures of formamide with 1-propanol or 2-propanol[J]. Chinese Journal of Chemical Engineering, 2015, 23(4): 689-698.

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