Study on Excess Thermodynamic Parameters and Theoretical Estimation of Ultrasonic Velocity Using Scaled Particle Theory in Binary Liquid Mixtures of 2-Methyl-2-propanol and Nitriles at Different Temperatures

Abstract

Abstract: Density, ρ, ultrasonic speed, u, and viscosity, η, of binary mixtures of 2-methyl-2-propanol (2M2P) with acetonitrile (AN), propionitrile (PN) and butyronitrile (BN) including those of pure liquids are measured over the entire composition range at temperatures 298.15, 303.15 and 308.15 K. From these experimental data, the excess available volume, V_a^E, excess free volume, V_f^E, excess isothermal compressibility, β_T^E, excess thermal expansion coefficient, a^E, and excess internal pressure, π_i^E, are calculated. The variation of these properties with composition and temperature are discussed in terms of molecular interactions between unlike molecules of the mixtures. It is found that the values of V_a^E, V_f^E, β_T^E and a^E are positive and those of π_i^E are negative for all the mixtures at each temperature studied, indicating the presence of weak interactions between 2M2P and AN/PN/BN molecules. The variations of V_a^E, V_f^E, β_T^E, a^E and π_i^E values with composition indicate that the interactions in these mixtures follow the order:AN

Key words: 2-methyl-2-propanol, homologous nitriles, excess properties, molecular interactions, scaled particle theory

摘要： Density, ρ, ultrasonic speed, u, and viscosity, η, of binary mixtures of 2-methyl-2-propanol (2M2P) with acetonitrile (AN), propionitrile (PN) and butyronitrile (BN) including those of pure liquids are measured over the entire composition range at temperatures 298.15, 303.15 and 308.15 K. From these experimental data, the excess available volume, V_a^E, excess free volume, V_f^E, excess isothermal compressibility, β_T^E, excess thermal expansion coefficient, a^E, and excess internal pressure, π_i^E, are calculated. The variation of these properties with composition and temperature are discussed in terms of molecular interactions between unlike molecules of the mixtures. It is found that the values of V_a^E, V_f^E, β_T^E and a^E are positive and those of π_i^E are negative for all the mixtures at each temperature studied, indicating the presence of weak interactions between 2M2P and AN/PN/BN molecules. The variations of V_a^E, V_f^E, β_T^E, a^E and π_i^E values with composition indicate that the interactions in these mixtures follow the order:AN

关键词: 2-methyl-2-propanol, homologous nitriles, excess properties, molecular interactions, scaled particle theory

K. Rajagopal, S. Chenthilnath. Study on Excess Thermodynamic Parameters and Theoretical Estimation of Ultrasonic Velocity Using Scaled Particle Theory in Binary Liquid Mixtures of 2-Methyl-2-propanol and Nitriles at Different Temperatures[J]. , 2010, 18(5): 804-816.

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