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Volumetric properties of acetonitrile + amine mixtures at several temperatures


S. Bittencourt1 and R. Tôrres2

1Departamento de Engenharia Mecânica, Centro Universitário da FEI, São Bernardo do Campo, SP, Brazil
2Departamento de Engenharia Química, Centro Universitário da FEI, São Bernardo do Campo, SP, Brazil

Keywords: binary mixtures
property: volumetric properties
material: acetonitrila, amines

As a continuation of our study involving volumetric properties containing acetonitrile and amines [1-2], in the present work, densities of binary mixture of acetonitrile + propylamine (PA), or + dipropylamine (DPA), or + n-butylamine (n-BA), or + tert-butylamine (t-BA), or + trietylamine (TEA) have been measured, as a function of composition at different temperatures and at atmospheric pressure. The studied temperatures were 293.15, 298.15, 303.15 and 308.15 K. Density measurements of liquid pure and mixtures were performed by means of vibrating-tube densimeter (Anton Paar, DMA 4500) which was calibrated with distilled water and air. The measured densities were used to study the effect of temperature on the derived volumetric properties such as excess, apparent and partial molar volumes. Excess molar volume is negative over the entire composition range for all investigated systems and the negative deviation follows the order: tert-butylamine > trietylamine > dipropylamine > propylamine > n-butylamine. For the (acetonitrile + n-butylamine), (acetonitrile + propylamine) and (acetonitrile + tert-butilamine) systems, excess molar volume decreases whereas for (acetonitrile + dipropylamine) and (acetonitrile + trietylamine) systems, excess volume increases with increasing in temperature of the mixtures. The partial molar volumes at infinite dilution of each component have been determined using three different methods. The experimental results are discussed in terms of intermolecular interactions, particularly hydrogen-bonding interactions between like and unlike molecules.

References
  1. R.B. Tôrres, A.Z. Francesconi, Fluid Phase Equilib. 200, 317 (2002)

  2. R.B. Tôrres, A.Z. Francesconi, J. Mol. Liquids, 103, 99 (2003)

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