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High-pressure volumetric properties of binary mixtures of methyl tert-butyl ether + alcohols


D. Hauk1 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: high-pressure
property: volumetric properties
material: methyl tert-butyl ether, alcohol

As a continuation of our study involving volumetric properties containing methyl tert-butyl ether (MTBE) and alcohol [1], in the present work, densities of binary mixture of MTBE + methanol, or + ethanol, or +1-propanol, or + 1-butanol have been determined as a function of composition at 290.15 K in a pressure range from (1 to 35) MPa. Both pure liquid and mixture densities were measured using a vibrating tube Anton Paar DMA 4500 densimeter, connected to an external Anton Paar HP high-pressure measuring cell, which enables density measurements up to 70 MPa. The measured densities were used to study the effect of pressure 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: butanol > 1-propanol > ethanol ~ methanol. For all studied systems, excess molar volume decreases with increasing in pressure of the mixtures. The partial molar volumes at infinite dilution of each component have been determined using three different methods. The results obtained are discussed in terms of intermolecular interactions, particularly hydrogen-bonding interactions between like and unlike molecules.

References
  1. H.E. Hoga, R.B. Tôrres, J Chem. Thermodynam., accepted for publication.

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