Density measurements under pressure for the binary system (ethanol + methylcyclohexane) |
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Authors: | Claus K. Zé berg-Mikkelsen,Luis Lugo |
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Affiliation: | a Center for Phase Equilibria and Separation Processes (IVCSEP), Department of Chemical Engineering, Technical University of Denmark, Building 229, 2800 Lyngby, Denmark b Laboratorio de Propiedades Termofísicas, Departamento de Física Aplicada, Facultad de Física, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain |
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Abstract: | The density of the asymmetrical binary system composed of ethanol and methylcyclohexane has been measured under pressure using a vibrating tube densimeter. The measurements have been performed for eight different compositions as well as the pure compounds at eight temperatures in the range 283.15 K to 353.15 K and ten isobars up to 45 MPa. The uncertainty for the reported densities is estimated to be 0.1 kg · m−3. A non-monotonical behavior involving a minimum in the density versus composition has been found for this binary system. The measured data have been used to study the behavior and influence of temperature, pressure and composition on the excess molar volume, the isothermal compressibility, and the isobaric thermal expansion, revealing that a volume expansion occurs for this binary system. The results have been interpreted as due to changes in the intermolecular distances or free-volume, disruption of the order molecular structure and the breaking of hydrogen bonds within the self-associating alcohol. |
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Keywords: | Alcohol Density High pressure Hydrocarbon Measurements |
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