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Issue 17, 1997
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Excess molar enthalpies of nitrousoxide–octane in the liquid and supercriticalregions

Abstract

The excess molar enthalpies H m E of [xN 2 O+(1-x)C 8 H 18 ] have been measured in the liquid and supercritical region over the whole concentration range. Mixtures at 308.15 K and 7.64, 9.48 and 12.27 MPa show moderately endothermic and exothermic mixing in the octane-rich region and nitrous oxide-rich region, respectively. The exothermic-mixing region is confined to a smaller range of x, as pressure increases, and disappears completely at 308.15 K and 15.00 MPa. Mixtures at 318.15 K and 7.64 and 9.48 MPa show very exothermic mixing. The magnitude of the minimum observed at 318.15 K decreases as the pressure increases and mixtures at 318.15 K and 12.27 and 15.00 MPa exhibit endothermic mixing in the octane-rich region. The temperature and pressure effects on the H m E values are both large and of opposite sign. These effects are discussed in terms of a liquid–vapour equilibrium and critical constants for nitrous oxide–octane. Excess enthalpies for nitrous oxide–octane mixtures are also calculated using the Peng–Robinson equation of state and the resulting H m E values are compared with experiment.

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Article type: Paper
DOI: 10.1039/A701476G
J. Chem. Soc., Faraday Trans., 1997,93, 3067-3071

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    Excess molar enthalpies of nitrous oxide–octane in the liquid and supercritical regions

    A. Cabañas, B. Pittau, C. Pando and J. A. R. Renuncio, J. Chem. Soc., Faraday Trans., 1997, 93, 3067
    DOI: 10.1039/A701476G

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