Measurements of Binary Diffusion Coefficients, Retention Factors and Partial Molar Volumes for Myristoleic Acid and Its Methyl Ester in Supercritical Carbon Dioxide

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  • KONG Chang Yi
    Faculty of Environment and Information Sciences, Yokohama National University
  • MORI Masakazu
    Faculty of Environment and Information Sciences, Yokohama National University
  • FUNAZUKURI Toshitaka
    Department of Applied Chemistry, Institute of Science and Engineering, Chuo University
  • KAGEI Seiichiro
    Faculty of Environment and Information Sciences, Yokohama National University

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The binary diffusion coefficients, D12, and retention factors for myristoleic acid and its methyl ester at infinite dilution were measured by the chromatographic impulse response technique in supercritical carbon dioxide at temperatures of 313.2, 333.2 and 343.2 K and pressures from 9.2 to 30 MPa for the acid, and from 8.0 to 14 MPa for the ester. Although the D12 values were represented by the two correlations, the D12/T vs. CO2 viscosity and the Schmidt-number correlations, which are valid for more than 40 compounds that we have measured so far, significant temperature dependences were observed for the ester. Moreover, the D12 values for the ester at 313.2 K downward deviated from the background values around 400 kg m-3, where the partial molar volumes, obtained from the correlation between the retention factors measured and CO2 densities, showed large negative values.

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  • Analytical Sciences

    Analytical Sciences 22 (11), 1431-1436, 2006

    社団法人 日本分析化学会

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