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Diffusion measurements in binary liquid mixtures by Raman spectroscopy.

Rolf W Berg1, Susanne Brunsgaard Hansen, Alexander A Shapiro

  • 1Department of Chemistry, Kemitorvet 207, Technical University of Denmark, Lyngby, DK-2800, Denmark. rwb@kemi.dtu.dk

Applied Spectroscopy
|April 26, 2007
PubMed
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Raman spectroscopy can determine molar fractions during molecular diffusion. This study applied it to binary mixtures, yielding diffusion coefficients, though some results differed from literature values.

Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Chemical Engineering

Background:

  • Molecular diffusion is crucial in various chemical processes.
  • Accurate determination of diffusion coefficients is essential for process design and optimization.
  • Raman spectroscopy offers a potential non-invasive method for analyzing diffusion.

Purpose of the Study:

  • To investigate the application of Raman spectroscopy for determining molar fractions in binary mixtures undergoing molecular diffusion.
  • To establish a procedure for calculating time-dependent concentration profiles and diffusion coefficients.
  • To evaluate the accuracy and limitations of Raman spectroscopy for diffusion studies.

Main Methods:

  • Acquisition of Raman spectra for benzene/n-hexane, benzene/cyclohexane, and benzene/acetone mixtures.

Related Experiment Videos

  • Vertical (exchange) diffusion experiments were conducted at various heights and over time.
  • Development and application of a procedure to analyze spectral data for concentration and diffusion coefficient determination.

    • Main Results:

    • Raman spectroscopy successfully determined molar fractions and concentration profiles during diffusion.
    • Diffusion coefficients for benzene/acetone were in good agreement with literature values.
    • Significantly lower diffusion coefficients were observed for benzene/cyclohexane compared to literature, even under controlled conditions.

    Conclusions:

    • Raman spectroscopy is a viable technique for studying molecular diffusion and determining diffusion coefficients.
    • The method shows promise for analyzing complex (ternary and higher) systems where data is scarce.
    • Further studies are recommended to explore a wider range of systems and refine the methodology.