Calculation of Mutual Diffusion Coefficients near the Critical Region from the Peng−Robinson Equation of State

We observed that the mutual diffusion coefficients of benzene in supercritical carbon dioxide exhibited a maximum at pressures above the critical pressure of the mixture, and a strong concentration dependence near the critical point. These surprising experimental results can be explained by replacin...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 1998-05, Vol.37 (5), p.1692-1695
Main Authors: Ago, Ken-ichi, Nishiumi, Hideo
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Solution properties
Solutions
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Summary:We observed that the mutual diffusion coefficients of benzene in supercritical carbon dioxide exhibited a maximum at pressures above the critical pressure of the mixture, and a strong concentration dependence near the critical point. These surprising experimental results can be explained by replacing the concentration gradient of diffusion with a chemical potential gradient as suggested from irreversible thermodynamics. Then, it can be understood that diffusion coefficients have a maximum value at the critical point of a mixture. The Peng−Robinson equation of state was used to illustrate these relationships.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie9706525