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Coherent Analysis of Fickian Diffusion in Mixtures of Cyclohexane, Toluene, and Methanol

par Santos, Cecilia;Mialdun, Aliaksndr ;Barros, Marisa M.C.F.;Shevtsova, Valentina ;Ribeiro, Ana C F
Référence Physics and Mechanics of New Materials: Synthesis, Processing, and Emerging Applications, Apple Academic Press, Ed. 1, page (32)
Publication Publié, 2024

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Résumé :

Diffusion coefficients provide important information of different aspects of mass transport that are extremely important to understand the behavior of complex solutions. The nonideal mixture of cyclohexane, toluene, and methanol has remarkable interest since it exhibits a miscibility gap in ambient conditions. This work presents a parametric description of the Fickian diffusion data for the binary subsystems of the mixture composed of toluene, cyclohexane, and methanol in different steps. Determination of binary Fickian diffusion coefficients through various methods, namely optical beam deflection, optical digital interferometry, Taylor dispersion technique among others, was carried out in stationary and transient regimes. Results are presented together with a summary of the available literature data, compiling a database. From 246this database, the values of mutual diffusion coefficients at infinite dilution limits were determined for all three binary mixtures. After fixing the limiting values, correlations for mutual diffusion in concentrated binary solutions, consistent with the diluted limits, were established, providing a model that allows knowledge of the diffusion coefficient in concentration regions not covered by the measurements. The ternary Fickian diffusion coefficients were experimentally reported using the Taylor dispersion technique, and qualitative analysis is done, using the obtained binary dependencies as boundary conditions.