Relation between self-diffusion coefficients and interdiffusion coefficients in methanol-carbon tetrachloride and ethanol-carbon tetrachloride systems

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Abstract
Darken's binary diffusion equation was tested between interdiffusion coefficient and self‐diffusion coefficients for thermodynamically nonideal methanol‐carbon tetrachloride and ethanol‐carbon tetrachloride systems in which molecular association of the alcohols is known to occur. When the thermodynamic factor was calculated from equilibrium vapor pressures, Darken's equation did not hold for the two systems, but the thermodynamic factor approximately calculated from the mean degree of association of the alcohol better satisfied the equation for the systems within the low alcohol concentration range. Self‐diffusion coefficients of the respective components necessary for the present testing were measured for the methanol‐carbon tetrachloride system at 25°C. By assuming Darken's relation, mean degrees of association of the alcohols were reversely calculated for the high alcohol concentration range of the two systems.