Prediction of Multicomponent Diffusion Coefficients in Liquids

摘要

Knowledge of diffusion coefficients in liquids is of great interest for the calculation and simulation of mass transfer processes. In the literature, several prediction models for binary diffusion coefficients are found. For multicomponent systems, however, only a few models exist. Due to lack of ternary diffusion data, these models have not been verified for real systems until now. To overcome this limitation, multicomponent diffusivities were measured within the whole concentration space of several ternary systems. Fick diffusivities were transformed to less concentration-dependent Maxwell-Stefan diffusivities using the thermodynamic correction factor. Four prediction. models were tested by a comparison of predicted values to experimental data. In some systems, multicomponent diffusion prediction shows promising results. However, the quality of predicted diffusion coefficients strongly depends on an accurate thermodynamic description of the system.