Diffusion Coefficients in Binary Liquid Mixtures

We have calculated F using the activity coefficient models in Appendix D with parameters from the literature (see Examples 4.1.2 and 4.1.3). 

To explain the rather striking difference in the behavior of the Fick D and 

Maxwell-Stefan we recall from Section 3.3.1 that the Fick D vanishes along the spinodal 

More comprehensive collections of liquid diffusivity data can be found in the reviews by Johnson and Babb (1956) and a two-part review by Dullien and co-workers (Ghai et al., 1973 Ertl et al., 1974). The book by Tyrrell and Harris (1984) is a good place to begin a search for experimental measurements of D. 

4 Estimation of Diffusion Coefficients in Dilute Liquid Mixtures 

---

Diffusion coefficients in binary liquid mixtures are of the order 10 m /s. Unlike the diffusion coefficients in ideal gas mixtures, those for liquid mixtures can be strong functions of concentration. We defer illustration of this fact until Chapter 4 where we also consider models for the correlation and prediction of binary diffusion coefficients in gases and liquids. 

Diffusion coefficients in binary liquid mixtures can be strong functions of composition. To illustrate this fact we have plotted experimental data for a few systems in Figure 4.1. The Maxwell-Stefan coefficient > also is shown in Figure 4.1. To obtain the Maxwell-Stefan coefficients we have divided the Fick D by the thermodynamic factor F... 

Carry out a review of methods for estimating infinite dilution diffusion coefficients in binary liquid mixtures. Your review should include calculations to test the accuracy of the methods that have been proposed. Fundamental data for computing the coefficients should be obtained from a single source as far as is possible we recommend the compilation by Daubert and Danner (1985). 

---