THE MUTUAL DIFFUSION-COEFFICIENT OF THE METHANOL-N-HEXANE MIXTURE AROUND THE COEXISTENCE LINE

A comparison between experimental and calculated mutual diffusion coef ficients is presented for the methanol-il-hexane mixture, around the c oexistence line. For the experimental data, we used previous reported values, as well as our own measurements performed with the Taylor disp ersion technique between 288 and 313 K, for several concentrations. Fo r theory, we used the mean-field kinetic variational theory, i.e., the exact van der Waals theory. We reproduced the experimental values, in a semiquantitative way. The mean-field theory uses attractive interac tion parameters which can be estimated when the binary system is class ified according to the Scott and van Konynenburg scheme used for class ifying binary phase diagrams. As a by-product, our method can give a m ean-field theory spinodal curve prediction. (C) 1998 Elsevier Science B.V. All rights reserved.