Self-diffusion in binary mixtures: The system benzene/cyclohexane at high pressures

Abstract

Pulsed-gradient spin-echo proton NMR measurements were performed on a 1 : 1 mixture of benzene and cyclohexane at pressures between ambient and 200 MPa and temperatures between 298 and 333 K. A high-pressure probe head was constructed for this purpose. Since the resolution was sufficient to differentiate between the protons of both components, it was possible to obtain the single self-diffusion coefficients for benzene and cyclohexane in the mixture. The results are discussed on the basis of different theories (Thorne–Enskog, Jacucci–McDonald, Enninghorst–Wayne–Zeidler) applicable to mixtures.