TRACER DIFFUSION IN DENSE ETHANOL - A GENERALIZED CORRELATION FOR NONPOLAR AND HYDROGEN-BONDED SOLVENTS

Tracer diffusion coefficients were measured for benzene, toluene, mesitylene, naphthalene, and phenanthrene in dense ethanol at 0. 56 less than equivalent to T //R less than equivalent to 1. 07 and rho R greater than equivalent to 1. 44. The results were used to examine the temperature dependence of the degree of association between ethanol molecules across the entire range of temperature. The hard-sphere tracer diffusion equation and the Stokes-Einstein equation were used to develop two engineering correlations. The former approach was found to be adequate for solvents of relatively compact molecules, and the latter to be more general in its applications. This work is pertinent to separation process design.