TEMPERATURE AND INITIAL DENSITY-DEPENDENCE OF EXPERIMENTAL VISCOSITY AND CALCULATED DIFFUSION-COEFFICIENTS FOR BINARY VAPOR MIXTURES OF BENZENE PHENOL

High-precision viscosity data were determined for vapor mixtures of be nzene-phenol at relatively low densities by means of an all-quartz osc illating-disk viscometer with small gaps. Five series of measurements each differing in the mole fraction as well as in the density were per formed in the temperature range 400-637 K up to 0.0136 mol.L-1. The ev aluation of the experimental data with the modified Enskog theory incl uding the initial density dependence of viscosity instead of the Chapm an-Enskog theory for the transport properties of dilute gaseous mixtur es has resulted in consistent values of the interaction viscosity in t he limit of zero density. The obtained results have been used to deriv e binary diffusion coefficients.