Diffusion coefficients of methanol and water and the mutual diffusion coefficient in methanol-water solutions at 278 and 298 K

Diffusion coefficients have been measured for methanol and water in their mixtures over the full composition range at 278.15 and 298.15 K. By defining a reduced coefficient D/sup +/+/ for each component an extensive correlation in diffusional behavior has been identified for the two species. The correlation increases with decreasing temperature. Examination of literature data for acetonitrile-water and acetone-water at 298.15 K shows that similar correlations are not present in those systems. Data are also reported for the mutual diffusion coefficients for the methanol-water system at both temperatures and these are used to obtain velocity correlation coefficients. The Albright equation relating the shear viscosity of a mixture to the diffusion coefficients of its components is examined by using the diffusion data and an interaction parameter introduced. 21 references, 5 figures, 5 tables.