A correlation for predicting liquid diffusion coefficients at infinite dilution was developed based on theoretical models. In the correlation

a concept of pseudoviscosity was used

which could be determined from the viscosity of mixtures

or estimated from the viscosity of pure components. The average absolute deviation for 50 diffusion coefficient data was 10.6% by using the pseudoviscosities calculated from the pure component viscosities

while those calculated by the Wilke-Chang equation and Tyn-Calus equation were 22.9% and 14.2% respectively.