AN ANALYSIS OF THE UNIFAC-TYPE GROUP-CONTRIBUTION MODELS AT THE HIGHLY DILUTE REGION .2. EMPIRICAL IMPROVEMENTS WITH APPLICATION TO WATER HYDROCARBON MIXTURES/

To overcome the limitations of the existing UNIFAC-type group-contribu tion models presented in part 1, two empirical approaches are presente d. They both involve adjustment of the pure-compound parameters of the compounds involved which, while reducing the general character of the group-contribution approach, can lead to very satisfactory results wh en applicable. Such an approach is successfully applied to the correla tion and prediction of mutual solubility data in water/hydrocarbon mix tures.