Eight sets of experimental P-T-x data were determined for 2-propanol-1,4-dioxane mixtures using an ebulliometer. Five popular activity coefficient models and a coexistence equation have been used to correlate each set of data through different optimization methods to obtain values of the vapor phase compositions and excess Gibbs free energy. The results of these correlations have been compared. An attempt was made to evaluate the group interaction parameters for alcohol-1,4-dioxane mixtures to improve VLE predictions using the UNIFAC method. (C) 1998 Elsevier Science B.V. All rights reserved.