Solubility measurements of sulfur compounds in supercritical fluids are required in order to determine the feasibility of supercritical extraction for removing them from gasoline and diesel fuel. In this work, solubility of thiophene in CO2 and in CO2 + 1-propanol mixtures were measured from 313 to 363 K using an apparatus based on the static-analytical method. Vapor-liquid equilibria (VLE) data of binary mixtures were fitted to the Peng-Robinson equation of state (EoS) with classical mixing rules. The binary interaction parameters (k(ij)) obtained were used to predict the VLE data of ternary systems. The calculated values given by this simple model agree well to the experimental data. © 2004 Elsevier B.V. All rights reserved.