The Fischer-Tropsch (FT) reactor and hydrocracker, which are important elements of a synthetic liquid fuel process, are multi-phase reactors having gas-solid-liquid reactions involving H-2 and/or CO. To predict the reactor performance, it is therefore important for simulation models used in the techno-economic or feasibility studies of such processes to accurately capture the solubility of H-2 and CO in the reactant-product mixture. This poses challenges in terms of the asymmetric nature of the mixture and accurate characterization of the components involved. Using solubility experimental data and validated component characterization equations from literature, correlations to determine the Peng-Robinson binary interaction parameters and hence, predict the solubility of H-2 and CO are presented. These binary interaction parameter correlations are expressed as a function of the solvent carbon number and temperature. (C) 2012 Elsevier B.V. All rights reserved.