PREDICTION OF GAS SOLUBILITIES IN PURE AND MIXED-SOLVENTS USING A GROUP-CONTRIBUTION METHOD

A new and simple model for predicting gas solubilities in pure and mixed solvents at low pressure and temperature is proposed. A method for predicting Henry's constants of single gases in mixed solvents from the corresponding binary data and introducing the volume fraction of molecules is presented. An extrapolation to pure solvents using a group contribution method is developed for seven gases (O2, N2, H-2, CO, CO2, CH4, C2H4). Good results are obtained in a wide variety of solvents and solvent mixtures (alkanes, alcohols, ketones, esters, ethers, aromatic compounds, cyclic compounds and water). This new model gives better results than the MHV2, GC-EOS, and Sander's models, with fewer adjustable parameters.