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The non-volatile nature of ionic liquids (ILs) has opened up a possibility to replace conventional solvents in CO2 recovery processes.Experimental data for the solubility carbon dioxide in various ILs have been collected over the last couple of decades.However,the number of possible combination of ionic liquids is almost infinite,and thus to find an ideal IL,molecular design methods should be developed along with experiments [1-3].In this work,a procedure to predict the solubility of carbon dioxide in ILs were developed and compared with experimental data.The proposed procedure combines the predictive quantum-mechanical calculation (COSMO-RS method) [4] with equation of state based on lattice fluid theory [5].Henrys law constants are used as a bridge between two theoretical expressions.The energy parameters of the lattice fluid equation of state are correlated with the Henrys law constants calculated firom COSMO therm program.Using the energy parameters obtained using the similar anions,predicted solubilities for ILs with different alkyl chain length cations are compared with experimental data.