Abstract
The solubilities and selectivities for CO 2, N 2 and CH 4 in ionic liquid were predicted using a COSMO based activity coefficient model, COSMO-SAC method. The 1-alkyl-3-methylimidazolium cations were focused in this work. The anion species include tetrafluoroborate [BF 4], hexafluorophosphate [PF 6], triflate [OTf], dicyanamide [dca] and bis(trifluoromethane)-sulfonimide [Tf 2N]. The predicted results of the solubilities of CO 2 in the ionic liquids by COSMO-SAC method are in agreement with the experimental data within the averaged deviation of 0.0017 in mole fraction. The predicted results of selectivities for CO 2/N 2 and CO 2/CH 4 represent the effects of anion species qualitatively. Permeability through supported liquid membrane can be presented by solubility and diffusion coefficients in the liquid. The permeabilities of CO 2 through the ionic liquid membranes were also predicted by a solution-diffusion model with COSMO-SAC method. The predicted results of the CO 2 permeabilities through the ionic liquids represent the experimental data within the order of the permeabilities.
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