Two types of predictive thermodynamic models, i.e., the UNIFAC model and GCLF EOS (group contribution lattice fluid equation of state), were applied to predict the solubility of SO 2 in ionic liquids (ILs). The group interaction parameters were estimated by correlating the solubility data of SO 2 in ILs exhaustively collected from the articles published until July 2015. It was verified that both the UNIFAC model and GCLF EOS could be used for predicting the solubility of SO 2 in ILs, but the UNIFAC model gives results that are better than those of GCLF EOS. The UNIFAC model then was used to identify the structure–property relation for SO 2 solubility and selectivity of CO 2 to SO 2, whereas GCLF EOS was used to investigate the volume expansivity of ILs upon the addition of SO 2 . The results showed that volume expansivity is independent of the different combinations of cations and anions and exhibits a linear relationship with SO 2 solubility in ILs.
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Dai et al. (2015) studied this question.
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