Anthony Jennifer L, Anderson Jessica L, Maginn Edward J, Brennecke Joan F
Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA.
J Phys Chem B. 2005 Apr 7;109(13):6366-74. doi: 10.1021/jp046404l.
This work presents the results of solubility measurements for a series of gases in 1-n-butyl-3-methyl imidazolium tetrafluoroborate and 1-n-butyl-3-methyl imidazolium bis(trifluoromethylsulfonyl) imide. The gases considered include benzene, carbon dioxide, nitrous oxide, ethylene, ethane, oxygen, and carbon monoxide. Carbon dioxide and oxygen solubilities are also reported in methyl-tributylammonium bis(trifluoromethylsulfonyl) imide, butyl-methyl pyrrolidinium bis(trifluoromethylsulfonyl) imide, and tri-isobutyl-methyl phosphonium p-toluenesulfonate. We report the associated Henry's constants and enthalpies and entropies of absorption. In general, benzene, followed by carbon dioxide and nitrous oxide, have the highest solubilities and strongest interactions with the ionic liquids, followed by ethylene and ethane. Oxygen had very low solubilities and weak interactions. Carbon monoxide had a solubility below the detection limit of our apparatus. Ionic liquids with the bis(trifluoromethylsulfonyl) imide anion had the largest affinity for CO(2), regardless of whether the cation was imidazolium, pyrrolidinium, or tetraalkylammonium. These results suggest that the nature of the anion has the most significant influence on the gas solubilities.
这项工作展示了一系列气体在1-正丁基-3-甲基咪唑四氟硼酸盐和1-正丁基-3-甲基咪唑双（三氟甲基磺酰）亚胺中的溶解度测量结果。所考虑的气体包括苯、二氧化碳、一氧化二氮、乙烯、乙烷、氧气和一氧化碳。还报告了二氧化碳和氧气在甲基三丁基铵双（三氟甲基磺酰）亚胺、丁基甲基吡咯烷双（三氟甲基磺酰）亚胺和三异丁基甲基鏻对甲苯磺酸盐中的溶解度。我们报告了相关的亨利常数以及吸收焓和熵。一般来说，苯的溶解度最高，与离子液体的相互作用最强，其次是二氧化碳和一氧化二氮，然后是乙烯和乙烷。氧气的溶解度非常低，相互作用较弱。一氧化碳的溶解度低于我们仪器的检测限。无论阳离子是咪唑鎓、吡咯烷鎓还是四烷基铵，含有双（三氟甲基磺酰）亚胺阴离子的离子液体对CO₂的亲和力最大。这些结果表明，阴离子的性质对气体溶解度的影响最为显著。
