Solubility of CO₂ in aqueous mixtures of monoethanolamine and dicyanamide-based ionic liquids

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• 作者：Fan Xu ; Hongshuai Gao ; Haifeng Dong ; Zhanli Wang ; Xiangping Zhang ; Baozeng Ren ; Suojiang Zhang
• 关键词：Ionic liquids ; Monoethanolamine ; CO2 absorption ; Viscosity
• 刊名：Fluid Phase Equilibria
• 出版年：15 March, 2014
• 年：2014
• 卷：365
• 期：Complete
• 页码：80-87
• 全文大小：666 K

文摘

Two low viscous ionic liquids (ILs), 1-(2-hydroxyethyl)-3-methyl-imidazolium dicyanamide ([C₂OHmim][DCA]) and 1-butyl-3-methylimidazolium ([Bmim][DCA]) were selected to mixed with aqueous 30 wt% monoethanolamine (MEA) for CO₂ absorption. The solubility of CO₂ in the aqueous mixtures of MEA + ILs was measured over a range of CO₂ partial pressure of 10-800 kPa and ILs concentrations from 10 to 50 wt% at 313.15 K and 333.15 K. Correlations of solubility as a function of CO₂ partial pressure have been conducted with deviation of 卤1.5%. Moreover, the density and viscosity of pure ILs and MEA + ILs + H₂O systems with different IL mass fractions were measured at temperature varying from 293.15 to 333.15 K.