Abstract
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 30wt% 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 10–800kPa and ILs concentrations from 10 to 50wt% at 313.15K and 333.15K. Correlations of solubility as a function of CO2 partial pressure have been conducted with deviation of ±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 333.15K.
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