Carbon dioxide uptake from natural gas by binary ionic liquid-water mixturesCCDC 1055905 and 1055906. For crystallographic data in CIF or other electronic format see DOI: 10.1039/c5gc00720h

Carbon dioxide solubility in a set of carboxylate ionic liquids formulated with stoicheiometric amounts of water is found to be significantly higher than for other ionic liquids previously reported. This is due to synergistic chemical and physical absorption. The formulated ionic liquid/water mixtures show greatly enhanced carbon dioxide solubility relative to both anhydrous ionic liquids and aqueous ionic liquid solutions, and are competitive with commercial chemical absorbers, such as activated N -methyldiethanolamine or monoethanolamine. Carbon dioxide solubility in a set of carboxylate ionic liquids formulated with stoicheiometric amounts of water is found to be significantly higher than for other ionic liquid systems previously reported.