The effect of ether functional group(s) in the cation, anion, and both of the ions in ionic liquids on physical absorption of CO 2 are revisited in the present work. The solubilities of CO 2 in ether functionalized ammonium and pyrrolidinium salts, [N 211MEE ][Tf 2 N], [Pyr 1MOM ][Tf 2 N], and [Pyr 1MOM ][FSA] were previously reported together with the corresponding alkyl analogues. In addition to such cation-modified ionic liquids, we investigate a new family of ether functionalized ionic liquids with alkoxy sulfates; [C 2 mim][C 1 (OC 2 ) 2 SO 4 ], [P 444ME ][C 6 SO 4 ], [P 444ME ][C 1 OC 2 SO 4 ], [P 444ME ] -[C 1 (OC 2 ) 2 SO 4 ], and [N 221ME ][C 1 (OC 2 ) 2 SO 4 ].The CO 2 solubility data on the molarity as well as the mole fraction scales are presented in a series of ether functionalized ILs with a brief overview of the previously reported results. It has become apparent that the introduction of an ether functional group in anions more effectively improves the CO 2 solubilities on both the mole fraction and molarity scales than that in cations. The effects of the cation, anion, and dual functionalization with ether groups on the physical solubility of CO 2 are discussed with the volumetric properties in terms of the molecular structures of ILs.
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