CO2 Solubility in Ether Functionalized Ionic Liquids on Mole Fraction and Molarity Scales

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• 作者：Mitsuhiro Kanakubo ; Takashi Makino ; Takayuki Taniguchi ; Toshiki Nokami ; Toshiyuki Itoh
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：February 1, 2016
• 年：2016
• 卷：4
• 期：2
• 页码：525-535
• 全文大小：519K
• ISSN：2168-0485

文摘

The effect of ether functional group(s) in the cation, anion, and both of the ions in ionic liquids on physical absorption of CO₂ are revisited in the present work. The solubilities of CO₂ in ether functionalized ammonium and pyrrolidinium salts, [N_211MEE][Tf₂N], [Pyr_1MOM][Tf₂N], 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; [C₂mim][C₁(OC₂)₂SO₄], [P_444ME][C₆SO₄], [P_444ME][C₁OC₂SO₄], [P_444ME][C₁(OC₂)₂SO₄], and [N_221ME][C₁(OC₂)₂SO₄]. The CO₂ 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 CO₂ 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 CO₂ are discussed with the volumetric properties in terms of the molecular structures of ILs.