CO2 Solubility in 1,1,2,2-Tetrafluoroethanesulfonate Anion-Based Ionic Liquids: [EMIM][TFES], [BMIM][TFES], and [BNMIM][TFES]

• Published in: Journal of chemical and engineering data 2020-02, Vol.65 (2), p.617-627
• Main Authors: Yim, Joon-Hyuk, Park, Kwang Woo, Oh, Byung-Keun, Lim, Jong Sung
• Format: Article
• Language: English
• ISSN: 0021-9568; 1520-5134
• DOI: 10.1021/acs.jced.9b00833

The solubility of carbon dioxide (CO2) in three different ionic liquids (ILs): 1-ethyl-3-methylimidazolium 1,1,2,2-tetrafluoroethanesulfonate ([EMIM]­[TFES]), 1-butyl-3-methylimidazolium 1,1,2,2-tetrafluoroethanesulfonate ([BMIM]­[TFES]), and 1-benzyl-3-methylimidazolium 1,1,2,2-tetrafluoroethanesulfonate ([BNMIM]­[TFES]) were measured. Measurements were done at temperatures ranging from 303.2 to 373.2 K (323.2 to 373.2 K for [BNMIM]­[TFES]) at pressures from 0.80 to 36.80 MPa. Measured data show that pressure, temperature, and characteristics of cation of ILs ([EMIM], [BMIM], and [BNMIM]) affect its CO2 solubility. We determined the CO2 solubility of fixed CO2 mole fractions for three ionic liquids. Among the three ILs, CO2 solubility intensity was ranked [BMIM]­[TFES] > [EMIM]­[TFES] ≈ [BNMIM]­[TFES]. The Peng–Robinson equation of state, the conventional van der Waals one-fluid mixing rule, and the modified Lydersen–Joback–Reid method were used to correlate the experimental data. The average absolute deviations of pressure were 0.0164 for CO2 + [EMIM]­[TFES], 0.0361 for CO2 + [BMIM]­[TFES], and 0.0251 for CO2 + [BNMIM]­[TFES] systems.