Carbon Dioxide Solubility in the Homologous 1-Alkyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide Family

Abstract

The high-pressure phase behavior of the binary system CO 2 + 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide was determined experimentally by a synthetic method. Bubble points were measured for mixtures of various carbon dioxide concentrations within a temperature and pressure range of (310 to 450) K and (0.5 to 14) MPa, respectively. The results were compared with solubility data obtained by three other research laboratories using different phase equilibria measuring techniques, and good agreement was observed in every case. The effect of the cation alkyl chain length was also investigated by comparing CO 2 solubility in four homologous members of the 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide family in which the alkyl was either ethyl, butyl, hexyl, or octyl. It was shown that CO 2 solubility increases almost linearly with increasing alkyl chain length.

A New Approach to CO2Capture and Conversion Using Imidazolium Based-Ionic Liquids as Sorbent and Catalyst

“…It was observed that the reaction time reduction from 6 up to 2 h (entry [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], provided a decreases in yield, curiously the increase in reaction time from 6 to 8 h (entry 4-21) decreases the yield. The reaction time of 6 h was ideal for this the system.…”

“…11,15 Regarding CO 2 capture, the imidazolium cations allied to fluoroalkyl anions stand as very effective systems for CO 2 absorption. 17,18 Nevertheless, in relation to the reaction of CO 2 conversion in cyclic carbonates, the results reported in the literature are contradictory in respect to the activity of ionic liquids combined to fluoroalkyl anions.…”

Thermodynamic modeling of CO2 solubility in ionic liquid ([C n -mim] [Tf2N]; n=2, 4, 6, 8) with using Wong-Sandler mixing rule, Peng-Rabinson equation of state (EOS) and differential evolution (DE) method

“…The experimental results found in the literature for solubility of CO 2 in the ionic liquids [C n -mim][Tf 2 N] (n=2, 4,6,8) show that CO 2 gives very high solubility in ionic liquids at lower pressures, while the equilibrium pressure increases very steeply at higher concentrations of CO 2 . The solubility of CO 2 in the ionic liquids decreases with an increase in temperature.…”

“…To select an efficient ionic liquid for use as a gas separation medium, it is necessary to know the solubility of the gas in ionic liquid phase. Thus, phase equilibrium properties of carbon dioxide in ILs are required [2][3][4][5][6]. These properties must be either experimentally obtained or semi-empirically correlated.…”

“…et al studied the solubility of some gases in [bmim] [PF6 ] at different temperatures of 283, 298 and 323 K by means of gravimetric microbalance[11]. Shariati et al andKroon et al studied the high pressure phase behavior of binary mixtures consisting of carbon dioxide and imadazolium-based ionic liquids (1-alkyl-3-methylimidazolium tetrafluoroborate and 1-alkyl-3-methylimidazolium hexafluorophosphate) over a wide range of solute concentrations and at pressure up to about 100 MPa[12][13][14][15].…”