Abstract
Recently, the use of ionic liquids (ILs) for carbon capture and separation processes has gained great interest by many researchers due to the high solubility of CO2 in ILs. In the present work, solubility measurements of CO2 in the novel IL 1-n-butyl-3-methylimidazolium nonafluorobutylsulfonate [C4mim][CF3CF2CF2CF2SO3] were performed with a high-pressure view-cell technique in the temperature range from 293.15 to 343.15 K and pressures up to about 4.2 MPa. For comparison, solubilities of H2, N2, and O2 in the IL were also measured at 323.15 K via the same procedure. The Krichevsky-Kasarnovsky equation was employed to correlate the measured solubility data. Henry’s law constants, enthalpies, and entropies of absorption for CO2 in the IL were also determined and presented. The CO2 solubility in this IL was compared with other ILs sharing the same cation. It was shown that the solubility of CO2 in these ILs follows the sequence: [C4mim][CF3CF2CF2CF2SO3] ≈ [C4mim][Tf2N] > [C4mim][CF3CF2CF2COO] > [C4mim][BF4], and the solubility selectivity of CO2 relative to O2, N2, and H2 in [C4mim][CF3CF2CF2CF2SO3] was 8, 16, and 22, respectively. Furthermore, this IL is regenerable and exhibits good stability. Therefore, the IL reported here would be a promising sorbent for CO2.
Highlights
The growing CO2 concentration in the atmosphere compels the scientific community to improve current carbon capture and storage (CCS) technologies, such as membrane-based separation, adsorption, and absorption [1,2,3]
The solubility selectivity of [C4mim][CF3CF2CF2CF2SO3] for CO2/O2, CO2/N2 and CO2/H2 was calculated to be 8, 16, and 22, respectively, which is consistent with the results reported for the other fluorinated ionic liquids (ILs) in the literature [38]
We reported the solubilities of CO2, O2, N2, and H2 in [C4mim][CF3CF2CF2CF2SO3]
Summary
The growing CO2 concentration in the atmosphere compels the scientific community to improve current carbon capture and storage (CCS) technologies, such as membrane-based separation, adsorption, and absorption [1,2,3] For this purpose, researchers are extensively involved in the development of novel materials for energy and environmental applications. Researchers are extensively involved in the development of novel materials for energy and environmental applications Among these materials, ionic liquids (ILs) have gained increasing interest because of their outstanding properties over traditional solvents, such as negligible vapor pressures, high thermal and chemical stability, strong solubility capacity, and good recyclability [4]. A comparison was made for the solubilities of CO2 in the studied IL and in the homologues of imidazolium salts to determine the anionic effect
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