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- In relation to this article, we declare that there is no conflict of interest.
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Received August 15, 2023
Accepted January 17, 2024
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Exploring the Eff ect of Diff erent Anions and Cations on the Solubility of CO 2 in Nitrile Imidazolium-Based Ionic Liquids with Sulfonated-Based Anions
Abstract
The eff ect of diff erent cations and anions on the CO 2 solubility in ionic liquids was investigated using a systematic approach
in the current work. Four ionic liquids (ILs) containing the same cation ([C 2 CN Bim]) were synthesized, each incorporating
a diff erent anion (DDS, BS TFMS, and DOSS). In addition, four ILs with diff erent cations ([C 2 CN Bim], [C 2 CN Him],
[C 2 CN Oim], and [C 2 CN Dim]) were prepared, all containing the same anion (DOSS). Then, these ILs were characterized
and utilized to determine how various cations and anions infl uence CO 2 solubility. The prepared ILs were characterized
using NMR and elemental analysis. Impurities, such as moisture and halide content were also determined. The CO 2 solubility
was studied using the gravimetric method (MSB) at pressures of 1, 5, 10, 15, and 20 bar. An investigation was also
conducted to examine the infl uence of temperature on the solubility of CO 2 in [C 2 CN Dim] [DOSS]. Henry’s law constants
were calculated along with the thermodynamic properties such as standard enthalpy, entropy, and Gibbs free energy (Δ H 0 ,
Δ S 0 , ΔG 0 ). In addition, the CO 2 /CH 4 solubility selectivity was determined.
