酰亚胺
离子液体
选择性
二氧化碳
化学
离子键合
有机化学
催化作用
离子
作者
Eric Quaye,Amr Henni,Ezeddin Shirif
出处
期刊:Molecules
[Multidisciplinary Digital Publishing Institute]
日期:2025-02-20
卷期号:30 (5): 984-984
标识
DOI:10.3390/molecules30050984
摘要
This research addresses the critical challenge of CO2 capture by exploring innovative ways to avoid ethane (C2H6) co-absorption in natural gas sweetening operations. The solubility of Ethane (C2H6) was measured in three ionic liquids (ILs) with similar anions, 1-decyl-3-methyl imidazolium bis (trifluoro methylsulfonyl imide) [IL-1], 1-hexadecyl-3-methylimidazolium bis (trifluoro methylsulfonyl imide) [IL-2], and triethytetra-decyl ammonium bis (trifluoromethylsulfonyl imide) [IL-3]. The solubility experiments were investigated at 303.15 K and 343.15 K with pressures reaching 1.2 MPa. Among the ILs, [IL-2] exhibited the highest ethane absorption capacity due to its extended alkyl chain. The Peng-Robinson equation of state (PR-EoS) and three (3) distinct mixing rules provided robust correlations for the solubility data. Results demonstrate the inferior performance of [IL-1], [IL-2], and [IL-3] compared to Selexol/Genosorb 1753. The selectivity of Ethane (C2H6) over CO2 was determined, with the overall selectivity ranking as follows: [IL-1] > [IL-3] > [IL-2]. A comparison of these selectivity values with published IL data indicated that these three ILs are most effective when used in applications targeting CO2 capture in the absence of Ethane (C2H6), such as in the case of flue gas. They will most probably be used with an amine blend. Additionally, the Enthalpy and entropy of absorption provided valuable insights, demonstrating Ethane's weaker interactions and lower solubility than CO2. These findings emphasize the critical role of IL structure in determining ethane solubility and highlight the potential of customized ILs for optimizing gas-separation processes.
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