{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T00:56:21Z","timestamp":1760057781504,"version":"build-2065373602"},"reference-count":16,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2025,2,20]],"date-time":"2025-02-20T00:00:00Z","timestamp":1740009600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"the Faculty of Graduate Studies and Research at the University of Regina","award":["2024-05070"],"award-info":[{"award-number":["2024-05070"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>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] &gt; [IL-3] &gt; [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\u2019s 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.<\/jats:p>","DOI":"10.3390\/molecules30050984","type":"journal-article","created":{"date-parts":[[2025,2,20]],"date-time":"2025-02-20T06:10:21Z","timestamp":1740031821000},"page":"984","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Carbon Dioxide Selectivity over Ethane in Promising Bis Tri (Fluoromethylsulfonyl) Imide-Based Ionic Liquids"],"prefix":"10.3390","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-3542-9099","authenticated-orcid":false,"given":"Eric","family":"Quaye","sequence":"first","affiliation":[{"name":"Industrial Systems Engineering, University of Regina, Regina, SK S4S 0A2, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8016-1693","authenticated-orcid":false,"given":"Amr","family":"Henni","sequence":"additional","affiliation":[{"name":"Industrial Systems Engineering, University of Regina, Regina, SK S4S 0A2, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ezeddin","family":"Shirif","sequence":"additional","affiliation":[{"name":"Energy Systems Engineering, University of Regina, Regina, SK S4S 0A2, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,2,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1016","DOI":"10.1016\/j.energy.2022.126280","article-title":"Can third-party market cooperation solve the dilemma of emissions reduction? 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[Master\u2019s Thesis, University of Regina]."}],"container-title":["Molecules"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1420-3049\/30\/5\/984\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,9]],"date-time":"2025-10-09T16:38:43Z","timestamp":1760027923000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1420-3049\/30\/5\/984"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,2,20]]},"references-count":16,"journal-issue":{"issue":"5","published-online":{"date-parts":[[2025,3]]}},"alternative-id":["molecules30050984"],"URL":"https:\/\/doi.org\/10.3390\/molecules30050984","relation":{},"ISSN":["1420-3049"],"issn-type":[{"type":"electronic","value":"1420-3049"}],"subject":[],"published":{"date-parts":[[2025,2,20]]}}}