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Effective absorption of SO2 by imidazole-based PILs with multiple active sites: Thermodynamic and mechanical studies
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  • Ping Liu,
  • Kaixing Cai,
  • Tianxiang Zhao,
  • Xiaomin Zhang
Ping Liu
Guizhou University School of Chemistry and Chemical Engineering

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Kaixing Cai
Guizhou University School of Chemistry and Chemical Engineering
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Tianxiang Zhao
Guizhou University School of Chemistry and Chemical Engineering, Guiyang, Guizhou, CN
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Xiaomin Zhang
Nanjing University
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In view of the environmental hazards caused by SO2, the development of efficient SO2 capture technology has important practical significance. In this work, a low viscosity protic ionic liquids containing imidazole, ether linkage, and tertiary amine structure, was synthesized by acid-base neutralization of tris(3,6-dioxaheptyl)amine (TMEA) and imidazole (Im) for SO2 absorption. The results showed that the solubility of SO2 in [TMEA][Im] reached 12.754 mol·kg-1 at 298.2 K and 100 kPa and the ideal selectivity of SO2/CO2(1/1) and SO2/H2S(1/1) are 141.6 and 11.8 at 100 kPa, respectively. Furthermore, [TMEA][Im] can be reused and the SO2 absorption performance was not significantly reduced after five cycles. In addition, the absorption of low-concentration SO2 (2000 ppm) in [TMEA][Im] was also tested. Further spectroscopic research and thermodynamic analysis suggested that the high SO2 uptake by [TMEA][Im] was caused by the synergistic effect of physical and chemical absorption.
21 Jul 2021Submitted to AIChE Journal
21 Jul 2021Submission Checks Completed
21 Jul 2021Assigned to Editor
11 Aug 2021Reviewer(s) Assigned
24 Sep 2021Editorial Decision: Revise Major
10 Oct 20211st Revision Received
13 Oct 2021Submission Checks Completed
13 Oct 2021Assigned to Editor
24 Oct 2021Reviewer(s) Assigned
19 Dec 2021Editorial Decision: Revise Minor
21 Dec 20212nd Revision Received
26 Dec 2021Submission Checks Completed
26 Dec 2021Assigned to Editor
04 Jan 2022Editorial Decision: Accept