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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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Abstract

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.

Peer review status:UNDER REVIEW

21 Jul 2021Submitted to AIChE Journal
21 Jul 2021Assigned to Editor
21 Jul 2021Submission Checks Completed
11 Aug 2021Reviewer(s) Assigned