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 (Im), ether linkage, and tertiary amine structure was synthesized by acid–base neutralization of tris(3,6-dioxaheptyl)amine (TMEA) and 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 1 bar and the ideal selectivity of SO₂/CO₂ (1/1) is 141.7 at 1 bar. 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.

中文翻译：

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具有多个活性位点的咪唑基质子离子液体对 SO2 的有效吸收：热力学和力学研究

_{针对SO 2}造成的环境危害，开发高效的SO ₂捕集技术具有重要的现实意义。在这项工作中，通过酸碱中和三(3,6-二氧杂庚基)胺(TMEA)和Im以吸收SO ₂合成了一种含有咪唑(Im)、醚键和叔胺结构的低粘度质子离子液体. 结果表明，SO ₂在[TMEA][Im]中的溶解度在298.2 K和1 bar时达到12.754 mol kg ^{-1 ，在1 bar时SO} ₂ /CO ₂ (1/1)的理想选择性为141.7。此外，[TMEA][Im] 可以重复使用，SO ₂五次循环后吸收性能没有显着降低。此外，还测试了[TMEA][Im]中低浓度SO _{2 (2000 ppm)的吸收。}进一步的光谱研究和热力学分析表明，[TMEA][Im]对SO ₂的高吸收是由物理和化学吸收的协同作用引起的。