Ionic liquid (IL) can not only serve as solvents to reduce carbon capture energy consumption, but also may activate the CO₂ absorption of amine solutions. Here, the absorption mechanism and kinetic modeling of IL-activated single and mixed amines were studied in wetted wall column. N-(2-aminoethyl) ethanolamine (AEEA) and N,N-diethylethanolamine (DEEA) were used as representatives to evaluate the IL activation effects on primary and tertiary amines. It was found that IL activated the reaction process of primary amine, but had no activation effect on tertiary amine. The activation energy of AEEA-IL-CO₂ was 22.2 kJ/mol, which was 21.0% lower than AEEA-CO₂. Kinetic modeling of IL-activated AEEA and mixed amines was established. Besides, the density functional theory calculations showed that IL can form hydrogen bonding and other interactions with AEEA and CO₂ to activate the absorption reaction, which can reduce 29.3% activation energy during the zwitterion formation stage.

中文翻译：

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离子液体活化混合胺的CO2吸收机理及动力学模型


离子液体(IL)不仅可以作为溶剂降低碳捕集能耗，还可以激活胺溶液的CO ₂吸收。在这里，研究了 IL 激活的单一胺和混合胺在湿壁柱中的吸收机制和动力学模型。以N-(2-氨基乙基)乙醇胺(AEEA)和N,N-二乙基乙醇胺(DEEA)为代表，评价IL对伯胺和叔胺的活化作用。结果发现IL对伯胺的反应过程有激活作用，但对叔胺没有激活作用。 AEEA-IL-CO ₂的活化能为22.2 kJ/mol，比AEEA-CO ₂低21.0%。建立了 IL 激活的 AEEA 和混合胺的动力学模型。此外，密度泛函理论计算表明，IL可以与AEEA和CO ₂形成氢键等相互作用来激活吸收反应，在两性离子形成阶段可以降低29.3%的活化能。