In the capture of CO₂ through the absorption process, selecting the absorbent blend system based on the absorption kinetics is crucial. This study focuses on the kinetic investigation of two new lab-synthesized dual-functionalized ionic liquids (DFILs), namely, T-Im and D-Im, which were employed as promoters in low-reactive aqueous methyldiethanolamine (MDEA) solvent for making a highly CO₂ absorbing blend system. Then, CO₂ absorption kinetic performance of these blends was assessed across a temperature range of 303–328 K. The results indicated a significant enhancement in the initial absorption rate with an increase in the DFIL concentration (2.5–10 wt %). The overall rate constant (k_ov) values were higher in the capture using these DFILs compared to those with the reported promoters such as monoethanolamine (MEA), diethanolamine (DEA), and piperazine (PZ). The absorption rate followed the Arrhenius law with an activation energy of 25.61 kJ/mol for T-Im/MDEA and 24.87 kJ/mol for D-Im/MDEA, respectively. ¹³C NMR characterization confirmed that carbamate formation increased with an increasing T-Im concentration in the blend. The rate kinetic was modeled using the termolecular, zwitterion, and base-catalyzed hydration mechanisms. The rate equations based on the zwitterion mechanism for the T-Im and D-Im blended absorbents were k2,T−Im=2.242×109exp(−3531.09T)$k_{2,\mathrm{T}-\mathrm{I}\mathrm{m}}=2.242\times {10}^9\exp \left(\frac{-3531.09}{T}\right)$ and k2,D−Im=1.11×109exp(−3504.22T)$k_{2,\mathrm{D}-\mathrm{I}\mathrm{m}}=1.11\times {10}^9\exp \left(\frac{-3504.22}{T}\right)$, respectively. The accuracy of the rate kinetic models expressed in terms of average absolute deviation (AAD) was found to be in the range of 4 to 8%.

中文翻译：

---

新型双功能离子液体混合物甲基二乙醇胺吸收剂中二氧化碳捕获的动力学研究和建模

在通过吸收过程捕获CO ₂时，根据吸收动力学选择吸收剂混合物系统至关重要。本研究重点研究两种新型实验室合成的双功能离子液体 (DFIL)（即 T-Im 和 D-Im）的动力学研究，它们在低反应性水性甲基二乙醇胺 (MDEA) 溶剂中用作促进剂，用于制备高CO ₂吸收共混体系。然后，在 303–328 K 的温度范围内评估这些共混物的CO ₂吸收动力学性能。结果表明，随着 DFIL 浓度 (2.5–10 wt%) 的增加，初始吸收率显着提高。与使用单乙醇胺 (MEA)、二乙醇胺 (DEA) 和哌嗪 (PZ) 等已报道的启动子的捕获相比，使用这些 DFIL 捕获的总体速率常数 ( k _ov ) 值更高。吸收速率遵循阿累尼乌斯定律，T-Im/MDEA 的活化能为 25.61 kJ/mol，D-Im/MDEA 的活化能为 24.87 kJ/mol。¹³ C NMR表征证实氨基甲酸酯的形成随着共混物中T-Im浓度的增加而增加。使用术语分子、两性离子和碱催化水合机制对速率动力学进行建模。基于两性离子机理的 T-Im 和 D-Im 混合吸收剂的速率方程为k 2 , T − I m = 2.242 × 10 9 exp ( − 3531.09)​$k_{2,\mathrm{T}-\mathrm{I}\mathrm{m}}=2.242\times {10}^9\exp \left(\frac{-3531.09}{T}\right)$和k 2 , D − I m = 1.11 × 10 9 exp ( − 3504.22)​$k_{2,\mathrm{D}-\mathrm{I}\mathrm{m}}=1.11\times {10}^9\exp \left(\frac{-3504.22}{T}\right)$， 分别。以平均绝对偏差 (AAD) 表示的速率动力学模型的准确性被发现在 4% 至 8% 的范围内。