The mixture of ionic liquids (ILs) with a low viscous solvent such as tetraglyme (TGM) may be interesting to reach new absorbent formulations with improved performance in CO₂ capture technologies. In this work, CO₂ absorption by IL/TGM mixtures was analyzed by equilibrium and kinetic gravimetric measurements and packed column simulations in Aspen Plus. Four ILs with remarkable different absorbent properties were employed. The ILs 1-butyl-methylimidazolium tricyanomethanide ([Bmim][TCM]) and 1-butyl-methylimidazolium methylsulfate ([Bmim][MeSO₄]) present CO₂ physical absorption, with remarkably different viscosity values. On the other hand, the ILs trihexyltetradecylphosphonium 2-cyanopyrrolide ([P₆₆₆₁₄][CNPyr]) and1-butyl-methylimidazolium acetate ([Bmim][Acetate]) were selected as CO₂ chemical absorbents, being the former significantly less viscous. CO₂ absorption experiments were carried out in a magnetic suspension microbalance using a wide composition range of IL/TGM mixtures, measured at 303 K and at different pressures, from 1 up to 20 bar. The results were analyzed considering thermodynamics (CO₂ solubility in IL/TGM) and kinetics (CO₂ diffusivity in IL/TGM) features. ILs with physical absorption presented higher CO₂ solubilities and diffusivities when increasing TGM composition. In fact, the neat TGM shows higher CO₂ physical absorption capacity and rate than IL/TGM mixtures at any studied opeating conditions. In contrast, ILs with CO₂ chemical absorption generally present higher CO₂ absorption capacity than TGM/IL mixtures, but a certain amount of TGM improves drastically the CO₂ absortion kinetics with a slight decrease of the solubility. The simulation analysis of IL/TGM performance in the absorption column reveals that: i) TGM is better physical absorbent for CO₂ capture than IL/TGM mixtures and neat ILs; and ii) it is possible to select finest IL/TGM mixtures which minimize the solvent and energy expenses in CO₂ capture by chemical absorption.

离子液体（ILs）与低粘度溶剂（如四甘醇二甲醚（TGM））的混合物可能很有趣，以生产具有改进的CO ₂捕集技术性能的新型吸收剂配方。在这项工作中，通过Aspen Plus中的平衡和动力学重量分析以及填充柱模拟分析了IL / TGM混合物对CO _2的吸收。使用了四种具有明显不同吸收特性的IL。IL的1-丁基-甲基咪唑三氰胺（[Bmim] [TCM]）和1-丁基-甲基咪唑甲基硫酸盐（[Bmim] [MeSO ₄ ]）表现为CO ₂物理吸收，粘度值明显不同。另一方面，白介素三氰基_{十四烷基phosph2-}氰基吡咯化物（[P ₆₆₆₁₄选择[CNPyr]）和1-丁基甲基咪唑乙酸盐（[Bmim] [乙酸盐]）作为CO ₂化学吸收剂，前者的黏度明显较低。在磁悬浮微量天平中使用宽范围的IL / TGM混合物组成进行了CO ₂吸收实验，在303 K和1至20 bar的不同压力下进行了测量。分析结果时要考虑热力学（在IL / TGM中的CO ₂溶解度）和动力学（在IL / TGM中的CO ₂扩散性）特征。当增加TGM组成时，具有物理吸收的IL表现出更高的CO ₂溶解度和扩散性。实际上，纯净的TGM表现出更高的CO ₂在任何研究的使用条件下，其物理吸收能力和吸收速率均比IL / TGM混合物高。相反，具有CO ₂化学吸收的IL通常比TGM / IL混合物具有更高的CO ₂吸收能力，但是一定量的TGM可以显着改善CO ₂吸收动力学，但溶解度略有降低。在吸收塔中对IL / TGM性能的仿真分析表明：i）与IL / TGM混合物和纯净的IL相比，TGM对CO ₂捕获的物理吸收性更好。ii）可以选择最优质的IL / TGM混合物，以最大程度地减少通过化学吸收捕集CO _2所消耗的溶剂和能量。