Ionic liquids are considered as new absorbents with high solubility for separation of CO₂ from flue gases. In this study, the effect of an ionic liquid ([Bmim][BF₄]) on the absorption of CO₂ using polypropylene hollow fiber membrane contactors was studied. Aqueous solutions of ionic liquid and mixture of ionic liquid with methyldiethanolamine were applied as physical and chemical absorbents, respectively. The effects of different parameters including concentration of ionic liquid in water and aqueous solution of methyldiethanolamine as base fluids, liquid and gas flow rates, and flow direction were investigated. The results showed that a 25 wt% solution of ionic liquid can increase the absorption efficiency about 20% and 15% compared to pure water in co-current and counter-current flows, respectively. It was also observed that a mixture containing 20 wt% of ionic liquid and 10 wt% of methyldiethanolamine can improve the absorption capacity about 10% compared to a 10 wt% MDEA aqueous solution without ionic liquid.

离子液体被认为是具有高溶解度的新型吸收剂，用于从烟气中分离出CO ₂。在这项研究中，离子液体（[Bmim] [BF ₄ ]）对CO ₂吸收的影响用聚丙烯中空纤维膜接触器进行了研究。将离子液体的水溶液以及离子液体与甲基二乙醇胺的混合物分别用作物理和化学吸收剂。研究了不同参数的影响，包括水和甲基二乙醇胺水溶液作为基础液中离子液体的浓度，液体和气体的流速以及流向。结果表明，与纯水相比，在顺流和逆流中，25％（重量）的离子液体溶液可分别将吸收效率提高约20％和15％。还观察到，与没有离子液体的10重量％的MDEA水溶液相比，包含20重量％的离子液体和10重量％的甲基二乙醇胺的混合物可以将吸收能力提高约10％。