This study demonstrates the coupling of Ionic liquids (ILs) with a membrane contactor for post-combustion CO₂ capture at moderate pressures and temperatures. ILs 1-ethyl-3-methylimidazolium methyl sulfate([emim][MeSO₄]), 1-ethyl-3-methylimidazolium dicyanamide([emim][DCA]), 1-ethyl-3-methylimidazolium ethyl sulfate([emim][EtSO₄]) and 1-ethyl-3-methylimidazolium acetate ([emim][Ac]) were selected due to their high thermal stability, moderate viscosity and surface tension, as well as high CO₂ solubility. No wetting conditions were confirmed for the polypropylene membrane by measuring contact angle, liquid entry pressure (LEP) and SEM of fiber surface before and after the operation. ILs were recirculated in the setup until reaching pseudo-steady-state. All four ILs were able to capture a substantial amount of CO₂ during the specified operation time. Initially, very high values of CO₂ mass transfer flux and experimental overall mass transfer coefficient were obtained which further decreased with operation time and reached a nearly constant value at pseudo-steady-state. Effect of CO₂ loading of the ILs and temperature on enhancement factor and first order rate constant were evaluated. The absorption behavior and kinetics were strongly influenced by the CO₂ concentration in the ILs, which divides the absorption process in two steps; an initial faster absorption at the gas-liquid interface and later slower absorption in the bulk of the IL. Finally, a pseudo-steady-state modelling approach was implemented and validated.

这项研究证明了离子液体（ILs）与膜接触器的耦合，用于在中等压力和温度下燃烧后捕获CO ₂。ILs 1-乙基-3-甲基咪唑甲基硫酸盐（[emim] [MeSO ₄ ]），1-乙基-3-甲基咪唑甲基二氰胺（[emim] [DCA]），1-乙基-3-甲基咪唑硫酸乙酯（[emim]选择[EtSO ₄ ]）和乙酸1-乙基-3-甲基咪唑鎓盐（[emim] [Ac]）是因为它们具有高的热稳定性，适度的粘度和表面张力以及高的CO ₂溶解度。通过测量操作前后纤维表面的接触角，液体进入压力（LEP）和SEM，没有确认聚丙烯膜的润湿条件。IL在设置中进行再循环，直到达到伪稳态为止。在指定的操作时间内，所有四个IL均能够捕获大量的CO ₂。最初，获得了很高的CO ₂传质通量和实验性总传质系数，它们随着工作时间的增加而进一步降低，并在准稳态下达到接近恒定的值。CO _2的作用评估了IL的负载量和温度对增强因子和一级速率常数的影响。IL中的CO ₂浓度强烈影响吸收行为和动力学，这将吸收过程分为两个步骤。最初在气液界面吸收较快，后来在大部分IL中吸收较慢。最后，实现并验证了伪稳态建模方法。