Porous asymmetric polyetherimide (PEI) hollow fiber membranes with various non-solvent additives, e.g. lithium chloride, methanol and phosphoric acid (PA) were prepared for CO₂ absorption and stripping process in a membrane contractor. The PEI membranes were characterized via gas permeation, liquid entry pressure of water (LEPw), contact angle and field emission scanning electronic microscopy analysis. The CO₂ absorption and stripping performance was evaluated via the membrane contactor system. Addition of non-solvent additives increased the LEPw and membrane porosity of the PEI membrane with the formation of various membrane microstructures and contact angles. Absorption test was performed at 40 °C showed that the PEI–PA membrane produced the highest absorption flux of 2.7 × 10⁻² mol m⁻² s⁻¹ at 0.85 m s⁻¹ of liquid velocity. Further testing on PEI–PA membrane was conducted on CO₂ stripping at 60 °C, 70 °C to 80 °C and the results indicated that the stripping flux was lower compared to the absorption flux. Stripping tests at 80 °C produced the highest stripping flux which might due to the increase in equilibrium partial pressure of CO₂ in the liquid absorbent. Modification of PEI membrane via incorporation of additive can enhanced the performance of a membrane contactor via increasing the absorption and stripping flux.

中文翻译：

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用于膜接触器应用中二氧化碳吸收和汽提的聚醚酰亚胺中空纤维膜

制备了具有各种非溶剂添加剂（例如氯化锂、甲醇和磷酸（PA））的多孔不对称聚醚酰亚胺（PEI）中空纤维膜，用于膜承包商中的CO ₂吸收和汽提过程。通过气体渗透、水的液体进入压力 (LEPw)、接触角和场发射扫描电子显微镜分析来表征 PEI 膜。CO ₂吸收和剥离性能通过以下方法评估膜接触器系统。添加非溶剂添加剂增加了PEI膜的LEPw和膜孔隙率，形成了各种膜微结构和接触角。在 40 °C 下进行的吸收测试表明，PEI-PA 膜在 0.85 ms ^-1的液体速度下产生了 2.7 × 10 ^-2 mol m ^-2 s ^{-1的最高吸收通量。}_{PEI-PA 膜在 60°C、70°C 到 80°C 下对 CO 2}进行了进一步测试，结果表明，与吸收通量相比，剥离通量较低。80 °C 的汽提试验产生了最高的汽提通量，这可能是由于 CO _{2平衡分压的增加}在液体吸收剂中。通过掺入添加剂对 PEI 膜进行改性可以通过增加吸收和剥离通量来提高膜接触器的性能。