Mulk Waqad Ul, Hassan Shah Mansoor Ul, Shah Syed Nasir, Zhang Qi-Jun, Khan Asim Laeeq, Sheikh Mahdi, Younas Mohammad, Rezakazemi Mashallah
Department of Mechanical Engineering, Faculty of Mechanical and Aeronautical Engineering, University of Engineering and Technology, Taxila, 47080, Rawalpindi, Pakistan; Department of Mechanical Engineering, Universiti Teknologi Petronas, 32610 Bandar Seri Iskandar, Perak Darul Ridzuan, Malaysia.
Department of Chemical Engineering, Faculty of Mechanical, Chemical, and Industrial Engineering, University of Engineering and Technology, Peshawar, 25120, Pakistan.
Environ Res. 2023 Nov 15;237(Pt 1):116879. doi: 10.1016/j.envres.2023.116879. Epub 2023 Aug 12.
The main obstacles in adopting solvent-based CO capture technology from power plant flue gases at the industrial scale are the energy requirements for solvent regeneration and their toxicity. These challenges can be overcome using new green and more stable ionic liquids (ILs) as solvents for post-combustion CO capture. In the current study, tributyl-tetradecyl-phosphonium chloride [P][Cl] as an IL, was immobilized on hydrophobic porous supports of polypropylene (PP), polyvinylidene fluoride (PVDF), and polytetrafluoroethylene (PTFE) at 298 ± 3 K and pressures up to 2 bar. The surface morphology indicated homogenous immobilization of the IL on the membrane support. Supported ionic liquid membranes (SILMs) were tested for CO permeability and CO/N selectivity. None of the SILMs exhibited IL leaching up to 2 bar. The PTFE-based SILM performed better than other supports with minimum loss in water contact angle (WCA) and achieved good antiwetting with a maximum CO permeability and selectivity over N of 2300 ± 139 Barrer and 31.60 ± 2.4, respectively. This work achieves CO permeability about two-fold more than other works having CO/N selectivity range of 25-35 in similar SILMs. The diffusivity of CO and N in [P][Cl] was measured as 3.64 ± 0.18 and 2.01 ± 0.09 [10 cm s] and CO and N solubility values were 9.79 ± 0.47 and 0.19 ± 0.001 [10 cm(STP) cm cmHg], respectively. The high values of Young's modulus and tensile strength of the PTFE support-based SILM (234 ± 12 MPa and 6.07 ± 0.31 MPa, respectively) indicated the long-term application of SILM in flue gas separation. The results indicated phosphonium chloride-based ILs could be better solvent candidates for CO removal from large volumes of flue gases than amine-based ILs.
在工业规模上采用基于溶剂的电厂烟道气二氧化碳捕集技术的主要障碍是溶剂再生的能量需求及其毒性。使用新型绿色且更稳定的离子液体（ILs）作为燃烧后二氧化碳捕集的溶剂，可以克服这些挑战。在当前的研究中，将氯化三丁基十四烷基鏻[P][Cl]作为一种离子液体，在298±3K和高达2巴的压力下固定在聚丙烯（PP）、聚偏氟乙烯（PVDF）和聚四氟乙烯（PTFE）的疏水多孔载体上。表面形态表明离子液体在膜载体上均匀固定。对负载型离子液体膜（SILMs）进行了二氧化碳渗透率和二氧化碳/氮气选择性测试。在高达2巴的压力下，没有一种负载型离子液体膜出现离子液体浸出。基于聚四氟乙烯的负载型离子液体膜表现优于其他载体，水接触角（WCA）损失最小，并实现了良好的抗润湿性，二氧化碳渗透率最高，对氮气的选择性分别为2300±139巴雷尔和31.60±2.4。这项工作实现的二氧化碳渗透率比其他在类似负载型离子液体膜中二氧化碳/氮气选择性范围为25 - 35的工作高出约两倍。在[P][Cl]中二氧化碳和氮气的扩散系数分别测得为3.64±0.18和2.01±0.09[10⁻⁶cm² s⁻¹]，二氧化碳和氮气的溶解度值分别为9.79±0.47和0.19±0.001[10⁻³cm³(STP) cm⁻² cmHg⁻¹]。基于聚四氟乙烯载体的负载型离子液体膜的杨氏模量和拉伸强度的高值（分别为234±12兆帕和6.07±0.31兆帕）表明负载型离子液体膜在烟道气分离中的长期应用前景。结果表明，基于氯化鏻的离子液体可能比基于胺的离子液体更适合作为从大量烟道气中去除二氧化碳的溶剂候选物。
