Abstract Supported ionic liquid membranes (SILMs) constitute a radical advance in olefin/paraffin separation membranes. Unfortunately, the applications of SILMs are vastly hindered by low carrier efficiency. Herein, SILMs with high carrier efficiency via strong hydrogen-bond basicity were designed to carry out efficient ethylene/ethane separation. The strong hydrogen-bond basicity of ILs not only endowed the membranes with high carrier concentration, but also effectively favored for the good disassociation of carrier to form solvated free ions through coordinative interactions between IL and carrier, which greatly increased the number of carrier and enhanced the carrier efficiency. Benefiting from the high carrier efficiency, both ethylene permeability and ethylene/ethane selectivity were significantly elevated, which could reach up to 100 Barrers and 40, respectively, surpassing most of results reported in the open literature. Meanwhile, the ethylene and ethane solubility data in the carrier/ILs were measured in a pressure range from 0 to 3.5 bar at 298.15 K, a first-order equilibrium model based on the formation carrier-ethylene complex species has been developed to describe the physical and chemical dissolving behaviors of ethylene and the equilibrium constants were obtained accordingly. Moreover, the membrane separation process was optimized, confirming that ethylene permeability and ethylene/ethane selectivity increased with the increase of carrier concentration due to the combined effects of gas solubility and diffusion. It was notable that the selectivity of as-prepared SILMs was more effective at lower transmembrane pressures and operating temperatures, which contributed to designing the energy-efficient and sustainable membrane processes. This study opens a new route for the utilization of the IL properties to manipulate the carrier efficiency for developing high performance SILMs.

中文翻译：

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通过强氢键碱性具有高载体效率的负载型离子液体膜，用于可持续有效的烯烃/石蜡分离

摘要 负载型离子液体膜 (SILM) 是烯烃/石蜡分离膜的重大进步。不幸的是，低载流子效率极大地阻碍了 SILM 的应用。在此，设计了通过强氢键碱性具有高载流子效率的 SILM 来进行有效的乙烯/乙烷分离。ILs 的强氢键碱性不仅赋予膜高载流子浓度，而且有效地有利于载体的良好解离，通过 IL 和载体之间的配位相互作用形成溶剂化的自由离子，大大增加了载流子的数量，增强了载体效率。得益于高载体效率，乙烯渗透率和乙烯/乙烷选择性均显着提高，分别可以达到 100 Barrers 和 40 Barrers，超过了公开文献中报道的大多数结果。同时，在 298.15 K 和 0 到 3.5 bar 的压力范围内测量了载体/ILs 中乙烯和乙烷的溶解度数据，开发了基于形成载体-乙烯复合物物种的一级平衡模型来描述物理并据此得到乙烯的化学溶解行为和平衡常数。此外，对膜分离过程进行了优化，证实了由于气体溶解度和扩散的共同作用，乙烯渗透率和乙烯/乙烷选择性随着载流子浓度的增加而增加。值得注意的是，所制备的 SILM 的选择性在较低的跨膜压力和操作温度下更有效，这有助于设计节能和可持续的膜工艺。这项研究为利用 IL 特性来操纵载流子效率以开发高性能 SILM 开辟了一条新途径。