In this work, a simple and cost-effective method of using epichlorohydrin (ECH) was developed to prepare ECH-amine-based crosslinked protic ionic liquids (CPILs) that were further used as membrane materials for selective separation of CO₂. FT-IR, NMR, ESI-MS and HRMS were applied to confirm the crosslinking mechanism of 3-(dimethylamino)-1-propylamine methoxyacetate ([DMAPAH][MOAc]) reacting with ECH, as well as the possible chemical structures of ECH-amine-based CPILs. Aqueous sols and gels of CPILs were introduced into porous PES membrane supports, and the as-prepared membranes were tested for their CO₂ separation performance under humidified condition. It was found that the ideal selectivities of CO₂/N₂ and CO₂/CH₄ in these membranes were up to 318.4 and 138.4, respectively, while the CO₂ permeability was 517.7 barrers (0.1 bar, 40 °C). Analysis showed that the high separation selectivity benefited primarily from the enhanced salting-out effect in these CPILs. The influences of ECH-to-[DMAPAH][MOAc] molar ratio, CO₂ transmembrane pressure, water content as well as operating temperature on the separation performance were also systemically investigated. In particular, tuning the molar ratio of carboxylic acid to amine (MOAc-to-DMAPA molar ratio) was proposed and applied to optimize CO₂ separation performance. This work offers a feasibile fabrication of ECH-amine-based CPIL membranes with both good mechanical property and CO₂ separation performance.

在这项工作中，开发了一种使用环氧氯丙烷（ECH）的简单且经济高效的方法来制备基于ECH-胺的交联质子离子液体（CPIL），该液体进一步用作选择性分离CO _2的膜材料。FT-IR，NMR，ESI-MS和HRMS用于证实3-（二甲氨基）-1-丙胺甲氧基乙酸酯（[DMAPAH] [MOAc]）与ECH反应的交联机理以及ECH可能的化学结构-基于胺的CPIL。将CPIL的溶胶和凝胶引入多孔PES膜载体中，并测试制备的膜在湿润条件下的CO ₂分离性能。发现CO ₂ / N ₂和CO ₂的理想选择性这些膜中的/ CH ₄分别高达318.4和138.4，而CO ₂渗透性为517.7 barrers（0.1 bar，40°C）。分析表明，高分离选择性主要得益于这些CPIL中增强的盐析作用。还系统地研究了ECH与[DMAPAH] [MOAc]的摩尔比，CO ₂跨膜压力，水含量以及操作温度对分离性能的影响。特别地，提出了调节羧酸与胺的摩尔比（MOAc与DMAPA的摩尔比）并将其应用于优化CO ₂分离性能。这项工作提供了一种具有良好机械性能和CO _2的ECH-胺基CPIL膜的可行制造方法。 分离性能。