Abstract The ability to tailor ionic liquids can result in very high separation efficiency for CO 2 /CH 4 and CO 2 /N 2 . In this study, a new protic ionic liquid was synthesized with high CO 2 absorption capacity employing (3-aminopropyl) trimethoxysilane and acetic acid, both of these have been reported to exhibit high affinity for CO 2 . The synthesized ionic liquid was characterized by FTIR and the supported ionic liquid membrane was tested to determine the separation of CO 2 from CH 4 . Experiments were conducted at different temperatures and feed conditions, and pure and mixed gas permeability/selectivity data were reported. This combination of silyl ether functionalized cation and acetate ion dramatically improved the membrane separation performance as the SILM displayed CO 2 permeance of 23 GPU combined with CO 2 /CH 4 selectivity of 41. The synthesized SILM was stable upto 10 bar as no leaching of ionic liquid was observed and the permeance increased from 23 to 31 GPU as the temperature was raised from 25 °C to 65 °C, while the selectivity slightly decreased from 41 to 35 over the same temperature range. The exceptionally high selectivity of CO 2 /CH 4 makes [APTMS][Ac] a promising room temperature ionic liquid for CO 2 separation without facilitated transport. A synergistic effect of methoxy groups from [APTMS] part of the ionic liquid caused the enhanced permeability of CO 2 as supported by theoretical calculations.

中文翻译：

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基于 3-(三甲氧基甲硅烷基)丙-1-乙酸胺的负载型质子离子液体膜用于高选择性分离 CO 2

摘要 定制离子液体的能力可以使 CO 2 /CH 4 和 CO 2 /N 2 的分离效率非常高。在这项研究中，使用（3-氨基丙基）三甲氧基硅烷和乙酸合成了一种具有高 CO 2 吸收能力的新型质子离子液体，据报道，这两种物质都对 CO 2 具有高亲和力。合成的离子液体通过FTIR表征并且测试负载的离子液体膜以确定CO 2 与CH 4 的分离。在不同温度和进料条件下进行实验，并报告纯气体和混合气体渗透率/选择性数据。这种甲硅烷基醚官能化阳离子和乙酸根离子的组合显着提高了膜分离性能，因为 SILM 显示出 23 GPU 的 CO 2 渗透率和 41 的 CO 2 /CH 4 选择性。合成的 SILM 在高达 10 bar 的压力下保持稳定，因为没有观察到离子液体的浸出，并且随着温度从 25 °C 升高到 65 °C，渗透率从 23 增加到 31 GPU，而选择性从 41 到 35 略有下降。相同的温度范围。CO 2 /CH 4 的超高选择性使 [APTMS][Ac] 成为一种有前途的室温离子液体，用于分离 CO 2 而无需促进传输。如理论计算所支持的，来自离子液体的[APTMS]部分的甲氧基的协同作用导致CO 2 的渗透性增强。而在相同的温度范围内，选择性从 41 略微下降到 35。CO 2 /CH 4 的超高选择性使 [APTMS][Ac] 成为一种有前途的室温离子液体，用于分离 CO 2 而无需促进传输。如理论计算所支持的，来自离子液体的[APTMS]部分的甲氧基的协同作用导致CO 2 的渗透性增强。而在相同的温度范围内，选择性从 41 略微下降到 35。CO 2 /CH 4 的超高选择性使 [APTMS][Ac] 成为一种有前途的室温离子液体，用于分离 CO 2 而无需促进传输。如理论计算所支持的，来自离子液体的[APTMS]部分的甲氧基的协同作用导致CO 2 的渗透性增强。