Ionic Liquid Stabilizes Olefin Facilitated Transport Membranes Against Reduction
Ionic Liquid Stabilizes Olefin Facilitated Transport Membranes Against Reduction
复制标题
离子液体稳定烯烃促进传输膜以防止还原
DOI：
10.1002/ange.202202895
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发表时间：
2022
影响因子：
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通讯作者：
Brennecke, Joan F.
中科院分区：
文献类型：
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作者：
Park, Sejoon;Morales‐Collazo, Oscar;Freeman, Benny;Brennecke, Joan F.
烯烃与其链烷烃类似物的分离依赖于能量密集型低温蒸馏。可逆地和选择性地结合烯烃而不是石蜡的促进传输基膜可以节省大量的能量。然而，这种膜中的银离子烯烃结合载体的化学不稳定性一直是这种方法的长期障碍。我们发现了长期的载体稳定性，可以长期暴露于氢气，这是此类流中的常见污染物。基于UV/维斯吸收和拉曼光谱，沿着XRD分析结果，某些离子液体增溶银离子，并且围绕银离子载体的阴离子聚集体极大地减弱了它们被氢还原。在这里，我们报告了在连续暴露于高压氢气下的烯烃/烷烃分离性能的稳定性，这解决了基于膜的烯烃/烷烃分离中的关键技术障碍。
Separation of olefins from their paraffin analogs relies on energy‐intensive cryogenic distillation. Facilitated transport‐based membranes that reversibly and selectively bind olefins, but not paraffins, could save considerable amounts of energy. However, the chemical instability of the silver ion olefin‐binding carriers in such membranes has been a longstanding roadblock for this approach. We discovered long‐term carrier stability against extended exposure to hydrogen, a common contaminant in such streams. Based on UV/Vis absorption and Raman spectroscopy, along with XRD analysis results, certain ionic liquids solubilize silver ions, and anion aggregates surrounding the silver ion carriers greatly attenuate their reduction by hydrogen. Here, we report the stability of olefin/paraffin separation properties under continuous exposure to high pressure hydrogen, which addresses a critical technical roadblock in membrane‐based olefin/paraffin separation.