Abstract Stable UiO-66 membranes were successfully prepared on macroporous alumina tubes by secondary growth and were for the first time applied in the separation of methanol/methyl tert-butyl ether (MTBE) mixtures by pervaporation. Two key factors affecting the growth of the UiO-66 membranes were investigated. It has been found that acetic acid promotes the crystallization of UiO-66 crystals and water favors the intergrowth of UiO-66 crystals, leading to the formation of high-performance UiO-66 membranes. Under the optimized synthesis conditions, a continuous and dense UiO-66 membrane could be obtained, showing a separation factor of nearly 600 and a flux of 1.21 kg m −2 h −1 for 5 wt% methanol/MTBE mixtures at 40 °C. The effects of operation parameters on PV performance of the UiO-66 membranes were also studied in detail. The results reveal that increasing feed temperature or methanol in feed would enhance permeation flux but reduce separation factor, the permeability of components and membrane selectivity. It is worth mentioning that the UiO-66 membranes show excellent operating stability. This work demonstrates that the UiO-66 membranes have great potential for separation of methanol/MTBE mixtures via pervaporation.

中文翻译：

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通过二次生长合成稳定的 UiO-66 膜，用于甲醇/甲基叔丁基醚混合物的渗透蒸发分离

摘要 通过二次生长在大孔氧化铝管上成功制备了稳定的UiO-66膜，并首次应用于甲醇/甲基叔丁基醚(MTBE)混合物的渗透蒸发分离。研究了影响 UiO-66 膜生长的两个关键因素。已经发现，乙酸促进了 UiO-66 晶体的结晶，水有利于 UiO-66 晶体的共生，从而形成了高性能的 UiO-66 膜。在优化的合成条件下，可以获得连续致密的 UiO-66 膜，在 40°C 下，5 wt% 甲醇/MTBE 混合物的分离系数接近 600，通量为 1.21 kg m -2 h -1。还详细研究了操作参数对 UiO-66 膜 PV 性能的影响。结果表明，提高进料温度或进料中的甲醇会提高渗透通量，但会降低分离因子、组分渗透率和膜选择性。值得一提的是，UiO-66 膜显示出优异的操作稳定性。这项工作表明，UiO-66 膜具有通过渗透蒸发分离甲醇/MTBE 混合物的巨大潜力。