Chemical Engineering Department, Delft University of Technology, Van der Maasweg 9, 2629, HZ, Delft, The Netherlands.
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, 5 Xinmofan Road, Nanjing, 210009, P. R. China.
Angew Chem Int Ed Engl. 2019 Oct 21;58(43):15518-15525. doi: 10.1002/anie.201909544. Epub 2019 Sep 13.
Xe is only produced by cryogenic distillation of air, and its availability is limited by the extremely low abundance. Therefore, Xe recovery after usage is the only way to guarantee sufficient supply and broad application. Herein we demonstrate DD3R zeolite as a benchmark membrane material for CO /Xe separation. The CO permeance after an optimized membrane synthesis is one order magnitude higher than for conventional membranes and is less susceptible to water vapour. The overall membrane performance is dominated by diffusivity selectivity of CO over Xe in DD3R zeolite membranes, whereby rigidity of the zeolite structure plays a key role. For relevant anaesthetic composition (<5 % CO ) and condition (humid), CO permeance and CO /Xe selectivity stabilized at 2.0×10 mol m s Pa and 67, respectively, during long-term operation (>320 h). This endows DD3R zeolite membranes great potential for on-stream CO removal from the Xe-based closed-circuit anesthesia system. The large cost reduction of up to 4 orders of magnitude by membrane Xe-recycling (>99+%) allows the use of the precious Xe as anaesthetics gas a viable general option in surgery.
氙气仅可通过空气的低温蒸馏制取，且由于其含量极低，因此其供应量有限。因此，使用后对氙气进行回收是保证充足供应和广泛应用的唯一途径。在此，我们展示了 DD3R 沸石作为 CO /Xe 分离的基准膜材料。经过优化的膜合成后，CO 的渗透系数比传统膜高一个数量级，且对水蒸气的敏感度更低。DD3R 沸石膜中 CO 在 Xe 上的扩散选择性决定了整体膜性能，其中沸石结构的刚性起着关键作用。对于相关的麻醉成分（<5% CO ）和条件（潮湿），CO 的渗透系数和 CO /Xe 的选择性在长时间运行（>320 h）期间稳定在 2.0×10 mol m s Pa 和 67 左右。这使得 DD3R 沸石膜在从基于氙的闭路麻醉系统中在线去除 CO 方面具有巨大的潜力。通过膜回收氙气（>99+%）可将成本降低多达 4 个数量级，从而使作为麻醉气体的珍贵氙气成为手术中可行的一般选择。
