Wotzka Alexander, Jorabchi Majid Namayandeh, Wohlrab Sebastian
Leibniz Institute for Catalysis at the University of Rostock, Albert-Einstein-Str. 29a, D-18059 Rostock, Germany.
Membranes (Basel). 2021 Jun 10;11(6):439. doi: 10.3390/membranes11060439.
The separation of CO from gas streams is a central process to close the carbon cycle. Established amine scrubbing methods often require hot water vapour to desorb the previously stored CO. In this work, the applicability of MFI membranes for HO/CO separation is principally demonstrated by means of realistic adsorption isotherms computed by configurational-biased Monte Carlo (CBMC) simulations, then parameters such as temperatures, pressures and compositions were identified at which inorganic membranes with high selectivity can separate hot water vapour and thus make it available for recycling. Capillary condensation/adsorption by water in the microporous membranes used drastically reduces the transport and thus the CO permeance. Thus, separation factors of α = 6970 could be achieved at 70 °C and 1.8 bar feed pressure. Furthermore, the membranes were tested for stability against typical amines used in gas scrubbing processes. The preferred MFI membrane showed particularly high stability under application conditions.
从气流中分离出一氧化碳是实现碳循环闭合的核心过程。现有的胺洗涤方法通常需要热水蒸汽来解吸先前储存的一氧化碳。在这项工作中，首先通过构型偏倚蒙特卡罗（CBMC）模拟计算出的实际吸附等温线，证明了MFI膜用于水/一氧化碳分离的适用性，然后确定了温度、压力和组成等参数，在这些参数下具有高选择性的无机膜可以分离热水蒸汽，从而使其能够循环利用。微孔膜中水分的毛细管冷凝/吸附极大地降低了传输速率，进而降低了一氧化碳的渗透通量。因此，在70℃和1.8巴进料压力下，分离因子α可达6970。此外，还测试了这些膜对气体洗涤过程中使用的典型胺的稳定性。优选的MFI膜在应用条件下表现出特别高的稳定性。
