Steam recovery via nanoporous and subnanoporous organosilica membranes: The effects of pore structure and operating conditions
Steam recovery via nanoporous and subnanoporous organosilica membranes: The effects of pore structure and operating conditions
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DOI：
10.1016/j.seppur.2021.119191
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发表时间：
2021-11
影响因子：
8.6
通讯作者：
Norihiro Moriyama;Hiroki Nagasawa;M. Kanezashi;T. Tsuru
中科院分区：
文献类型：
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作者：
Norihiro Moriyama;Hiroki Nagasawa;M. Kanezashi;T. Tsuru
在本研究中，制备了纳米多孔（孔径为1.5 nm）和亚纳米多孔（孔径为0.42-0.43 nm）有机二氧化硅膜，通过蒸汽渗透（VP）在高温下实现蒸汽回收。这些膜在不同的操作条件下进行了评估，包括高温（80-150°C），进料流中不同的水摩尔分数（0.1-0.9），进料压力（130-140 kPa （abs.）或400 kPa (abs.)）和渗透（~0 kPa （abs.）或100 kPa (abs.)）。通过对纳米孔膜和亚纳米孔膜性能的比较，可以清楚地看出亚纳米孔结构在高温下蒸汽回收方面的优势。在150°C时，亚纳米孔有机硅膜的水透率为10−6mol/(m2s Pa)，水/ n2透率为数百，而纳米孔有机硅膜的水透率约为10−5mol/(m2s Pa)，水/ n2透率低于10。此外，在VP过程中，亚纳米孔有机硅膜在300 kPa跨膜压力下的最大水通量高达73 kg/(m2h)。此外，亚纳米孔有机硅膜对七种二元蒸汽/不凝气体（He, H2, CO2, N2, CH4, CF4, SF6）混合物表现出相似的高透水性。
In this study, nanoporous (pore size: 1.5 nm) and subnanoporous (pore size: 0.42–0.43 nm) organosilica membranes were prepared to accomplish steam recovery via vapor permeation (VP) at high temperatures. These membranes were evaluated under various operating conditions that included high temperatures (80–150 °C), various water mole fractions in the feed stream (0.1–0.9), and various pressures of the feed (130–140 kPa (abs.) or 400 kPa (abs.)) and permeate (~0 kPa (abs.) or 100 kPa (abs.)). A comparison of the performances of nanoporous and subnanoporous membranes clearly showed the advantage of the subnanoporous structure for steam recovery under high temperature. Subnanoporous organosilica membranes showed water permeance of several 10−6mol/(m2s Pa) and an H2O/N2permeance ratio of several hundreds at 150 °C, compared with the results from nanoporous organosilica membranes that were approximately 10−5mol/(m2s Pa) and below ten, respectively. Furthermore, subnanoporous organosilica membranes showed a maximum water flux as high as 73 kg/(m2h) at a transmembrane pressure of 300 kPa during VP. In addition, subnanoporous organosilica membranes showed similar high levels of water permeance for seven binary steam/non-condensable gas (He, H2, CO2, N2, CH4, CF4, SF6) mixtures.