Abstract To examine the prospect of a future application of organosilica membranes to steam recovery under hydrothermal conditions, we proposed a novel concept that involved a hydrothermally stable intermediate layer derived from colloidal 1,2-bis(triethoxysilyl)ethane (BTESE) sols with a BTESE-derived separation top layer. In this work, a BTESE-derived nanoporous intermediate layer (i-BTESE) was prepared from a BTESE-derived colloidal sol without pinholes or cracks, and then a BTESE-derived sub-nanoporous separation layer was formed on the i-BTESE to obtain a BTESE/i-BTESE membrane. The BTESE/i-BTESE membrane showed excellent water permeance as high as 5 × 10-6 mol/(m2 s Pa), and a high level of permeance was maintained for as long as 361 h at 200°C under vapor pressure of 200 kPa (abs.). In addition, the membrane achieved an H2O/N2 permeance ratio that reached as high as 350 even after 361 h. On the other hand, the permeance of a conventional BTESE-derived membrane that used a silica-zirconia intermediate layer (BTESE/i-SiO2-ZrO2) decreased gradually, which suggested a degradation of the BTESE/i-SiO2-ZrO2 membrane. The high and stable performance of the BTESE/i-BTESE membrane confirmed the proposed concept whereby a hydrothermally stable intermediate layer could significantly improve the hydrothermal stability that is required in order to use organosilica membranes in steam recovery.

中文翻译：

---

通过使用水热稳定的中间层提高有机硅膜在中高温下蒸汽回收的性能

摘要 为了研究有机硅膜在水热条件下蒸汽回收的未来应用前景，我们提出了一个新概念，该概念涉及源自胶体 1,2-双（三乙氧基甲硅烷基）乙烷（BTESE）溶胶和 BTESE 的水热稳定中间层。 -衍生的分离顶层。在这项工作中，BTESE 衍生的纳米多孔中间层 (i-BTESE) 是由 BTESE 衍生的胶体溶胶制备的，没有针孔或裂缝，然后在 i-BTESE 上形成 BTESE 衍生的亚纳米多孔分离层以获得BTESE/i-BTESE 膜。BTESE/i-BTESE 膜显示出高达 5 × 10-6 mol/(m2 s Pa) 的优异水渗透性，并且在 200°C 和 200 蒸汽压下保持高渗透性长达 361 小时。千帕（绝对）。此外，该膜实现了 H2O/N2 渗透比，即使在 361 小时后也能达到 350。另一方面，使用二氧化硅-氧化锆中间层（BTESE/i-SiO2-ZrO2）的传统 BTESE 衍生膜的渗透性逐渐降低，这表明 BTESE/i-SiO2-ZrO2 膜的降解。BTESE/i-BTESE 膜的高性能和稳定证实了所提出的概念，即水热稳定的中间层可以显着提高在蒸汽回收中使用有机二氧化硅膜所需的水热稳定性。这表明 BTESE/i-SiO2-ZrO2 膜的降解。BTESE/i-BTESE 膜的高性能和稳定证实了所提出的概念，即水热稳定的中间层可以显着提高在蒸汽回收中使用有机二氧化硅膜所需的水热稳定性。这表明 BTESE/i-SiO2-ZrO2 膜的降解。BTESE/i-BTESE 膜的高性能和稳定证实了所提出的概念，即水热稳定的中间层可以显着提高在蒸汽回收中使用有机二氧化硅膜所需的水热稳定性。