Increasing the knowledge of the influence of water vapor in new mixed matrix membranes (MMMs) could favor the integration of novel membrane materials in the recovery of CO₂ from wet industrial streams. In this work, the water vapor effect on the N₂, CH₄ and CO₂ permeability through MMMs comprised of 20 wt% hydrophilic zeolite 4A in hydrophobic PTMSP polymer were investigated in the relative humidity range 0–75%. While in the pure PTMSP membranes, the permeability of all gases decreases with water vapor activity, with almost unchanged CO₂/N₂ and CO₂/CH₄ selectivities, in zeolite A/PTMSP MMMs, the CO₂ permeability increases with increasing water content in the system up to 50% R.H., resulting in an increase in CO₂/N₂ and CO₂/CH₄ selectivities with respect to pure PTMSP. Gas sorption was studied so that the effect the residual humidity in the zeolite 4A has on the sorption of the different gases helped explaining the permeability observations. The sorption and humid permeation behavior were evaluated by a simple model equation based on the NELF theory, taking into account the multicomponent gas sorption and diffusion in the presence of humidity, as well as the counteracting effects of the hydrophobic PTMSP and hydrophilic zeolite A in a very accurate way.

中文翻译：

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相对湿度对沸石 A/PTMSP 混合基质膜气体传输性能的影响†

增加对水蒸气对新型混合基质膜 (MMM) 影响的了解有助于将新型膜材料整合到从湿工业流中回收 CO _2中。在这项工作中，水蒸气对 N ₂、CH ₄和 CO ₂渗透性的影响通过由 20 wt% 亲水性沸石 4A 在疏水性 PTMSP 聚合物中组成的 MMM 在相对湿度范围 0-75% 下进行了研究。而在纯 PTMSP 膜中，所有气体的渗透性随着水蒸气活性而降低，而 CO ₂ /N ₂和 CO ₂ /CH ₄选择性几乎没有变化，而在沸石 A/PTMSP MMM 中，CO ₂渗透性随着系统中含水量的增加而增加，最高可达 50% RH，导致相对于纯 PTMSP的 CO ₂ /N ₂和 CO ₂ /CH _{4选择性增加。}研究了气体吸附，因此沸石 4A 中的残余湿度对不同气体吸附的影响有助于解释渗透率观察结果。吸附和湿气渗透行为通过基于 NELF 理论的简单模型方程评估，考虑到湿气存在下的多组分气体吸附和扩散，以及疏水性 PTMSP 和亲水性沸石 A 在 a非常准确的方法。