Fernández-Barquín Ana, Rea Riccardo, Venturi Davide, Giacinti-Baschetti Marco, De Angelis Maria Grazia, Casado-Coterillo Clara, Irabien Ángel
Department of Chemical and Biomolecular Engineering, ETSIIT. Universidad de Cantabria Avda Los Castros S/N 39005 Santander Spain
Dipartimento di Ingegneria Civile Chimica Ambientale e dei Materiali, Alma Mater Studiorum-Universita di Bologna Via Terracini 28 Bologna Italy.
RSC Adv. 2018 Jan 17;8(7):3536-3546. doi: 10.1039/c7ra13039b. eCollection 2018 Jan 16.
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 CO from wet industrial streams. In this work, the water vapor effect on the N, CH and CO 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 CO/N and CO/CH selectivities, in zeolite A/PTMSP MMMs, the CO permeability increases with increasing water content in the system up to 50% R.H., resulting in an increase in CO/N and CO/CH 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.
增加对新型混合基质膜（MMMs）中水蒸气影响的认识，可能有助于将新型膜材料应用于从潮湿工业气流中回收CO。在这项工作中，研究了在0-75%相对湿度范围内，水蒸气对由20 wt%亲水性沸石4A与疏水性PTMSP聚合物组成的MMMs的N₂、CH₄和CO渗透性的影响。在纯PTMSP膜中，所有气体的渗透率都随水蒸气活度降低，CO/N₂和CO/CH₄选择性几乎不变；而在沸石A/PTMSP MMMs中，系统中含水量增加至50%相对湿度时，CO渗透率增加，相对于纯PTMSP，CO/N₂和CO/CH₄选择性增加。研究了气体吸附，以便了解沸石4A中的残余湿度对不同气体吸附的影响，这有助于解释渗透率观测结果。基于NELF理论，通过一个简单的模型方程评估了吸附和湿渗透行为，该方程非常精确地考虑了湿度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的抵消作用。
