Pebax/POSS mixed matrix membranes for ethanol recovery from aqueous solutions via pervaporation
Pebax/POSS mixed matrix membranes for ethanol recovery from aqueous solutions via pervaporation
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DOI：
10.1016/j.memsci.2011.05.060
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发表时间：
2011-09
期刊：
影响因子：
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通讯作者：
N. Le;Yan Wang;T. Chung
中科院分区：
文献类型：
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作者：
N. Le;Yan Wang;T. Chung
本研究开发了新型聚醚嵌段酰胺/多面体低聚倍半硅氧烷（Pebax/POSS）混合基质膜，并研究了其渗透汽化分离乙醇的性能。两种POSS;即八（3-羟基-3-甲基丁基二甲基甲硅烷氧基）（AL 0136）和二硅烷醇异丁基（SO 1440），被引入到Pebax膜中。研究了POSS负载量、料液乙醇浓度和料液温度对新型混合基质膜渗透汽化性能的影响。POSS纳米粒子的引入显著提高了杂化膜的渗透汽化性能。在2 wt.% PESS负载量、乙醇/水的渗透通量和分离因子均达到最大值，Pebax/AL 0136和Pebax/SO 1440分别为183.5g/m2·h和4.6和125.8g/m2·h和4.1。Pebax/AL 0136 MMM的性能优于Pebax/SO 1440 MMM，可能是由于其对乙醇的亲和力更高。实验结果表明，料液乙醇浓度增加，膜通量增加，但分离因子和膜选择性降低。随着操作温度的升高，由于驱动力的增加和渗透物吸附的减少，通量增加，但渗透率降低。还观察到分离因子和选择性随着操作温度的增加而增加。驱动力的变化，簇的形成，膜溶胀和渗透分子之间的相互作用起着至关重要的作用，观察到的趋势。这项工作可能会提供有用的见解混合基质膜，特别是那些含有POSS渗透蒸发回收应用。
Novel mixed matrix membranes made of polyether-block-amide/polyhedral oligosilsesquioxane (Pebax/POSS) have been developed and investigated in this study for ethanol recovery via pervaporation separation. Two types of POSS; namely, octa(3-hydroxy-3-methylbutyldimethylsiloxy) (AL0136) and disilanolisobutyl (SO1440), were incorporated into Pebax membranes. The effects of POSS loading, feed ethanol concentration and feed temperature on pervaporation performance of the newly developed mixed matrix membranes (MMMs) have been studied. The incorporation of POSS nanoparticles improve the pervaporation performance of the hybrid membranes significantly. At 2wt.% POSS loading, both permeation flux and separation factor of ethanol/water reach maximum values, which are 183.5g/m2h and 4.6 for Pebax/AL0136 and 125.8g/m2h and 4.1 for Pebax/SO1440, respectively. Pebax/AL0136 MMMs give better performance than Pebax/SO1440 MMMs, probably due to its higher affinity towards ethanol. Experimental results show that an increase in feed ethanol concentration results in an increase in flux, but decreases in separation factor and membrane selectivity. Flux increases but permeability decreases with an increase in operating temperature due to the increase in driving forces and the reduction in permeant sorption, respectively. Separation factor and selectivity are also observed to increase with increasing operating temperature. The changes in driving force, cluster formation, membrane swelling and interaction among permeating molecules play essential roles for the observed trends. This work may provide useful insights of mixed matrix membranes, especially those containing POSS for pervaporation recovery applications.