Characterization and performance evaluation of commercially available hydrophobic membranes for direct contact membrane distillation
Characterization and performance evaluation of commercially available hydrophobic membranes for direct contact membrane distillation
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DOI：
10.1016/j.desal.2016.04.006
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发表时间：
2016-08-15
期刊：
影响因子：
9.9
通讯作者：
Van der Bruggen, B.
中科院分区：
文献类型：
--
作者：
Eykens, L.;De Sitter, K.;Van der Bruggen, B.
膜蒸馏（MD）使用微孔疏水膜从液体流中分离非挥发性溶质。微孔结构应被设计用于通过膜的最佳蒸汽传输，而疏水性是保持液相所必需的。目前，不同类型的市售疏水微滤膜用于膜蒸馏。然而，这些膜之间没有比较，使得选择合适的膜和评估新膜变得复杂。在这项研究中，超过20（半）商业疏水膜的特点和测试在实验室规模的直接接触膜蒸馏装置。这些膜包括标准的PTFE、PVDF和PP膜，但也包括不太知名的PE和PES膜。这些膜使用相转化技术、拉伸或静电纺丝来合成，从而产生各种各样的膜结构。在这项研究中，提出了一种方法来评价膜的适用性。膜性能在MD评价与性能图表，包括通量和能源效率，使用现实的工艺条件。根据该图表，提出了基准性能，其取决于盐浓度。(C)2016爱思唯尔B.V.保留所有权利。
Membrane distillation (MD) uses a microporous hydrophobic membrane for the separation of non-volatile solutes from liquid streams. The microporous structure should be designed for optimal vapor transport through the membrane, whereas the hydrophobicity is required to retain the liquid phase. Currently, different types of commercially available hydrophobic microfiltration membranes are used for membrane distillation. However, no comparison is available between these membranes, complicating the selection of a proper membrane and the evaluation of new membranes. In this study, over 20 (semi-)commercial hydrophobic membranes are characterized and tested in a lab scale direct contact membrane distillation set-up. These membranes include the standard PTFE, PVDF and PP membranes, but also less known PE and PES membranes. These membranes are synthesized using the phase inversion technique, stretching or electrospinning, resulting in a wide variety of membrane structures. In this study, a method is proposed to evaluate the suitability of membranes. The membrane performance in MD is evaluated with a performance chart including flux and energy efficiency using realistic process conditions. From this chart a benchmark performance is proposed, which depends on the salt concentration. (C) 2016 Elsevier B.V. All rights reserved.