Will ultra-high permeance membranes lead to ultra-efficient processes? Challenges for molecular separations in liquid systems
Will ultra-high permeance membranes lead to ultra-efficient processes? Challenges for molecular separations in liquid systems
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DOI：
10.1016/j.memsci.2016.10.014
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发表时间：
2017-03-01
影响因子：
9.5
通讯作者：
Livingston, Andrew G.
中科院分区：
文献类型：
--
作者：
Shi, Binchu;Marchetti, Patrizia;Livingston, Andrew G.
科学文献中越来越多的报告描述了具有超高渗透率的膜，这种膜可能通过使分离过程显著提高而彻底改变液体系统中的分子分离。其中许多报告涉及材料科学的突破，包括制造新的二维材料，如氧化石墨烯，以及结构材料，如金属有机骨架。有趣的是，所描述的超高渗透率总是在高度稀释系统中对平板薄膜进行测量。通常不考虑跨膜的压力梯度的影响，以及在重要的真实世界浓度下的浓度极化的影响。在实践中，工业过程中使用的是膜组件，而不是平板膜片。在集中式系统中，采用组件、浓度极化和组件压降也会影响整体工艺性能。这项工作考察了考虑螺旋缠绕和中空纤维配置的情况下，增加膜透过率对使用膜组件的过程的影响程度。我们的主要结论是，超高渗透膜不会对目前的模块设计产生重大影响；我们的建议是，需要对模块和工艺设计进行新的研究。
An increasing number of reports in the scientific literature describe membranes with ultra-high permeance which might revolutionise molecular separations in liquid systems by making separation processes dramatically more efficient. Many of these reports relate to breakthroughs in materials science, including fabrication of new 2-D materials such as graphene oxide, and structured materials such as metal organic frameworks. Interestingly, the ultra-high permeances described are invariably measured for flat sheet membranes, in highly dilute systems. The effects of pressure gradients across the membrane, and the effects of concentration polarisation at significant, real world concentrations are not usually considered. In practise, membrane modules, rather than flat membrane sheets, are used in industrial processes. In concentrated systems, employing modules, concentration polarisation and module pressure drops will also affect overall process performance. This work examines the extent to which increasing membrane permeance can impact on processes employing membrane modules, considering both spiral-wound and hollow fibre configurations. Our key conclusion is that ultra-high permeance membranes will not be able to make a significant impact on process efficiency with current module designs; and our recommendation is that fresh research into module and process design is required.