Membrane Design Criteria and Practical Viability of Pressure-Driven Distillation
Membrane Design Criteria and Practical Viability of Pressure-Driven Distillation
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DOI：
10.1021/acs.est.2c07765
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发表时间：
2023-01-24
影响因子：
11.4
通讯作者：
Lin，Shihong
中科院分区：
文献类型：
--
作者：
Liu，Weifan;Wang，Ruoyu;Lin，Shihong
压力驱动蒸馏（PD）是一种新型的海水淡化技术，它是基于水压力驱动和水蒸气在疏水多孔膜上的传输。从理论上讲，PD提供了近乎完美的拒绝非挥发性溶质，耐氯性，并能够解耦水和溶质传输。尽管其优点，孔润湿和反向跨膜温差的发展是PD中潜在的关键问题，前者损害了盐截留率，而后者减少甚至消除了蒸汽传输的驱动力。我们在此提出了一个分析，以评估的实际可行性和膜设计原则的PD的通量和盐截留率（SR）对膜性能的依赖关系的重点。通过模拟不同条件下的PD过程中的传质，我们得到了两个重要的结论。首先，实际上有害的反向跨膜温差在所有相关情况下都不会在PD中发展，因此不是实际问题。第二，对于实现可接受的SR的PD过程，膜孔应该是具有高度均匀的孔径分布的纳米级。该分析证明了PD的实际可行性，并提供了设计耐用和高性能PD膜的原则。
Pressure-driven distillation (PD) is a novel desalination technology based on hydraulic pressure driving force and vapor transport across a hydrophobic porous membrane. In theory, PD offers near-perfect rejection for nonvolatile solutes, chlorine resistance, and the ability to decouple water and solute transport. Despite its advantages, pore wetting and the development of a reverse transmembrane temperature difference are potential critical concerns in PD, with the former compromising the salt rejection and the latter reducing or even eliminating the driving force for vapor transport. We herein present an analysis to evaluate the practical viability and membrane design principles of PD with a focus on the dependence of flux and salt rejection (SR) on membrane properties. By modeling the mass transfer in a PD process under different conditions, we arrive at two important conclusions. First, a practically detrimental reverse transmembrane temperature difference does not develop in PD under all relevant circumstances and is thus not a practical concern. Second, for a PD process to achieve an acceptable SR, the membrane pores should be at the nanometer scale with a highly uniform pore size distribution. This analysis demonstrates the practical viability of PD and provides the principles for designing robust and high-performance PD membranes.