Oh Seungtae, Ki Seokkan, Ryu Seunggeol, Shin Myung Chul, Lee Jinki, Lee Choongyeop, Nam Youngsuk
Department of Mechanical Engineering , Kyung Hee University , Yongin 17104 , Korea.
Thermochemical Energy System R&D Group , Korea Institute of Industrial Technology , Cheonan 31056 , Korea.
Langmuir. 2019 Jun 18;35(24):7769-7782. doi: 10.1021/acs.langmuir.9b00993. Epub 2019 May 30.
A membrane with selective wettability to either oil or water has been utilized for highly efficient, environmentally friendly membrane-based oil-water separation. However, a predictive model, which can be used to evaluate the overall separation performance of the membrane, still needs further development. Herein, we investigate three separation performance parameters, that is, separation efficiency, liquid intrusion pressure, and mass flux in particular, as a function of pore geometry and liquid properties using metallic meshes whose surface wettability is modified by scalable spray coating. We show that the prepared membrane exhibits a separation efficiency over 98% below the intrusion pressure, while the intrusion pressure increases with the decrease of pore size of the membrane. Particularly, we develop a semi-empirical model for the mass flux through the membrane. As application examples of our performance analysis, we successfully predict the separation time for one-way and two-way gravity-driven separation of the oil-water mixture, the decrease of the mass flux due to membrane fouling, and the maximum allowable separation capacity of the given membrane. This work can help to design optimal membrane-based oil-water separation systems for actual industrial applications by providing a selection guideline for separation membranes.
一种对油或水具有选择性润湿性的膜已被用于高效、环保的基于膜的油水分离。然而，一个可用于评估膜整体分离性能的预测模型仍需进一步开发。在此，我们使用通过可扩展喷涂改性表面润湿性的金属网，研究了三个分离性能参数，即分离效率、液体侵入压力和质量通量，它们是孔隙几何形状和液体性质的函数。我们表明，制备的膜在侵入压力以下表现出超过98%的分离效率，而侵入压力随着膜孔径的减小而增加。特别地，我们开发了一个通过膜的质量通量的半经验模型。作为我们性能分析的应用实例，我们成功预测了油水混合物单向和双向重力驱动分离的分离时间、膜污染导致的质量通量下降以及给定膜的最大允许分离能力。这项工作通过为分离膜提供选择指南，有助于为实际工业应用设计最佳的基于膜的油水分离系统。
