用于通过膜冷凝器对气流进行除湿的ECTFE多孔膜的制备

Preparation of ECTFE Porous Membrane for Dehumidification of Gaseous Streams through Membrane Condenser.

作者信息

Pan Jun, Chen Kun, Cui Zhaoliang, Bamaga Omar, Albeirutty Mohammed, Alsaiari Abdulmohsen Omar, Macedonio Francesca, Drioli Enrico

机构信息

State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China.

National Engineering Research Center for Special Separation Membrane, Nanjing Tech University, Nanjing 211816, China.

出版信息

Membranes (Basel). 2022 Jan 1;12(1):65. doi: 10.3390/membranes12010065.

DOI:10.3390/membranes12010065

PMID:35054591

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8781967/

Abstract

Due to the good hydrophobicity and chemical resistance of poly(ethylene trifluoroethylene) (ECTFE), it has been an attractive potential material for microfiltration, membrane distillation and more. However, few porous hydrophobic ECTFE membranes were prepared by thermally induced phase separation (TIPS) for membrane condenser applications. In this work, the diluent, di-n-octyl phthalate (DnOP), was selected to prepare the dope solutions. The calculated Hassen solubility parameter indicated that ECTFE has good compatibility with DnOP. The corresponding thermodynamic phase diagram was established, and it has been mutually verified with the bi-continuous structure observed in the SEM images. At 30 wt% ECTFE, the surface contact angle and liquid entry pressure reach their maximum values of 139.5° and 0.71 MPa, respectively. In addition, some other basic membrane properties, such as pore size, porosity, and mechanical properties, were determined. Finally, the prepared ECTFE membranes were tested using a homemade membrane condenser setup. When the polymer content is 30 wt%, the corresponding results are better; the water recovery and condensed water yield is 17.6% and 1.86 kg m h, respectively.

摘要

由于聚（乙烯-三氟乙烯）（ECTFE）具有良好的疏水性和耐化学性，它一直是微滤、膜蒸馏等领域具有吸引力的潜在材料。然而，通过热致相分离（TIPS）制备用于膜冷凝器应用的多孔疏水ECTFE膜却很少。在这项工作中，选择邻苯二甲酸二正辛酯（DnOP）作为稀释剂来制备铸膜液。计算得到的哈森溶解度参数表明ECTFE与DnOP具有良好的相容性。建立了相应的热力学相图，并与扫描电子显微镜图像中观察到的双连续结构相互验证。在ECTFE含量为30 wt%时，表面接触角和液体进入压力分别达到最大值139.5°和0.71 MPa。此外，还测定了一些其他基本的膜性能，如孔径、孔隙率和机械性能。最后，使用自制的膜冷凝器装置对制备的ECTFE膜进行了测试。当聚合物含量为30 wt%时，相应的结果更好；水回收率和冷凝水产量分别为17.6%和1.86 kg m h。