使用绿色二元稀释剂TEGDA/TOTM制备ECTFE膜及其在膜冷凝器中的性能

ECTFE Membrane Fabrication Using Green Binary Diluents TEGDA/TOTM and Its Performance in Membrane Condenser.

作者信息

Yu Songhong, Huang Yu, Zhang Lixun, Wang Qian, Wang Zhaohui, Cui Zhaoliang, 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 Jul 31;12(8):757. doi: 10.3390/membranes12080757.

DOI:10.3390/membranes12080757

PMID:36005672

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9414311/

Abstract

Poly(ethylene-chlorotrifluoroethylene) (ECTFE) membrane is a hydrophobic membrane material that can be used to recover water from high-humidity gases in the membrane condenser (MC) process. In this study, ECTFE membranes were prepared by the thermally induced phase separation (TIPS) method using the green binary diluents triglyceride diacetate (TEGDA) and trioctyl trimellitate (TOTM). Thermodynamic phase diagrams of the ECTFE/TEGDA: TOTM system were made. The effects of the diluent composition and cooling rate on the structure and properties of the ECTFE membranes were investigated by characterizing the SEM, contact angle, mechanical properties, pore size and porosity. The results showed that ECTFE membranes with cellular structure were successfully prepared and exhibit good mechanical properties. Moreover, increasing the TOTM content in the binary diluents and decreasing the cooling rate could effectively improve the mean pore size of the ECTFE membranes, but the increase in TOTM content reduced the mechanical properties. During the MC process, the water recovery performance of ECTFE membranes increased with the increase in the mean pore size of the membranes, and the condensation flow and water recovery of membrane prepared at 20% TOTM were 1.71 kg·m·h and 54.84%, respectively, which were better than the performance of commercial hydrophobic PVDF membranes in the MC. These results indicated that there is good potential for the application of ECTFE membranes during the MC process.

摘要

聚（乙烯-氯三氟乙烯）（ECTFE）膜是一种疏水膜材料，可用于膜冷凝器（MC）工艺中从高湿度气体中回收水。在本研究中，采用绿色二元稀释剂甘油二乙酸酯（TEGDA）和偏苯三酸三辛酯（TOTM）通过热致相分离（TIPS）法制备ECTFE膜。绘制了ECTFE/TEGDA:TOTM体系的热力学相图。通过扫描电子显微镜（SEM）、接触角、力学性能、孔径和孔隙率表征，研究了稀释剂组成和冷却速率对ECTFE膜结构和性能的影响。结果表明，成功制备了具有泡孔结构的ECTFE膜，且其具有良好的力学性能。此外，增加二元稀释剂中TOTM的含量并降低冷却速率可有效提高ECTFE膜的平均孔径，但TOTM含量的增加会降低力学性能。在MC工艺过程中，ECTFE膜的水回收性能随膜平均孔径的增加而提高，在TOTM含量为20%时制备的膜的冷凝通量和水回收率分别为1.71 kg·m·h和54.84%，优于MC工艺中商用疏水聚偏氟乙烯（PVDF）膜的性能。这些结果表明，ECTFE膜在MC工艺中具有良好的应用潜力。