ECTFE膜性能对盐水精制过程的影响
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摘要
用热致相分离法制备乙烯-三氟氯乙烯共聚物(ECTFE)膜,对ECTFE、聚醚砜(PES)、聚四氟乙烯(PTFE)膜材料盐水精制的性能进行比较。对ECTFE膜进行亲水改性,进一步表征改性前后ECTFE膜盐水精制性能,并对过滤过程中的膜污染行为进行分析。结果表明:当盐水精制运行180 h以内时,ECTFE膜在盐水精制工艺中有更好的分离性能和选择性;当ECTFE膜平均孔径为210 nm时,膜的渗透通量最大,截留效果好,亲水改性也有利于提高ECTFE膜在盐水过滤工艺中的抗污染性能。
Poly(ethylene chlorotrifluoroethylene)(ECTFE) membranes were prepared by thermally induced phase separation(TIPS). The performance of ECTFE membranes were compared with polyether sulfone(PES) membranes and polytetrafluoroethylene(PTFE) membranes in the brine refining process. The hydrophilic modification of ECTFE membranes were carried out, and the properties of the original membranes and modified membranes in the brine refining process were characterized with the analysis of the membrane fouling behavior in the filtration process. Results showed that ECTFE membrane had good separation performance and selectivity in the application of brine refining during 180 h. When the average pore size of ECTFE membrane was 210 nm, the membrane had the highest permeation flux. Hydrophilic modification improved the membrane antifouling performance in the application for brine refining.
Poly(ethylene chlorotrifluoroethylene)(ECTFE) membranes were prepared by thermally induced phase separation(TIPS). The performance of ECTFE membranes were compared with polyether sulfone(PES) membranes and polytetrafluoroethylene(PTFE) membranes in the brine refining process. The hydrophilic modification of ECTFE membranes were carried out, and the properties of the original membranes and modified membranes in the brine refining process were characterized with the analysis of the membrane fouling behavior in the filtration process. Results showed that ECTFE membrane had good separation performance and selectivity in the application of brine refining during 180 h. When the average pore size of ECTFE membrane was 210 nm, the membrane had the highest permeation flux. Hydrophilic modification improved the membrane antifouling performance in the application for brine refining.
引文
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[3] 王开文,顾俊杰,邢卫红.盐水中沉淀物对气升式陶瓷膜过滤性能的影响[J].高校化学工程学报,2012,26(7):775.
[4] 周波,林亚凯,马文中,等.热致相分离法制备乙烯-三氟氯乙烯共聚物微孔膜[J].高等学校化学学报,2012,33(11):2585.
[5] SIMONE S,FIGOLI A,SANTORO S,et al.Preparation and characterization of ECTFE solvent resistant membranes and their application in pervaporation of toluene/water mixtures[J].Separation and Purification Technology,2012,90:147.
[6] PAN J,XIAO C,HUNG Q L,et al.Fabrication and properties of poly(ethylene chlorotrifluoroethylene) membranes via thermally induced phase separation(TIPS)[J].RSC Advances,2015 ,5(56):45249.
[7] YAO N C,CHAU J,ELELE E,et al.Characterization of microporous ECTFE membrane after exposure to different liquid media and radiation[J].Journal of Membrane Science ,2017,doi:10.1016/j.memsci.2017-03-07.
[8] 梅德俊,朱海霖,郭玉海,等.聚四氟乙烯平板膜的亲水改性研究[J].水处理技术,2016,42(4):42.
[9] 程毅丽,康国栋,贾静璇,等.聚四氟乙烯中空纤维膜的多巴胺自聚表面改性及性能研究[J].高校化学工程学报,2015,29(5):1259.
[10] 孙丽,陈桂娥,刘询,等.聚四氟乙烯膜亲水改性研究进展[J].化学世界,2013,60(增刊):77.
[11] 孙海翔,张林,陈欢林,等.聚四氟乙烯膜的亲水化改性研究进展[J].化工进展,2006,25(4):378.
[12] 田云霞,徐莹,王新,等.聚四氟乙烯膜表面的苯胺聚合沉积亲水改性研究[J].膜科学与技术,2009,29(6):40.
[13] SONG H M,YU H W,ZHU L J,et al.Durable hydrophilic surface modification for PTFE hollow fiber membranes[J].Reactive and Functional Polymers,2017,114(3):110.
[14] 陆茵,胡少媚,顾熙棠,等.科研用平板刮膜机[J].膜科学与技术,2002,22(2):54.
[15] 吕常文.微孔滤膜孔隙率的简易测定法介绍[J].膜科学与技术,1989,9(1):42.