中间层构建及其反渗透复合膜性能的探讨  

Discussion on the construction of intermediate layer and the properties of reverse osmosis composite membrane

作　　者：李文远 吕晓龙[1,2] 任凯 谷杰 张慧莹 LI Wenyuan;LYU Xiaolong;REN Kai;GU Jie;ZHANG Huiying(State Key Laboratory of Membrane Separation and Membrane Process,College of Materials Science and Engineering,Institute of Biochemical Engineering,Tiangong University,Tianjin 300387,China;State Key Laboratory of Membrane Materials and Membrane Applications,Tianjin Motimo Membrane Technology Co.,Ltd.,Tianjin 300457,China)

机构地区：[1]省部共建分离膜与膜过程国家重点实验室,材料科学与工程学院,生物化工研究所,天津工业大学,天津300387 [2]膜材料与膜应用国家重点实验室,天津膜天膜科技股份有限公司,天津300457

出　　处：《膜科学与技术》2024年第5期150-155,共6页Membrane Science and Technology

基　　金：国家重点研发计划(2023YFB3810500)。

摘　　要：自制了聚氯乙烯(PVC)超滤基膜,通过多元胺(二乙烯三胺-DETA和哌嗪-PIP)和多元酸(衣康酸-IA、马来酸酐-MAH和柠檬酸-CA)反应形成了基膜表面中间层,采用间苯二胺(MPD)和均苯三甲酰氯(TMC)界面聚合(IP)制备了反渗透(RO)复合膜,讨论了多元胺/多元酸种类(DETA/CA,DETA/MAH,DETA/IA,PIP/IA)、反应次数等对中间层性能和RO膜性能的影响.结果表明,当50℃时,利用3 mol/L二乙烯三胺和0.5 mol/L衣康酸在基膜表面反应4次的中间层所制备的RO复合膜,在2.0 MPa压力下对质量浓度1800 mg/L的氯化钠水溶液脱盐率为97.58%,其水通量为34.8 L/(m^(2)·h·MPa),与空白对照RO膜相比水通量提升41.3%,因此,这种中间层构建的方法为高通量RO复合膜的制备提供了理论依据.In this paper,polyvinyl chloride(PVC)ultrafiltration base membrane was prepared,and through the reaction of polyamines(diethylenetriamine-DETA and piperazine-PIP)and polyacids(itaconic acid-IA,maleic anhydride-MAH and citric acid-CA),intermediate layer of base membrane surface was formed,reverse osmosis(RO)composite membrane was prepared by interfacial polymerization(IP)of m-phenylenediamine(MPD)and trimesoyl chloride(TMC)and the effects of DETA/IA reaction times of polyamines/polyacids(DETA/CA,DETA/MAH,DETA/IA and PIP/IA)on the properties of interlayer and RO film were discussed.It is shown from the result that,at 50℃,for the RO composite membrane prepared by 3 mol/L diethylenetriamine and 0.5 mol/L itaconic acid through reaction for 4 times on the surface of the base membrane,the desalination rate for 1800 mg/L sodium chloride water solution was 97.58%at 2.0 MPa pressure and water flux was 34.8 L/(m^(2)·h·MPa).Compared with the blank control RO membrane,the water flux increased by 41.3%.Therefore,the method of constructing intermediate layer provides a theoretical basis for the preparation of high-flux RO composite membranes.

关 键 词：反渗透膜 界面聚合 膜通量 中间层 

分 类 号：TQ028.8[化学工程]