一种新型荷电纳滤膜的制备及其在镁锂分离中的应用  

Preparation of Novel Charged Composite Nanofiltration Membrane for Separation of Mg^(2+)and Li^(+)

作　　者：施盈盈 谭惠芬[2] 程新[2] 潘窔伊 张宇 潘巧明[2] SHI Yingying;TAN Huifen;CHEN Gxin;PAN Yaoyi;ZHANG Yu;PAN Qiaoming(Lanxing(Hangzhou)Membrane Industry Company,311103;Hangzhou Water Treatment Technology Research and Development Center,310012:Hangzhou,China)

机构地区：[1]蓝星(杭州)膜工业有限公司,311103 [2]杭州水处理技术研究开发中心有限公司,浙江杭州310012

出　　处：《水处理技术》2023年第8期66-70,共5页Technology of Water Treatment

基　　金：浙江省重点研发计划项目(2021C01173);国家重点研发计划项目(2021YFB3801100);浙江省海水淡化技术研究重点实验室(2012E10001)。

摘　　要：以N,N-双(3-氨丙基)甲胺和均苯三甲酰氯为两相单体,通过调节水相添加剂及后处理PEI涂覆工艺制备了具有高性能的荷正电复合纳滤膜。在0.5 MPa,2000 mg/L氯化镁进料液的条件下,该纳滤膜对氯化镁的截留率为98.6%,通量为63.5 L/(m^(2)·h)。采用荷正电纳滤膜对模拟卤水进行测试,纳滤膜对Mg^(2+)和Li^(+)的截留率为93.8%和5.2%,渗透通量为52.3 L/(m^(2)·h),分离因子S_(Mg,Li)为0.065,表现出极佳的选择分离性。A novel composite nanofiltration membrane was prepared with N,N-bis(3-aminopropyl)methylamine and trimesoyl chloride as monomer respectively in aqueous phase and oil phase.To improve the efficiency,the nanofiltration membrane was optimized by dropping additives in aqueous phase and PEI-coating for post-processing.The rejection of the composite NF membrane for MgCl_(2)(2000 mg/L aqueous solution at 0.5 MPa)was above 98.6%and the permeate flux was approximately 63.5 L/(m^(2)·h).Furthermore,the NF membrane also showed excellent separation performance forMg^(2+)and Li^(+).The rejection of NF membrane for Mg^(2+)and Li^(+)were 93.8%and 5.2%,respectively,and the permeate flux was 52.3 L/(m^(2)·h).The separation factor SMg,Li was 0.065.

关 键 词：荷正电 纳滤膜 改性 镁锂分离 

分 类 号：TQ028.8[化学工程]