高性能NaA沸石膜的制备及其脱盐性能  

Preparation and desalination performance of high quality NaA zeolite membrane

作　　者：邢庆达 周亮 李华征 王金渠 张文君[1] XING Qingda;ZHOU Liang;LI Huazheng;WANG Jinqu;ZHANG Wenjun(School of Petroleum and Chemical Engineering,Dalian University of Technology,Panjin Campus,Panjin 124221,Liaoning,China;Institute of Adsorption and Inorganic Membrane,State Key Laboratory of Fine Chemicals,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]大连理工大学盘锦校区石油与化学工程学院,辽宁盘锦124221 [2]大连理工大学精细化工国家重点实验室吸附与无机膜研究所,辽宁大连116024

出　　处：《化工进展》2017年第11期4170-4175,共6页Chemical Industry and Engineering Progress

基　　金：国家高新技术研究发展计划项目(2015AA03A602)

摘　　要：以廉价大孔α-Al_2O_3管为载体,通过两步变温热浸渍涂晶法,修饰载体表面缺陷,得到连续而均匀的晶种层。在微波辅助作用下,短时间内有效诱导制备出超薄Na A分子筛膜。将其用于渗透汽化脱盐体系中,研究发现,微波加热法制备的超薄Na A沸石膜水通量明显高于常规加热法制备的较厚Na A沸石膜,水的渗透通量随着盐浓度的增大在小范围内有所降低,而操作温度的升高对水的渗透具有明显促进作用,当原料液浓度为0.6mol/L、操作温度85℃时,水通量达到11.03kg/(m2·h)。同时,离子截留率不受操作温度及原料液浓度的影响,始终保持>99.9%。此外,Na A沸石膜在渗透蒸发脱盐中表现出较高的稳定性,75℃条件下,在0.6mol/L的Na Cl溶液中性能可稳定72h以上。该方法在降低制膜成本的同时有效提高了水的渗透通量及离子截留率,表明Na A沸石膜在膜法脱盐的工业化应用领域具有较好的应用前景。A continuous and uniform seed layer was obtained by modifying the surface defects of the low-cost macroporousα-Al2O3tube support by the two-step hot-dip coating method.The ultra-thin NaA zeolite membranes were prepared by microwave-assisted synthesis in a short time,and they were used for pervaporative desalination.It is found that the permeation flux of water decreased slightly with the increase of salt concentration and the increase of operating temperature had a significant effect on the water flux.When the salt concentration of feed was0.6mol/L and the operating temperature was85℃,the water flux reached11.03kg/(m2·h).But the ion retention rate was not affected by the operating temperature and the concentration of the feed solution,and remained at more than99.9%.In addition,NaA zeolite membrane showed high stability in the pervaporative desalination,and the performance was stable for more than72h in the0.6mol/L NaCl solution at75℃.The method can effectively improve water flux and ions rejection while reducing the cost of membrane preparation,which indicates that NaA zeolite membrane has a good application prospect in the field of membrane desalination.

关 键 词：大孔α-Al2O3载体 NAA沸石膜 渗透蒸发 脱盐 微波加热 

分 类 号：TQ174[化学工程—陶瓷工业]