利用纳滤膜分离精制饱和卤水的研究  

Study on refining saturated brine by nanofiltration membrane

作　　者：徐天男 李建阳 邵兰燕 王月香 袁俊生 Xu Tiannan;Li Jianyang;Shao Lanyan;Wang Yuexiang;Yuan Junsheng(School of Petrochemical Engineering,Fuzhou University,Fuzhou 350100,China;Jingjiang Green-headwater Environmental Technology Co.,Ltd.;College of Chemical Engineering and Materials,Quanzhou Normal University;Research Center of Seawater Utilization Technology of Ministry of Education,Hebei University of Technology)

机构地区：[1]福州大学石油化工学院,福建福州350100 [2]晋江清源津工环保科技有限公司 [3]泉州师范学院化工与材料学院 [4]河北工业大学海水资源高效利用化工技术教育部工程研究中心

出　　处：《无机盐工业》2020年第12期40-45,共6页Inorganic Chemicals Industry

基　　金：福建省海洋高新产业发展专项闽海洋高新[2015]13号。

摘　　要：针对饱和卤水直接制碱过程需要去除硫酸根、钙离子、镁离子(SO4^2-、Ca^2+、Mg^2+)等杂质离子的问题,探索了利用纳滤膜分离精制饱和卤水新工艺。通过考察NF270、DL2540、ESNA13种类型纳滤膜的透过通量和离子截留率,确定了选用DL2540为实验用膜;分析了DL2540纳滤膜对离子的截留性能和对盐田饱和卤水的分离性能及其对饱和卤水精制的效果。结果表明,增加同离子浓度、降低压力有利于不同价态阳离子、阴离子间的分离,DL2540纳滤膜对盐田饱和卤水中SO4^2-、Ca^2+、Mg^2+截留率分别达到95%以上、30%~50%、30%~70%,对Na^+、Cl^-截留率均低于15%,进一步证明DL2540纳滤膜具有较好的稳定性和二价离子截留效果,在饱和卤水精制上展示出较好的应用前景。Aiming at the problem that SO4^2-,Ca^2+,Mg^2+and other impurity ions need to be removed in the process of direct alkali production from saturated brine,a new process for separating and refining saturated brine with nanofiltration membrane was explored.By examining the flux and ions rejection rate of three types of NF270,DL2540 and ESNA1 nanofiltration membranes,DL2540 was chosen as the experimental membrane.The effects of DL2540 nanofiltration membrane on ions rejection rate,separation performance of saturated brine from salt field and the refining effect of saturated brine were analyzed respectively.The results showed that increasing the concentration of the ions and reducing the pressure was beneficial to the separation of cations and anions with different valences.The rejection rates of SO4^2-,Ca^2+and Mg^2+in the saturated brine of salt field reached 95%above,30%~50%and 30%~70%,respectively.The rejection rates of DL2540 nanofiltration membrane on Na+and Cl-were both lower than 15%,which further proved that DL2540 nanofiltration membrane has better stability and divalent ions rejection effect,and showed promising application prospect in saturated brine purification.

关 键 词：饱和卤水 膜分离 纳滤膜 脱硬 

分 类 号：TQ114[化学工程—无机化工]