二(2-乙基己基)磷酸酯协同二苯并-18-冠醚-6高效分离浓盐水中钙镁离子乳化液膜的研究  

Study on efficient separation of calcium and magnesium in concentrated brine by emulsion liquid membrane with bis( 2-ethylhexyl) phosphate and dibenzo-18-crown-6 as dual carriers

作　　者：毛倩 于玉夺 李敏[2] 葛文书 贺高红[1,2] 张文君[1] MAO Qian;YU Yu-duo;LI Min;GE Wen-shu;HE Gao-hong;ZHANG Wen-jun(School of Chemical Engineering,Dalian University of Technology,Panjin 124221,China;State Key Laboratory of Fine Chemicals,Dalian University of Technology,Dalian 116023,China)

机构地区：[1]大连理工大学化工学院,辽宁盘锦124221 [2]大连理工大学精细化工国家重点实验室,辽宁大连116023

出　　处：《现代化工》2021年第2期135-139,145,共6页Modern Chemical Industry

基　　金：国家重大科研仪器研制项目(21527812);大连理工大学基本科研业务费(DUT20LK43)。

摘　　要：针对现有钙镁离子较低的分离选择性,以双载体乳化液膜为分离钙镁离子的介质,二(2-乙基己基)磷酸酯(D2EHPA)和二苯并-18-冠醚-6(DB18C6)为金属离子运输的双载体,草酸钠(Na2C2O4)为内相萃取剂,利用载体的高结合能力和独特结构实现钙离子的高选择性分离,并间接得到高浓度镁离子的外水相浓盐水。结果表明,两载体的协同作用有效促进了钙离子的萃取,30 min内钙离子萃取率达99%以上,钙离子的协萃因子为11.54,而镁离子协萃因子仅0.58,且外水相镁离子摩尔比由75.81%变为99.74%。同时,该双载体乳化液膜在分离过程中展现出良好的稳定性,破乳率不超过2%。In view of current technology’s low separation selectivity between calcium and magnesium,a dual-carrier emulsion is proposed for the separation of magnesium from calcium in solution.Taking bis( 2-ethylhexyl) phosphate and dibenzo-18-crown-6 as two carriers for transportation of metal ions,sodium oxalate as internal extractant,calcium ion is selectively and efficiently separated by relying on strong chemical combination ability and unique structure of carriers,meanwhile the external solution with high concentrated of magnesium ion is indirectly obtained. It is shown from results that synergistic effect between two carriers promotes the extraction of calcium ions effectively. Within 30 minutes,the extraction ratio of calcium ions achieves 99%,with synergistic extraction factors of 11. 54 and 0. 58 for Ca2+ and Mg2+ respectively,while the content of magnesium ion in the external solution increases from 75. 81% to 99. 74%. This dualcarrier emulsion liquid membrane also shows good stability during the separation,with the demulsification ratio of less than 2%.

关 键 词：乳化液膜 双载体 钙镁离子分离 协同萃取 稳定性 

分 类 号：TQ028.8[化学工程] X703[环境科学与工程—环境工程]