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
MAO Qian1, YU Yu-duo1, LI Min2, GE Wen-shu1, HE Gao-hong1,2, ZHANG Wen-jun1
1. School of Chemical Engineering, Dalian University of Technology, Panjin 124221, China; 2. State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116023, China
Abstract: 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 dual-carrier emulsion liquid membrane also shows good stability during the separation,with the demulsification ratio of less than 2%.
毛倩, 于玉夺, 李敏, 葛文书, 贺高红, 张文君. 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[J]. 现代化工, 2021, 41(2): 135-139,145.
MAO Qian, YU Yu-duo, LI Min, GE Wen-shu, HE Gao-hong, ZHANG Wen-jun. 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. Modern Chemical Industry, 2021, 41(2): 135-139,145.
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