Extraction of lanthanides by polysulfone microcapsules containing EHPNA. II. Coaxial microfluidic method  

作　　者：王月 靖宇 侯海龙 徐建鸿 王运东 

机构地区：[1]The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University [2]School of Chemical Engineering and Environment,Beijing Institute of Technology

出　　处：《Journal of Rare Earths》2015年第7期765-775,共11页稀土学报（英文版）

基　　金：Project supported by the National Key Basic Research Program of China(2012CBA01203);the Specialized Research Fund for Doctoral Program of Higher Education of MOE of China(20130002110018);the State Key Laboratory of Chemical Engineering Key Program(SKL-Ch E-14T01)in the State Key Laboratory of Chemical Engineering of Tsinghua University

摘　　要：Controllable preparation of small-size polysulfone microcapsules （MC） containing 2-ethylhexylphosphonic acid mono-2- ethylhexyl ester （EHPNA） by coaxial microfluidic method was focused on. N2 gas was used as continuous phase to disperse the polymer solution. The influence ofpolysulfone （PSF） content in the polymer solution and N2 gas flow rate on the structural properties and loading ratio of microcapsules was investigated. The mean diameter of prepared microcapsules was between 0.90 and 1.60 mm. Ultrasound method was adopted to import EHPNA into microcapsules. A very high extractant loading ratio of 6.21 g-EHPNA/g-PSF was achieved when the pore volume was 6.89 mL/g. The extraction performance was determined with lanthanides as the recovered components and with the prepared microcapsules as the separation agent. Close-packed microcapsules enjoyed a fast extraction kinetics. The maximum uptakes of La^3＋, Sm^3＋ and Er^3＋ were 3.02 ×10^4 mol/g, 8.05× 10^4 mol/g and 5.58× 10^4 tool/g, respectively. Microcapsules were reused seven times and showed very good stability. It is promising to apply the microcapsules into the extraction column and realize continuous operation.Controllable preparation of small-size polysulfone microcapsules （MC） containing 2-ethylhexylphosphonic acid mono-2- ethylhexyl ester （EHPNA） by coaxial microfluidic method was focused on. N2 gas was used as continuous phase to disperse the polymer solution. The influence ofpolysulfone （PSF） content in the polymer solution and N2 gas flow rate on the structural properties and loading ratio of microcapsules was investigated. The mean diameter of prepared microcapsules was between 0.90 and 1.60 mm. Ultrasound method was adopted to import EHPNA into microcapsules. A very high extractant loading ratio of 6.21 g-EHPNA/g-PSF was achieved when the pore volume was 6.89 mL/g. The extraction performance was determined with lanthanides as the recovered components and with the prepared microcapsules as the separation agent. Close-packed microcapsules enjoyed a fast extraction kinetics. The maximum uptakes of La^3＋, Sm^3＋ and Er^3＋ were 3.02 ×10^4 mol/g, 8.05× 10^4 mol/g and 5.58× 10^4 tool/g, respectively. Microcapsules were reused seven times and showed very good stability. It is promising to apply the microcapsules into the extraction column and realize continuous operation.

关 键 词：EXTRACTION MICROCAPSULE rare earths EHPNA MICROFLUID 

分 类 号：TF845[冶金工程—有色金属冶金]