A novel method for synthesis of styryl phosphonate monoester and its application in La(Ⅲ) extraction  

作　　者：Kaihua Huang Yun Jia Shuai Wang Jia Yang Hong Zhong 

机构地区：[1]College of Chemistry and Chemical Engineering,Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources,Central South University,Changsha 410083,China

出　　处：《Journal of Rare Earths》2020年第6期649-656,共8页稀土学报（英文版）

基　　金：National High Technology Research and Development Program of China(863 Program,2013AA064102);Hunan Provincial Science and Technology Plan Project,China (2016TP1007)。

摘　　要：Herein,styryl phosphonate monoester(SPE) was synthesized and first introduced as rare earth extractant.The solvent extraction of lanthanum(Ⅲ) from nitrate solution using styryl phosphonate mono-isooctyl ester(SPE108),di-2-ethylhexyl phosphoric acid(D2 EHPA) and 2-ethylhexyl phosphonic acidmono-2-ethylhexyl ester(EHEHPA) as extractants was investigated.The effects of experimental parameters including equilibrium time,extractant concentration,aqueous pH,phase ratio and salt concentration on the extraction process were studied.The results indicate that the extraction ability and capacity of the extractants follow the order:SPE108> D2 EHPA> EHEHPA.What’s more,the extraction process is less affected by ammonium sulfate in the aqueous phase with SPE108.The results of the separation between lanthanum and adjacent lanthanides(Ce,Pr,Nd,Sm) show that SPE108 can separate lanthanides efficiently at low pH.The extraction mechanism of SPE108 is proved to be similar to D2 EHPA,and the density functional theory(DFT) calculation results infer that SPE108 exhibits superior extraction ability due to its strong electron-accepting ability.

关 键 词：Styryl phosphonate monoester Rare earth EXTRACTION EXTRACTANT 

分 类 号：TQ265.1[化学工程—有机化工] TF845[冶金工程—有色金属冶金]