Extraction and separation of thorium and rare earths with 5,11,17,23-tetra (diethoxyphosphoryl)-25,26,27,28-tetraacetoxycalix[4]arene

作     者：李艳玲 卢有彩 白彦 廖伍平 

作者机构：State Key Laboratory of Rare Earth Resource UtilizationChangchun Institute of Applied ChemistryChinese Academy of Sciences 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2012年第30卷第11期

页      面：1142-1145页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：Project supported by National Basic Research Program of China (2012CBA01206) National Natural Science Foundation of China (51074148,51222404,91026024) 

主　　题：thorium rare earths phosphorylated calixarene solvent extraction 

摘      要：A calixarene derivative, 5,11,17,23-tetra（diethoxyphosphoryl）-25,26,27,28-tetraacetoxycalix[4]arene （L）, was studied for the extraction and separation of thorium and rare earths in nitrate medium. Thorium was extracted into the organic phase by a complex of Th（NO3）4·L with the logarithm of the equilibrium constant of 2.77. Thermodynamic functions, AH, AG and AS were calculated to be -2.49, -15.55 kJ/mol and 44.53 J/（mol·K）, respectively. The results indicated that this calixarene derivative might be used to separate thorium from rare earths and the separation factors were larger than 26. However, the salting-out agents affected the separation.