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 

机构地区：[1]State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences

出　　处：《Journal of Rare Earths》2012年第11期1142-1145,共4页稀土学报（英文版）

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

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.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.

关 键 词：THORIUM rare earths phosphorylated calixarene solvent extraction 

分 类 号：O614.33[理学—无机化学]