冠醚-1,2-二氯乙烷在苦味酸体系中对轻希土元素的萃取

EXTRACTION OF LIGHT RARE EARTH IN PICRIC ACID MEDIUM WITH CROWN ETHERS-1, 2-DICHLOROETHANE

摘要: 本文在文献1的基础上,研究了二环己基-18-冠-6(DC18C6)和二环己基-15-冠-5(DC15C5)在苦味酸体系中对La~(3+),Ce~(3+),Pr~(3+),Nd~(3+),Sm~(3+),Eu~(3+),Gd~(3+)七个轻希土元素的萃取,求得了萃合常数和萃合物在有机相中的离解常数,并测定了苦味酸在水相对七个希土元素的一级络合常数。

Abstract: Results on the extraction of La3+, Ce3 + , Pr3 + , Nd3+ , Sm3+, Eu3+and Gd3+ in picric acid medium with DC18C6 and DC15C5 in dichloroethane are reported on the basis of the extraction of picric acid with crown ethers. The extraction constants and the dissociation constants of extracted compounds in the organic phase are calculated. The first order complexing constants of the seven rare earth elements by picric acid are determined.