Rare earth extractant compounds having the following structure:
wherein R
1
, R
2
, R
3
, and R
4
are independently selected from alkyl groups containing 1-30 carbon atoms and optionally containing an ether or thioether linkage connecting between carbon atoms, provided that the total carbon atoms in R
1
, R
2
, R
3
, and R
4
is at least 12; R
5
and R
6
are independently selected from hydrogen atom and alkyl groups containing 1-3 carbon atoms; and provided that at least one of the conditions (i)-(iv) apply as follows: presence of a distal branched group in at least one of R
1
-R
4
(condition i), asymmetry in R
1
-R
4
(condition ii), presence of amine-containing ring (condition iii), or presence of lactam ring (condition iv). Also described are hydrophobic water-insoluble solutions containing at least one extractant compound of Formula (1), as well as method for extracting rare earth elements from aqueous solution by contacting the aqueous solution with the water-insoluble solution.
具有以下结构的稀土萃取剂化合物:其中R1、R2、R3和R4分别从含有1-30个
碳原子的烷基基团中独立选择,并且可选地包含连接
碳原子之间的醚或
硫醚连接,前提是R1、R2、R3和R4中的总
碳原子至少为12;R5和R6分别从
氢原子和含有1-3个
碳原子的烷基基团中独立选择;并且至少应用以下条件中的一种(i)-(iv):至少在R1-R4中的一个中存在远端支链基团(条件i),R1-R4中的不对称性(条件ii),存在胺基环(条件iii),或存在内
酰胺环(条件iv)。还描述了包含至少一种Formula(1)的萃取剂化合物的疏
水水不溶性溶液,以及通过将
水不溶性溶液与
水溶液接触来从
水溶液中萃取稀土元素的方法。