Acidic phosphoryl podands as components of extraction chromatography material for selective extraction of promethium-147

Abstract

A number of new acidic phosphoryl podands with different substituents in the phosphoryl groups and different polyether chain structure are synthesized. They are used to obtain impregnation-type sorbents. A copolymer of styrene and divinyl benzene (LPS-500 grade) is used as a matrix for sorbent manufacturing. The effect of the structure and amount of supported phosphoryl podand, as well as of the concentration and nature of the acid in the initial solution of rare metals on extraction-chromatographic separation of La³⁺, Nd₃₊, Pm₃₊, and Sm₃₊ in the dynamic mode, is studied. It is found that the developed sorbents are superior with regard to efficiency of separation of these elements from weakly acidic media to the known counterparts synthesized on the basis of the conventionally used extractants: di(2-ethylhexyl)phosphoric acid and N,N,N′,N′-tetra-n-octyldiglycolamide. The possibility of practical application of the obtained sorbents for selective extraction and purification of promethium-147 from a number of associated rare-earth metals from technological solutions of PO Mayak is shown.