The possibility of using a mixture of 1-(2-neononylamidoethyl)-2-neononyl-2-imidazoline:N, N′-(iminodiethane-2,2′-diyl)di(neodecanamide):neodecanoic acid (in molar ratio 1:1:2) for the rare earth metals extraction was demonstrated. A novel reagent was synthesized in one step by thermal condensation of diethylenetriamine with neodecanoic acid. The synthesized product (diethylenetriamine:neodecanoic acid molar ratio 1:3, Т = 250±5°С °С, 1.5−2 h) was a mixture of 1-(2-neononylamidoethyl)-2-neononyl-2-imidazoline (35−37%), N, N′-(iminodiethane-2,2′-diyl)di(neodecanamide) (30−32%), and unchanged neodecanoic acid (30−33%). The solvent extraction of erbium(III), representing heavy lanthanides, from nitrate solutions has been studied using the model mixture and the synthesized reagent in toluene with 15 % (v/v) of n-decanol. The effect of the aqueous phase acidity has been investigated, and the loading capacities of the mixtures for Er(III) were determined. The possibility of the separation of the Er–Y pair was demonstrated (β = 3.5).
10.33184/bulletin-bsu-2024.3.6
