Binary extraction of lanthanide(III) chlorides using carboxylates and dialkylphosphates of secondary and tertiary amines

•We study a binary extractants based on carboxylates and dialkylphosphates of verious amines and their mixtures.•We investigate selectivity change of lanthanide extraction in mixtures of few binary extractants.•In binary mixtures of extractants found synergistic effects.

The use of binary extractants based on carboxylates and dialkylphosphates of secondary and tertiary amines and their mixtures for the separation of lanthanide (III) ions has been investigated. It is established that the solutions of these extractants in non-polar organic solvent extract lanthanide chlorides from aqueous phase according to the laws of binary extraction. The synergetic effect for the system of di-(2-ethylhexyl)carboxylate, caprinate of di-n-octylammonium and tri-n-octylammonium has been found.