SOLVENT-EXTRACTION OF LA3-N,N'-DITETRADECYL-N,N'-DIACETIC ACID (EDDAT) IN DICHLOROMETHANE( WITH ETHYLENEDIAMINE)

Ethylenediamine-N,N'-ditetradecyl-N,N'-diacetic acid (EDDAT) was synth esized for the solvent extraction of La3+. EDDAT was prepared from eth ylenediamine-N,N'-diacetic acid (EDDA) and tetradecyl bromide in a bas ic n-amylalcohol-ethanol-water solvent system. The structure of this n ew extracting reagent was identified according to spectroscopic data, i.e. C-13 NMR, H-1 NMR, and elemental analysis results. The solvent ex traction of La3+ with EDDAT in dichloromethane was studied as a functi on of parameters of the aqueous and organic phases. The optimal extrac tion conditions were determined. The extraction yield increased with a decrease in hydrogen ions in the aqueous phase. Stripping of the La3 loaded organic phase was achieved with HCl aqueous solution. The effe ct of stripping as a function of the HCl concentration was also studie d.