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Extraction of Actinides and Lanthanides from Nitric Acid Solution by Malonamides

Solvent extraction from nitric acid solutions by three different malonamides; N,N'-dimethyl-N,N'-dibutyloctadecyl malonamide, N,N'-dimethyl-N,N'-diphenyltetradecyl malonamide and N,N'-dimethyl-N,N'-dicyclohexyltetradecyl malonamide, dissolved in iert-butylbenzene, has been investigated. The dependence on nitric acid concentration, nitrate concentration and malonamide concentration on the extraction of U, Th, Am, Eu, Tb and HN03 is described. The influence of the different malonamide structures on the extraction behaviour is discussed. The phenylsubstituted malonamide, DMDPHTD, is able to extract metal species even from high nitric acid concentrations. The experimental data indicate both a coordination mechanism and an ion-pair extraction mechanism depending on the nitric acid concentration.