Malonamides extracting properties

Meridiano, Y., Berthon, L., Lagrave, S., Crozes, X., Sorel, C., Testard, F., Zemb, T. 2008. Correlation between aggregation and extracting properties in solvent extraction systems Extraction of actinides (IB) and lanthanides (III) by a malonamide in non acidic media. ATALANTE 2008 Nuclear Fuel Cycles for a Sustainable Future, May, Montpellier, France. 

F. Testard, P. Bauduin, L. Martinet, B. Abecassis, L. Berthon, and Madic C. Selfassembling properties of malonamide extractants used in separation processes. Radiochim. Acta, 96 1-8, 2008. 

Extracting Properties. Extraction efficiency of malonamides was checked after gamma radiolysis ... 

Molecules that self-assemble into reverse micelles with low surfactant properties are generally efficient extractants (such as HDEHP, TBP, malonamides, etc.). Their adsorptions at the interface permit the complexation of the aqueous solute and their low surfactant properties permits the avoidance of the formation of very stable emulsion. Hence, ions are extracted, but typically there is less than one water molecule per ion extracted. Exact determination of coextracted water is still important, however, for interpreting the conductivity values and for evaluating the polar core volumes. Typical values are found for the Hamaker constant, because polar cores are supersaturated salt solution. 

In the context of the DIAMEX-SANEX process development, the stability of the solvent (a mixture of malonamide and HDEHP extractants in alkane) was studied in the MARCEL loop (y-irradiation followed by alkali treatments). No accumulation of HDEHP degradation products was observed, and most of the physical and chemical properties of the solvent were maintained (5). 

---