Demonstration of a SANEX Process in Centrifugal Contactors using the CyMe₄‐BTBP Molecule on a Genuine Fuel Solution

Lanthanide Speciation in Potential SANEX and GANEX Actinide/Lanthanide Separations Using Tetra-N-Donor Extractants

“…1) has been shown to exhibit potential for use in SANEX separations. 8 However, the kinetics for actinide extraction with CyMe 4 -BTBP are relatively slow, so the addition of a phase transfer catalyst is necessary (e.g. DMDOHEMA) if this extractant is to be used for large-scale partitioning.…”

“…DMDOHEMA) if this extractant is to be used for large-scale partitioning. 8 In an attempt to improve the kinetics of extraction with these tetradentate N-donor extractants, greater conformational rigidity was enforced in the ligand backbone with the synthesis of CyMe 4 -BTPhen (2,9-bis(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-1,2,4-benzotriazin-3-yl)-1,10-phenanthroline; Fig. 1).…”

“…8,9 However, the mode of action of these ligands with lanthanides and actinides in extraction conditions has not been definitively established. We have used X-ray absorption spectroscopy (XAS) to probe lanthanide (Eu, Tb) species which have been extracted into the organic phase in a series of proposed SANEX and GANEX separations that use CyMe 4 -BTPhen and CyMe 4 -BTBP.…”

Complexation of lanthanides, actinides and transition metal cations with a 6-(1,2,4-triazin-3-yl)-2,2′:6′,2′′-terpyridine ligand: implications for actinide(iii)/lanthanide(iii) partitioning

“…The annulated ligand CyMe 4 -BTBP 1 8 ( Figure 1) is currently the most suitable for An(III)/Ln(III) separations, as recently demonstrated under process conditions. 9 It has also been shown that the extraction properties of 1 can be markedly 50 improved by pre-organization of the ligand using a 1, 10-phenanthroline moiety. 10 Despite intensive research, 11 a fundamental understanding of the origins of the high selectivities and excellent extraction properties shown by bis- (1,2,4-triazine) ligands is still limited, with the result that further improvements in ligand design continue to be made largely on a trial and error basis using chemical intuition.…”

N,N,N’,N’-Tetrabutyl-1,10-phenanthroline- 2,9-dicarboxamide as Very Effective Extraction Agent for Trivalent Europium and Americium

“…High selectivity of actinides/lanthanides separation has been achieved when polynitrogen extractants were employed. [1][2][3][4][5][6][7][8][9] However, in spite of very high separation factors for americium/europium separation, some ligands proposed so far have demonstrated some disadvantages (e. g., low chemical stability, slow kinetics, and limited solubility in diluents).…”