Evaluation of hydrodynamic suitability of N,N-didodecyl N′,N′-di-octyl diglycolamide: a potential candidate for minor actinide partitioning

Abstract

An unsymmetrical diglycolamide namely N,N, didodecyl-N 0 ,N 0 -dioctyl diglycolamide developed in our laboratory is evaluated for its hydrodynamic suitability by determining the changes in its physical properties such as density and viscosity as a function of temperature and compared with those of tri n-butyl phosphate and N,N,N 0 ,N 0 -tetraoctyl diglycolamide. The effect of irradiation on density, viscosity and interfacial tension, up to a dose of 1000 kGy are also measured. In addition, the activation energy for the viscous flow (E vis ) were obtained for these pure solvents and their binary mixtures with n-dodecane in the temperature range 20-65°C using the Andrade's equation.

Ligands for f-element extraction used in the nuclear fuel cycle

“…170 In particular, D 3 DODGA (Chart 32) was found to be a good compromise, having a high distribution ratio of trivalent Ln(III) and An(III) (D Eu 4 100, D Am 410 at 2 M HNO 3 ) 170 from HNO 3 medium and low D Sr values, and performed well from the hydrodynamic point of view under severe radioactive environment conditions up to 1000 kGy, while not requiring a phase modifier. 171 A series of modifications of the backbone of TODGA revealed that rigidification increased the D values for the extraction of Am(III) and Eu(III), but provided no differentiation between the two metal ions (D values between 5 and 10 at 2 M HNO 3 ). 172 A different arrangement of the structural elements of DGAs Chart 32 (two tertiary amides and an ether group) on a conformationally constrained structure led to the synthesis of 7-oxabicyclo[2.2.1]heptane-2,3-dicarboxamides (OBDA, Chart 33).…”

Solvent extraction of U(VI) by N,N-dimethyl-N′,N′-dioctylsuccinylamide and N,N-dimethyl-N′,N′-didecylsuccinylamide in cyclohexane

“…Diamides extractants have attracted widespread attention recently to study the possible use in nuclear fuel reprocessing. Tetraalkyl malonamide [5,6], tetrabutyl succinamide [7,8] and tetrabutyl 3-oxo-diglycolamide [9][10][11] showed good extraction properties for U(VI), Th(IV) and fission products from nitric acid solutions. Mowafy and Mohamed [12] studied the extraction of U(VI) and Th(IV) from nitric acid solutions with N,N,N 0 ,N 0 -tetrabutylsuccinamide (TBSA) in toluene.…”

“…Mowafy and Mohamed [12] studied the extraction of U(VI) and Th(IV) from nitric acid solutions with N,N,N 0 ,N 0 -tetrabutylsuccinamide (TBSA) in toluene. Wu et al [9] found that excess of TBSA could react with uranyl to form [UO 2 (TBSA) 3 ] 2? , in which two TBSA ligands were in tridentate mode and the third was in monodentate mode in ionic liquid [Bmim] [NTf2].…”