Nitric Acid Extraction into the TODGA/TBP Solvent

Nitric Acid Extraction into a TODGA Solvent Modified with 1-Octanol

“…Although the best fit was obtained when HNO3•2TODGA and 4TODGA species had non-zero stability constants, the 95% confidence limits for the predicted values took in zero and it was found that there was very little loss in model accuracy if these species were omitted. For the remaining adducts the fitting process resulted in stability constants as in Table 3 below: These constants differ from those reported in a previous study [ 24 ]. The differences are explained by the use of different activity models and the use of the 2HNO3•2TODGA adduct instead of the HNO3•2TODGA adduct.…”

“…Various modifiers have been tried (e.g. tri-butyl phosphate [ [23][24], lipophilic alcohols [ [25][26], monoamides [27][28][29], DMDOHEMA (N,N'-dimethyl-N,N'-dioctyl-2-(2-hexyloxy-ethyl)malonamide) [ [30][31]). A solvent comprising 0.2 mol/L TODGA with 5 v/v% octanol in an inert diluent such as odourless kerosene or hydrogenated tetra propylene (TPH) has been developed [ 32 ] and used [ 14 ] in recent European research programmes.…”

Effect of diluent on the extraction of europium(iii) and americium(iii) with N,N,N′,N′-tetraoctyl diglycolamide (TODGA)

“…It is well known that extraction of HNO 3 via some organic phases containing TODGA occurs. 33,[38][39][40][41]49,52 Therefore, two sets of experiments were performedwith the organic phase presaturated with 4 M HNO 3 as well as with a nonpreconditioned set of diluents. Saturation of the organic solvent (diluent and TODGA) was performed by contacting the solvent with the same volume of 4 M HNO 3 by shaking machine for 60 minutes and then the phases were let to separate by gravity for 120 minutes.…”

“…The family of diglycolamides are known extracting agents for trivalent lanthanides and actinides in solvent extraction, with expected application in partitioning and transmutation of a nuclear fuel [22][23][24][25] and in radiopharmaceutical industry for 225 Ac production. [26][27][28][29] While the behavior of diglycolamides with respect to equilibrium distribution ratios, acid extraction and kinetics was extensively evaluated, [30][31][32][33][34][35][36][37][38][39][40][41][42] the effect of the diluent on the extraction was evaluated only in a few studies. [42][43][44][45][46][47] From the available data, correlations of diluent properties against the distribution ratios seems rather difficult.…”

A comparative study on the coordination of diglycolamide isomers with Nd(iii): extraction, third phase formation, structure, and computational studies

“…The upward trend of the distribution ratio can be explained by the mass action law and the salting-out effect of NO 3 À with increasing HNO 3 concentration. 45,46 The competitive effect of H + suppresses the extraction of Nd(III). The effects of nitrate concentration and H + concentration on D Nd are shown in Fig.…”