JRP CALL information
Supported By

European Commission

Short description of the work
The radiolytic behaviour of two innovative hydrophilic complexing agents, PyTri-Diol and PyTri-Tetraol, to be used within an i-SANEX/GANEX process for the selective stripping of minor actinides, was studied after γ-irradiation up to 200kGy. The main objects of the research activity have been:

  • Evaluation of the stripping solvent efficiency.

Batch stripping tests were performed at 25°C on organic phases loaded with 152Eu(III), 239Pu(IV), 241Am(III), 244Cm(III) and 2,4g/L of Lanthanides; the distribution coefficients and the separation factors were determinated, [H+] was monitored at each step.

  • Evaluation of the stripping solvent degradation.

H,C-NMR and 2D-NMR spectroscopy and UV-VIS spectrophotometry analyses were performed on fresh and irradiated stripping solvents to quantify the ligand consumption. The main by-products were detected by ESI-MS and some identification hypotheses have been proposed.

  • Evaluation of the stability constants.

The stability constants of complexes between PyTri-Diol (fresh and irradiated at 200kGy) and trivalent cations (Am and Eu) were estimated by means of UV-VIS spectrophotometry. The protonation of the pyridine nitrogen of PyTri-Diol was confirmed by N-NMR and the protonation constant was estimated from the shifts observed in the H,C NMR spectra.

Main visitor contact data
Name: Eros Mossini
Organisation: Politecnico di Milano

JRP Identification
JRP nr: TALI-C04-15
JRP title: Radiolytic behaviour of irradiated PyTri‐Diol/PyTri‐Tetraol solutions within simulated GANEX process
JRP scope: Scope 1: Actinide separation chemistry

Visited Associated Pooled Facility
Visited APF during the stay: CEA - ATALANTE
Name of the APF Contact Person: Marie‐Christine Charbonnel

Other APF and organisation involved in the JRP
Other organisations involved:
Other APF involved in the project:

Description of the work done at the associated pooled facility
Start date of the stay: 1/10/2015
End date of the stay: 4/5/2015
Quantity of access: 55
Access Unit: Days