JRP 06-15
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ContactProf. Christian EkbergChalmers University of Technology, Kemivagen 10,41296 Gothenburg, Sweden  +46 31 772 2801 
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The characterization of the complexes formed during the kinetics experiments and irradiation experiments in organic systems containing 6,6'-bis-(5,6-R-1,2,4-triazin-3-yl)-2,2'-bipyridines like molecules (BTBPs)Status
Goals6,6'-bis-(5,6-R-1,2,4-triazin-3-yl)-2,2'-bipyridines like molecules are currently used as potential candidates for a scale-up process for separation and transmutation purposes. For this goal to be achieved, a number of factors must be known, like the solvent system, equilibrium data, kinetics data (since these will to a large extent govern the choice of the type of the contactor), radiolysis effects and of course all the physical characteristics of the system. In the present proposal just some kinetics and radiolysis deviant behaviour observed during previous series of experiments will be taken into consideration. Expected results
The explanation requires a molecular level characterization, the complexes formed with the ligand and 241Am and 152Eu are to be characterized. All the experimental data necessary to build these complexes are known, thus the time necessary for this part of the experiment can be easily controlled. On the kinetics section three organic systems containing CyMe4-BTBP dissolved in nitrobenzene, p-anisaldehyde and cinnamaldehyde reach extraction equilibrium after different times and the distribution values differ from one system to another. The only difference between the systems is the diluent since the concentration of the ligand and the aqueous phase is constant. In the last two systems Eu is significantly less extracted and no good explanation was found so far. Since the same extraction mechanism is usually assumed for both Am and Eu the reasons for the different kinetics behaviour must be found elsewhere. It was previously demonstrated that differences in extraction kinetics exist but not that they change in a non parallel fashion. On the radiolysis part, four organic systems are irradiated at low doses during a period of time, the systems contain C5-BTBP and CyMe4-BTBP dissolved in cyclohexanone, hexanol and octanol. Reports |
