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Uranium and neodymium partitioning in alkali chloride melts using low-melting gallium-based alloys

Melchakov S. Y., Maltsev D. S., Volkovich V. A., Yamshchikov L. F., Lisienko D. G., Osipenko A. G., Rusakov M. A.

Nukleonika

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2015

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Vol. 60, No. 4, part 2

915--920

EN

Partitioning of uranium and neodymium was studied in a ‘molten chloride salt – liquid Ga-X (X = In or Sn) alloy’ system. Chloride melts were based on the low-melting ternary LiCl-KCl-CsCl eutectic. Nd/U separation factors were calculated from the thermodynamic data as well as determined experimentally. Separation of uranium and neodymium was studied using reductive extraction with neodymium acting as a reducing agent. Efficient partitioning of lanthanides (Nd) and actinides (U), simulating fission products and fissile materials in irradiated nuclear fuels, was achieved in a single stage process. The experimentally observed Nd/U separation factor valued up to 106, depending on the conditions.

2

Structure and separation quality of various N- and O-donor ligands from quantum-chemical calculations

Trumm M., Schimmelpfennig B., Geist A.

Nukleonika

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2015

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Vol. 60, No. 4, part 2

847--851

EN

Although BTP (2,6-di(1,2,4-triazin-3-yl)pyridine) has been proven to be a highly effective N-donor ligand for the selective An(III)/Ln(III) separation, the origin of its selectivity is still under discussion. We present in this paper quantum-chemical calculations at the density functional theory (DFT) and MP2 level which highlight the role of the aquo ions in the separation process. Furthermore these data will be the reference for future force-field development to investigate the differences in An(III) complexation reactions compared to their Ln(III) counterparts.

3

Wydzielanie CO2 z gazów przy zastosowaniu membran dyfuzyjno-rozpuszczalnościowych (PDMS)

Janusz-Cygan A., Warmuziński K., Jaschik M., Tańczyk M.

Inżynieria i Aparatura Chemiczna

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2010

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Nr 4

26-27

EN

Experimental tests of 2/N2

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Analysis of Membrane Selectivity in the Pressure Driven Transport in terms of the solution-diffusion Models and Irreversible Thermodynamics

Koter S., Kujawski W.

Polish Journal of Chemistry

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2002

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Vol. 76 / nr 11

1637-1647

EN

A comparison of different models has been presented for the pressure driven stationary transport of the mixture of two liquids (1,2) through a membrane. The following models have been discussed: the solution-diffusion model (SD), modified solution-diffusions models (SDI and SDIY) and the "black-box" approach (BB) based on linear irreversible thermodynamics. The set of general equations describing separation factor (SF1/2) has been derived for each model. It has been found that if SF1/2(SD) > 1, then SF1/2(SD) > SF1/2(SDI) > SF1/2(SDIY). For the moderate pressure differences (_p = 10 bar) the SD model and its modifications (SDI, SDIY) yield SF1/2 very close to unity and cannot describe the experimental results. Contrary to them the BB approach is able to predict the experimental SF1/2. SF1/2(BB) increases with the increase of coupling between fluxes, however, its upper limit is determined by the conditions of the positive entropy production and of the positive fluxes.