Spectroscopic study of acetohydroxamic acid (AHA) hydrolysis in the presence of europium. Implications in the extraction system studies for lanthanide and actinide separation

2019 ◽  
Vol 43 (39) ◽  
pp. 15714-15722
Author(s):  
Iván Sánchez-García ◽  
Laura J. Bonales ◽  
Hitos Galán ◽  
Jose Manuel Perlado ◽  
Joaquín Cobos
Keyword(s):  
Spectroscopic Study ◽  
Extraction System ◽  
Acetohydroxamic Acid ◽  
Lanthanide Separation

Different implications of AHA hydrolysis affecting the extraction systems for actinide and lanthanide separation.

Photo-swing extraction system for lanthanide separation by a thermosensitive polymer gel combined with carbon nanotubes

2012 ◽  
Vol 72 (2) ◽  
pp. 142-147 ◽  
Author(s):  
Syouhei Nishihama ◽  
Kayo Ohsawa ◽  
Yasushi Yamada ◽  
Kazuharu Yoshizuka ◽  
Tsuyohiko Fujigaya ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Extraction System ◽  
Polymer Gel ◽  
Thermosensitive Polymer ◽  
Lanthanide Separation

scholarly journals Countercurrent Actinide Lanthanide Separation Process (ALSEP) Demonstration Test with a Simulated PUREX Raffinate in Centrifugal Contactors on the Laboratory Scale

2020 ◽  
Vol 10 (20) ◽  
pp. 7217
Author(s):  
Andreas Wilden ◽  
Fabian Kreft ◽  
Dimitri Schneider ◽  
Zaina Paparigas ◽  
Giuseppe Modolo ◽  
...  
Keyword(s):  
Separation Process ◽  
Acetohydroxamic Acid ◽  
Distribution Data ◽  
Heavier Lanthanides ◽  
Trivalent Actinides ◽  
Lighter Lanthanides ◽  
Lanthanide Separation ◽  
Centrifugal Contactor ◽  
Stage 1 ◽  
Centrifugal Contactors

An Actinide Lanthanide Separation Process (ALSEP) for the separation of trivalent actinides (An(III)) from simulated raffinate solution was successfully demonstrated using a 32-stage 1 cm annular centrifugal contactor setup. The ALSEP solvent was composed of a mixture of 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (HEH[EHP]) and N,N,N′,N′-tetra-(2-ethylhexyl)-diglycolamide (T2EHDGA) in n-dodecane. Flowsheet calculations and evaluation of the results were done using the Argonne’s Model for Universal Solvent Extraction (AMUSE) code using single-stage distribution data. The co-extraction of Zr(IV) and Pd(II) was prevented using CDTA (trans-1,2-diaminocyclohexane-N,N,N′,N′-tetraacetic acid) as a masking agent in the feed. For the scrubbing of co-extracted Mo; citrate-buffered acetohydroxamic acid was used. The separation of An(III) from the trivalent lanthanides (Ln(III)) was achieved using citrate-buffered diethylene-triamine-N,N,N′,N″,N″-pentaacetic acid (DTPA), and Ln(III) were efficiently back extracted using N,N,N′,N′-tetraethyl-diglycolamide (TEDGA). A clean An(III) product was obtained with a recovery of 95% americium and curium. The Ln(III) were efficiently stripped; but the Ln(III) product contained 5% of the co-stripped An(III). The carryover of Am and Cm into the Ln(III) product is attributed to too few actinide stripping stages, which was constrained by the number of centrifugal contactors available. Improved separation would be achieved by increasing the number of An strip stages. The heavier lanthanides (Pr, Nd, Sm, Eu, and Gd) and yttrium were mainly routed to the Ln product, whereas the lighter lanthanides (La and Ce) were mostly routed to the raffinate.

Some Results of the Spectroscopic Study of Four Close Binary Systems of Early Spectral Types

1965 ◽  
Vol 5 ◽  
pp. 120-130
Author(s):  
T. S. Galkina
Keyword(s):  
Spectroscopic Study ◽  
Spectral Type ◽  
Spectroscopic Investigation ◽  
Binary Systems ◽  
Quantitative Information ◽  
Close Binary ◽  
Physical Parameters ◽  
Absorption And Emission ◽  
Close Binary Systems ◽  
Quantitative Estimates

It is necessary to have quantitative estimates of the intensity of lines (both absorption and emission) to obtain the physical parameters of the atmosphere of components.Some years ago at the Crimean observatory we began the spectroscopic investigation of close binary systems of the early spectral type with components WR, Of, O, B to try and obtain more quantitative information from the study of the spectra of the components.

A spectroscopic study of soil fulvic acid composition after six-year applications of urban waste compost

Agronomie ◽  
2003 ◽  
Vol 23 (8) ◽  
pp. 719-724 ◽  
Author(s):  
Giovanni Gigliotti ◽  
Alceo Macchioni ◽  
Cristiano Zuccaccia ◽  
Pier Lodovico Giusquiani ◽  
Daniela Businelli
Keyword(s):  
Spectroscopic Study ◽  
Fulvic Acid ◽  
Acid Composition ◽  
Urban Waste

A Spectroscopic Study of the Environments of Gravitational Lens Galaxies

2006 ◽  
Vol 20 ◽  
pp. 289-290
Author(s):  
I. Momcheva ◽  
K. Williams ◽  
C. Keeton ◽  
A. Zabludoff
Keyword(s):  
Spectroscopic Study ◽  
Gravitational Lens ◽  
Lens Galaxies
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