Tetradentate amide extraction agents for trivalent lanthanides
Doctoral thesis, 2018
Solvent extraction is the dominant method for separation of lanthanides on commercial scale. It can also be used in hydrometallurgical recovery of lanthanides from waste streams. One disadvantage of current extraction processes is the need to use a large number of separation stages and, accordingly, large amount of chemicals. The extractants with the enhanced affinity for lanthanides could remedy this problem.
In this work novel tetradentate amide extractants, designed and synthesized for extraction of lanthanides, are reported. The distribution ratios of lanthanides were found to be higher in the reactions with these amides than with the bidentate malonamides. This is due to a difference in the entropic effects, associated with the extraction of the metals by the malonamides and the new reagents. Solvent extraction, X-ray crystallography and mass spectroscopy have been used to investigate the interactions of f-block elements with the new extractants.
electrospray ionization – mass spectrometry
single-crystal X-ray diffraction
Mikhail S Tyumentsev
Chalmers, Chemistry and Chemical Engineering, Energy and Material
The solvent extraction of rare earth elements from nitrate media with novel polyamides containing malonamide groups
Hydrometallurgy,; Vol. 164(2016)p. 24-30
Coordination of Trivalent Lanthanides with Bismalonamide Ligands: Implications for Liquid-Liquid Extraction
European Journal of Inorganic Chemistry,; Vol. 2017(2017)p. 4285-4298
Crystal structure and identification of resonance forms of diethyl 2-(3-oxoiso-1,3-dihydrobenzo-furan-1-ylidene)malonate
Acta Crystallographica Section E: Crystallographic Communications,; Vol. 73(2017)p. 1576-1579
Tyumentsev, M.S., Foreman, M.R.St.J., Steenari, B.-M., Ekberg, C. Temperature effect on the distribution of lanthanide(III) ions in the perchlorate-malonamide-methyl isobutyl ketone systems.
Tyumentsev, M.S., Matyskin, A.V., Foreman, M.R.St.J., Steenari, B.-M., Ekberg, C. Extraction of f-block elements with the bismalonamides.
Solvent extraction is the dominant method for separation of lanthanides on commercial scale. It can also be used in hydrometallurgical recovery of lanthanides from waste streams. One disadvantage of current extraction processes is the need to use great number of separation stages and, accordingly, large amount of chemicals. The aim of this thesis was to make new ligands with the enhanced affinity for lanthanides to remedy this problem.
Chemical Process Engineering
Chalmers Infrastructure for Mass spectrometry
Areas of Advance
Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 4508
ED-salen, Edit-huset, Hörsalsvägen 11, Chalmers
Opponent: Prof. Helen Aspinall, University of Liverpool, United Kingdom