Tetradentate amide extraction agents for trivalent lanthanides
Doktorsavhandling, 2018

Lanthanides are valuable materials. They are used in catalysts, permanent magnets, batteries, optical devices, and in many other products. Lanthanides are mainly supplied by mining industry, which generates large volumes of waste due to relatively low concentrations of these elements in geological deposits. Recovery of lanthanides from end-of-life items could contribute to the supply of these elements and thus decrease waste generation from mining.

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.

malonamides

lanthanides

solvent extraction

entropic effect

electrospray ionization – mass spectrometry

single-crystal X-ray diffraction

ED-salen, Edit-huset, Hörsalsvägen 11, Chalmers
Opponent: Prof. Helen Aspinall, University of Liverpool, United Kingdom

Författare

Mikhail S Tyumentsev

Chalmers, Kemi och kemiteknik, Energi och material, Kärnkemi

Coordination of Trivalent Lanthanides with Bismalonamide Ligands: Implications for Liquid-Liquid Extraction

European Journal of Inorganic Chemistry,; (2017)p. 4285-4298

Artikel i vetenskaplig tidskrift

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-

Artikel i vetenskaplig tidskrift

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.

Lanthanides are valuable materials. They are used in catalysts, permanent magnets, batteries, optical devices, and in many other products. Lanthanides are mainly supplied by mining industry, which generates large volumes of waste due to relatively low concentrations of these elements in geological deposits. Recovery of lanthanides from end-of-life items could contribute to the supply of these elements and thus decrease waste generation from mining.

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.

Ämneskategorier

Analytisk kemi

Kemiska processer

Geokemi

Infrastruktur

Chalmers infrastruktur för masspektrometri

Styrkeområden

Energi

Fundament

Grundläggande vetenskaper

ISBN

978-91-7597-827-7

Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 4508

Utgivare

Chalmers tekniska högskola

ED-salen, Edit-huset, Hörsalsvägen 11, Chalmers

Opponent: Prof. Helen Aspinall, University of Liverpool, United Kingdom

Mer information

Senast uppdaterat

2018-11-07