scholarly journals Separation of rare earths and nickel by solvent extraction with two mutually immiscible ionic liquids

RSC Advances ◽  
2014 ◽  
Vol 4 (11) ◽  
pp. 5753 ◽  
Author(s):  
Alok Rout ◽  
Sil Wellens ◽  
Koen Binnemans
Keyword(s):  
Ionic Liquids ◽  
Solvent Extraction ◽  
Rare Earths

scholarly journals Liquid-liquid solvent extraction of rare earths: a crystallographic analysis.

2014 ◽  
Vol 70 (a1) ◽  
pp. C1006-C1006
Author(s):  
Jeroen Jacobs ◽  
Koen Binnemans ◽  
Luc Van Meervelt
Keyword(s):  
Crystal Structure ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Rare Earth ◽  
Solvent Extraction ◽  
Aqueous Phase ◽  
Rare Earths ◽  
Structural Information ◽  
Side Chain ◽  
Anionic Complex

Liquid-liquid solvent extraction has become the primary research topic for separating mixtures of rare-earths. [1] Current research on this topic focuses on extraction processes involving ionic liquids as basic extracting agents. In the aqueous phase, the rare-earth is coordinated by the anionic entities of the ionic liquid, forming an anionic complex. The large organic cation of the ionic liquid neutralizes the complex (ion-pair complex) and migrates the entity to an organic phase. The choice of these agents is solely based on the calculation of thermodynamical extraction parameters, whilst structural information about these compounds is rare or even non-existent. Our research focuses on obtaining structural information via crystallography on the above-mentioned molecules and relating the interactions between anion and cation to the stability of the complexes. A difference in stability between the anionic complex and cation can give a different extractability. Different rare-earth chloride salts were dissolved in an aqueous phase, containing ionic liquids with β-diketonate anions and 1-alkyl-3-methylimidazolium cations. After the extraction, crystals of the formed compounds are grown from the organic phase and measured. Current results show us that an intermolecular non-classical C-H ... O hydrogen bond is persistent across the different molecules, whilst small interactions between the cation side chain and halogens on the β-diketonate add extra stability to the crystal structure. Structures formed with 2-thenolytrifluoroactylacetonate anions have no intention to form side chain interactions, leaving the alkyl chain of the 1-alkyl-3-methylimidazolium in a void, whilst structures formed with hexafluoroacetylactonate have strong side chain interactions, which leads to a better packing. The different solubility of both compounds can be related to the different interactions and stability in the crystal structure.

scholarly journals Split-anion solvent extraction of light rare earths from concentrated chloride aqueous solutions to nitrate organic ionic liquids

RSC Advances ◽  
2018 ◽  
Vol 8 (60) ◽  
pp. 34754-34763 ◽  
Author(s):  
Mercedes Regadío ◽  
Tom Vander Hoogerstraete ◽  
Dipanjan Banerjee ◽  
Koen Binnemans
Keyword(s):  
Ionic Liquids ◽  
Solvent Extraction ◽  
Aqueous Solutions ◽  
Rare Earths ◽  
Feed Solution

Rare earths are extracted efficiently by nitrate ionic liquids from a chloride feed solution.

scholarly journals Solvent extraction of rare earths elements from nitrate media in DMDOHEMA/ionic liquid systems: performance and mechanism studies

RSC Advances ◽  
2021 ◽  
Vol 11 (50) ◽  
pp. 31197-31207
Author(s):  
Cesar L. Usma ◽  
S. Dourdain ◽  
G. Arrachart ◽  
S. Pellet-Rostaing
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Solvent Extraction ◽  
Rare Earths ◽  
Liquid Systems ◽  
Extraction Mechanisms ◽  
Performance And Mechanism

Extraction of La(iii), Eu(iii) and Fe(iii) was compared in n-dodecane and in two ionic liquids (ILs) [EBPip+] [NTf2−] and [EOPip+] [NTf2−]. Extraction mechanisms have been investigated as a function of pH.

scholarly journals Correction: Split-anion solvent extraction of light rare earths from concentrated chloride aqueous solutions to nitrate organic ionic liquids

RSC Advances ◽  
2020 ◽  
Vol 10 (72) ◽  
pp. 44087-44087
Author(s):  
Mercedes Regadío ◽  
Tom Vander Hoogerstraete ◽  
Dipanjan Banerjee ◽  
Koen Binnemans
Keyword(s):  
Ionic Liquids ◽  
Solvent Extraction ◽  
Aqueous Solutions ◽  
Rare Earths

Correction for ‘Split-anion solvent extraction of light rare earths from concentrated chloride aqueous solutions to nitrate organic ionic liquids’ by Mercedes Regadío et al., RSC Adv., 2018, 8, 34754–34763, DOI: 10.1039/c8ra06055j.

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