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 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 The effect of the morpholinium ionic liquid anion on the catalytic activity of Rh (or Pt) complex–ionic liquid systems in hydrosilylation processes

RSC Advances ◽  
2018 ◽  
Vol 8 (47) ◽  
pp. 26922-26927 ◽  
Author(s):  
Magdalena Jankowska-Wajda ◽  
Izabela Dąbek ◽  
Ryszard Fiedorow ◽  
Hieronim Maciejewski
Keyword(s):  
Ionic Liquid ◽  
Catalytic Activity ◽  
Ionic Liquids ◽  
Platinum Complexes ◽  
Pt Complex ◽  
Liquid Systems

Rhodium and platinum complexes were immobilized in morpholinium ionic liquids, the effect of which on the catalytic activity was determined.

scholarly journals Highly efficient separation of rare earths from nickel and cobalt by solvent extraction with the ionic liquid trihexyl(tetradecyl)phosphonium nitrate: a process relevant to the recycling of rare earths from permanent magnets and nickel metal hydride batteries

2014 ◽  
Vol 16 (3) ◽  
pp. 1594-1606 ◽  
Author(s):  
Tom Vander Hoogerstraete ◽  
Koen Binnemans
Keyword(s):  
Ionic Liquid ◽  
Solvent Extraction ◽  
Rare Earths ◽  
Metal Hydride ◽  
Permanent Magnets ◽  
Nickel Metal ◽  
Nickel Metal Hydride ◽  
Efficient Separation ◽  
Highly Efficient

The undiluted ionic liquid trihexyl(tetradecyl)phosphonium nitrate was used for cobalt–samarium and nickel–lanthanum separations by solvent extraction.

Solvent extraction of rare earths using a bifunctional ionic liquid. Part 1: Interaction with acidic solutions

2017 ◽  
Vol 169 ◽  
pp. 306-313 ◽  
Author(s):  
James E. Quinn ◽  
Karin H. Soldenhoff ◽  
Geoffrey W. Stevens
Keyword(s):  
Ionic Liquid ◽  
Solvent Extraction ◽  
Rare Earths ◽  
Acidic Solutions ◽  
Liquid Part

scholarly journals Solubility of Mixtures Containing Soybean Oil, Ionic Liquid and Methanol

2016 ◽  
Vol 10 (1) ◽  
pp. 41-49
Author(s):  
Marina S. Manic ◽  
Vesna Najdanovic-Visak
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Soybean Oil ◽  
Cloud Point ◽  
Mutual Solubility ◽  
Titration Method ◽  
Temperature Range ◽  
Lower Solubility ◽  
Liquid Systems

This paper presents data on mutual solubility of the binary (soybean oil + ionic liquid) and ternary (soybean oil + methanol + ionic liquid) systems, where ionic liquid stands for 1-butyl-3-methylimidazolium thiocyanate [C4MIM][SCN] or 1-butyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide [C4MIM][NTf2] or 1-butyl-3-methylimidazolium dicyanamide [C4MIM][DCA] or 1-butyl-3-methylimidazolium hexafluorophosphate [C4MIM][PF6] or 1-butyl-3-methyl imida zolium hydrogensulfate [C4MIM] [HSO4] or 1-decyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [C10MIM][NTf2] or methyltrioctylammonium bis(trifluoromethylsulfonyl)imide [ALIQUAT][NTf2] or methyltrioctylammonium chloride [ALIQUAT][Cl]. Solubilities were determined by the cloud point titration method in the temperature range of 298 K to 343 K. Obtained results suggest that imidazolium based ionic liquids exhibit lower solubility in soybean oil than ionic liquids with the aliquat cation. Thus, aliquat based ionic liquids are good candidate to be used as co-solvents for biphasic (methanol + soybean oil) mixture.

scholarly journals Thermo-physical properties and activity coefficients at infinite dilution for ionic liquid systems at several temperatures

2017 ◽  
Author(s):  
◽  
Sangeeta Singh
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Thermodynamic Properties ◽  
Infinite Dilution ◽  
Binary Systems ◽  
Isentropic Compressibility ◽  
Liquid Systems ◽  
Different Temperatures ◽  
Kister Equation ◽  
Deviation In Isentropic Compressibility

The thermodynamic properties of mixtures involving ionic liquids (ILs) with organic acid (acetic acid or propanoic acid) or acetonitrile at different temperatures were determined. The ILs used were imidazolium-based: 1-ethyl-3-methylimidazolium ethyl sulphate [EMIM]+[EtSO4]-, 1-butyl- 3-methylimidazolium thiocyanate [BMIM]+[SCN]- and 1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide ([BMIM]+[Tf2N]-. The ternary excess molar volume (V E ), isentropic compressibility (ks) and deviation in isentropic compressibility ( ks123 ) were determined for four ternary liquid mixtures of {[EMIM]+[EtSO4]- or [BMIM]+[SCN]− + acetic or propionic acid + acetonitrile} at different temperatures (293.15, 298.15, 303.15, 308.15 and 313.15) K and at a pressure of 0.1 MPa with aid of the experimental density (ρ), speed of sound (u) data. The calculated data were correlated by using the Cibulka equation with the help of Redlich–Kister parameters obtained from fitting the Redlich–Kister equation for the corresponding binary systems. Furthermore, the density and speed of sound were also measured for eight corresponding binary systems at the same experimental conditions. The binary excess molar volume, isentropic compressibility and deviation in isentropic compressibility were also calculated for measured systems and fitted to the Redlich–Kister equation to obtain the Redlich–Kister parameters as well as to check the accuracy of measured data which were used to correlated experimental data using Cibulka equation. These results were discussed, in terms of how the sign and magnitude of thermodynamic functions were influenced by the addition of a third component to liquid systems. Also, the possible molecular and pair-wise interactions between component molecules and the effect of temperature on the thermophysical and thermodynamic properties were predicted. In addition, the work focussed on application of ([BMIM]+[Tf2N]-) ionic liquid for the separations of (alkane/aromatic), (alkane/alk-1-ene), (cycloalkane/aromatic) and (water/alkan-1-ol) using gas- liquid chromatography (GLC) technique. The activity coefficients at infinite dilution, , for 31 organic solutes (alkanes, cycloalkanes, alkenes, alkynes, aromatics, alkanol and ketones) and water in ionic liquid were measured at temperatures of (323.15, 333.15, 343.15, 353.15 and 363.15) K. Stationary phase loadings of (42.83 and 68.66) % by mass were used to ensure repeatability of E , measurements. Partial molar excess enthalpies at infinite dilution, H1 , were also determined. The selectivities, S , and capacities, k , were determined for the above separations. The separating ij j ability of the investigated ionic liquid was compared with previously investigated ionic liquids and industrial solvents such as sulfolane, n-methyl-2-pyrrolidine (NMP) and n-formylmorpholine (NFM). The results obtained suggested that in general, the [BMIM]+[Tf2N]− had outperformed the conventional solvents such as sulfolane, NMP and NFM in terms of selectivity, while the [BMIM][Tf2N] had in general, performed better overall when the performance index was used for comparison.

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 Carbon dioxide uptake from natural gas by binary ionic liquid–water mixtures

2015 ◽  
Vol 17 (8) ◽  
pp. 4340-4354 ◽  
Author(s):  
Kris Anderson ◽  
Martin P. Atkins ◽  
Julien Estager ◽  
Yongcheun Kuah ◽  
Shieling Ng ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Natural Gas ◽  
Liquid Water ◽  
Carbon Dioxide Uptake ◽  
Liquid Systems

Carbon dioxide solubility in a set of carboxylate ionic liquids formulated with stoicheiometric amounts of water is found to be significantly higher than for other ionic liquid systems previously reported.

Sign in / Sign up

Export Citation Format

Share Document