Metal extraction to ionic liquids: the relationship between structure, mechanism and application

Janssen, Camiel H. C.; Macı́as-Ruvalcaba, Norma A.; Aguilar-Martı́nez, Martha; Kobrak, Mark N.

doi:10.1080/0144235x.2015.1088217

Cited by 86 publications

(70 citation statements)

References 140 publications

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“…Finally, we suggest that the water solubility in the imidazolium-based ILs, [C 4 As shown in Fig. 5 47 The increase of the water content in ILs contacted with aqueous DCl solutions is probably caused by the extraction of hydrated H[Tf 2 N] species as previously discussed for IL-based biphasic systems with aqueous H[Tf 2 N] solutions (Fig.…”

Section: Mutual Solubility Of Water and Il In The Presence Of H[tf 2 mentioning

confidence: 87%

Mutual solubility of water and hydrophobic ionic liquids in the presence of hydrochloric acid

et al. 2016

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Previous studies have shown that the presence of nitric acid, the principal solute in various hydrometallurgical processes, and perchloric acid in the aqueous phase is an important factor for increased aqueous solubility of hydrophobic ionic liquids. In this study, the effect of hydrochloric acid in the aqueous phase on the mutual solubility of water and hydrophobic 1,3-dialkylimidazolium-and N,Ndialkylpyrrolidinium bis(trifluoromethylsulfonyl)imide ionic liquids, [C n mim][Tf 2 N] (n ¼ 2, 4, 6, and 8) and [C 3 C 1 pyrr][Tf 2 N], is examined at room temperature and atmospheric pressure. Hydrochloric acid caused a considerable increase in the aqueous solubility of all the studied ionic liquids. The amount of water transferred into the organic phase increases with increasing hydrochloric acid concentration for short alkyl chain ILs, and the opposite trend was observed for long alkyl chain ILs. The effect of the N-H acid bis(trifluoromethylsulfonyl)imide, H[Tf 2 N], and the salts lithium bis(trifluoromethylsulfonyl)imide, Li[Tf 2 N], and 1-butyl-3-methylimidazolium chloride, [C 4 mim]Cl, dissolved in hydrochloric acid solutions on the mutual solubility of water and the [C 4 mim][Tf 2 N] ionic liquid were also investigated. The salting-out effect is observed and it was shown to be dependent on the nature of the salt, its concentration and the hydrochloric acid concentration in the aqueous phase. A mathematical model has been developed to describe the dependence of the ionic liquid cation and anion concentration on the common ion salt concentration in the aqueous hydrochloric acid phase. This model describes the basic character of ionic liquid dissolution in the aqueous phase and allows for estimation of solubility product values.

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Section: Mutual Solubility Of Water and Il In The Presence Of H[tf 2 mentioning

confidence: 87%

Mutual solubility of water and hydrophobic ionic liquids in the presence of hydrochloric acid

et al. 2016

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“…The mechanism of ion extraction to ILs can be quite complicated [50][51][52][53][54]. Charged metal complexes are generally soluble in ILs, and Cu 2+ may therefore move from the aqueous to the IL phase without coordinating anions.…”

Section: Mechanism Of Extractionmentioning

confidence: 99%

Copper extraction using protic ionic liquids: Evidence of the Hofmeister effect

Janssen

Macı́as-Ruvalcaba

Aguilar-Martı́nez

et al. 2016

Separation and Purification Technology

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“…[8][9][10][11][12][13][14][15][16][17][18][19] Among several approaches, ionic liquid chelate extraction using Brønsted acidic chelators as extraction reagents 20,21 is interesting because a change in the aqueousphase pH results in changing the extraction performance.…”

Section: Introductionmentioning

confidence: 99%

Distribution Equilibria of Amphoteric 8-Quinolinol between 1-Alkyl-3-methylimidazolium Bis(trifluoromethanesulfonyl)imide and Aqueous Phases and Their Effect on Ionic Liquid Chelate Extraction Behavior of Iron(III)

2017

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The distribution behavior of amphoteric 8-quinolinol (HQ) between ionic liquid (IL) phase and aqueous phase and ionic liquid chelate extraction behavior of iron(III) with HQ were investigated using four 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (CnmimTf2N, n = 2, 4, 6 and 8) ILs. Not only neutral HQ but also cationic H2Q + were distributed into the IL phase, and the latter distribution based on cation-exchange with Cnmim + was pronounced in the use of IL having a less-hydrophobic cation, such as C2mim + . In the IL chelate extraction of iron(III), the extractability increased with the increase in the hydrophobicity of IL as the extraction phase. Nevertheless, the determined equilibrium constants for the extraction as the neutral complex FeQ3 were similar to one another. The difference in the extractability among the ILs was due to the difference in the distribution of H2Q + into the extraction phase. In addition, the cationic coordinatively-unsaturated complex FeQ2+ was also extracted in use of less-hydrophobic C2mimTf2N.

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Metal extraction to ionic liquids: the relationship between structure, mechanism and application

Cited by 86 publications

References 140 publications

Mutual solubility of water and hydrophobic ionic liquids in the presence of hydrochloric acid

Mutual solubility of water and hydrophobic ionic liquids in the presence of hydrochloric acid

Copper extraction using protic ionic liquids: Evidence of the Hofmeister effect

Distribution Equilibria of Amphoteric 8-Quinolinol between 1-Alkyl-3-methylimidazolium Bis(trifluoromethanesulfonyl)imide and Aqueous Phases and Their Effect on Ionic Liquid Chelate Extraction Behavior of Iron(III)

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