OPTIONS FOR THE SEPARATION OF COPPER(n) AND ZINC(II) FROM CHLORIDE SOLUTIONS BY KELEX 100<sup>®</sup>

Kyuchoukov, George; Zhivkova, S.

doi:10.1080/07366290008934682

Cited by 11 publications

(4 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The total concentration of zinc(II) ions in the chloride aqueous phase is equal to false[ Zn + 2 false] normalT , aq = false[ Zn + 2 false] aq + false[ ZnCl + false] aq + false[ ZnCl 2 false] aq + false[ ZnCl 3 − false] aq + false[ ZnCl 4 − 2 false] aq where false[ ZnCl i 2 − italici false] aq = β i [ Z n ( + 2 ) ] false[ normalC normall − false] i and β i is the overall stability constant of i th zinc(II) chlorocomplexes. − …”

Section: Resultsmentioning

confidence: 99%

Quaternary Pyridinium Ketoximes as Zinc Extractants from Chloride Solutions

et al. 2013

View full text Add to dashboard Cite

The goal of this work was to study the extraction of zinc(II) ions from chloride solutions with the hydrophobic quaternary 3-pyridinium ketoximes. The influence of pH, contact time, concentration of chloride ions and extractant, as well as the effect of ligand structure on the zinc(II) extraction were investigated. The studies showed that at 4 M Cl − , regardless of the acidity of the aqueous chloride solutions and type of anions attached to pyridinium ring, the zinc(II) extraction increased with increasing length of the alkyl chain. Furthermore, the extraction from a multielemental solution is selective and the created complex can be decomposed after being shaken with the aqueous solutions of sodium sulfate or sodium hydroxide. It was also indicated that the zinc(II) extraction by the hydrophobic quaternary 3-pyridinium ketoximes proceeded via an ion-exchange mechanism, and the molar ratio of zinc to ligand to chloride in the complex molecule was 1:1:2, 1:1:3, and 1:2:2.

show abstract

Section: Resultsmentioning

confidence: 99%

Quaternary Pyridinium Ketoximes as Zinc Extractants from Chloride Solutions

et al. 2013

View full text Add to dashboard Cite

show abstract

“…The use of one bifunctional reagent instead of the mixture of two reagents was also proposed. − Alkyl derivatives of 8-hydroxyquinoline (HL) (KELEX 100, LIX 26) can form chelates with metal ions (ML 2 ), especially copper, and after protonation the ion pairs with metal chloro complexes (MCl 4 (H 2 L) 2 ).…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, some protonation of the extractant occurs during the stripping The reagent must be then transformed into the hydrochloride form by washing with chloride solution The theoretic aspects of copper(II) and zinc(II) extraction were described in previous papers. − …”

Section: Introductionmentioning

confidence: 99%

Separation of Copper(Ii) and Zinc(Ii) from Chloride Solutions with Alkyl-8-hydroxyquinoline in Various Stages of Extraction: Stripping Process

Kyuchoukov

Zhivkova

Borowiak‐Resterna

et al. 2000

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

Separation of zinc(II) from copper(II) from chloride solutions is studied using alkyl-8-hydroxyquinoline (KELEX 100). The separation can be achieved in the stage of extraction, scrubbing with water, or stripping with sulfuric acid. Appropriate conditions for such separation are given and discussed, with selective stripping being the most promising. In such a process, the extraction of both Zn(II) and Cu(II) can be carried out from solutions of high acidity and high concentration of chloride ions. An ammoniacal solution can be used for scrubbing chloride from the organic phase. Zinc(II) can then be selectively stripped from the organic phase with 0.25-0.8 M sulfuric acid at a 1:1 volume ratio. Nearly 3 M sulfuric acid is needed for the stripping of copper.

show abstract

“…The change of the system from chloride into sulfate in the extraction−stripping process was also considered. It can be achieved using mixed reagents: a basic reagent and a chelating reagent, − a solvating reagent and a chelating compound, , or a bifunctional extractant. − Kelex 100 and Lix 26, which contain 7-alkyl-8-hydroxyquinoline (HL) as the active substance, can be considered as such a bifunctional extractant . It can react as a basic reagent transferring metal chlorocomplexes into organic phase, e.g., in the form MCl 4 (H 2 L) 2 .…”

Section: Introductionmentioning

confidence: 99%

Modeling of Copper(II) and Zinc(II) Extraction from Chloride Media with KELEX 100

Bogacki

Zhivkova

Kyuchoukov

et al. 2000

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

The extraction of copper(II) and zinc(II) from acidic chloride solutions with protonated Kelex 100 (HL) was studied and the extraction isotherms were determined for systems containing individual metal ions and their mixtures. A chemical model was proposed and verified. It considers the coextraction of the following species: MCl 4 (H 2 L) 2 , MCl 4 (H 2 L) 2 ‚HCl, MCl 3 (H 2 L), ML 2 , and H 2 L‚HCl. Zinc(II) is extracted as the metal ion pairs, while copper(II) can be extracted as the metal ion pair and the chelate. The model can be used to predict the effect of experimental conditions on extraction and coextraction of the metal ions considered.

show abstract

OPTIONS FOR THE SEPARATION OF COPPER(n) AND ZINC(II) FROM CHLORIDE SOLUTIONS BY KELEX 100^®

Cited by 11 publications

References 11 publications

Quaternary Pyridinium Ketoximes as Zinc Extractants from Chloride Solutions

Quaternary Pyridinium Ketoximes as Zinc Extractants from Chloride Solutions

Separation of Copper(Ii) and Zinc(Ii) from Chloride Solutions with Alkyl-8-hydroxyquinoline in Various Stages of Extraction: Stripping Process

Modeling of Copper(II) and Zinc(II) Extraction from Chloride Media with KELEX 100

Contact Info

Product

Resources

About

OPTIONS FOR THE SEPARATION OF COPPER(n) AND ZINC(II) FROM CHLORIDE SOLUTIONS BY KELEX 100®

Cited by 11 publications

References 11 publications

Quaternary Pyridinium Ketoximes as Zinc Extractants from Chloride Solutions

Quaternary Pyridinium Ketoximes as Zinc Extractants from Chloride Solutions

Separation of Copper(Ii) and Zinc(Ii) from Chloride Solutions with Alkyl-8-hydroxyquinoline in Various Stages of Extraction: Stripping Process

Modeling of Copper(II) and Zinc(II) Extraction from Chloride Media with KELEX 100

Contact Info

Product

Resources

About

OPTIONS FOR THE SEPARATION OF COPPER(n) AND ZINC(II) FROM CHLORIDE SOLUTIONS BY KELEX 100^®