Separation of Cobalt and Nickel by Liquid Surfactant Membranes Containing a Synthesized Cationic Surfactant

Kakoi, Takahiko; Ura, Tsuyoshi; Kasaini, Henry; Goto, Masahiro; Nakashio, Fumiyuki

doi:10.1080/01496399808545247

Cited by 18 publications

(5 citation statements)

References 12 publications

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“…Extraction Equilibrium Formulations. The extraction equilibrium formulation for cobalt with LIX-84I or LIX-65N as the extractant, when diluted with n -heptane, has been investigated and expressed according to eq 1 Figure shows the effect of the equilibrium pH value on the distribution ratio for the n -dodecane diluent system.…”

Section: Resultsmentioning

confidence: 99%

“…The extraction equilibrium formulation for cobalt with LIX-84I or LIX-65N as the extractant, when diluted with n-heptane, has been investigated and expressed according to eq 1. 11 Figure 1 shows the effect of the equilibrium pH value on the distribution ratio for the n-dodecane diluent system. Linear relationships with slope of about 2 were obtained in the present systems as for the reported n-heptane system, thus indicating that only divalent cobalt takes part in the extraction.…”

Section: Extraction Equilibrium Formulationsmentioning

confidence: 99%

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Photoreductive Stripping of Cobalt Loaded on Hydroxyoxime Extractant in a Liquid−Liquid Extraction System

Nishihama

Sakaguchi

Hirai

et al. 2000

Ind. Eng. Chem. Res.

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The photoreductive stripping of cobalt from hydroxyoxime extractants was investigated, employing 2-hydroxy-5-nonylacetophenone oxime (LIX-84I) and 2-hydroxy-5-nonylbenzophenone oxime (LIX-65N) as extractants, n-dodecane as the diluent, and a halogen lamp as the light source. The stripping of cobalt is barely achieved by conventional stripping, in this extraction system, because of the oxidation of the cobalt-hydroxyoxime complex by electron attraction with the O 2 molecule. The stripping of cobalt is, however, substantially improved by photoirradiation using light of visible radiation wavelength. The organic solution obtained following photoirradiation can be reused for repeated extraction and photoreductive stripping processing.

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Section: Resultsmentioning

confidence: 99%

Section: Extraction Equilibrium Formulationsmentioning

confidence: 99%

Photoreductive Stripping of Cobalt Loaded on Hydroxyoxime Extractant in a Liquid−Liquid Extraction System

Nishihama

Sakaguchi

Hirai

et al. 2000

Ind. Eng. Chem. Res.

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“…Since LEMs were formulated by Li1 in the late 1960s, a considerable amount of work has been done on the LEM extraction of nickel 2–6. However, there is scant information in the published literature regarding membrane stability and swelling during application of the technique for the extraction of nickel.…”

Section: Introductionmentioning

confidence: 99%

Membrane stability and enrichment of nickel in the liquid emulsion membrane process

Kulkarni

Tiwari

Mahajani

2000

J. Chem. Technol. Biotechnol.

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The parameters affecting the stability of a liquid emulsion membrane (LEM) for enrichment of nickel were studied. The liquid membrane is made up of a carrier (di-2-ethylhexylphosphoric acid), organic diluent and an emulsifying agent (sorbitan monooleate). Swelling of the internal phase during extraction results in breakage of the emulsion. The role of pH is very important in the LEM process for extraction of nickel. A signi®cant decrease in swelling was observed by maintaining the pH of the feed phase constant during extraction. A lower osmotic pressure difference between the external and internal phase brings about lower changes in the swelling and membrane breakdown.

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“…In addition, conventional solvent extraction methods are considered less effective at low metal ion concentrations (Suren et al, 2012;Wannachod et al, 2015). Therefore, the solvent extraction method was developed into a liquid membrane-based technology using emulsion liquid membrane (ELM) (Kakoi et al, 1998;Kumbasar & Tutkun, 2006). This development was carried out because ELM resulted in high mass transfer and surface area, simultaneous extraction and stripping in one step, relatively low cost, energy consumption, and the ability to process various compounds relatively quickly (Binnal & Hiremath, 2012).…”

Section: Introductionmentioning

confidence: 99%

The Effect of Surfactants on Separation of Light Rare Earth Metals using Emulsion Liquid Membrane Method: Review

et al. 2022

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Rare earth metals (REM) are scarce elements and are only found in the form of complex compounds of phosphate and carbonate. REM consists of 17 elements classified into light REM, medium REM, and heavy REM. This article is focused on lightweight REM, which is widely applied in various industrial fields. Many REM applications are increasing the demand for high-purity and bulk REMs. However, REM has almost the same physical and chemical properties, making it difficult to separate. Therefore, the separation of REM is interesting to study with various methods, one of which is Emulsion Liquid Membrane (ELM). ELM is developing a solvent extraction method involving three phases: the external phase, the internal phase, and the membrane phase. The key to the success of ELM lies in the stability of the emulsion, which is very dependent on the type and concentration of surfactants, so in the ELM process, it is necessary to choose the right concentration and type of surfactant. Therefore, this article was made to know the effect of surfactants such as span-80, span-85, and T154 in separating light REM using the ELM method.

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Separation of Cobalt and Nickel by Liquid Surfactant Membranes Containing a Synthesized Cationic Surfactant

Cited by 18 publications

References 12 publications

Photoreductive Stripping of Cobalt Loaded on Hydroxyoxime Extractant in a Liquid−Liquid Extraction System

Photoreductive Stripping of Cobalt Loaded on Hydroxyoxime Extractant in a Liquid−Liquid Extraction System

Membrane stability and enrichment of nickel in the liquid emulsion membrane process

The Effect of Surfactants on Separation of Light Rare Earth Metals using Emulsion Liquid Membrane Method: Review

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