Continuous Mutual Separation of Lanthanides by a Liquid-liquid Countercurrent Centrifugal Extractor with Taylor Vortices

Nakase, Masahiko; Tanaka, Mikiya; Takeshita, Kenji

doi:10.1016/j.egypro.2014.11.860

Cited by 10 publications

(8 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several researchers have reported on the slow extraction rate for Fe(III), 56,57 and on separation of yttrium(III), which has similar properties to Sc(III), from Fe(III) based on extraction kinetics. 58 Kinetic PIM-based separation of UO 2 2+ from Fe(III) has also been reported. 43 These results suggest the possibility of kinetic separation of Sc(III) from Fe(III) using a PIM containing D2EHAF.…”

Section: Extraction Equilibrium Of Sc(iii)mentioning

confidence: 95%

Separation and Recovery of Scandium from Sulfate Media by Solvent Extraction and Polymer Inclusion Membranes with Amic Acid Extractants

et al. 2019

View full text Add to dashboard Cite

We report on the separation and recovery of scandium(III) from sulfate solutions using solvent extraction and a membrane transport system utilizing newly synthesized amic acid extractants. Scandium(III) was quantitatively extracted with 50 mmol dm–3N-[N,N-di(2-ethylhexyl)aminocarbonylmethyl]glycine (D2EHAG) or N-[N,N-di(2-ethylhexyl)aminocarbonylmethyl]phenylalanine (D2EHAF) in n-dodecane at pH 2 and easily stripped using a 0.5 mol dm–3 sulfuric acid solution. The extraction mechanisms of scandium(III) extraction with D2EHAG and D2EHAF were examined, and it was established that scandium(III) formed a 1:3 complex with both extractants (HR), that is, Sc(SO4)2–aq + 1.5(HR)2org ⇄ Sc(SO4)R(HR)2org + H+aq + SO42–aq. The equilibrium constants of extraction were evaluated to be 4.87 and 9.99 (mol dm–3)0.5 for D2EHAG and D2EHAF, respectively. D2EHAG and D2EHAF preferentially extracted scandium(III) with a high selectivity compared to common transition metal ions under high acidic conditions (0 < pH ≤ 3). In addition, scandium(III) was quantitatively transported from a feed solution into a 0.5 mol dm–3 sulfuric acid receiving solution through a polymer inclusion membrane (PIM) containing D2EHAF as a carrier. Scandium(III) was completely separated thermodynamically from nickel(II), aluminum(III), cobalt(II), manganese(II), chromium(III), calcium(II), and magnesium(II), and partially separated from iron(III) kinetically using a PIM containing D2EHAF as a carrier. The initial flux value for scandium(III) (J0,Sc = 1.9 × 10–7 mol m–2 s–1) was two times higher than that of iron(III) (J0,Fe = 9.3 × 10–8 mol m–2 s–1).

show abstract

Section: Extraction Equilibrium Of Sc(iii)mentioning

confidence: 95%

Separation and Recovery of Scandium from Sulfate Media by Solvent Extraction and Polymer Inclusion Membranes with Amic Acid Extractants

et al. 2019

View full text Add to dashboard Cite

show abstract

“…[3][4][5] This kinetic rather than thermodynamic process control has been studied for several metal separations: e.g. Cu(II)/Fe(III) using Kelex-100, [6] Ni(II)/Co(III) using a phosphate extractant, [7] Ni(II)/Co(II) using a synergic SX system comprised of LIX 63 and Versatic Acid 10, [8] In(III)/Fe(III) with D2EHPA, [9,10] rare-earth elements (REE) using diethylenetriaminepentaacetic acid (DTPA) as complexing agent in the aqueous phase and Cyanex 272, D2EHPA or Aliquat 336 nitrate extractants, [11][12][13][14] REE/Fe(III) with Cyanex 923 or D2EHPA, [15][16][17] and platinum-group metals through the use of anions such as SCNor neutral ligands (often sulphur-containing). [4] A suitable phase contactor for non-equilibrium SX methods should enable thorough mixing, rapid phase separation, low solvent volume, short contact times and a narrow residence time distribution (RTD).…”

Section: Introductionmentioning

confidence: 99%

“…[18,19] Centrifugal contactors have been used in a number of studies as they allow for short contact times, while providing good mixing and rapid phase separation. [10,[15][16][17]20] A technology that has been gaining interest in recent years, mainly in the field of process intensification, is that of milli-or microfluidic devices (millimeter or micrometer sized reaction channels, respectively). The use of small-scale flow contactors provides several advantages for two-phase liquid-liquid systems, such as increased mass and heat transfer rates, large specific interfacial areas, reduced energy consumption and small solvent volume.…”

Section: Introductionmentioning

confidence: 99%

Non-equilibrium solvent extraction in milliflow reactors: Precious and base metal separations with undiluted ionic liquids

Vereycken

Stee

Riaño

et al. 2021

Separation and Purification Technology

View full text Add to dashboard Cite

“…It has excellent mass transfer efficiency, and can be applied for separation of two liquids with a small density difference . Due to these beneficial properties, the centrifugal contactor extractors are suitable for continuous separation of many mixtures using liquid–liquid extraction . Recently, we have used the centrifugal contactor extractors to separate enantiomers and developed a model to investigate the influence of process parameters on extraction efficiency for modeling and optimization of the separation process .…”

Section: Introductionmentioning

confidence: 99%

Continuous and selective separation of EGCG from tea polyphenols by fractional extraction: Experiment and simulation

et al. 2018

View full text Add to dashboard Cite

A new and efficient method was explored to continuously separate (−)-epigallocatechin-3-gallate (EGCG) from tea polyphenols (TPs) by fractional extraction in centrifugal contactor separators (CCSs). The effects of different organic solvents on distribution behavior of monomers of TPs were studied, and two green extraction systems were established without reactive extractant. Based on phase equilibrium and the law of conservation of mass, a fractional extraction model was developed to investigate the influence of the process parameters such as phase ratio and the number of stages on extraction efficiency. By simulation and optimization, optimal parameters can be obtained for the separation of EGCG. EGCG can be separated by batch and continuous separation. Excellent results can be achieved by the two methods with high purity, high yield, and large output. Compared to the batch method, the continuous separation is more suitable for production in an industrial scale due to low-cost and continuous separation.

show abstract

Continuous Mutual Separation of Lanthanides by a Liquid-liquid Countercurrent Centrifugal Extractor with Taylor Vortices

Cited by 10 publications

References 16 publications

Separation and Recovery of Scandium from Sulfate Media by Solvent Extraction and Polymer Inclusion Membranes with Amic Acid Extractants

Separation and Recovery of Scandium from Sulfate Media by Solvent Extraction and Polymer Inclusion Membranes with Amic Acid Extractants

Non-equilibrium solvent extraction in milliflow reactors: Precious and base metal separations with undiluted ionic liquids

Continuous and selective separation of EGCG from tea polyphenols by fractional extraction: Experiment and simulation

Contact Info

Product

Resources

About