Reactive liquid‐liquid test system Zn/Di (2‐ethyl hexyl) phosphoric acid/<i>n</i>‐Dodecane. Equilibrium and kinetics

Wachter, Bruno; Bart, Hans‐Jörg; Moosbrugger, Thomas; Marr, Rolf

doi:10.1002/ceat.270160610

Cited by 19 publications

(6 citation statements)

References 8 publications

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“…This is manifested by numerous publications from different research groups on the extraction of divalent cations into D2EHPA [4][5][6][7][8][9][10]. Reviewing these publications, two aspects are striking:…”

Section: Introductionmentioning

confidence: 98%

Mass Transfer Kinetics of Reactive Multi-Cation Co-Extraction Into Bis(2-Ethylhexyl) Phosphoric Acid

Geist¹,

Pluciński

Nitsch

2000

Solvent Extraction and Ion Exchange

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The kinetics of mass transfer for the chemical extraction of various metal cations with bis(2-ethylhexyl) phosphoric acid (D2EHPA) has been studied in a stirred cell. With all cations investigated (Cd z +, Cu z +, Ni z +, Pb z +, Zn z +) , mass transfer is found to be limited by diffusion as indicated by a linear increase of initial extraction rate with stining speed. Mass transfer coefficients of individual species are determined at experimental conditions that maintain mass transfer resistance in the donor phase. With known individual mass transfer coefficients and measured equilibrium data (stoichiometric coefficients and equilibrium constants), concentration courses in the stirred cell can be calculated for multi-cation co-extraction. Experimental and calculated results show good agreement, confirming the basic assumption that the chemical reaction is located at the liquid/liquid interface. 493

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Section: Introductionmentioning

confidence: 98%

Mass Transfer Kinetics of Reactive Multi-Cation Co-Extraction Into Bis(2-Ethylhexyl) Phosphoric Acid

Geist¹,

Pluciński

Nitsch

2000

Solvent Extraction and Ion Exchange

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“…The chemistry of the Zn/D2EHPA system is well known [14,15]. The ion exchanger D2EHPA is a monomer, RH, in aromatic and a dimer, R 2 H 2 , in aliphatic diluents [16].…”

Section: Reactive Equilibriamentioning

confidence: 99%

Reactive Extraction In Stirred Columns – A Review

Bart¹

2003

Chem Eng & Technol

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The use of liquid ion exchangers enables one to perform selective separations with reactive extraction of species such as metal ions or acids. For the simulation of countercurrent column performance, three major outstanding issues have to be tackled: The first step is in a description of reactive equilibria, based on Gibbs excess modeling, taking into account complex formation involving aqueous electrolytes and organic species. In addition to physical extraction, the mass transfer co-efficient must be determined by taking into account diffusional and/or chemical reaction resistances. Finally, the column hydrodynamics have to be considered, where the state of the art design is to consider the deviation from plug flow with one parameter (e.g. the axial dispersion co-efficient). The development of droplet population methods, and the helpful information from CFD-calculations for the improvement of the physical understanding of complex flows, will be discussed. The use of lab-scale equipment to estimate all necessary design parameters involving a minimum of matter, is also presented.

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“…Das Gleichgewicht der Extraktion von Zink mit D2EHPA wurde bereits in mehreren Arbeiten rezensiert [14,15], wobei prinzipiell Zink im Austausch gegen zwei Protonen in einen Komplex gebunden wird. Der Ionenaustauscher D2EHPA liegt dabei bekanntlich in aromatischen Lösemitteln als Monomer, RH, bzw.…”

Section: Reaktive Phasengleichgewichteunclassified

Reaktivextraktion – Ein Statusbericht zur Simulation gerührter Kolonnen

Bart¹

2002

Chemie Ingenieur Technik

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Die reaktive Flüssig/Flüssig-Extraktion hat eine weit verbreitete technologische Anwendung in der chemischen und pharmazeutischen Industrie (Zwischenprodukte, organische Säuren, Vitamine, Penicillin etc.) oder in hydrometallurgischen bzw. umwelttechnischen Applikationen (Schwermetalle, anorganische Säuren etc.). Die historischen Wurzeln liegen dabei in der Uranaufarbeitung und mit dem Durchbruch in den sechziger Jahren in der primären Kupfergewinnung durch LIX (Liquid Ion Exchanger)-Chemikalien, einem Bereich, der auch heute noch eine dominierende Stellung inne hat. Die entsprechenden Prozesse bzw. Übersichten zum Chemismus der Reaktivextraktion sind in der Literatur [1 ± 6] dokumentiert, wobei apparatetechnisch die Umsetzung in den meisten Fällen in Mischer-Abscheider-Anlagen erfolgt. Diese haben den Vorteil, dass man die Pha-R e a k t i v e x t r a k t i o n 229

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Reactive liquid‐liquid test system Zn/Di (2‐ethyl hexyl) phosphoric acid/n‐Dodecane. Equilibrium and kinetics

Cited by 19 publications

References 8 publications

Mass Transfer Kinetics of Reactive Multi-Cation Co-Extraction Into Bis(2-Ethylhexyl) Phosphoric Acid

Mass Transfer Kinetics of Reactive Multi-Cation Co-Extraction Into Bis(2-Ethylhexyl) Phosphoric Acid

Reactive Extraction In Stirred Columns – A Review

Reaktivextraktion – Ein Statusbericht zur Simulation gerührter Kolonnen

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