Results 131 to 140 of about 535 (180)
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Kinetics of Mn(II) extraction by D2EHPA
Hydrometallurgy, 2003Abstract The kinetics of forward extraction of Mn(II) from 0.1 M SO42− medium by di-(2-ethyl hexyl) phosphoric acid (D2EHPA) solution in kerosene have been investigated by the Lewis (L.C.) and Hahn cell (H.C.) techniques. For kinetic data treatment, both pseudo-rate constant, ‘q’ or ‘rate/area’ and flux, ‘F’ methods have been applied.
R.K Biswas, M.G.K Mondal
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Extraction of macro- and microamounts of lanthanides by D2EHPA
Journal of Radioanalytical and Nuclear Chemistry Articles, 1990The effect of macroconcentration (Ma) lanthanide extraction on the microcomponent (Mi) extraction by D2EHPA was investigated. The investigation corroborated that the macrocomponent suppresses the microcomponent extraction. The extractability of Mi decreases with increasing Ma concentration and with increasing proton lanthanide number in ...
V. Jedináková +3 more
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The separation of manganese from cobalt by D2EHPA
Hydrometallurgy, 1984Abstract The separation of manganese from cobalt in sulphate solution by D2EHPA diluted with kerosene is reported. Manganese can be separated by controlling the aqueous and organic pH in the neighborhood of 4.2 and 2.0, respectively. A continuous separation process is proposed.
Ying-Chu Hoh +3 more
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On the kinetics of rare-earth extraction into D2EHPA
Chemical Engineering Science, 1999Abstract Extraction kinetics of rare-earth elements (La 3+ , Ce 3+ , Pr 3+ , Nd 3+ , Eu 3+ ) in nitric acid, thiocyanate and formate into D2EHPA (bis-2-ethylhexyl phosphoric acid ester, 0.05 kmol m -3 ) is studied in a stirred cell at pH=2.1. Extraction rate is found to be limited by diffusion.
Geist, A., Nitsch, W., Kim, J. I.
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Interfacial tension studies on the extraction of lanthanum by d2ehpa
Hydrometallurgy, 1986Abstract Values of interfacial tension can be useful in providing an insight into interfacial behaviour for immiscible liquids. Changes of interfacial tension during extraction for the system La(NO 3 ) 3 —D2EHPA—diluents are reported. The selected parameters which can affect the change of interfacial tension are aqueous pH and aromatic and aliphatic ...
Ying-Chu Hoh +2 more
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Synergistic extraction of nucleobases by the combination of calixarene and D2EHPA
Separation and Purification Technology, 2005A calix[6]arene carboxylic acid derivative incorporating tert-octyl groups at the upper rim was found to be soluble in an aliphatic organic solvent. The extraction behavior of various nucleobases was investigated with the calix[6]arene carboxylic acid derivative. In an isooctane system, neither calix[6]arene nor D2EHPA were very effective at nucleobase
Kojiro Shimojo, Masahiro Goto
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Facilitated SLM extraction of peptides with D2EHPA as a carrier
Desalination, 2004Abstract The extraction of short peptides through a supported liquid membrane containing di-2-(ethylhexyl)phosphoric acid (D2EHPA) as a carrier was investigated. The extraction was carried out from the aqueous donor phase with pH 3 to amore acidic acceptor phase.
Anna Drapała, Piotr Wieczorek
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Studies of polyamines transport through liquid membranes with D2EHPA as a carrier
Journal of Separation Science, 2008AbstractThe transport of polyamines through the liquid membranes with di‐2‐ethylhexyl phosphoric acid (D2EHPA) was investigated. The study was performed in three main steps: liquid–liquid extraction (LLE), bulk liquid membrane (BLM) extraction, and supported liquid membrane (SLM) extraction.
Katarzyna Dziarkowska +2 more
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Microkinetics and reaction equilibria in the system ZnSO4/D2EHPA/isododecane
Hydrometallurgy, 1999Abstract Studies have been made on the kinetics of zinc extraction for the ZnSO 4 /D2EHPA/isododecane system which is being considered as a Recommended Liquid–Liquid Extraction Test System by the European Federation of Chemical Engineering (EFCE) Working Party on Distillation, Absorption and Extraction.
H.-J. Bart, H.-P. Rousselle
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Investigation of mass transfer on single droplets for the reactive extraction of zinc with D2EHPA
AIChE Journal, 2011AbstractInvestigations of mass transfer behavior with the standard test system of the European Federation of Chemical Engineering (EFCE) for the reactive extraction zinc + D2EHPA (di(2‐ethylhexyl) phosphoric acid) were carried out. Experiments were performed with single droplets in a mass transfer cell on lab‐scale. In the experiments, contact time for
Altunok, Mehmet Yücel +2 more
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