Results 191 to 200 of about 1,377 (224)

Reactive Zinc Extraction with D2EHPA in a Kühni Miniplant Column

Chemical Engineering & Technology, 2018
AbstractReactive extraction of Zn2+ with di‐(2‐ethylhexyl) phosphoric acid (D2EHPA) was examined in a multistage countercurrent extraction column of type Kühni. Hydrodynamics and mass transfer for the reactive European Federation of Chemical Engineering (EFCE) test system were comprehensively experimentally investigated in a DN32 Kühni miniplant column.
Christian Korb, Alexander Keller, Hans-Jörg Bart   +2 more
openaire   +1 more source

Droplet phenomena in the Ni/Na/D2EHPA/H2O system

Metallurgical Transactions B, 1977
Droplet behavior in the liquid-liquid extraction of nickel by mixtures of the sodium and hydrogen forms of di-2-ethylhexylphosphoric acid in toluene is reported. Mass transfer to single drops of organic phase dispersed in the aqueous has been measured.
K. Durrani, C. Hanson, M. A. Hughes
openaire   +1 more source

Liquid–liquid extraction in microchannels with Zinc–D2EHPA system

Hydrometallurgy, 2014
Abstract Liquid–liquid extraction experiments have been carried out in two different types of microchannels using water (Zn) D2EHPA + dodecane system, a standard reactive extraction system recommended for evaluation of liquid–liquid extraction equipment.
Mayur Darekar, Nirvik Sen, K.K. Singh, S. Mukhopadhyay, K.T. Shenoy, S.K. Ghosh   +5 more
openaire   +1 more source

Kinetics of extraction of uranium from phosphoric acid by D2EHPA–TBP and D2EHPA–TOPO systems using constant interfacial area stirred cell

Chemical Engineering Science, 2014
Abstract The uranium extraction kinetics with Di-2-Ethyl Hexyl Phosphoric Acid-Tri Butyl Phosphate (D2EHPA–TBP) and Di-2-Ethyl Hexyl Phosphoric Acid-Tri Octyl Phosphine Oxide (D2EHPA–TOPO) dissolved in dodecane has been investigated. The objective of the present study was to identify the reaction location, reaction regime, reaction orders with ...
O.D. Gadgil, V.H. Dalvi, K.T. Shenoy, H. Rao, S.K. Ghosh, J.B. Joshi   +5 more
openaire   +1 more source

REE Extraction with D2EHPA Solution Using a Microcontactor

Теоретические основы химической технологии / Theoretical Foundations of Chemical Engineering
The development of high-intensity extractors operating in the pre-emulsion regime is a promising task in the field of - and -element extraction. In this work, a microcontactor is presented in which it is possible to extract 20% REEs from the initially taken amount in 34 s of phase contact.
E.N. Golubina, N.F. Kizim
openaire   +1 more source

A membrane process to recover extractant D2EHPA in aqueous phase

Chemical Engineering Journal, 2008
A membrane adsorption–extraction process to recover di-(2-ethylhexyl) phosphate (D2EHPA) from the raffinate is developed, i.e. a hollow fiber membrane extraction module, in which raffinate flows in the tube side and n-heptane used as the “extractant” flows in the shell side. The emulsion with D2EHPA, n-heptane and Triton X-114 was used as the simulated
S. Wang, W. Qin, Y.Y. Dai
openaire   +1 more source

Investigation of the influence of acetate ions on cadmium extraction with D2EHPA

Hydrometallurgy, 2014
Abstract In this paper, effect of acetate ions on cadmium solvent extraction with di-2-ethyl hexyl phosphoric acid, D2EHPA, in kerosene as diluent has been investigated. Infrared spectroscopy and slope analysis methods were used to determine metal–organic complex and reaction stoichiometry respectively.
Ehsan Bidari, Mehdi Irannajad, Mahdi Gharabaghi   +2 more
openaire   +1 more source

Separation of Ni and Co by D2EHPA in the Presence of Citrate Ion

Metallurgical and Materials Transactions B, 2017
Recycling processes for the recovery of metallic content from the electronic wastes are environmentally friendly and economical. This paper reports a method for the recovery and separation of Ni and Co from the sulfate solution by the use of D2EHPA. In this regard, the influence of citrate ion, as a carboxylate ligand, was examined in the separation ...
Hamed Nadimi, Davoud Haghshenas Fatmehsari, Sadegh Firoozi   +2 more
openaire   +1 more source

Transient modeling of zinc extraction with D2EHPA in a Kühni column

Chemical Engineering Research and Design, 2013
Abstract The transient extraction of zinc sulfate with D2EHPA (di-2-ethylhexyl phosphoric acid) in a section of a Kuhni column operated with total recirculation of liquid phases was modeled using the back-mixing and the forward-mixing approaches. The mathematical developments for both models as well as their numerical solutions are given in detail ...
Artur Pereira Neto, Marcelo Borges Mansur   +1 more
openaire   +1 more source

The role of kinetics in the extraction of zinc with D2EHPA in a packed column

Hydrometallurgy, 2006
Abstract The role of kinetics of extraction in the design of extraction equipment is becoming more important with the move to reduce organic inventories and phase residence times. This paper examines the influence of the kinetics of ZnSO4 extraction into di-2-ethylhexyl phosphoric acid (D2EHPA) in Shellsol 2046 in a 100 mm diameter, 1 m tall column ...
Jianbing Ji, Kathryn H. Mensforth, Jilska M. Perera, Geoff W. Stevens   +3 more
openaire   +1 more source