Mutual separation of two monovalent metal ions by multistage electrodialysis

A multistage electrodialyzer having an enriching section and a stripping one has been developed to separate monovalent cation species in the aqueous solution. A feed solution containing LiCl and KCl is supplied to the middle stage of the dialyzer, and a solution of HCl is supplied to the cathode sta...

Full description

Saved in:
Bibliographic Details
Published in:Chemical engineering science 2005-02, Vol.60 (3), p.727-734
Main Authors: Takahashi, Katsuroku, Umehara, Kohei, Cruz, Gradys Paz T., Nii, Susumu, Kawaizumi, Fumio
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Electrodialysis
Exact sciences and technology
Ion exchange
Membrane
Membrane separation (reverse osmosis, dialysis...)
Multistage operation
Separation
Simulation
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A multistage electrodialyzer having an enriching section and a stripping one has been developed to separate monovalent cation species in the aqueous solution. A feed solution containing LiCl and KCl is supplied to the middle stage of the dialyzer, and a solution of HCl is supplied to the cathode stage. Stages from cathode to feed are the enriching section and those from feed to anode are stripping section. Aqueous solution flows from the cathode stage toward the anode stage as a reflux flow. The ratio K + / Li + in the enriching product increased with the increase in reflux flow rate and decreased with the increase in current density, while the ratio Li + / K + in the stripping product increased with the current density and decreased with the reflux flow rate. Simulation by a stage to stage calculation was carried out by use of the operating equation based on mass balance and the relation of permselectivities alternatively. The calculated results were in good agreement with the experimental ones, and indicated that a large yield of product as well as a large concentration ratio can be achieved by increasing stage number.
ISSN:0009-2509
1873-4405
DOI:10.1016/j.ces.2004.08.042