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International Journal of Electrochemistry
Volume 2014, Article ID 304296, 12 pages
http://dx.doi.org/10.1155/2014/304296
Research Article

Selection of the Best Process Stream to Remove Ca2+ Ion Using Electrodialysis from Sugar Solution

1Polymer and Process Engineering Department, IIT Roorkee, Saharanpur Campus, Saharanpur 247 001, India
2Chemical Engineering Department, Indian Institute of Technology, Kanpur 208 016, India

Received 30 July 2014; Revised 3 November 2014; Accepted 14 November 2014; Published 14 December 2014

Academic Editor: Sergio Ferro

Copyright © 2014 Jogi Ganesh Dattatreya Tadimeti et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Electrodialytic removal of calcium chloride (CaCl2, 25–50 mol·m−3) from 5% sugar solution was executed in batch recirculation mode. Calcium ion removal rate was monitored with (i) applied potential, (ii) feed flow rate, (iii) solution viscosity and conductivity, and (iv) catholyte streams (NaOH or sodium salt of ethylene diamine tetraacetic acid-acetic acid, Na2EDTA-AA). Unsteady state model for ion concentration change was written for the ED cell used. Linearized Nernst-Planck equation instead of Ohm’s law was applied to closely obtain the current density and concentration change theoretically. The model developed could closely predict the experimental observation. Mass transfer coefficients and specific energy densities were estimated for each combination of catholyte stream used. NaOH showed better performance for a short duration over Na2EDTA-acetic acid combination.