Title of article :
Application of the Nernst–Planck approach to model the electrodialytic recovery of disodium itaconate
Author/Authors :
Marcello Fidaleo، نويسنده , , Mauro Moresi، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2010
Pages :
12
From page :
393
To page :
404
Abstract :
The Nernst–Planck approach, previously used to model the electrodialytic recovery of univalent electrolytes, was used to comply with the recovery of a diprotic acid (i.e., itaconic acid) once it had been converted into its disodium salt. In this way, by applying sequentially the same experimental procedure formerly developed, it was possible to determine all the engineering parameters (i.e., ion transport numbers in solution and electro-membranes; effective solute and water transport numbers; effective membrane surface area, surface resistances and limiting current intensity) of the electrodialytic process of concern. Whereas the cationic membrane resistance (Rc) was found to be approximately constant (0.16 ± 0.01) and independent of solute concentration, the anionic membrane one (Ra) was generally greater than Rc and decreased from about 2 Ω to an asymptotic value of ∼0.6 Ω as the bulk solution electrical conductivity (κ) ranged from 0.05 to 3 S m−1. Use of all the above engineering parameters yielded a satisfactorily prediction of the voltage applied to the electro-membrane pack in two batch desalination trials carried out under constant electric current of 0.75 and 1.5 A. The electro-membranes used exhibited an almost ideal behaviour and only the itaconate anions carried the electric charge passing through the anionic membrane. The overall performance of this ED process was characterised in terms of a current efficiency (CE) of about 97% and a specific energy consumption (ɛ) increasing from 0.28 to 0.48 kWh kg−1 for a solute recovery yield of 98% as the current density (j) was increased from 147 to 294 A m−2.
Keywords :
Electro-membrane resistance , Limiting current density , Disodium itaconate , Modelling , Transport numbers , Specific energy consumption , Electrodialysis
Journal title :
Journal of Membrane Science
Serial Year :
2010
Journal title :
Journal of Membrane Science
Record number :
1355025
Link To Document :
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