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Analysis of molar flux and current density in the electrodialytic separation of sulfuric acid from spent liquor using an anion exchange membrane

  • Separation Technology, Thermodynamics
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Abstract

Separation of sulfuric acid from a dilute solution involved a plate and frame type electrodialysis unit using a commercial anion exchange membrane. Experiments were conducted in batch with catholyte concentrations ranging from 1 to 5 wt%. Effect of applied current density, initial catholyte concentration and initial concentration difference of catholyte and anolyte on the molar flux was studied extensively. The maximum molar flux was estimated to be 10.52×10-8 mol cm-2s-1 at 4.45 wt% catholyte concentration and applied current density of 30 mA cm-2. Current efficiencies were observed to be 75 to 85% at lower current density, which rose to more than 100% at 20 and 30mA cm-2, at equal initial concentration of catholyte and anolyte. Diffusive flux and flux due to membrane potential contributed very less compared to total flux in presence of applied electric current. An equation was developed to predict the practical molar fluxes, which fitted satisfactorily with minor standard deviation. Pristine and used membrane specimens were characterized using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM).

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Authors and Affiliations

  1. Department of Chemical Engineering, Viswakarma Government Engineering College, Chandkheda, 382424, Gujarat, India

    Beena Sheth

  2. Department of Chemical Engineering, G. H. Patel College of Engineering & Technology, Vallabh Vidyanagar, 388120, Gujarat, India

    Kaushik Nath

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  1. Beena Sheth
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  2. Kaushik Nath
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Correspondence to Kaushik Nath.

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Sheth, B., Nath, K. Analysis of molar flux and current density in the electrodialytic separation of sulfuric acid from spent liquor using an anion exchange membrane. Korean J. Chem. Eng. 35, 1878–1888 (2018). https://doi.org/10.1007/s11814-018-0091-z

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  • DOI: https://doi.org/10.1007/s11814-018-0091-z

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