Membrane and Water Treatment

  • 제2권3호
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  • Pages.187-205
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  • 2011
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  • 2005-8624(pISSN)
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  • 2092-7037(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Modeling the electric transport of HCl and H3PO4 mixture through anion-exchange membranes

  • 투고 : 2011.02.16
  • 심사 : 2011.06.27
  • 발행 : 2011.07.25
⟨ 이전 논문 다음 논문 ⟩

초록

The electric transport of the mixture of hydrochloric and phosphoric acids through strong base (Neosepta ACM) and weak base (Selemion AAV) anion-exchange membranes was investigated. The instantaneous efficiency of HCl removal from the cathode solution, $CE_{Cl}$, with and without $H_3PO_4$ was determined. It was found that $CE_{Cl}$ was 0.8-0.9 if the number of moles of elementary charge passed through the system, $n_F$, did not exceed ca. 80% of the initial number of HCl moles in the cathode solution, $n_{Cl,ca,0}$. The retention efficiency of $H_3PO_4$ in that range was close to one. The transport of acid mixtures was satisfactorily described by a model based on the extended Nernst-Planck and Donnan equations for $n_F$ not exceeding $n_{Cl,ca,0}$. Among the tested model parameters, most important were: concentration of fixed charges, the porosity-tortuosity coefficient, and the partition coefficient of an undissociated form of $H_3PO_4$. For the both membranes, the obtained optimal values of fixed charge concentration, $\bar{c}_m$, were up to 40% lower than the literature values of $\bar{c}_m$ obtained from the equilibrium measurements. Regarding the $H_3PO_4$ equilibria, it was sufficient to consider $H_3PO_4$ as a monoprotic acid.

키워드

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  3. Modeling the transport of sulfuric acid and its sulfates (MgSO4, ZnSO4, Na2SO4) through an anion-exchange membrane vol.342, 2014, https://doi.org/10.1016/j.desal.2013.10.025
  4. Continuous ion-exchange membrane electrodialysis of mother liquid discharged from a salt-manufacturing plant and transport of Cl- ions and SO42- ions vol.3, pp.1, 2011, https://doi.org/10.12989/mwt.2012.3.1.063