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  • Küçük Resim
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    Comparison of commercial anion-exchange membranes for pickle waste treatment by electro-electrodialysis
    (TAYLOR & FRANCIS INC, 2005) Akgemci, Emine Güler; Ersöz, M; Atalay, T
    This study deals with recovery conditions of acids from the pickle waste of leather industry by applying of electro-electrodialysis process. The pickle waste consists of NaCl, HCOOH, H2SO4, and organic dirt. The four commercial anion exchange membranes (Neosepta AFN, ACM, AMH, and Polysulfone SB-6407) have been used and the necessary specific energies for recovering conditions as well as the most appropriate membranes were determined. In the laboratory-scale experiments, AMH anion-exchange membrane has the best combination of electrochemical, mechanical properties and high ion permselectivity. On the contrary, AFN membrane showed good performance with respect to other membranes used and it has the lowest necessary specific energy. In this method, HCl was also produced from its salt during the recovering process.
  • Küçük Resim
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    Transport of formic acid through anion exchange membranes by diffusion dialysis and electro-electro dialysis
    (TAYLOR & FRANCIS INC, 2004) Akgemci, Emine Güler; Ersöz, M; Atalay, T
    In this study, first, the diffusion dialysis method was used for the transport of formic acid through anion exchange membranes (polysulfone SB-6407, Neosepta AFN, ACM, and AMH). The transport of formic acid was carried Out at different concentration ranges and quantified with the membrane mass-transfer coefficient and diffusion coefficient parameters. Neosepta AFN and SB-6407 membranes were efficient for formic acid transport by the diffusion dialysis method at low concentrations. The second method, electro-electro dialysis was applied as a function of some parameters, Such as concentration ratio and polarization curves at constant flow rate (1.17 x 10(-6) m(3) s(-1)), and at 0.1-M concentration of formic acid. In this method, AMH membrane was found to be effective due to its higher mechanical stability, lower proton leakage, lower water content and higher current efficiency.