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    Bipolar membrane electrodialysis for mixed salt water treatment: determination of optimum conditions by topsis-based taguchi method
    (Springer, 2023) Oner, M. R.; Ata, O. N.; Yapici, S.
    The distillation waste (DW) is the biggest handicap of soda ash production with the Solvay process. The DW mainly consists of CaCl2 and NaCl, and especially the recent studies clearly show the damage it causes to the environment. With the aim to develop an alternative to the distillation unit in Solvay process, an experimental work was performed to investigate the effect of the working parameters on the different performance criteria for the production of NaOH+NH3.H2O mixture and HCI from simulated salt mixture of NaCI and NH4CI by bipolar membrane electrodialysis, and on the determination of the optimum working conditions. The performance criteria were taken as the acid and base concentrations, product-based salt conversion, product-based flux, energy consumption in the electrodialysis cell, desalination, and impurities in the products. The working parameters were chosen as the initial salt concentration, initial acid and base concentrations, initial acid and base volumes, current density, amount of impurity in product, and anolyte and catholyte concentrations. The experimental design and the search for the optimum working conditions for the performance criteria were performed by the Taguchi-based-multi-criteria decision-making method. Under optimum conditions, the products of 4.04 M HCl with 93.5% purity and 3.66 M NaOH + NH3.H2O with 98.7% purity (on dry basis), and 99.8% desalination were obtained.
  • Küçük Resim Yok
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    Utilization and optimization of a sustainable environmental process for simultaneous recovery of H3BO3 and NaOH from tincal
    (Springer, 2025) Senol, H.; Adiguezel, D.; Kanca, A.; Ata, O. N.; Yapici, S.
    The present study proposes a bipolar membrane electrodialysis (BMED) integrated sustainable environment-friendly process for producing H3BO3 in high purity and NaOH from tincal. Employment of Taguchi experimental design technique supported by TOPSIS optimization method revealed that the optimum process parameters are the initial feed concentration of 160 g NaCl/L and 36 g H3BO3/L, the applied current of 4.2 A, the flow rate of 31 L/h, the initial acid and base concentration of 0.15 M, and the electrolyte concentration of 0.2 M. In the experiment performed under optimum operating conditions, 2.15 M acid and 2.20 M base were obtained. The produced acid solution was determined to contain 10.5 g NaCl/L and 2.8 g H3BO3/L and the base to contain 13.3 g NaCl/L and 6 g H3BO3/L. The boric acid crystals obtained by the crystallization of concentrated feed solution from BMED were determined to have 99.96% purity, which verifies that H3BO3 in high purity can be produced by BMED process. Solid waste and concentrated liquid waste formation of the conventional H3BO3 production process can also be eliminated, and NaOH can be produced at an industrial scale without chlorine gas emission, by using BMED as an alternative to conventional methods. [GRAPHICS] .