Effect of Operating Parameters on the Production of Hydrochloric acid and Sodium Hydroxide by Bipolar Membrane Electrodialysis

Medina Collana J.T.; Ancieta Dextre C.A.; Rodriguez Taranco O.J.; Carrasco Venegas L.A.; Diaz Bravo P.B.; Suero Iquiapaza Agerico P.A.; Cadillo P.; Villanueva Martinez E.W.; Azorza Guillen K.R. · Chemical Engineering Transactions (2025) · DOI: 10.3303/cet25120098

Resumen

In the present research work, a laboratory-scale bipolar electrodialysis unit (EDBM) for the production of hydrochloric acid and sodium hydroxide was constructed and put into operation. In order to evaluate the effect exerted by the cell operating parameters on both acid and base concentrations, Taguchi metrology with an orthogonal L9 matrix was used. Four factors were selected at three levels, initial sodium chloride concentration (5, 20 and 50 g/L), electrical potential (5, 10 and 15 V), flow rate (400, 600 and 800 mL min-1) and initial acid and base concentration (0, 0.025 and 0.05 M). Using Minitab analysis, it was determined that the most influential factor on the concentration of hydrochloric acid and sodium hydroxide was the electrical voltage applied to the EDMB cell. The most suitable operating parameter levels to achieve a higher concentration of hydrochloric acid and sodium hydroxide were electrical voltage (15 V), flow rate (400 mL min -1), sodium chloride concentration (50 g/L) and initial concentration of NaOH and HCl (0.05 M). The results reveal that the constructed EDMB prototype has a high capacity to convert inorganic salts into their respective acidic solutions and hydroxides, which constitutes a valuable green technology for industry. Copyright

Instituciones: Universidad Nacional del Callao