Mass transfer examination in electrodialysis using limiting current measurements
Tóm tắt
The impact of electrodialysis module characteristics on mass transfer was examined using the limiting current method. The current-voltage curves of different electrodialysis modules were measured and limiting currents were determined using the derivative method. The mass transfer coefficients were calculated and the parameters of their dependence on linear flow velocity were estimated. From these the impact of spacer thickness, spacer net type, membrane type, and module geometry were evaluated. It was found that the impact of spacer thickness was almost negligible within the examined range, but a decrease in the mass transfer coefficient could be expected in the case of thicker spacers. By contrast, the spacer net type and type of membrane were found to be very important parameters able to significantly influence the mass transfer. By modifying the module geometry, the mass transfer coefficient could also be altered and, only in this case, the exponential parameter of the dependence was changing. The parameters thus determined may be used to calculate the limiting current in a wide range of operational conditions and may help predict the performance of different electrodialysis module types.
Tài liệu tham khảo
Balster, J., Pünt, I., Stamatialis, D. F., & Wessling, M. (2006). Multi-layer spacer geometries with improved mass transport. Journal of Membrane Science, 282, 251–361. DOI: 10.1016/j.memsci.2006.05.039.
Burns, J. R., & Jachuck, R. J. J. (2005). Determination of liquid-solid mass transfer coefficients for a spinning disc reactor using a limiting current technique. International Journal of Heat and Mass Transfer, 48, 2540–2547. DOI: 10.1016/j.ijheatmasstransfer.2004.11.029.
Doan, H. D., Fayed, M. E., & Trass, O. (2001). Measurement of local and overall mass-transfer coefficients to a sphere in a quiescent liquid using limiting current technique. Chemical Engineering Journal, 81, 53–61. DOI: 10.1016/s1385-8947(00)00224-2.
Geraldes, V., & Diná Afonso, M. (2010). Limiting current density in the electrodialysis of multi-ionic solutions. Journal of Membrane Science, 360, 499–508. DOI: 10.1016/j.memsci.2010.05.054.
Hall, D. W., Scott, K., & Jachuck, R. J. J. (2001). Determination of mass transfer coefficient of a cross-corrugated membrane reactor by the limiting-current technique. International Journal of Heat and Mass Transfer, 44, 2201–2207. DOI: 10.1016/s0017-9310(00)00274-x.
Huang, T. C., & Yu, I. Y. (1988). Correlation of ionic transfer rate in electrodialysis under limiting current density conditions. Journal of Membrane Science, 35, 193–206. DOI: 10.1016/s0376-7388(00)82443-6.
Káňavová, N., Machuča, L., & Tvrzník, D. (2014). Determination of limiting current density for different electrodialysis modules. Chemical Papers, 68, 324–329. DOI: 10.2478/s11696-013-0456-z.
Káňavová, N., & Machuča, L. (2014). A novel method for limiting current calculation in electrodialysis modules. Periodica Polytechnica — Chemical Engineering, 58, 125–130. DOI: 10.3311/PPch.7145.
Krol, J. J., Wessling, M., & Strathmann, H. (1999). Concentration polarization with monopolar ion exchange membranes: current-voltage curves and water dissociation. Journal of Membrane Science, 162, 145–154. DOI: 10.1016/s0376-7388(99)00133-7.
Lee, H. J., Strathmann, H., & Moon, S. H. (2006). Determination of the limiting current density in electrodialysis desalination as an empirical function of linear velocity Desalination, 190, 43–50. DOI: 10.1016/j.desal.2005.08.004.
Nikonenko, V. V., Pismenskaya, N. D., Istoshin, A. G., Zabolotsky, V. I., & Shudrenko, A. A. (2008). Description of mass transfer characteristics of ED and EDI apparatuses by using the similarity theory and compartmentation method. Chemical Engineering and Processing: Process Intensification, 47, 1118–1127. DOI: 10.1016/j.cep.2007.12.005.
Quiroz, M. A., Martínez-Huitle, U. A., & Martínez-Huitle, C. A. (2005). Mass transfer measurements in a parallel disk cell using the limiting current technique. Journal of the Mexican Chemical Society, 49, 279–283.
Selman, J. R., & Tobias, C. W. (1975). Unsteady-state effects in limiting current measurements. Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 65, 67–85. DOI: 10.1016/0368-1874(75)85106-9.
Strathmann, H. (1991). Electrodialysis. In R. W. Baker, E. L. Cussler, W. Eykamp, W. J. Koros, R. L. Riley, & H. Strathmann (Eds.), Membrane separation systems: Recent developments and future directions (pp. 396–448). Park Ridge, NJ, USA: Noyes Data Corporation.
Turek, M. (2003). Optimization of electrodialytic desalination in diluted solutions. Desalination, 153, 383–387. DOI: 10.1016/s0011-9164(02)01132-3.
Valerdi-Pérez, R., & Ibáñez-Mengual, J. A. (2001). Current—voltage curves for an electrodialysis reversal pilot plant: determination of limiting currents. Desalination, 141, 23–37. DOI: 10.1016/s0011-9164(01)00386-1.