Application of the solution-diffusion-film model for the transfer of electrolytes and uncharged compounds in a nanofiltration membrane

Lydia Pérez; Isabel Escudero; M. Julia Arcos-Martínez; José M. Benito

Journal of Industrial and Engineering Chemistry, Vol.47, 368-374, March, 2017

DOI10.1016/j.jiec.2016.12.007 Export Citation

Application of the solution-diffusion-film model for the transfer of electrolytes and uncharged compounds in a nanofiltration membrane

Lydia Pérez, Isabel Escudero^†, M. Julia Arcos-Martínez¹, and José M. Benito

Department of Biotechnology and Food Science, University of Burgos, Plaza Misael Bañuelos s/n, 09001 Burgos, Spain
¹Department of Chemistry, University of Burgos, Plaza Misael Bañuelos s/n, 09001 Burgos, Spain

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A nanofiltration (NF) process applied to both single solutes (charged and uncharged) and electrolyte mixtures formed by a dominant salt and trace ions was evaluated in this work. Experiments were performed in a pilot plant using a 200 Da cut-off spiral-wound polymeric membrane. The marked differences in rejection of the same trace ion in the presence of different dominant salts were successfully described by the solution-diffusion-film model (SDFM). SDFM was also applied to study the rejection variation of single solutes such as betaine, sucrose, lactic acid and citric acid, and their permeate fluxes, under different applied pressures.

Keywords:Solution-diffusion-film model;Nanofiltration;Dominant salt;Trace ions;Negative rejection

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