Please cite this article as: Almazán, J.E., Romero-Dondiz, E.M., Rajal, V.B., Castro-Vidaurre, E.F.,Nanofiltration of glucose: analysis of parameters and membrane characterization, Chemical Engineering Research and Design (2014), http://dx.doi.org/10. 1016/j.cherd.2014.09.005 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. 4251006.E-mail address: emilioalmazan8787@gmail.com AbstractMembrane characterization and modeling of nanofiltration processes of uncharged solutes are of special interest for the food industry. In this work two commercial membranes, DK and DL, were used to concentrate glucose solutions. Membranes were characterized according hydrophobicity, thickness, porosity, and hydraulic permeability. The influence of pressure and concentration of glucose on the permeate flux and rejection were studied. Both membranes presented a great potential for the food industry due to their high rejection of glucose. The osmotic pressure model was combined with film theory and the real driven force was calculated taking into account the osmotic pressure and the concentration polarization. Both phenomena influenced the process (concentration polarization only in the most dilute solutions at low pressure) and the permeability for glucose solutions was similar to the hydraulic permeability. A mathematical model based on the Donnan-Steric Pore Model was used to determine the pore radius and the effective thickness of both membranes. As the concentration inside the pore (needed for the calculations) is difficult to measure experimentally, various alternatives wereproposed. The average of the concentration at the interface and permeate best fitted the experimental data. The model was applied successfully; the maximum error was 8% within the range of concentrations (5 -100 g/L) for the DL membrane and 5% for the DK membrane up to 50 g/L.Page 2 of 26 A c c e p t e d M a n u s c r i p t 2 HighlightsTwo membranes were characterized and used to concentrate glucose solutions Both membranes presented a great potential due to their high rejection of glucoseThe osmotic pressure and concentration polarization effects were taken into accountMembrane pore radius and effective thickness were determinedThe model fitted successfully the experimental data with maximum errors of 8%

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