INIQUI   05448
INSTITUTO DE INVESTIGACIONES PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
artículos
Título:
Nanofiltration of glucose: Analysis of parametersand membrane characterization
Autor/es:
JORGE E. ALMAZÁN; ESTELA ROMERO DÓNDIZ; VERÓNICA B. RAJAL; ELZA CASTRO VIDAURRE
Revista:
CHEMICAL ENGINEERING RESEARCH & DESIGN
Editorial:
INST CHEMICAL ENGINEERS
Referencias:
Año: 2015 vol. 94 p. 485 - 493
ISSN:
0263-8762
Resumen:
Membrane characterization and modeling of nanofiltration processes of uncharged solutes are of special interest forthe 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 influ-ence of pressure and concentration of glucose on the permeate flux and rejection were studied. Both membranespresented a great potential for the food industry due to their high rejection of glucose. The osmotic pressure modelwas combined with film theory and the real driven force was calculated taking into account the osmotic pressureand the concentration polarization. Both phenomena influenced the process (concentration polarization only in themost dilute solutions at low pressure) and the permeability for glucose solutions was similar to the hydraulic per-meability. A mathematical model based on the Donnan-Steric Pore Model was used to determine the pore radiusand the effective thickness of both membranes. As the concentration inside the pore (needed for the calculations)is difficult to measure experimentally, various alternatives were proposed. The average of the concentration at theinterface and permeate best fitted the experimental data. The model was applied successfully; the maximum errorwas 8% within the range of concentrations (5?100 g/L) for the DL membrane and 5% for the DK membrane up to50 g/L.