Nanofiltration of glucose: Analysis of parameters and membrane characterization

Abstract

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%

Recovery of monosaccharides from dilute acid corncob hydrolysate by nanofiltration: modeling and optimization

“…With the value of r p in hand, the value of DX/A k could be calculated from the Hagen-Poiseuille equation (eqn (18)), in which the pure water permeability J w /DP was approximately 2.269 Â 10 À11 m Pa À1 s À1 at pH 3, as determined by a pure water permeate experiment. Indeed, this value of J w /DP was similar to that reported by Almazán et al 26 (i.e., 2.79 Â 10 À11 m Pa À1 s À1 ). Thus, the r p and DX/A k values calculated from the model were 0.395 nm and 1.661 mm, respectively, and so these values were employed in the following DSPM-DE model.…”

“…The water consumption efficiency in the diananoltration process is described as eqn (26). The inhibitors remove efficiency is described as eqn (27) The recovery rate of monosaccharides is described as eqn (28)…”

Systematic evaluation of characteristics of the membrane-based fed-batch shake flask

“…Paul et al [ 33 ] propose that the viscosity of the solvent penetrating through the membrane may be the underlying cause for the non-linear transport. Almazán et al [ 34 ] suggest that concentration polarization and rise of osmotic pressure are the causes for the decline of flux through the membrane due to increased resistance to permeation. Further, it was suggested that glucose as an uncharged organic molecule, but with a high dipole moment (~14 Debye) is more likely to be repelled by a membrane charge [ 35 ].…”

Tecnologías de biosorción y membranas en la eliminación de metales pesados

“…Al iniciar los experimentos con una membrana de alta de presión se necesita un acondicionamiento previo de la misma. Para ello, se realizó un lavado de la membrana con el que se eliminó el gel protector que la recubre, tal y como indica el fabricante, haciendo circular por el sistema agua desionizada durante dos horas a una presión de 8 bares (Zhao et al, 2010, Almazán, Romero-Dondiz, Rajal, & Castro-Vidaurre, 2014. El agua de alimentación utilizada para la realización de los ensayos corresponde a aguas sintéticas preparadas en el laboratorio a 10 mg/L de cada metal.…”