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Relationship between volumetric properties and mass transfer through NF membrane for saccharide/electrolyte systems

Boy, Virginie and Roux-de Balmann, Hélène and Galier, Sylvain Relationship between volumetric properties and mass transfer through NF membrane for saccharide/electrolyte systems. (2012) Journal of Membrane Science, vol. 390-391. pp. 254-262. ISSN 0376-7388

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Official URL: http://dx.doi.org/10.1016/j.memsci.2011.11.046

Abstract

Recent studies have shown that unexpected performances can be obtained with NF membranes, when applied to the treatment of solutions containing significant amount of electrolyte. This study deals with the investigation of the mechanisms governing the mass transfer of neutral species through NF membranes with a focus on the role of ions. More precisely, it consists to determine the apparent molar volume of saccharides, which characterizes the hydration state of solutes in presence of electrolyte, and to assess the relationship between these parameters and those characterizing the mass transfer. The transfer of saccharides of increasing molecular weights (xylose, glucose and sucrose) through a NF membrane is studied in a diffusion regime. Different electrolytes (NaCl, Na₂SO₄, CaCl₂, MgCl₂) are chosen with respect to their hydration level. A specific procedure was developed to dissociate the flux variation due to the modifications of the solute properties and of the membrane material induced by the electrolyte. The results show that the mass transfer modification is mainly due to the influence of the electrolyte on the solute properties. Then, the mass transfer parameters are put in parallel with the apparent molar volume of saccharides measured in solutions of different ionic compositions. For a given electrolyte, Na₂SO₄, a good quantitative relationship is obtained regardless of saccharide nature, concerning the influence of the electrolyte concentration. This result confirms that the saccharide transfer increase can be due to its dehydration in presence of electrolyte. However, from these results, it is not possible to establish a clear relationship regardless of the electrolyte nature.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original PDF can be found at Journal of Membrane Science website: http://www.sciencedirect.com/science/article/pii/S0376738811008738
HAL Id:hal-00878631
Audience (journal):International peer-reviewed journal
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Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Vincent GERBAUD
Deposited On:30 Oct 2013 12:50

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