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Nanofiltratio of glucose and sodium lactate solutions Variations of retention between single- and mixed-solute solutions

Bouchoux, Antoine and Roux-de Balmann, Hélène and Lutin, Florence Nanofiltratio of glucose and sodium lactate solutions Variations of retention between single- and mixed-solute solutions. (2005) Journal of Membrane Science, 258 (1). 123-132. ISSN 0376-7388

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Official URL: http://dx.doi.org/10.1016/j.memsci.2005.03.002


The aim of this work was to investigate NF as a purificatio step, i.e. sugar removal, in the production process of lactic acid from sodium lactate fermentation broth. Experiments were carried out with the Desal 5 DK membrane and solutions of increasing complexity, i.e. single-solute solutions of sodium lactate and glucose and mixed-solute solutions containing both solutes. Concentrations close to those of a fermentation broth were chosen. Experimental results were used to get the variations of the intrinsic retention versus the permeation flu in order to achieve comparisons without the interference of concentration polarization. Quite distinct retentions were obtained for glucose and sodium lactate in single-solute solutions so that the purificatio was expected to be feasible. However, it is pointed out that glucose retention is significantl lower in mixed-solute solutions, i.e. when sodium lactate is present. This decrease is such that the retentions of both solutes become comparable so that any purificatio is unachievable. Experiments were also performed with a salt of a different nature (mineral salt, NaCl). Again, it was found that the presence of NaCl tends to decrease glucose retention. Moreover, the phenomenon is shown to be related to the salt concentration in both cases, i.e. with sodium lactate and NaCl. Some possible explanations of this effect are provided in this paper. Further investigations are still in progress to improve the knowledge of the mechanisms involved.

Item Type:Article
Additional Information:You can find this article in http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TGK-4FV9MH3-1&_user=1072870&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_searchStrId=945917384&_rerunOrigin=google&_acct=C000043979&_version=1&_urlVersion=0&_userid=1072870&md5=8907ec773bea76cecfeec3b0b298720a
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > EURODIA Industrie (FRANCE)
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Génie des Interfaces & Milieux Divisés (GIMD)
Deposited On:02 Jul 2009 08:23

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