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Study of the mass transfer phenomena involved in an electrophoretic membrane contactor

Galier, Sylvain and Roux-de Balmann, Hélène Study of the mass transfer phenomena involved in an electrophoretic membrane contactor. (2001) Journal of Membrane Science, Vol. 194 30 November 2001, Pages 117-133 (n°1). pp. 117-133. ISSN 0376-7388

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Official URL: http://dx.doi.org/10.1016/S0376-7388(01)00527-0

Abstract

Electrophoretic separators, in which a porous membrane is used as a contactor, offer the possibility to scale up electrophoresis as well as to extend the field of application of electrodialysis to fractionate polyamino acids, peptides or small proteins for instance. This paper deals with the study of the mass transfer mechanisms involved in such electroseparation processes. On one hand, a theoretical approach is carried out. The different contributions to the mass transfer are considered in order to establish a relationship providing the solute concentration as function of the main parameters of the system, i.e. the operating conditions and the membrane, buffer and solute characteristics. In this expression, a partition coefficient is used to represent the interactions taking place at the membrane–solution interface. Then, an experimental study is performed with different representative solutes using a prototype apparatus in order to determine the dependence of the solvent and solute transfer with respect to the operating and physicochemical parameters of the system. The experimental results show the existence of a limiting electro-osmotic flux, the origin of which is explained. Then the partition coefficient is determined for any set of conditions by fitting the variations of the solute concentration calculated by the model with experimental ones. The dependence of the partition coefficient with respect to the solute and buffer characteristics, together with that of the transmission coefficient obtained during filtration experiments, shows that the main limitation with respect to the mass transfer is due to electrostatic interactions taking place at the membrane–solution interface.

Item Type:Article
Additional Information:http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TGK-440B7RP-B&_user=1072870&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_searchStrId=947214229&_rerunOrigin=scholar.google&_acct=C000043979&_version=1&_urlVersion=0&_userid=1072870&md5=d6c1c4cf325f4b9ac4b6313e162a6e92
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Génie des Interfaces & Milieux Divisés (GIMD)
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Deposited By:Guylène Abadie

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