Experimental observations of nanofiltration with organic solvents

Abstract This paper reports the flux, retention and stability of nanofiltration (NF) membranes with aqueous and organic solvents, and three selected solutes having the same molecular weight of 350 Da: Orange II, Safranine O and Solvent Blue 35. It appears that the nominal manufacturer-specified molecular weight cut-off is only valid for predicting the rejection in aqueous solutions, and that the retention in organic solvents either for molecules of the same molecular weight or even for the same molecule is unpredictable and depends on the specific solvent. It was found that solute retention in organic solvents is lower than in aqueous solution, and that the solvent has significant influence on the retention. These interesting results were not due to membrane deterioration in the presence of organic solvents for any of the membranes studied in this work.

[1]  David Hasson,et al.  Effect of solvent properties on permeate flow through nanofiltration membranes: Part II. Transport model , 2000 .

[2]  Nandakishore Rajagopalan,et al.  Deacidification of soybean oil by membrane technology , 1996 .

[3]  David Hasson,et al.  Effect of solvent properties on permeate flow through nanofiltration membranes. Part I: investigation of parameters affecting solvent flux , 1999 .

[4]  M. Meireles,et al.  An appropriate molecular size parameter for porous membranes calibration , 1995 .

[5]  Kamalesh K. Sirkar,et al.  Nanofiltration studies of larger organic microsolutes in methanol solutions , 2000 .

[6]  Andrea I. Schäfer,et al.  Nanofiltration of Natural Organic Matter: Removal, Fouling and the Influence of Multivalent Ions , 1998 .

[7]  W. Richard Bowen,et al.  Characterisation and prediction of separation performance of nanofiltration membranes , 1996 .

[8]  K. Košutić,et al.  Porosity of some commercial reverse osmosis and nanofiltration polyamide thin-film composite membranes , 2000 .

[9]  Rémi E. Lebrun,et al.  Treatment of textile dye plant effluent by nanofiltration membrane , 1999 .

[10]  Munir Cheryan,et al.  Solvent recovery and partial deacidification of vegetable oils by membrane technology , 1996 .

[11]  C. Vandecasteele,et al.  A Comparison of Models to Describe the Maximal Retention of Organic Molecules in Nanofiltration , 2000 .

[12]  C. Grøn,et al.  Removal of natural organic matter from two types of humic ground waters by nanofiltration , 1998 .

[13]  David Hasson,et al.  Utilization of the Donnan effect for improving electrolyte separation with nanofiltration membranes , 1996 .

[14]  Nandakishore Rajagopalan,et al.  Consider nanofiltration for membrane separations , 1994 .

[15]  Kamalesh K. Sirkar,et al.  Modeling of nanofiltration - assisted organic synthesis , 1999 .

[16]  B. Van der Bruggen,et al.  Influence of molecular size, polarity and charge on the retention of organic molecules by nanofiltration , 1999 .

[17]  Dibakar Bhattacharyya,et al.  Separation of organic pollutants by reverse osmosis and nanofiltration membranes: Mathematical models and experimental verification , 1999 .

[18]  Robert Rautenbach,et al.  Separation potential of nanofiltration membranes , 1990 .

[19]  Yazhen Xu,et al.  Investigation of the solute separation by charged nanofiltration membrane : effect of pH, ionic strength and solute type , 1999 .