Authors Lenk, W. ; Meier-Haack, J.
Title Polyelectrolyte multilayer membranes for pervaporation separation of aqueous-organic mixtures
Date 20.08.2002
Number 10810
Abstract Composite membranes for pervaporation of water/alcohol mixtures were prepared by consecutive alternating adsorption of poly(acrylic acid) (polyanion) and poly(ethylenimine) (polycation) on a polyamide-6 substrate. The influence of preparation conditions on the pervaporation separation properties of polyelectrolyte multilayer composite membranes was studied. Variation of polyelectrolyte concentration of the dipping solution and adsorption time had only a minor effect on the membrane performance. On the other hand, high molecular weight polyelectrolytes had a high impact on membrane performance. A separation factor a of 2500 was observed for a membrane having four double layers. Best results were obtained when the adsorption temperature was raised from 25°C to 80°C A membrane with two double layers showed a separation factor a of 900.
Publisher Desalination
Citation Desalination 148 (2002) 11-16

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