Title: Pervaporation of water-alcohol mixtures and acetic acid-water mixtures
Authors: Van Baelen, D ×
Van der Bruggen, Bart
Van den Dungen, K
Degrève, Jan
Vandecasteele, Carlo #
Issue Date: Mar-2005
Publisher: Elsevier
Series Title: Chemical Engineering Science vol:60 issue:6 pages:1583-1590
Abstract: In this study, pervaporation experiments were performed with methanol-water mixtures, ethanol-water mixtures, IPA (isopropyl alcohol)-water mixtures, and acetic acid-water mixtures, over the complete concentration range allowed by the membrane (Pervap 2201, Sulzer). The results of the three water-alcohol mixtures are compared to investigate the influence of molecular weight and polarity on the permeation behavior. The results show that ethanol and IPA have a similar permeation behavior, whereas methanol shows a different behavior. This can be explained by the relatively high polarity of methanol, which makes methanol sorption competitive with water sorption. The IPA-water mixtures are compared with the acetic acid-water mixtures. IPA and acetic acid have approximately the same molecular weight, but contain a different functional group. The acetic acid-water mixtures have a higher total flux than the IPA-water mixtures. Moreover, the partial acetic acid flux is higher than the partial IPA flux. Acetic acid contains a carbonyl group, which has a high capacity of forming hydrogen bonds with the alcohol groups of the PVA (polyvinyl alcohol) top layer. Moreover, it is a large molecule, causing high swelling resulting in a high permeation flux and a low separation factor. The behavior of the acetic acid-water mixtures shows more resemblance to the methanol-water mixtures than to the IPA-water mixtures. This suggests that the polarity and functional group of the different feed components is more important than the molecular size. (C) 2004 Elsevier Ltd. All rights reserved.
ISSN: 0009-2509
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Process Engineering for Sustainable Systems Section
Bio- & Chemical Systems Technology, Reactor Engineering and Safety Section
× corresponding author
# (joint) last author

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