Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 280, Issue 1-2, Pages 138-147Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2006.01.006
Keywords
pervaporation; PVA/CS blend; dioxane-water azeotrope; selectivity; flux
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Blend membranes prepared from poly(vinyl alcohol) (PVA) and chitosan (CS) were crosslinked with glutaraldehyde and used in the pervaporation dehydration of 1,4-dioxane. Membranes were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and X-ray diffraction (X-RD) to assess, respectively, the intermolecular interactions, thermal stability and crystallinity. Equilibrium sorption studies were carried out in pure liquids and binary mixtures of different compositions of water+1,4-dioxane mixtures to assess the polymer-liquid interactions. The crosslinked membrane showed a good potential in breaking the azeotrope of 82 wt.% aqueous 1,4-dioxane giving a selectivity of 117 with a reasonable water flux of 0.37 kg/m(2) h. The effect of operating parameters such as feed composition, membrane thickness and permeate pressure was evaluated. (c) 2006 Elsevier B.V. All rights reserved.
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