Dehydration of 1,4-dioxane through blend membranes of poly(vinyl alcohol) and chitosan by pervaporation

✍ Scribed by D. Anjali Devi; B. Smitha; S. Sridhar; T.M. Aminabhavi

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 381 KB
• Volume: 280
• Category: Article
• ISSN: 0376-7388
• DOI: 10.1016/j.memsci.2006.01.006

✦ Synopsis

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.