Characteristics of permeation and separation of xylene isomers through poly(vinyl alcohol) membranes containing cyclodextrin

✍ Scribed by Takashi Miyata; Tooru Iwamoto; Tadashi Uragami

• Book ID: 102940432
• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 847 KB
• Volume: 197
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1996.021970924

✦ Synopsis

Abstract

The characteristics of permeation and separation for xylene isomers through poly(vinyl alcohol) membranes containing cyclodextrin (CD‐PVA membranes) were investigated by pervaporation and evapomeation. Evapomeation is more effective for the separation of xylene isomers through the CD‐PVA membrane than pervaporation. An increase in CD content gives rise to an increase in a p‐xylene‐permselectivity through the CD‐PVA membrane by evapomeation. This is attributed to the stronger affinity of CD for p‐xylene as compared with o‐xylene. Especially, the CD‐PVA membrane at a CD content of 40 wt.‐% shows a higher separation factor than has ever been reported. When the p‐xylene concentration in the feed is lower, the p‐xylene‐permselectivity is improved. The mechanism of permeation and separation for xylene isomers is discussed from the standpoint of solution‐diffusion theory.