Permeation of xylene isomers through supported liquid membranes containing cyclodextrins

Jessie Lue Shingjiang*, Jun Juang Huei, Yin Hou Shian

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

30 Scopus citations

Abstract

The permeation of p- and m-xylenes through supported liquid membranes (SLM) containing cyclodextrins (CDs) was investigated in this study. Three CDs were used in the experiments, α-CD, β-CD, and hydroxypropyl-β-CD (HP-β-CD). The mass transfer mechanisms with and without facilitating carriers (CDs) were studied individually by applying the solution-diffusion model. The facilitated mass transfer mechanism was elucidated as partitioning of xylenes from the organic phase into an aqueous phase, formation of an inclusion complex with CDs, diffusion of the complex, and extraction into the receiving phase. The formation constants in aqueous solutions for CDs and p-xylene were 1.6-2.4 times higher than that of CDs and m-xylene. The diffusivity coefficient of the xylene-CD complex (Dm) and the equilibrium extraction constant (Kex) associated with each CD were determined. Meanwhile, Kex, the parameter used to describe the ability of CD to extract xylene and to form a complex, of p-xylene and CDs was almost twice as much as that for m-xylene and CDs. Thus, the addition of CD into the membrane phase for xylene separation yields a two-fold benefit in favor of p-xylene: an increase in selectivity and an enhancement of the mass transfer flux.

Original languageEnglish
Pages (from-to)463-480
Number of pages18
JournalSeparation Science and Technology
Volume37
Issue number2
DOIs
StatePublished - 2002

Keywords

  • Cyclodextrins
  • Facilitated transport
  • Separation
  • Supported liquid membranes
  • Xylene isomers

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