Effects of hydrolyzed PIM-1 in polyimide-based membranes on C2–C4 alcohols dehydration via pervaporation

Wai Fen Yong, Peymen Salehian, Liling Zhang, Tai-Shung Chung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Polymers of intrinsic microporosity, specifically PIM-1, have attracted significant attention for gas separation due to its relatively high permeability and reasonably good selectivity. Although few studies evaluated the potential of PIM-1 in pervaporation, their dehydration performance was not impressive because of low selectivity. In this work, we aim to develop a simple but effective approach to enhance the selectivity of PIM-1 while preserving its high permeability for pervaporation dehydration through blending it with different polyimides. The miscibility characteristics of the newly developed membranes in terms of free energy of mixing are examined by molecular simulation while the degrees of swelling in solvents and the changes in interstitial space are characterized by sorption analyses and X-ray diffraction (XRD), respectively. By optimizing the blend ratio, a simultaneously good flux and separation factor have been achieved. For example, the Matrimid membrane containing 20 wt% hydrolyzed PIM-1 (hPIM-1) possesses a high flux of exceeding 47.8 g/m2h and a separation factor of more than 5000 for the dehydration of 1-butanol. This work may provide an inspiration of exploring the potential of gas separation membranes for pervaporation applications.

Original languageEnglish (US)
Pages (from-to)430-438
Number of pages9
JournalJournal of Membrane Science
Volume523
DOIs
StatePublished - Feb 1 2017

Keywords

  • Compatibility
  • Dehydration
  • Pervaporation
  • Polyimides
  • polymers of intrinsic microporosity

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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