Multi-layer composite hollow fiber membranes derived from poly(ethylene glycol) (PEG) containing hybrid materials for CO2/N2 separation

Hang Zheng Chen, You Chang Xiao, Tai Shung Chung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

58 Scopus citations

Abstract

With the aim to make newly developed materials to be more industrially relevant, multi-layer composite hollow fiber membranes were molecularly designed by surface coating ultrathin layers of a poly(ethylene glycol) (PEG) containing hybrid material onto the polyethersulfone (PES) porous substrate for CO2/N2 separation. The asymmetric PES hollow fiber substrate was prepared by a dry-jet wet spinning process. Multiple ultrathin layers of the PEG containing hybrid polymer were then coated onto the substrate by continuous coating equipment that can be readily scaled up for industrial applications. The effects of substrate characteristics, coating concentration, pre-wetting agent, number of coating and testing conditions on gas separation performance of composite membranes have been investigated and elucidated. Positron annihilation spectroscopy (PAS) was used to investigate the evolution of coating thickness. The ultimate thickness of the dense selective layer is approximately 150nm. The membrane fabricated from a 0.5wt% coating solution shows an impressive CO2/N2 selectivity of 50 with the CO2 permeance of 30GPU at 25°C and 0.2MPa (2atm).

Original languageEnglish (US)
Pages (from-to)211-220
Number of pages10
JournalJournal of Membrane Science
Volume381
Issue number1-2
DOIs
StatePublished - Sep 30 2011
Externally publishedYes

Keywords

  • Composite membrane
  • Gas separation
  • Hollow fiber
  • Poly(ethylene glycol) (PEG)

ASJC Scopus subject areas

  • Biochemistry
  • General Materials Science
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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