Fabrication of Crosslinkable Hollow Fiber Membranes for Pervaporation Dehydration

Document Type : Research Paper

Authors

Central South University

Abstract

Integrally-skinned asymmetric Polyetherimide/Poly (vinyl alcohol) (PEI/PVA) hollow fber membranes for pervaporation dehydration were fabricated by non-solvent induced phase inversion. PVA inside the PEI matrix could be crosslinked to provide membrane performance stability during long term operation. The effects of different PEI/PVA blend ratio, external coagulant type and flow rate, and crosslinking conditions on the membrane structure and the separation performance were investigated. Generally, hollow fbers using PEI/PVA blend are less selective than those of neat PEI, probably due to the defects evolved between PEI and PVA. The influence of coagulant type on membrane pervaporation performance was specifc to dope formulation; when using n-butanol as external coagulant, the higher the coagulant flow rate, the better the membrane separation performance. PVA crosslinking by maleic acid (MA) enhanced the membrane performance, obviously. PEI/PVA Hollow fbers formed using n-butanol as external coagulant obtained a separation factor of 28 after crosslinking, much better than 4.4 with the original one. The crosslinked membrane exhibited higher stability than the neat PEI membrane. The separation factor of the latter degraded by more than half after around 200 h operation. Finally, this work has provided a new approach for fabricating crosslinkable asymmetric membrane suitable for pervaporation dehydratio.

Graphical Abstract

Fabrication of Crosslinkable Hollow Fiber Membranes for Pervaporation Dehydration

Highlights

• A new type of crosslinkable integrally-skinned asymmetric hollow fbers were
developed.
• The material for the hollow fbers is Polyetherimide/Polyvinyl alcohol blend.
• The external coagulant composition has influence on the hollow fber performance.
• Chemical crosslinking using maleic acid dissolved in water enhances the separation
factors of the hollow fbers.
• Chemical crosslinking was confrmed by FTIR and XPS analyses.

Keywords

Main Subjects

References

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Journal of Membrane Science and Research
Volume 3, Issue 4
October 2017
Pages 281-290

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History

  • Receive Date: 09 June 2016
  • Revise Date: 24 July 2016
  • Accept Date: 24 July 2016

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