Highly gas permeable, ultrathin Teflon AF2400/γ-alumina composite hollow fiber membranes for dissolved gas analysis

Sainan Liu, Liang Chih Ma, Chien Hua Chen, Chuan Chen, Jerry Lin

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Dissolved gas analysis (DGA) is a useful approach to monitor the electrical faults of transformers. For extraction of dissolved gases from transformer oil in the DGA process, membrane-based separation represents an appealing technology option since the use of an oil-resistant, stable and highly gas permeable dense membrane can greatly enhance the efficiency by shortening the extraction time. However, most membranes reported in the literature have a membrane thickness in the micrometer range, making these membrane devices not sufficiently effective in practical separation of dissolved gasses from transformer oil. To reduce the thickness of membranes, Teflon AF2400 composite membranes synthesized using three different types of alumina (Al2O3) supports were investigated, including macroporous α-Al2O3 disk support, macroporous α-Al2O3 hollow fiber support, and mesoporous γ-Al2O3/α-Al2O3 hollow fiber support. The result shows that the γ-Al2O3/α-Al2O3 supports with a mesoporous top-coating γ-Al2O3 layer prepared by the sol-gel method could provide a high-quality surface for synthesizing an ultrathin and defect-free Teflon AF2400 layer. For the ultrathin Teflon AF2400/γ-Al2O3 composite hollow fiber membranes prepared by coating with a 0.5 wt% Teflon AF2400 solution, the thickness of the Teflon AF2400 layer is about 270 nm, and the permeances of H2, CH4, CO2 and C2H6 at room temperature can reach to 14,069, 2847, 11,901 and 2030 GPU, respectively, which are about 8 times higher than that of the α-Al2O3 disk or hollow fiber supported membranes. This result demonstrates the promise of the ultrathin Teflon AF2400/γ-Al2O3 composite hollow fiber membranes for extraction of dissolved gases from the transformer oil for DGA.

Original languageEnglish (US)
Pages (from-to)243-250
Number of pages8
JournalJournal of Membrane Science
Volume540
DOIs
StatePublished - Oct 15 2017

Fingerprint

dissolved gases
Gas fuel analysis
gas analysis
Aluminum Oxide
teflon (trademark)
Polytetrafluoroethylene
Polytetrafluoroethylenes
hollow
Alumina
aluminum oxides
Gases
membranes
Membranes
composite materials
fibers
Fibers
Composite materials
gases
Insulating oil
transformers

Keywords

  • Dissolved gas analysis
  • Hollow fiber
  • Teflon AF2400
  • Ultrathin membrane
  • γ-alumina

ASJC Scopus subject areas

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

Cite this

Highly gas permeable, ultrathin Teflon AF2400/γ-alumina composite hollow fiber membranes for dissolved gas analysis. / Liu, Sainan; Ma, Liang Chih; Chen, Chien Hua; Chen, Chuan; Lin, Jerry.

In: Journal of Membrane Science, Vol. 540, 15.10.2017, p. 243-250.

Research output: Contribution to journalArticle

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abstract = "Dissolved gas analysis (DGA) is a useful approach to monitor the electrical faults of transformers. For extraction of dissolved gases from transformer oil in the DGA process, membrane-based separation represents an appealing technology option since the use of an oil-resistant, stable and highly gas permeable dense membrane can greatly enhance the efficiency by shortening the extraction time. However, most membranes reported in the literature have a membrane thickness in the micrometer range, making these membrane devices not sufficiently effective in practical separation of dissolved gasses from transformer oil. To reduce the thickness of membranes, Teflon AF2400 composite membranes synthesized using three different types of alumina (Al2O3) supports were investigated, including macroporous α-Al2O3 disk support, macroporous α-Al2O3 hollow fiber support, and mesoporous γ-Al2O3/α-Al2O3 hollow fiber support. The result shows that the γ-Al2O3/α-Al2O3 supports with a mesoporous top-coating γ-Al2O3 layer prepared by the sol-gel method could provide a high-quality surface for synthesizing an ultrathin and defect-free Teflon AF2400 layer. For the ultrathin Teflon AF2400/γ-Al2O3 composite hollow fiber membranes prepared by coating with a 0.5 wt{\%} Teflon AF2400 solution, the thickness of the Teflon AF2400 layer is about 270 nm, and the permeances of H2, CH4, CO2 and C2H6 at room temperature can reach to 14,069, 2847, 11,901 and 2030 GPU, respectively, which are about 8 times higher than that of the α-Al2O3 disk or hollow fiber supported membranes. This result demonstrates the promise of the ultrathin Teflon AF2400/γ-Al2O3 composite hollow fiber membranes for extraction of dissolved gases from the transformer oil for DGA.",
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