Permeation properties of single gases (N2, O2, SF6, CF4) through PDMS and PEBAX membranes

Title
Permeation properties of single gases (N2, O2, SF6, CF4) through PDMS and PEBAX membranes
Authors
김한별이민우박완근이순재이현경이상협
Keywords
sulfur hexafluoride(SF6); tetrafluoromethane(CF4); polymeric membrane; gas separation
Issue Date
2012-06
Publisher
멤브레인(Membrane Journal)
Citation
VOL 22, NO 3, 201-207
Abstract
In this study, we investigated permeation of single gas (N2, O2, CF4, and SF6) through flat sheet membrane composed of PDMS (poly-dimethylsiloxane) and PEBAX (polyether block amides). Gas permeation experiment was performed with various feed pressure. Permeability was estimated using permeation flux measured by continuous-flow technique. The permeability of gases except SF6 in PDMS were decreased with the upstream pressure increased. SF6 is much more permeable than CF4, which is due to higher critical temperature of SF6. The permeability decreased in the following order : O2 > N2 > SF6 > CF4. On the other hand, the permeability of gases in PEBAX followed the order: O2 > N2 > CF4 > SF6 which are opposite of the order of kinematic diameter (Å)(SF6 > CF4 > N2 > O2). The SF6/CF4 pure gas selectivity in PDMS was 2.1 at 0.7 MPa.
URI
http://pubs.kist.re.kr/handle/201004/42720
ISSN
12260088
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KIST Publication > Article
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