Title: Investigation of the permeability and selectivity of gases and volatile organic compounds for polydimethylsiloxane membranes
Authors: De Bo, I ×
Van Langenhove, H
Pruuost, P
De Neve, J
Pieters, J
Vankelecom, Ivo
Dick, E #
Issue Date: 2003
Series Title: Journal of membrane science vol:215 issue:1-2 pages:303-319
Conference: date:State Univ Ghent, Dept Organ Chem, Res Grp Environm Organ Chem & Technol, Fac Agr & Appl Biol Sci, B-9000 Ghent, Belgium; State Univ Ghent, Res Grp Biosyst Engn, Dept Agr Engn, Fac Agr & Appl Biol Sci, B-9000 Ghent, Belgium; Catholic Univ Louvain, Dept Interphase Chem, Ctr Surface Chem & Catalysis, Fac Agr & Appl Biol Sci, B-3001 Heverlee, Belgium; State Univ Ghent, Fluid Mech Lab, Dept Flow Heat & Combust Mech, Fac Sci Appl, B-9000 Ghent, Belgium
Abstract: Selectivity of oxygen, carbon dioxide, ethylene, dimethyl sulphide, trichloroethylene and toluene from air and their permeability (P) and diffusivity (D-m) are reported for a polydimethylsiloxane (PDMS) membrane at 30degreesC. All are constants within the studied feed concentration interval (0.04-233 g m(-3)). The presence of oxygen in the vapour/air mixtures has no significant influence on the vapour permeation. All resistances for mass transfer are determined in the PDMS membrane while gas phase resistances are negligible. Increasing feed concentration or decreasing membrane thickness results in a linear increase of the compound's permeation. Computer simulations of the permeation tests indicate that the concentration in the permeate stream along the membrane sheet can be approximated by a logarithmic concentration profile. The highest permeability and lowest diffusivity are found for toluene, followed by trichloroethylene, dimethyl sulphide, ethylene, carbon dioxide and oxygen. Ratios between lowest and highest value for P and D-m were 300 and 11, respectively. The relative high selectivity of vapours compared to oxygen can hinder an optimal bioreactor operation for breaking down gaseous pollutants when a PDMS membrane is used as gas/liquid contactor. In some cases, it is expected that unsufficient amounts of oxygen permeate for complete metabolisation of the pollutants. (C) 2003 Elsevier Science B.V. All rights reserved.
ISSN: 0376-7388
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Centre for Surface Chemistry and Catalysis
× corresponding author
# (joint) last author

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