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Title: Enhanced performance in pervaporation of supercritical carbon dioxide treated poly[1-(trimethylsilyl)-1-propyne] membranes
Authors: CLAES, Stan
Vandezande, Pieter
Mullens, Steven
VAN BAEL, Marlies
Maurer, Frank H. J.
Issue Date: 2011
Citation: JOURNAL OF MEMBRANE SCIENCE, 382 (1-2). p. 177-185
Abstract: The effect of a supercritical carbon dioxide (scCO(2)) treatment on the free volume of poly[1-(trimethylsilyl)-1-propyne] (PTMSP) and PTMSP-silica nanohybrid membranes was investigated with positron annihilation lifetime spectroscopy (PALS) and correlated with their performance in pervaporation. Treatment of dense unfilled PTMSP and silica filled PTMSP (2.5, 10 and 20 wt.% silica) membranes with scCO(2) at different pressures and temperatures, resulted in a clear increase in the mean free volume size and an enhanced performance in the pervaporative separation of an aqueous ethanol mixture. Specific permeation rate increases up to 76% were observed for the unfilled membranes treated with scCO(2) at 70 degrees C and 24 MPa. The scCO(2)-treatment could thus be seen as an effective alternative to PTMSP-silica (50 wt.%) membranes, which cause a 72% increase in specific permeation rate. Moreover, the ethanol concentration in the permeate increases significantly upon treating the membranes with scCO(2). (C) 2011 Elsevier B.V. All rights reserved.
Notes: [Claes, S; Vandezande, P; Mullens, S] Flemish Inst Technol Res VITO, B-2400 Mol, Belgium. [Claes, S; Van Bael, MK] Hasselt Univ, Lab Inorgan & Phys Chem, Inst Mat Res, B-3590 Diepenbeek, Belgium. [Van Bael, MK] IMEC VZW, Div IMOMEC, B-3590 Diepenbeek, Belgium. [Maurer, FHJ] Lund Univ, Dept Chem, SE-22100 Lund, Sweden. claes.stan@gmail.com
URI: http://hdl.handle.net/1942/12326
DOI: 10.1016/j.memsci.2011.08.009
ISI #: 000295503800018
ISSN: 0376-7388
Category: A1
Type: Journal Contribution
Validation: ecoom, 2012
Appears in Collections: Research publications

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