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Title: Preparation and benchmarking of thin film supported PTMSP-silica pervaporation membranes
Authors: CLAES, Stan 
Vandezande, Pieter
Mullens, Steven
De Sitter, Kristien
Peeters, Roos
VAN BAEL, Marlies 
Issue Date: 2012
Source: JOURNAL OF MEMBRANE SCIENCE, 389, p. 265-271
Abstract: Supported silica filled poly[1-(trimethylsilyl)-1-propyne] (PTMSP) membranes were optimised in terms of silica filler loading and top layer thickness, and applied in the pervaporative separation of dilute aqueous ethanol and butanol mixtures (5 wt.%). Addition of hydrophobic silica clearly increased the permeate flux at the expense of the alcohol/water selectivity. Based on its maximal pervaporation separation index (PSI) an optimum was found for a 25 wt.% silica filled membrane with a PTMSP separating layer of 2.4 μm thickness. This membrane exhibited a flux of 9.5 kg m−2 h−1 in combination with an ethanol/water separation factor of 18.3. In the pervaporation of a butanol/water mixture, a flux of 9.5 kg m−2 h−1 and accompanying separation factor of 104 was obtained. A benchmark of this optimised supported PTMSP-silica nanohybrid membrane against two commercially available PDMS-based membranes clearly demonstrated the superior flux/selectivity combination of the prepared thin film silica filled PTMSP membranes in the removal of alcohols from dilute aqueous mixtures. Compared to the commercial membranes, a 4- and 3-fold increase in flux and a 2- and 3-fold increase in alcohol/water separation factor was observed for the optimised supported PTMSP-silica membrane in the separation of a 5 wt.% ethanol/water and butanol/water mixture, respectively.
Keywords: Poly[1-(trimethylsilyl)-1-propyne]; Hydrophobic silica; Pervaporation; Alcohol recovery; Thin film composite membrane
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ISSN: 0376-7388
e-ISSN: 1873-3123
DOI: 10.1016/L.memsci.2011.10.035
ISI #: 000300529100029
Category: A1
Type: Journal Contribution
Validations: ecoom 2013
Appears in Collections:Research publications

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