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http://dx.doi.org/10.14579/MEMBRANE_JOURNAL.2015.25.6.496

Olefin Separation Membranes Based on PEO/PDMS-g-POEM Blends Containing AgBF4/Al(NO3)3 Mixed Salts  

Kim, Sang Jin (Department of Chemical and Biomolecular Engineering, Yonsei University)
Jung, Jung Pyu (Department of Chemical and Biomolecular Engineering, Yonsei University)
Park, Cheol Hun (Department of Chemical and Biomolecular Engineering, Yonsei University)
Kim, Jong Hak (Department of Chemical and Biomolecular Engineering, Yonsei University)
Publication Information
Membrane Journal / v.25, no.6, 2015 , pp. 496-502 More about this Journal
Abstract
Facilitated transport is one of the possible solutions to simultaneously improve permeability and selectivity, which is challenging in conventional polymer-based membranes. Olefin/paraffin separation using facilitated transport membrane has received much attention as an alternative solution to the conventional distillation process. Herein, we report olefin separation composite membranes based on the polymer blends containing $AgBF_4/Al(NO_3)_3$ mixed salts. Free radical polymerization process was used to synthesize an amphiphilic graft copolymer of poly(dimethyl siloxane)-graft- poly(ethylene glycol) methyl ether methacrylate (PDMS-g-POEM). In addition, poly(ethylene oxide) (PEO) was introduced to the PDMS-g-POEM graft copolymer to form polymer blends with various ratios. The propylene/propane mixed-gas selectivity and permeance reached up to 5.6 and 10.05 GPU, respectively, when the PEO loading was 70 wt% in polymer blend. The improvement of olefin separation performance was attributed to the olefin facilitating silver ions as well as the highly permeable blend matrix. The stabilization of silver ions in the composite membrane was achieved through the introduction of $Al(NO_3)_3$ which suppressed the reduction of silver ions to silver particles.
Keywords
facilitated transport; olefin; graft copolymer; silver ion; mixed salt;
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Times Cited By KSCI : 5  (Citation Analysis)
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