Polymeric ionic liquid membranes containing IL-Ag+ for ethylene/ethane separation via olefin-facilitated transport
authors Tome, LC; Mecerreyes, D; Freire, CSR; Rebelo, LPN; Marrucho, IM
nationality International
journal JOURNAL OF MATERIALS CHEMISTRY A
keywords COMPOSITE MEMBRANES; OLEFIN/PARAFFIN SEPARATION; CO2 SEPARATION; SILVER SALT; POLYIMIDE MEMBRANES; GAS SEPARATIONS; FLUE-GAS; MIXTURES; COMPLEXATION; ABSORPTION
abstract This work focuses on the separation of light olefins from their corresponding paraffins using membranes due to their lower energy consumption and operating costs in comparison to the traditionally used methods which are highly energy intensive. Although polymeric ionic liquids (PILs) have attracted much attention as interesting materials to prepare improved gas separation membranes, their exploitation for light olefin/paraffin separation has never been attempted before. In this work, we propose the use of PILs as alternative polymer matrices for olefin/paraffin separation. A new series of facilitated transport membranes of poly([pyr(11)][NTf2]) incorporating different amounts of the ionic liquid ([pyr(14)][NTf2]) and the silver salt (AgNTf2) were prepared by a film casting process and their ethane and ethylene permeation properties were measured at 293 K using a time-lag apparatus. The results show that the preparation of PIL/IL composite membranes increases the permeability of both C2H4 and C2H6, overcoming the hindered gas diffusion in the pure PIL. Nevertheless, the presence of the IL in the composite membrane promotes reduced C2H4/C2H6 permselectivity. The addition of the silver salt greatly boosts the solubility of the olefin in the membranes. Furthermore, increasing the silver ion concentration in the PIL/40% IL system leads to enhanced overall C2H4/C2H6 permselectivity surpassing the upper bound for polymeric membranes, indicating that PILs have interesting potential as polymer matrices for olefin-facilitated transport membranes.
publisher ROYAL SOC CHEMISTRY
issn 2050-7488
year published 2014
volume 2
issue 16
beginning page 5631
ending page 5639
digital object identifier (doi) 10.1039/c4ta00178h
web of science category Chemistry, Physical; Energy & Fuels; Materials Science, Multidisciplinary
subject category Chemistry; Energy & Fuels; Materials Science
unique article identifier WOS:000333524800010
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journal analysis (jcr 2019):
journal impact factor 11.301
5 year journal impact factor 10.694
category normalized journal impact factor percentile 91.814
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