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Membranes 2016, 6(1), 1; doi:10.3390/membranes6010001

Crosslinked PEG and PEBAX Membranes for Concurrent Permeation of Water and Carbon Dioxide

Peter Cook Centre for Carbon Capture and Storage Research, Department of Chemical & Biomolecular Engineering, The University of Melbourne, Melbourne VIC 3010, Australia
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Author to whom correspondence should be addressed.
Academic Editor: Alexey Volkov
Received: 17 November 2015 / Revised: 11 December 2015 / Accepted: 17 December 2015 / Published: 23 December 2015
(This article belongs to the Special Issue Membranes for Environmental Applications)
View Full-Text   |   Download PDF [708 KB, uploaded 23 December 2015]   |  

Abstract

Membrane technology can be used for both post combustion carbon dioxide capture and acidic gas sweetening and dehydration of natural gas. These processes are especially suited for polymeric membranes with polyether functionality, because of the high affinity of this species for both H2O and CO2. Here, both crosslinked polyethylene glycol diacrylate and a polyether-polyamide block copolymer (PEBAX 2533©) are studied for their ability to separate CO2 from CH4 and N2 under single and mixed gas conditions, for both dry and wet feeds, as well as when 500 ppm H2S is present. The solubility of gases within these polymers is shown to be better correlated with the Lennard Jones well depth than with critical temperature. Under dry mixed gas conditions, CO2 permeability is reduced compared to the single gas measurement because of competitive sorption from CH4 or N2. However, selectivity for CO2 is retained in both polymers. The presence of water in the feed is observed to swell the PEG membrane resulting in a significant increase in CO2 permeability relative to the dry gas scenario. Importantly, the selectivity is again retained under wet feed gas conditions. The presence of H2S is observed to only slightly reduce CO2 permeability through both membranes. View Full-Text
Keywords: carbon dioxide capture; poly ethylene glycol; PEBAX; carbon dioxide; water; Lennard Jones; solubility carbon dioxide capture; poly ethylene glycol; PEBAX; carbon dioxide; water; Lennard Jones; solubility
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Scholes, C.A.; Chen, G.Q.; Lu, H.T.; Kentish, S.E. Crosslinked PEG and PEBAX Membranes for Concurrent Permeation of Water and Carbon Dioxide. Membranes 2016, 6, 1.

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