Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 469, Issue -, Pages 11-18Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2014.06.025
Keywords
CO2/CH4 separation; Dilute methane; Membrane exchange process
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Funding
- U.S. Department of Energy Small Business Innovation Program (SBIR) [DE-FG02-06ER-84609]
- U.S. Environmental Protection Agency SBIR [EP-D-10-036, EP-D-11-071]
- University at Buffalo, State University of New York
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Methane gas is a valuable energy resource. Methane emissions are the second largest human-caused contributor to global warming. Significant quantities of the methane emissions are vented as carbon dioxide/methane mixtures from landfills and natural gas processing plants, since they are too dilute to burn or flare. This paper describes a novel membrane selective exchange process to upgrade dilute methane emission streams into useful fuel by removing CO2 and introducing oxygen into the methane product stream. This is achieved in a single step without the need for compression. Flat sheet thin film composite membranes based on perfluoropolymers and a spiral wound module were prepared and tested with model dilute methane mixtures. A technical and economic analysis shows that the selective exchange process is cost-effective, improves methane utilization and reduces global warming emissions. (C) 2014 Elsevier B.V. All rights reserved.
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