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Open AccessFeature PaperReview

Review of Membranes for Helium Separation and Purification

1
Department of Chemical & Biomolecular Engineering, The University of Melbourne, Melbourne, VIC 3010, Australia
2
Department of Chemical Engineering, College of Engineering, Qatar University, Doha 2713, Qatar
*
Author to whom correspondence should be addressed.
Academic Editor: Klaus Rätzke
Membranes 2017, 7(1), 9; https://doi.org/10.3390/membranes7010009
Received: 12 October 2016 / Revised: 12 January 2017 / Accepted: 25 January 2017 / Published: 17 February 2017
(This article belongs to the Special Issue Feature Papers)
Membrane gas separation has potential for the recovery and purification of helium, because the majority of membranes have selectivity for helium. This review reports on the current state of the research and patent literature for membranes undertaking helium separation. This includes direct recovery from natural gas, as an ancillary stage in natural gas processing, as well as niche applications where helium recycling has potential. A review of the available polymeric and inorganic membranes for helium separation is provided. Commercial gas separation membranes in comparable gas industries are discussed in terms of their potential in helium separation. Also presented are the various membrane process designs patented for the recovery and purification of helium from various sources, as these demonstrate that it is viable to separate helium through currently available polymeric membranes. This review places a particular focus on those processes where membranes are combined in series with another separation technology, commonly pressure swing adsorption. These combined processes have the most potential for membranes to produce a high purity helium product. The review demonstrates that membrane gas separation is technically feasible for helium recovery and purification, though membranes are currently only applied in niche applications focused on reusing helium rather than separation from natural sources. View Full-Text
Keywords: helium; membranes; polymeric; selectivity; process helium; membranes; polymeric; selectivity; process
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Scholes, C.A.; Ghosh, U.K. Review of Membranes for Helium Separation and Purification. Membranes 2017, 7, 9.

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