| http://www.w3.org/ns/prov#value | - Other gas mixtures can also be separated effectively using the membranes of the invention including, but not limited to those containing carbon dioxide, methane, hydrogen, nitrogen, helium, and mixtures thereof such as carbon dioxide/methane, carbon dioxide/nitrogen, helium/methane, hydrogen/methane, hydrogen/nitrogen, helium/nitrogen, helium/air and so on.
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