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Membrane-augmented cryogenic methane/nitrogen separation

United States Patent

5,647,227
July 15, 1997
View the Complete Patent at the US Patent & Trademark Office
A membrane separation process combined with a cryogenic separation process for treating a gas stream containing methane, nitrogen and at least one other component. The membrane separation process works by preferentially permeating methane and the other component and rejecting nitrogen. The process is particularly useful in removing components such as water, carbon dioxide or C.sub.3+ hydrocarbons that might otherwise freeze and plug the cryogenic equipment.
Lokhandwala; Kaaeid (Menlo Park, CA)
Membrane Technology and Research, Inc. (Menlo Park, CA)
08/ 608,707
February 29, 1996
This invention was made in part with Government support under Contract Number DE-FG03-94ER81809, awarded by the U.S. Department of Energy. The Government has certain rights in this invention.