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Hydrogen recovery process

United States Patent

December 12, 2000
View the Complete Patent at the US Patent & Trademark Office
A treatment process for a hydrogen-containing off-gas stream from a refinery, petrochemical plant or the like. The process includes three separation steps: condensation, membrane separation and hydrocarbon fraction separation. The membrane separation step is characterized in that it is carried out under conditions at which the membrane exhibits a selectivity in favor of methane over hydrogen of at least about 2.5.
Baker; Richard W. (Palo Alto, CA), Lokhandwala; Kaaeid A. (Union City, CA), He; Zhenjie (Fremont, CA), Pinnau; Ingo (Palo Alto, CA)
Membrane Technology and Research, Inc. (Menlo Park, CA)
09/ 316,507
May 21, 1999
This invention was made in part with Government support under SBIR award number DE-FG03-98ER82618 awarded by the Department of Energy. The Government has certain rights in this invention.