Patent ID: 7381242

Claim:
A method which may be used for a PSA separation of a gas mixture, wherein said gas mixture comprises hydrogen and impurities which comprise at least one hydrocarbon (C n H m ), comprising: a) contacting said gas mixture with a first adsorbent, wherein said first adsorbent comprises a silica gel, and a second adsorbent, wherein said second comprises an activated charcoal; b) adsorbing at least a portion of the impurities of said gas mixture with said first and said second adsorbents; c) producing hydrogen at a production pressure (P′); d) desorbing at least a portion of said impurities from said adsorbents; and e) producing a waste gas stream, wherein said waste gas stream has a regeneration pressure (P″) between about 2 bar absolute and about 10 bar absolute and wherein said waste gas stream further comprises said impurities, wherein said regeneration pressure (P″) is greater than or equal to a pressure of a fuel network of a petrochemical facility on which the PSA unit is installed.