Patent ID: 7628843

Claim:
A method for producing hydrogen by Pressure Swing Adsorption in a PSA unit, comprising; introducing a feedstock gas containing hydrogen into said PSA unit at a first pressure, wherein said PSA unit produces a waste gas stream, compressing said waste gas stream to a second pressure, in a first compressor, thereby producing a compressed waste gas stream, wherein said second pressure is lower than said first pressure, introducing said compressed waste gas stream into a fuel gas mixture distribution network, wherein said fuel gas mixture distribution network contains a fuel gas mixture comprising hydrogen, thereby producing a blended stream; removing a portion of said blended stream from said fuel gas mixture distribution network, compressing said blended stream portion to a third pressure, in a second compressor, thereby producing a compressed blended stream portion, wherein said third pressure is equal to or greater than said first pressure, and introducing said compressed blended stream portion into said PSA unit.