Patent ID: 6340382
Filing Date: 2002-01-22
Classification: B01D,C01B,Y02C,Y02P

Abstract:
A pressure swing adsorption (PSA) process for purifying a feed stream containing at least one of H2O, N2, CO2, CH4 and CO, and more than 50 mole % hydrogen, which comprises passing the feed stream at a pressure above atmospheric pressure through a multilayer adsorbent bed, wherein at least one of said H2O, CO2, CH4 and CO is adsorbed from the gas stream prior to passing the stream through a layer of a synthetic zeolite adsorbent having a SiO2/Al2O3 ratio within the range of 2.0-2.5 and selected from the group consisting of CaX, LiX and VSA6 adsorbent to adsorb substantially all of the nitrogen in such stream and recovering purified (>99.9%) hydrogen as product from the multilayer adsorbent bed.