초록 ▼

This invention provides a pressure swing adsorption process for purifying a synthesis gas stream containing from 60 to 90 mole % hydrogen and impurities such as CO2, CH4, N2, and CO. The PSA process of the invention further provides a method of adsorbing substantially all of the nitrogen and other c

This invention provides a pressure swing adsorption process for purifying a synthesis gas stream containing from 60 to 90 mole % hydrogen and impurities such as CO2, CH4, N2, and CO. The PSA process of the invention further provides a method of adsorbing substantially all of the nitrogen and other contaminants from the feed gas stream; wherein the feed stream is passed at superatmospheric pressure through a plurality of adsorbent beds and each adsorbent bed contains at least a CaX, LiA, LiX or calcium containing mixed cation zeolite having a SiO2/Al2O3 mole ratio of 2.0-2.5. Such process involves sequentially pressurizing, depressurizing, purging and repressurizing the adsorbent beds with product hydrogen, and recovering product hydrogen in purities of 99.9% or greater from the beds.

대표청구항 ▼

1. 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

1. 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.