as compared against two trains of 2 bed vsa processes the suggested cycle does not idle the feed blower and does not require product storage tanks duplication of rotating equipment and associated central hardware is not required either the suggested cycle is therefore less capital intensive and more power efficient than two 2 bed vsa trains in summary the suggested process is more efficient than any prior art process for producing large quantities of oxygen gt 60 tpd by adsorption any adsorbent s which can selectively remove water carbon dioxide and nitrogen from air can be used examples of adsorbents capable of removing nitrogen from air include zeolitic molecular sieves such as nax naa cax caa mga and other adsorbents with binary cations examples of adsorbents capable of removing water and carbon dioxide from air are aluminas silicagels and zeolites other desired properties of the adsorbents are i highcrush strength ii high attrition resistance iii large bulk density iv low interpartical void v high heat capacity vi large thermal conductivity vii high n 2 o 2 selectivity viii low oxygen capacity and ix small particle size pressure drop through the adsorbent beds during adsorption and evacuation steps is also important for adsorbent selection to produce larger quantities of gas from an adsorption process keeping allelse constant one has to run shorter cycles this is the basis of rapid pressure swing adsorption processes rpsa in the literature the.