Patent ID: 7763100

Claim:
A vacuum pressure swing adsorption (VPSA) process for separating a feed supply gas containing at least one more strongly adsorbable component and at least one less strongly adsorbable product gas component, the process comprising: (a) using a system comprising three or more adsorber beds, (b) continuously feeding a feed supply gas into a feed input end of one adsorber bed, said bed containing at least one adsorbent which preferentially adsorbs the more strongly adsorbable component and withdrawing the at least one less strongly adsorbable product gas component from an exit end of the adsorber bed, (c) providing continuous feeding of the feed supply gas using a single feed blower, (d) purging the adsorber beds using two purge gases of different purity, and (e) producing the product gas component in cycles by steps wherein at any instant during the process, two beds are in an evacuation step and only one bed is in a feed mode.