A pressure swing adsorption process for the selective adsorption of at least one gaseous component from a gaseous mixture and an apparatus for performing the process wherein the gaseous mixture is conducted in cyclic alternation through at least three adsorbers and each adsorber is subdivided into two...http://www.google.com.au/patents/US4732578?utm_source=gb-gplus-sharePatent US4732578 - Pressure swing adsorption process
