<p>A gas recovery system comprising a source of gas having a preselected concentration of a desired component ( 9 ), at least one application ( 1 ) that adds impurities to said gas, and at least one an adsorption system ( 6 ) that purifies said gas to produce a purified gas for re-use in application ( 1 ), wherein said at least one adsorption system includes at least one adsorbent bed (A) having at least three layers of adsorbents. A recovery process is also disclosed.</p>
