The original adsorption capacity of molecular sieves is restored by regeneration or reactivation.

Diagram 6.4.7.1
In order to maintain continuity of adsorption during regeneration of the bed, adsorption takes place in a second adsorber bed. There are various regeneration processes, but these are all based on the same principle. Conditions within the adsorber bed should, in practice, be arranged to result in a moderate loading on the adsorbent.