Process for aftertreatment of regeneration offgas

A process for cleaning a regeneration off-gas which is obtained in the regeneration of a sorbent laden with a target component by passing a purge gas over or through it, the process comprising:

• (a) providing the sorbent laden with the target component and the purge gas,
• (b) introducing the purge gas as continuous purge gas stream into a sorbent vessel containing the laden sorbent and discharging the purge gas stream laden with the target component as regeneration offgas stream from the sorbent vessel, wherein the target component is eluted at some juncture as a peak from the sorbent vessel and an at least partly regenerated sorbent is obtained,
• (c) introducing the regeneration off-gas stream into a gas scrubbing apparatus, contacting the regeneration off-gas stream with a scrubbing medium in the gas scrubbing apparatus, discharging the regeneration off-gas stream that has been at least partly freed of the target component and the scrubbing medium laden with the target component from the gas scrubbing apparatus,
• wherein, during the entry of the peak of the target component into the gas scrubbing apparatus and for defined periods of time tv, tn before and after the entry of the peak of the target component into the gas scrubbing apparatus, the regeneration off-gas stream is contacted with a first volume flow rate of the scrubbing medium and the scrubbing medium laden with the target component is stored at a first pressure in a first intermediate vessel, and in that, for periods before tv and after tn, the regeneration off-gas stream is contacted with a second volume flow rate of the scrubbing medium and the scrubbing medium laden with the target component is stored at a second pressure in a second intermediate vessel.