Patent ID: 8221526

Claim:
A process for the purification or separation of a feed gas stream containing at least one impurity, comprising: a) said feed gas stream is brought into contact with a first adsorbent for eliminating at least said impurity by adsorption, thereby producing a purified gas; b) said purified gas is recovered; c) a regeneration gas containing at least hydrogen and carbon monoxide is heated by means of a heater, I. said heater having a heat exchange surface, and said heat exchange surface having a skin temperature (T 1 ) defined as the temperature of the heat exchange surface that is in contact with the gas, II. said skin temperature is between 150° C. and 200° C. during the gas heating phase; and d) the adsorbent of step a) is periodically regenerated with the regeneration gas heated in step c) at a regeneration temperature (T 2 ) such that: T 2 =T 1 −ΔT where the temperature difference (ΔT) is 5° C.<ΔT <50° C.