Patent ID: 6226888
Filing Date: 2001-05-08
Classification: B01D

Abstract:
A method for drying a gas by means of adsorption on a desiccant able to be regenerated, according to which method a gas is sent through a first amount of this desiccant, while a portion of the dried gas is sent through a second amount of already used desiccant for regenerating it, this gas portion for the regeneration being heated and after having taken up moisture is evacuated, whereby, after regenerating the second amount of desiccant, the gas flow is inverted so that the gas to be dried is sent through the regenerated second amount of desiccant, while a portion of the dried gas is now sent through the first amount for regenerating, in which the gas portion used for the regeneration is heated in at least two successive steps, said steps being performed in different zones situated successively in the flow direction of the gas portion through the regenerating desiccant and by stopping the heating in one of said zones as soon as the desiccant in this zone is regenerated, so that this zone may already cool down by the gas portion for regeneration while a successive of said zones is still regenerated by the heated gas.