Patent ID: 8337593

Claim:
A process for purifying a natural gas by using first and second adsorbers, comprising: A) passing a feed comprising the natural gas through the first adsorber to obtain a purified natural gas product; B) regenerating the second adsorber in a heating stage, wherein the heating stage comprises: 1) separating a portion of the feed comprised in a regeneration gas; 2) passing the regeneration gas to a dryer for removing water; 3) heating the regeneration gas with a heater after exiting the dryer; and 4) passing the regeneration gas to the second adsorber to regenerate the second adsorber; and C) regenerating the second adsorber in a cooling stage, wherein the cooling stage comprises: 1) expelling at initiation of cooling at least a part of a fluid present in the second adsorber to the dryer to desorb water from an adsorbent in the dryer; and 2) cooling the second adsorber by circulating the regeneration gas bypassing the heater.