Patent ID: 6120581
Filing Date: 2000-09-19
Classification: B01D

Abstract:
A process for the rejection of trace amounts of aromatic hydrocarbons from a waste gas feedstream comprising hydrogen sulfide, water, carbon dioxide, and said aromatic hydrocarbons, said process comprising:a) contacting the waste gas feedstream at effective conditions including an adsorption pressure in an adsorption zone containing a high silica zeolite adsorbent to adsorb at least a portion of said aromatic hydrocarbons and water to provide a treated effluent stream essentially free of the aromatic hydrocarbons;b) increasing the pressure in said adsorption zone to a desorption pressure and regenerating the high silica adsorbent with a heated regeneration gas stream at an effective desorption temperature to desorb the aromatic hydrocarbons; andc) depressurizing the adsorption zone to the adsorption pressure and repeating steps (a) and (b) to provide a continuous process.