Patent ID: 6074459
Filing Date: 2000-06-13
Classification: B01D

Abstract:
A process for removing contaminants from a gas stream comprising passing said gas stream through sequential beds of adsorbents, where:a) a first adsorbent bed of said sequential beds of adsorbents comprises one or more adsorbents having a strong affinity for water so as to remove water from the gas stream;b) a second adsorbent bed of said sequential beds of adsorbents comprises one or more silver-exchanged molecular sieves having a FAU structure and having a strong affinity for sulfur-containing compounds generally to selectively remove sulfur-containing compounds from the gas stream;c) a third adsorbent bed of said sequential beds of adsorbents comprises one or more molecular sieves having a strong affinity for sulfur compounds containing S.dbd.C, S.dbd.O, and S--C functionalities selected from the group consisting of molecular sieves having an MFI structure with a Si:Al ratio of at least 10, ZSM-12, and ZSM-23; andd) a fourth adsorbent bed of said sequential beds of adsorbents comprises alumina with adsorption capacity for sulfur-containing compounds and halocarbons.