| 摘要 |
Multi-column pressure swing adsorption process for simultaneous production of ammonia synthesis gas and carbon dioxide from a reformer off gas having hydrogen, nitrogen and carbon dioxide as major components accompanied by minor quantities of methane, carbon monoxide and argon as impurities. The PSA system features two groups of adsorbent columns in which CO2 is adsorbed in adsorbers of the first group, the essentially CO2-freed effluent being charged to an adsorber of the second group for removal of minor impurities while discharging an effluent gas having an H2/N2 content stoichiometric for NH3 synthesis. The CO2 recovered from the first group of adsorbers is available at a high purity for reaction with the ammonia product for production of urea. |
