METHOD OF PURIFYING A GAS STREAM CONTAMINATED BY CARBON DIOXIDE AND ONE OR MORE HYDROCARBONS AND/OR NITROGEN OXIDES BY ADSORPTION ON AN AGGREGATED ZEOLITIC ADSORBENT

摘要

Purifying a gas stream containing carbon dioxide and impurities (hydrocarbons and/or nitrogen oxides and optionally water) comprises contacting the gas stream with adsorbent granules to adsorb carbon dioxide and impurities, desorbing the impurities and regenerating the adsorbent. The adsorbent comprises either a sodium LSX zeolite or a mixture of at least 20 wt.% of a sodium X zeolite and up to 80 wt.% of a sodium LSX zeolite. Purifying a gas stream containing carbon dioxide and other impurities (hydrocarbons and/or nitrogen oxides and optionally water) comprises contacting the gas stream with adsorbent granules to adsorb carbon dioxide and impurities, desorbing the impurities and regenerating the adsorbent. The adsorbent comprises either at least 70 wt.% of a LSX zeolite in at least 90% sodium form, up to 5 wt.% inert binder and optionally up to 25 wt.% other zeolite(s) or at least 70 wt.% of a mixture of at least 20 wt.% of an X zeolite in at least 90% sodium form and up to 80 wt.% of a LSX zeolite in at least 90% sodium form, up to 5 wt.% inert binder and optionally up to 25 wt.% other zeolite(s).