Process for purifying air by adsorption before cryogenic distillation
AssigneeL'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
InventorsCyrille Millet, Philippe Bourgeois, Georges Kraus, Jean-Pierre Gabillard
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Abstract
Process for separating at least carbon dioxide (CO2) contained in a gas stream, preferably air, in which at least carbon dioxide is adsorbed on a zeolite-X having a Si/Al ratio of approximately 1 to 1.5 and containing at most 35% of K+ cations, between 1 and 99% of Na+ cations and at most 99% of Ca2+ cations. This process is carried out at a temperature ranging from −40° C. to +80° C. Optionally, impurities chosen from water vapour and hydrocarbons, particularly ethylene, are also removed. The air thus purified is then capable of being cryogenically distilled.
Claims15
Process for separating at least water vapor, carbon dioxide (CO2) and ethylene (C2H4) contained in an air stream, which comprises the sequential steps of:
- removing water vapor from said air stream;
- and
- contacting said air stream with a zeolite-X having a Si/Al ratio ranging from 1 to 1.15, and containing at most 35% of K+ cations, between about 4 and 99% of Na+ cations and from 30% to 96% Ca+2 cations, so as to adsorb at least carbon dioxide and ethylene and obtain a purified air.
Process for separating at least water vapor, carbon dioxide (CO2) and ethylene (C2H4) contained in an air stream, which comprises the sequential steps of:
- removing water vapor from said air stream;
- and
- contacting said air stream with a zeolite-X having a Si/Al ratio ranging from 1 to 1.15, and containing from 0.01% to 35% of K+ cations, between about 4 and 99% of Na+ cations and at most 96% of Ca+2 cations so as to adsorb at least carbon dioxide and ethylene and obtain a purified air.
Dependencies are inferred from the claim text.