초록 ▼

Process for separating at least carbon dioxide (CO.sub.2) 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.sup.+ cations, between 1 and 99% of Na.sup.+ cations and at

Process for separating at least carbon dioxide (CO.sub.2) 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.sup.+ cations, between 1 and 99% of Na.sup.+ cations and at most 99% of Ca.sup.2+ cations. This process is carried out at a temperature ranging from -40.degree. C. to +80.degree. 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.

대표청구항 ▼

[ What is claimed is:] [1.]1. Process for separating at least water vapor, carbon dioxide (CO.sub.2) and ethylene (C.sub.2 H.sub.4) contained in an air stream, which comprises the sequential steps of:removing water vapor from said air stream; andcontacting said air stream with a zeolite-X having a S

[ What is claimed is:] [1.]1. Process for separating at least water vapor, carbon dioxide (CO.sub.2) and ethylene (C.sub.2 H.sub.4) contained in an air stream, which comprises the sequential steps of:removing water vapor from said air stream; andcontacting 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.sup.+ cations, between about 4 and 99% of Na.sup.+ cations and from 30% to 96% Ca.sup.+2 cations, so as to adsorb at least carbon dioxide and ethylene and obtain a purified air.