초록 ▼

A process, particularly of the TSA type, for separating impurities of the nitrogen protoxide (N.sub.2 O) and possibly carbon dioxide (CO.sub.2) or ethylene (C.sub.2 H.sub.4) type which are contained in a gas stream, such as air. The impurities of nitrogen protoxide type are removed on a faujasite ze

A process, particularly of the TSA type, for separating impurities of the nitrogen protoxide (N.sub.2 O) and possibly carbon dioxide (CO.sub.2) or ethylene (C.sub.2 H.sub.4) type which are contained in a gas stream, such as air. The impurities of nitrogen protoxide type are removed on a faujasite zeolite having a Si/Al ratio of 1 to 1.5 and containing from 0 to 35% of K.sup.+ cations, between 1 and 99% of Na.sup.+ cations and between 1 and 99% of Ca.sup.2+ cations, preferably at least 50% of Ca.sup.2+ cations. The separation is preferably carried out at a temperature of approximately -40.degree. C. to +80.degree. C., preferably at room temperature. Advantageously, the process is employed for prepurifying atmospheric air before cryogenic distillation of the air thus prepurified.

대표청구항 ▼

[ What is claimed is:] [1.]1. Process for separating at least nitrogen protoxide (N.sub.2 O) contained in a gas stream, which comprises: adsorbing at least some of said nitrogen protoxide on at least one adsorbent comprising at least one faujasite zeolite having a Si/Al ratio of about 1 to about 1.5

[ What is claimed is:] [1.]1. Process for separating at least nitrogen protoxide (N.sub.2 O) contained in a gas stream, which comprises: adsorbing at least some of said nitrogen protoxide on at least one adsorbent comprising at least one faujasite zeolite having a Si/Al ratio of about 1 to about 1.50 and containing less than 12% of K.sup.+ cations, Na.sup.+ cations and between 50% and 99% of Ca.sup.+2.