| 摘要 |
An improved process for the oxygen enrichment of air by vacuum swing adsorption, pressure swing adsorption or a combination thereof, wherein the improvement comprises providing at least one packing at each of the air inlet to and air outlet from the adsorber, the packing at the air inlet side of the adsorber comprising Na-Ca zeolite X with an SiO2/Al2O3 ratio of 2.0 to 2.5 and with a CaO/Al2O3 ratio of 0.4 to 0.75, the ratio being dependent upon the air inlet temperature, at an air inlet temperature of 20 DEG to 30 DEG C., the CaO/Al2O3 ratio of the Na-Ca zeolite X at the inlet zone being 0.4 to 0.6, at an air inlet temperature of 30 DEG to 40 DEG C., the CaO/Al2O3 ratio of the Ca zeolite X at the inlet zone being 0.55 to 0.65 and at an air inlet temperature of 40 DEG to 50 DEG C., the CaO/Al2O3 ratio of the Na-Ca zeolite X at the inlet zone being 0.6 to 0.75, the packing at the air outlet side of the adsorber comprising Na-Ca zeolite A with a CaO/Al2O3 ratio of 0.5 to 1.0 or Na-Ca zeolite X with CaO/Al2O3 ratio of 0.4 to 1.0, above the CaO/Al2O3 ratio of the Na-Ca zeolite X at the inlet side.
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