PURPOSE: To separate efficiently N
2 and O
2 from a gaseous mixture under the condition of low temp. and low pressure by using at least two adsorbing towers packed with a mineralozical name, sodium faujasite represented by Na-X.
CONSTITUTION: Air compressed to 1.05W3 ata by a compressor 2 is introduced to an adsorbing tower 8 via a passage 6. N
2 in the compressed air is removed by a N
2 adsorbent 9 and the oxygen concentration is increased as the air is sent to the latter part of the tower. Later the compressed air is recovered as a product O
2 via a product O
2 tank 13. Since said tower 8' is evacuated by a vacuum pump 18 connected thereto, and N
2 adsorbed by the adsorbent 9' in the adsorbing tower 8' is desorbed easily by a part of the product O
2 , the adsorbent is regenerated for a short time. When the adsorbent 9 in said tower 8 is saturated, and regeneration is ended by desorption of N
2 from N
2 adsorbent in said tower 8, the flow passage 6 of entering air is switched to another passage 6'. By repeating alternately above-mentioned method, the product O
2 can be recovered continuously.
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