N2-ADSORBENT AND O2/N2 SEPARATION USING SAME

摘要

PURPOSE:To easily obtain a product O2 in reduced power consumption, by performing adsorption and regeneration under cooling by using an N2-adsorbent prepared by immersing sodium faujasite in a saline solution. CONSTITUTION:Two or more of adsorbing towers 8, 8' are packed with a low temp. N2-adsorbent obtained by immersing sodium faujasite represented by Na-X or Na-Y in a 5wt% or more saline solution under such a condition that the ratio of saline solution/adsorbent is 3 or more. Compressed, dehumidified and purified air is sent to the adsorbing tower 8 at pressure ranging from atmospheric pressure to 3 ata through flowlines 3', 6. N2 is adsorbed with the N2-adsorbent 9 and high purity or O2-enriched air is recovered as a product through a tank 13. A part of this O2 is sent to the adsorbing tower 8' through a pressure reducing valve 15 and the internal pressure of the tower 8' is reduced to 0.5-0.08 are to regenerate the N2-adsorbent 9'. After regeneration, the air flowline 6 is changed over to an air flowline 6'. In addition, a freezer 20 is provided to the flowline 3' and the adsorbing towers 8, 8' are set to a cooling condition equal to or less than a room temp.