N2-ADSORBENT AND O2/N2 SEPARATION USING THE SAME

摘要

PURPOSE:To easily obtain a product O2 in reduced power consumption, by perforing adsorption and regeneration under cooling by using an N2-adsorbent prepared by applying heat treatment to sodium faujasite having an alumina sol adhered thereto. CONSTITUTION:1wt% or more of an alumina sol is added to sodium faujasite represented by Na-X or Na-Y and the resulting mixture is subjected to heat treatment at 450 deg.C or more to form a low temp. N2-adsorbent which is, in turn, allowed to pack two or more of adsorbing towers 8, 8'. 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 to adsorb N2 with the N2-adsorbent 9 while high purity O2 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 ata to regenerate the 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.