| 摘要 |
<p>PURPOSE:To produce O2 with inexpensive adsorbents by packing the upper stream side of an adsorption tower with Ca-Na-A type zeolite and the downstream side with Na-X type zeolite treated with an aqueous NaCl soln. so as to reduce the consumption unit of power required and the amount of the adsorbents required. CONSTITUTION:A gaseous mixture contg. O2 and N2 as principal components is introduced into an N2 adsorption tower at a temp. below room temp. under atmospheric pressure -3atm. N2 is selectively adsorbed in the tower, high purity O2 or O2 enriched gas is discharged, and the tower contg. the adsorbed N2 is evacuated to 0.04-0.55atm. to carry out regeneration. In this method, the upper stream side of the tower where the concn. of O2 does not exceed 50% is packed with Ca-Na-A type zeolite, and the downstream side is packed with Na-X type zeolite treated with an aqueous NaCl soln. by dipping. The Ca-Na-A type zeolite adsorbs a larger amount of N2 than the Na-X type zeolite by about 20% in the region where the concn. of O2 does not exceeds 50% while maintaining N2 selectivity comparable to that of the Na-X type zeolite, so O2 is produced with the N2 adsorbents adsorbing a large amount of N2 and maintaining high N2 selectivity as a whole in the N2 adsorption tower.</p> |
