Patent ID: 6572838
Filing Date: 2003-06-03
Classification: B01D,B01J,C01B,Y10S

Abstract:
A single stage process for the preparation of crystalline molecular sieve adsorbent by silver ion exchange, used for selectively adsorbing nitrogen and argon from a gaseous mixture containing oxygen, said process comprising the steps of:(a) mixing Zeolite A with an aqueous solution of silver salt; (b) refluxing the solution at 30-90Â° C. for 4-8 hours in dark to obtain a residue; (c) filtering and washing the residue with water till the residue is free from silver ions; and (d) drying below 85Â° C. in air followed by under reduced pressure to obtain the crystalline molecular sieve adsorbent having a chemical composition (Ag2O)x.(M2/nO)y.(Al2O3)6.(SiO2)12.wH2O.