Process for the preparation of molecular sieve adsorbent for selective adsorption of nitrogen and argon
AssigneeCouncil of Scientific and Industrial Research
InventorsJince Sebastian, Raksh Vir Jasra
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Abstract
The present invention relates to the manufacture of novel molecular sieve adsorbents for the separation of a gaseous mixture of oxygen, nitrogen and argon. The adsorbent is useful for the separation of oxygen and/or nitrogen from air. More specifically, the invention relates to the manufacture of a molecular sieve adsorbent, which is selective towards nitrogen from its gaseous mixture with oxygen and/or argon and argon from its gaseous mixture with oxygen.
Claims18
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 30-90° 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 85° 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.
Dependencies are inferred from the claim text.