Shivaji Sircar, Roger R Conrad, William J Ambs: Binary ion exchanged type X zeolite adsorbent. Air Products and Chemicals, Mark L Rodgers, E Eugene Innis, James C Simmons, December 10, 1985: US04557736 (42 worldwide citation)

The present invention involves an improved adsorbent for gas separation processes. The adsorbent comprises a binary ion exchanged Type X zeolite wherein between 5% and 40% of the available ion sites are occupied by Ca, and between 60% and 95% of the available ion sites are occupied by Sr. The presen ...

Shivaji Sircar, Roger R Conrad, William R Koch: Closed-loop thermal regeneration of adsorbents containing reactive adsorbates. Air Products and Chemicals, John M Fernbacher, James C Simmons, November 20, 1990: US04971606 (20 worldwide citation)

A method is disclosed for the thermal regeneration of an adsorbent which contains adsorbed components which can react with and damage the adsorbent at regeneration temperatures. The method comprises passing a hot regeneration gas through a bed of the adsorbent at a sufficiently high flow rate such t ...

Shivaji Sircar, William J Ambs, Roger R Conrad: Gas separation kinetics in commercial pellets. Air Products and Chemicals, Geoffrey L Chase, E Eugene Innis, James C Simmons, July 16, 1985: US04529416 (12 worldwide citation)

To improve the column dynamics of commercial pelleted sodium aluminosilicate zeolite adsorbents used in gas separation, the pellets are treated by washing in dilute aqueous mineral acid. The treatment is most effective as applied to sodium mordenite pellets, employing hydrochloric acid of about 0.1 ...

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