Praxair Technology, Inc.

Himanshu Saxena

Mark William Ackley

Jeffert John Nowobilski

John Fredric Billingham

Philip Alexander Barrett

Gregory William Henzler

This invention comprises an adsorption process for the removal of at least NO from a feed gas stream that also contains nitrogen and possibly COand water. In the process the feed stream is passed over adsorbents to remove impurities such as CO2 and water, then over an additional adsorbent having a high NO/Nseparation factor. In a preferred mode the invention is an air prepurification process for the removal of impurities from air prior to cryogenic separation of air. An apparatus for operating the process is also disclosed.

Method and apparatus for gas purification

Trace amounts of carbon monoxide and optionally hydrogen are removed from gaseous feed streams by passing the feed stream through a carbon monoxide adsorbent () prior to passing it through a supported metal catalyst (). The invention saves significant capital and operational costs over existing processes.

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Columbus, OH, United States of America

Himanshu Saxena