Air Products and Chemicals, Inc.

Edwin John Miller

Rodney John Allam

Vincent White

Roger Dean Whitley

Douglas Paul Dee

Robert Ling Chiang

SOand/or NOare removed from gaseous COat elevated pressure(s) in the presence of molecular oxygen and water and, when SOis to be removed, NO, to convert SOto sulfuric acid and/or NOto nitric acid. The sulfuric acid and/or nitric acid is/are then removed from the gaseous carbon dioxide to produce SO-free, NO-lean carbon dioxide gas. The invention has particular application in the removal of SOand/or NOfrom carbon dioxide flue gas produced in an oxyfuel combustion process, for example, in a pulverized coal fired power station.

Purification of carbon dioxide

Pressure swing adsorption process for the recovery of high purity oxygen from a feed gas comprising oxygen, nitrogen, and argon. The process includes a forward flow stage which comprises (a) passing the feed gas into a first adsorption zone containing an adsorbent selective for the adsorption of nitrogen over oxygen and argon, and withdrawing therefrom a nitrogen-depleted intermediate gas; (b) passing the nitrogen-depleted intermediate gas into a second adsorption zone containing an adsorbent which is selective for the adsorption of nitrogen over argon and selective for the adsorption of argon over oxygen; (c) withdrawing an oxygen-enriched product gas from the second adsorption zone; and (d) terminating the passing of feed gas into the first adsorption zone and withdrawing an oxygen-enriched depressurization gas from the second adsorption zone in the same flow direction as (c). During (a) or during (d), nitrogen breakthrough from the first adsorption zone can occur and nitrogen can be adsorbed in the second adsorption zone.

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Allentown, PA, United States of America

Edwin John Miller