Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1980-06-13
1982-05-11
Spitzer, Robert H.
Gas separation
Means within gas stream for conducting concentrate to collector
55 33, 55 62, 55 68, 55 75, B01D 5304
Patent
active
043291589
ABSTRACT:
Improved oxygen recovery in the operation of a pressure swing adsorption system for air fractionation is obtained by passng the air, freed of water and CO.sub.2, through an adsorbent bed maintained at elevated temperature throughout the cycle and which is selective for retention of nitrogen, and consequent withdrawal of an oxygen-rich primary effluent product. In a preferred embodiment ambient air is passed through a pretreater section providing an adsorbent bed for removal of water and carbon dioxide. The thus purified air is compressed with consequent rise in temperature and then only partly cooled down by exchange with cooler desorbed and purged nitrogen-rich gas products withdrawn from the main adsorbent beds. These nitrogen-rich products thus heated by the exchange are employed in regenerating a water and carbon dioxide laden bed of the pretreater section. While the adsorption-desorption is operated in a pressure swing cycle, the pretreater section is operated in an independent thermal swing cycle. Alternatively, the feed air may be compressed prior to its introduction into the pretreater and the thus generated heat utilized by heat exchange for heating the purified air effluent to be fractionated.
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Air Products and Chemicals Inc.
Innis E. Eugene
Ryder Thomas G.
Simmons James C.
Spitzer Robert H.
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