Air purification process
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United States of America Patent
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-
May 29, 2001
Grant Date -
N/A
app pub date -
Mar 26, 1999
filing date -
Sep 26, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Substantially all of the carbon dioxide is removed from a gas containing up to about 1% by volume carbon dioxide by subjecting the gas to a pressure swing adsorption process using a two layer adsorption system, wherein the first layer contains activated alumina and the second layer is a zeolite or a combination of zeolites having a silicon to aluminum atomic ratio of at least 1.5. The process is particularly suitable for removing substantially all carbon dioxide and water vapor contained in air prior to subjecting the air to cryogenic distillation.
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