Device and method for removing water and carbon dioxide from a gas mixture using pressure swing adsorption
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United States of America Patent
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Nov 18, 2008
Grant Date -
Sep 15, 2005
app pub date -
Mar 10, 2005
filing date -
Mar 12, 2004
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Abstract
A pressure swing adsorption (PSA) dryer for separating water and carbon dioxide from a gas stream includes two compound adsorbent columns [32, 42]. Each column comprises a primary adsorption material for adsorbing water and a secondary adsorbent that adsorbs carbon dioxide. The secondary adsorbent comprises a solid amine. The secondary adsorbent may be, for example, a highly porous polystyrene matrix with amine groups bonded to the porous resin structure. Preferably, a mixture of the primary and secondary adsorbent materials forms an intermediate layer [38, 48] sandwiched between a top layer [34, 44] and bottom layer [36, 46] of pure water adsorbent material in each of the columns [32, 42].
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