Patent ID: 6824588
Filing Date: 2004-11-30
Classification: B01D,F25J,Y02C

Abstract:
An apparatus for purifying air used as a raw material in cryogenic air separation that separates nitrogen and oxygen mainly by distilling the air at low temperatures, comprising:an adsorber comprising an adsorption cylinder that comprises a first adsorbing layer and a second adsorbing layer, wherein the first adsorbing layer comprises a first adsorbent capable of selectively adsorbing water in the air and the second adsorbing layer comprises a second adsorbent capable of selectively adsorbing nitrogen oxides and/or hydrocarbons in the air passing the first adsorbing layer, wherein the second adsorbent comprises an X zeolite containing magnesium ion as an ion-exchangeable cation, and a magnesium-exchange ratio in total cations of the X zeolite is higher than 40%, wherein the second adsorbent contains merely a trace of A zeolite as an impurity.