Patent ID: 6221323
Filing Date: 2001-04-24
Classification: F24F,Y02C

Abstract:
A method of producing super clean air from atmospheric air containing chemical components in addition to nitrogen, oxygen, and noble gases, said method comprising pre-treating the atmospheric air to remove carbon dioxide and moisture, treating the atmospheric air with an adsorbent at a treatment temperature in the range of from -40.degree. C. to -180.degree. C. to adsorb and remove the additional chemical components, other than nitrogen, oxygen, and noble gases, from the atmospheric air, to obtain super clean air,wherein said chemical components are present in a plurality of chemical component groups, each group including chemical components having respective solidification temperatures close to each other and falling within a solidification temperature range for the group, the adsorption treatment step being divided into a number of adsorption steps equal to the number of chemical component groups, the treatment temperature range for the group so that, by starting with an adsorption step having a highest treatment temperature and carrying out the adsorption steps at successively lower treatment temperatures until the treatment step having the lowest treatment temperature has been completed, the chemical components are adsorbed as a gas and removed group by group starting with a group having a highest solidification temperature range and ending with a group having a lowest solidification temperature range.