Patent ID: 6408849
Filing Date: 2002-06-25
Classification: B01D,C01B,G01R,Y02C,Y02P

Abstract:
A method for recovery and purification of a gas used to enhance a medical process, which comprises:a. passing said gas to said medical process and therein using said gas for enhancement of said process, use in said process also causing gaseous or liquid contaminants including water vapor, carbon dioxide, oxygen or nitrogen, to become incorporated into said gas; b. collecting at least a portion of thus-contaminated gas; c. determining which said gaseous or liquid contaminants are contained in said gas; d. drying said contaminated gas to reduce said water concentration in said contaminated gas to not greater than 10 ppm, if said contaminated gas contains a water concentration; e. contacting said contaminated gas with a carbon dioxide absorbent to reduce said carbon dioxide concentration to not greater than 10 ppm, if said contaminated gas contains a carbon dioxide concentration; f. contacting said contaminated gas with an oxygen absorbent to reduce said oxygen concentration to not greater than 1 ppm, if said contaminated gas contains an oxygen concentration; g. contacting said contaminated gas with a nitrogen getter to reduce said nitrogen concentration to not greater than 1 ppm, if said contaminated gas contains a nitrogen concentration; h. reducing other non-noble gaseous contaminants to not greater than 10 ppm, if said contaminated gas contains said other non-noble gaseous contaminants; and i. collecting said gas after such decontamination for recycle to said medical process and subsequent reuse therein.