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Zero grade air generating system

Image Number 2 for United States Patent #6071481.

A zero air generating system comprises a hydrocarbon and NO oxidizer and a molecular sieve unit which are interconnected by suitable lines for continuous processing of the air stream. Flow control means is provided to maintain the flow rate of the air being treated to 5 liters/minute or less. The system may also include a separate NO to NO.sub.2 converter. The system purifies shop air by reducing the concentration of contaminants such as NO.sub.2, CO, CO.sub.2, H.sub.2 O and other remaining unoxidized hydrocarbons to levels acceptable under the IM-240 specification for instrument air. In a preferred embodiment of the invention, two parallel connected molecular sieves units are utilized in the system. Thus the air being treated can alternately flow through one molecular sieve while the other unit is in the process of being regenerated.

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