Single stage secondary high purity oxygen concentrator

Abstract

A single stage secondary oxygen concentrator for receiving a gas mixture from a first stage oxygen concentrator and a method of use therefor is disclosed. The concentrator includes a first carbon molecular sieve bed and a second carbon molecular sieve bed. A first inlet valve is connected to an inlet of the first carbon molecular sieve bed and a second inlet valve is connected to the inlet of the second carbon molecular sieve bed. A first product outlet valve is connected to the outlet of the first carbon molecular sieve bed and a second product outlet valve is connected to the product outlet of the carbon molecular sieve bed. The oxygen concentrator has control means for controlling a first cycle in which the first carbon molecular sieve bed is being charged with the gas mixture and the second carbon molecular sieve bed is being desorbed. During the first cycle, the first inlet valve is in the open position, allowing the gas mixture to flow into the carbon molecular sieve bed and the first product outlet valve is in the closed position as the gas mixture flows through first carbon molecular sieve bed and oxygen is selectively adsorbed from the gas mixture. The second inlet valve is in the closed position and the second product outlet valve is open allowing a first high purity oxygen product to flow from the second carbon molecular sieve bed.