| abstract |
A process for producing a high purity oxygen from air by PSA comprises connecting a first adsorption unit 15A, 15B packed with carbon molecular sieve and a second adsorption unit 17A, 17B packed with zeolite molecular sieve in series, and conducting PSA operation separately in each of the units during the same operation cycle time. The desorption gas from the first adsorption unit 15A, 15B is accumulated in a receiver 16 and then introduced to the second unit 17A, 17B as a raw material gas and to the first unit 15A, 15B as a rinse gas. |