Preparation of high purity oxygen

Details Preparation of high purity oxygen Preparation of high purity oxygen

B - Operations, Transporting

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B01D 53/04 (2006.01) B01D 53/047 (2006.01) C01B 13/02 (2006.01)

Patent

CA 1304699

211-P-US03502 ABSTRACT OF THE DISCLOSURE An oxygen-rich gas product of at least about 95% O2 purity is obtained from ambient air in a single-stage pressure swing adsorption operation carried out in four steps, comprised of: (a) selective adsorp- tion of nitrogen from the air feed at superatmospheric pressure, (b) fol- lowed, without intermediate purge or rinse, by pressure let down through countercurrent gas withdrawal to about atmospheric level, (c) desorption by evacuation of the adsorbent bed to subatmospheric pressure level of 1/20 (5%) or less than 1/20th of the pressure prevailing during the ad- sorption step; and (d) repressuring the evacuated bed with part of the oxygen-rich effluent obtained during the adsorption step. Optionally, the operating cycle may include pressure equalization between two columns performed intermediate steps (a) and (b), whereby O2 recovery is in- creased. Under the prescribed conditions the oxygen production capacity at high purity level (~95%) is substantially increased.

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