Refrigeration – Cryogenic treatment of gas or gas mixture – Automatic control
Patent
1998-10-09
2000-06-13
Doerrler, William
Refrigeration
Cryogenic treatment of gas or gas mixture
Automatic control
62644, F25J 304
Patent
active
060734639
ABSTRACT:
The present invention concerns a cryogenic air separation process which intermittently diverts a portion of the air feed as repressurization gas for a front-end two bed pressure swing adsorption adsorption system which system is used to remove impurities from the air feed. In particular, the present invention is an improvement to said process for at least partially eliminating reductions in the purity of the product streams from the air separation unit caused by the intermittent diversions of the air feed as repressurization gas. The improvement comprises reducing the flow of both the nitrogen-enriched waste stream and the crude liquid oxygen stream from the air separation unit during those intermittent periods when repressurization gas is required in the pressure swing adsorption system.
REFERENCES:
patent: 4251248 (1981-02-01), Iyoki et al.
patent: 5406800 (1995-04-01), Bonaquist
patent: 5560763 (1996-10-01), Kumar
Megan, et al. of Praxair, Inc. "Dynamic Study of Air Flow Disturbances on a Cryogenic Air Separation Plant" 1995 AICHE.
Air Products and Chemicals Inc.
Doerrler William
Wolff Robert J.
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