Air prepurification for cryogenic air separation

Details Air prepurification for cryogenic air separation Air prepurification for cryogenic air separation

2006-06-30

2009-12-15

Hopkins, Robert A (Department: 1797)

Gas separation: processes

Compressing and indirect cooling of gaseous fluid mixture to...

And solid sorption

C095S096000, C095S148000, C096S130000, C062S643000, C062S644000, C062S646000

Reexamination Certificate

active

07632337

ABSTRACT:
The present invention relates to cryogenic air separation processes and systems that employ a pressure swing adsorption (PSA) prepurification process. It is advantageous to operate the PSA process at a pressure comparable to or below the operating pressure of the highest pressure column in the cryogenic separation unit. Following PSA prepurification, the air can be split into at least two fractions, with at least a portion of the air being directed to the cryogenic separation unit and at least a portion of the remaining air being further pressurized in at least one stage of compression.

REFERENCES:
patent: 4746343 (1988-05-01), Ishizu et al.
patent: 4964901 (1990-10-01), Rhode
patent: 5571309 (1996-11-01), Kumar
patent: 5661987 (1997-09-01), Zarate
patent: 5946942 (1999-09-01), Wong et al.
patent: 6536234 (2003-03-01), Shah

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