Process for pre-purification of air for separation

Details Process for pre-purification of air for separation Process for pre-purification of air for separation

1990-03-29

1992-10-20

Chiesa, Richard L.

Gas separation

Means within gas stream for conducting concentrate to collector

55 33, 55 35, 62 18, B01D 5304

Patent

active

051566575

ABSTRACT:
There is disclosed an improved PSA process for the pre-purification of air to remove water vapor and carbon dioxide prior to introduction into an air separation unit. The subject process includes a step of efficiently regenerating the adsorptive beds utilized to remove the impurities wherein they are first vented to the atmosphere, then evacuated with atmospheric venting and finally purged under evacuation. Preferably, a pair of adsorptive beds operating out of phase undergo top and bottom pressure equalization prior to backfilling of the bed completing regeneration.

REFERENCES:
patent: 4636225 (1987-01-01), Klein et al.
patent: 4711645 (1987-12-01), Kumar
patent: 4756723 (1988-07-01), Sircar
Skarstrom, C. W.; Recent Developments In Separation Science, vol. 2, pp. 95-106, CRC Press, Cleveland, 1972.
K. B. Wilson, A. R. Smith and A. Theobald, "Air Purification for Cryogenic Air Separation Units", IOMA Broadcaster, Jan.-Feb., 1984.
M. Tomomura and S. Nogita, "Application of PSA to the Removal of Trace Components", Kagaku Kogaku Ronbunshu, vol. 13(5), pp. 548-553, 1987.

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