Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1987-06-11
1989-03-28
Spitzer, Robert
Gas separation
Means within gas stream for conducting concentrate to collector
55 58, 55 62, 55 66, 55 68, 55 75, B01D 5304
Patent
active
048160393
ABSTRACT:
The inclusion of one or more tanks in a two-bed pressure swing adsorption system provides for a further reduction in the pressure from which each bed is vented. According to the invention, following a bed pressure equalization step, the bed which is to undergo regeneration is equalized with at least one tank, which is at a lower pressure, in order to transfer part of the gas located in the bed void volume. After the bed is regenerated, it is again equalized with the same tank, now at a higher pressure than the bed, in order to return the conserved gas. This process increases yield by decreasing the loss of gas attributable to bed void volume. The combination of the two-bed process with one or more pressure equalization tanks for conserving void gas for subsequent bed repressurization rather than use as purge gas is unique to the present invention. It is best applied to multicomponent gas mixtures, in which a moderately adsorbed component is distributed between a higher pressure primary product stream containing a mildly adsorbed component and a lower pressure secondary product or vent stream containing a strongly adsorbed component. The present process has been applied to increase the yield of argon which is separated from a mixture consisting of hydrogen, argon, nitrogen and methane.
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Krishnamurthy Ramachandran
Lerner Steve L.
Maclean Donald L.
Cassett Larry R.
Konkol Chris P.
Spitzer Robert
The BOC Group Inc.
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