Production of mixed gases of controlled composition by pressure swing adsorption
In the production of a binary gas mixture of desired fixed proportions of components from a starting feed gas containing such components, the method is described which comprises the steps of (a) passing the feed gas at superatmospheric pressure into a bed of solid adsorbent preferentially selective in retention of a first of the components, while discharging from the bed as primary effluent a stream consisting essentially of the unadsorbed or less selectively adsorbed second component; (b) while the bed is at about the aforesaid superatmospheric pressure, discontinuing the feed gas introduction and rinsing the bed, in a direction co-current to that of the feed gas introduction, with a gas stream rich in the preferentially retained first component; (c) withdrawing contained gas from the bed until the bed is depressurized to about a pressure level P and compressing at least a part of the gas so withdrawn to about superatmospheric level for use as rinsing gas in step (b); (d) while at about the pressure level of P, purging the bed with a controlled amount of the gas discharged as primary effluent during step (a); and (e) repressuring the bed to the initial superatmospheric pressure level of step (a) for repetition of the recited sequence of steps, the repressuring being effected with part of the primary effluent from step (a).
- Assignee:
- Air Products and Chemicals, Inc., Allentown, PA
- Patent Number(s):
- US 4705541
- OSTI ID:
- 5889813
- Country of Publication:
- United States
- Language:
- English
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