Adsorption-desorption pressure swing gas separation
AssigneeToray Industries, Inc.
InventorsKishio Miwa, Kazuo Tsunoi, Yoshio Noguchi
Life of this patent
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Abstract
Pressure swing selective adsorption-desorption process and apparatus for separating at least one gaseous component from a gas mixture. After selective adsorption from the gas mixture, the subsequent desorption procedure comprises two separate steps which are carried out under different pressures. The desorbed gases obtained by the two separate desorption steps are then combined.
Claims16
In a process for separating a selectively adsorbable gas component from a gas mixture by means of pressure swing adsorption technique which includes an adsorption step accompanied by pressure elevation and a desorption step accompanied by pressure reduction, in which adsorption columns are used which are packed with an adsorbent having capacity to adsorb said selectively adsorbable gas component, the improvement comprising:
- a. performing said desorption step in a first desorption step and a second desorption step separately in at least three adsorption columns simultaneously;
- b. recovering a first desorbed gas by pressure reduction from a region of relatively high pressure to a region of intermediate pressure;
- c. recovering a second desorbed gas from said desorption step by pressure reduction from a region of said intermediate pressure to a region of relative low pressure;
- d. combining said second desorbed gas with a portion or all of said first desorbed gas to produce a combined gas;
- and
- e. gradually increasing the flow rate of a portion or all of said first desorbed gas prior to being combined with said second desorbed gas whose flow rate is substantially uncontrolled and gradually decreased with pressure reduction so that said combined gas is caused to flow at a substantially constant rate.
Dependencies are inferred from the claim text.