Gas separation by pressure swing adsorption
First Claim
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1. A method for gas separation of adsorbable components from less adsorbable components on fixed adsorbent beds, comprising the steps of:
- (a) flowing a feed gas mixture under adsorption pressure to an adsorbent bed to selectively adsorb components from said feed gas onto the adsorbent bed, said bed having a feed end and a product end; and
(b) displacing said feed gas with a gas having a higher concentration of adsorbable components, whereby less adsorbable components are displaced from a portion of the bed; and
(c) depressurizing the bed by taking out gas simultaneously from at least two different locations of the bed to recover essentially pure less adsorbable components at the product end of the bed and to recover the adsorbable components from at least one of the different locations; and
(d) pressurizing the bed.
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Abstract
A pressure swing adsorption process is disclosed wherein binary gas purification is effected from a single adsorbent bed. An adsorbent bed is charged under pressure with a gas mixture having some components that are more adsorbable than others. The process causes the bed to be polarized with one end of the bed containing the more adsorbable components and the other end containing the less adsorbable components. Once charged, the bed is depressurized simultaneously from both ends, thus removing the separated components from their respective ends.
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Citations
36 Claims
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1. A method for gas separation of adsorbable components from less adsorbable components on fixed adsorbent beds, comprising the steps of:
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(a) flowing a feed gas mixture under adsorption pressure to an adsorbent bed to selectively adsorb components from said feed gas onto the adsorbent bed, said bed having a feed end and a product end; and (b) displacing said feed gas with a gas having a higher concentration of adsorbable components, whereby less adsorbable components are displaced from a portion of the bed; and (c) depressurizing the bed by taking out gas simultaneously from at least two different locations of the bed to recover essentially pure less adsorbable components at the product end of the bed and to recover the adsorbable components from at least one of the different locations; and (d) pressurizing the bed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method for gas purification, comprising the steps of:
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(a) flowing a feed gas mixture current under pressure through a fixed adsorbent bed, said mixture flowing firstly through a feed end, secondly through said bed, and thirdly out through a product end, said mixture comprising at least two components wherein a first component is more adsorbable than a second component, said first component being selectively adsorbed onto said bed; and (b) displacing said mixture with a gas having a higher concentration of said first component, whereby said second component is displaced from said feed end; and (c) depressurizing both of said ends simultaneously by lowering said pressure, whereby said first component is recovered from said feed end in a substantially pure state and said second component is recovered from said product end in a substantially pure state. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification