EP0193716A2
Expired / Lapsed
EP
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Adsorptive separation of methane and carbon dioxide gas mixtures
Assignee: Air Products and Chemicals Inc
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Filing: 1986-01-17
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Granted: —
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Expires: 2006-01-17
Abstract
Abstract A process is described for separating gas mixtures containing a primary gaseous component and a secondary gaseous component by selective adsorption of the secondary gaseous component in an adsorptive process including the steps of adsorption in at least one adsorbent bed, rinsing said bed with secondary component, depressurizing and evacuating said bed without addition rinsing and repressurizing said bed with primary gaseous component. The process is particularly attractive for recovering carbon dioxide and methane from landfill gas.
Inventors
- 👤 Shivaji Sircar
- 👤 William Rohrer Koch
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 13:52
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/12; C07C7/13; B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/047; B01D53/0476; C01; C01B; C01B3/00; C01B3/50; C01B3/56; C01B32/00; C01B32/50; B01D2253/00; B01D2253/10; B01D2253/102; B01D2253/106; B01D2253/108; B01D2253/25; B01D2256/00; B01D2256/16; B01D2256/22; B01D2256/24; B01D2256/245; B01D2257/00; B01D2257/50; B01D2257/504; B01D2259/00; B01D2259/40; B01D2259/40011; B01D2259/40028; B01D2259/4003; B01D2259/40032; B01D2259/40058; B01D2259/40064; B01D2259/40066; B01D2259/404; B01D2259/406; B01D2259/4061; B01D2259/4062; C01B2203/00; C01B2203/04; C01B2203/042; C01B2203/043; C01B2203/0465; C01B2203/0475; Y; Y02; Y02C; Y02C20/00; Y02C20/40; Y02E; Y02E50/00; Y02E50/30; Y02P; Y02P20/00; Y02P20/151
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
190 words
A process for the adsorptive separation of a gas mixture containing at least a primary gaseous component and a secondary gaseous component in which each component is recovered at high recovery and high purity in a plurality of adsorption beds which are preferentially selective to the adsorption of the secondary component, comprising the steps of: (a) passing a feed gas mixture into one of the plurality of adsorption beds wherein primary component passes through the bed as a pure product and secondary component is selectively adsorbed on the adsorbent; (b) discontinuing adsorption and rinsing the adsorption bed with a stream of secondary component to remove any primary component as an effluent which is recycled to the feed to the process; (c) depressurizing the rinsed adsorption bed to an intermediate pressure countercurrent to said adsorption to at least partially remove the secondary component from said adsorption bed; (d) following said depressurization of step (c) and without further rinsing, evacuating said adsorption bed countercurrently to a subatmospheric pressure to further remove secondary component from said bed; and (e) repressurizing the bed to superatmospheric pressure to prepare the bed for another adsorption step.
Claim 2
Dependent Claim
190 words
A process for the adsorptive separation of a gas mixture containing at least a primary gaseous component and a secondary gaseous component in which each component is recovered at high recovery and high purity in a plurality of adsorption beds which are preferentially selective to the adsorption of the secondary component, comprising the steps of: (a) passing a feed gas mixture into one of the plurality of adsorption beds wherein primary component passes through the bed as a pure product and secondary component is selectively adsorbed on the adsorbent; (b) discontinuing adsorption and rinsing the adsorption bed with a stream of secondary component to remove any primary component as an effluent which is recycled to the feed to the process; (c) depressurizing the rinsed adsorption bed to an intermediate pressure countercurrent to said adsorption to at least partially remove the secondary component from said adsorption bed; (d) following said depressurization of step (c) and without further rinsing, evacuating said adsorption bed countercurrently to a subatmospheric pressure to further remove secondary component from said bed; and (e) repressurizing the bed to superatmospheric pressure to prepare the bed for another adsorption step.
Claim 3
Dependent Claim
22 words
The process of Claim 1 wherein the gas mixture comprises methane as a primary component and carbon dioxide as a secondary component.
Claim 4
Dependent Claim
17 words
The process of Claim 1 wherein the separation is performed in four adsorption beds connected in parallel.
Claim 5
Dependent Claim
16 words
The process of Claim'1 wherein the separation is performed in five adsorption beds connected in parallel.
Claim 6
Dependent Claim
17 words
The process of Claim 1 wherein the separation is performed in six adsorption beds connected in parallel.
Claim 7
Dependent Claim
17 words
The process of Claim 1 wherein the recovery of primary and secondary component is 95% or above.
Claim 8
Dependent Claim
14 words
The process of Claim 1 wherein the adsorbent is a synthetic or natural zeolite.
Claim 9
Dependent Claim
13 words
The process of Claim 1 wherein the feed gas mixture is landfill gas.
Claim 10
Dependent Claim
27 words
The process of Claim 1 wherein the feed gas mixture is steam reformer off-gas containing hydrogen as a primary component and carbon dioxide as a secondary component.
Claim 11
Dependent Claim
26 words
The process of Claim 1 wherein the feed gas mixture is production gas from an oil field produced by an oxygen fireflood or carbon dioxide flood.
Claim 12
Dependent Claim
14 words
The process of Claim 1 wherein the feed gas mixture is at 50-500 psig.
Claim 13
Dependent Claim
18 words
The process of Claim 1 wherein the feed gas mixture is pretreated to remove water and heavy hydrocarbons.
Claim 14
Dependent Claim
20 words
The process of Claim 1 wherein the rinse of step (b) is preformed cocurrently to the adsorption of step (a).
Claim 15
Dependent Claim
20 words
The process of Claim 1 wherein the repressurization of step (e) is performed countercurrently to the adsorption of step (a).
Claim 16
Dependent Claim
27 words
The process of Claim 1 wherein a portion of the secondary component evolved in steps (c) and (d) is used as the rinse gas of step (b).
Claim 17
Dependent Claim
25 words
The process of Claim 1 wherein a portion of the secondary component evolved in step (d) is used as the rinse gas in step (b).
Claim 18
Dependent Claim
15 words
The process of Claim 1 wherein step (c) is performed in at least two stages.
Claim 19
Dependent Claim
12 words
The process of Claim 1 wherein the adsorbent is an activated carbon.
Claim 20
Dependent Claim
17 words
The process of Claim 1 wherein the adsorbent is the sodium exchanged form of the X zeolite.
Claim 21
Dependent Claim
16 words
The process of Claim 1 wherein the intermediate pressure of step (c) is approximately atmospheric pressure.
Claim 22
Dependent Claim
23 words
The process of Claim 17 wherein the secondary component from the first stage of depressurization is used for the rinse of step (b).
References Cited (Backward Citations)
No citation records indexed.
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