METHODS AND SYSTEMS FOR SELECTIVELY SEPARATING CO2 FROM A MULTI-COMPONENT GASEOUS STREAM
First Claim
1. A method for removing CO2 from a multi-component gaseous stream to produce a CO2 depleted gaseous stream, said method comprising:
- (a) contacting a multi-component gaseous stream with an aqueous fluid in a first step hydrate reactor under first hydrate-formation reaction conditions sufficient to produce a mixture comprising a CO2 hydrate slurry and a gaseous stream depleted in CO2;
(b) transferring said mixture directly from said first step hydrate reactor to a second step hydrate reactor;
(c) exposing said mixture in said second step hydrate reactor to second hydrate-formation reaction conditions sufficient to produce CO2 hydrate slurry and a gaseous stream further-depleted in CO2; and
(d) separating said gaseous stream further-depleted in CO2 from said CO2 hydrate slurry to remove CO2 from said multi-component gaseous stream.
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Abstract
The present invention provides for methods for selectively removing CO2 from a multi-component gaseous stream to provide a CO2 depleted gaseous stream. In practicing the subject methods, an initial multi-component gaseous stream is contacted with an aqueous fluid under high-pressure CO2 hydrate-formation reaction conditions to produce a mixture of a CO2 hydrate slurry and a CO2 depleted gaseous stream. Aspects of the subject methods is that the mixture of the CO2 hydrate slurry and the CO2 depleted gaseous stream is transferred directly to a second step hydrate formation reactor in a one-stage, two-step process for further removal of CO2. Also provided are systems that find use in practicing the subject methods. The subject methods and systems find use in a variety of applications where it is desired to selectively remove CO2 from a multi-component gaseous stream.
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Citations
31 Claims
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1. A method for removing CO2 from a multi-component gaseous stream to produce a CO2 depleted gaseous stream, said method comprising:
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(a) contacting a multi-component gaseous stream with an aqueous fluid in a first step hydrate reactor under first hydrate-formation reaction conditions sufficient to produce a mixture comprising a CO2 hydrate slurry and a gaseous stream depleted in CO2; (b) transferring said mixture directly from said first step hydrate reactor to a second step hydrate reactor; (c) exposing said mixture in said second step hydrate reactor to second hydrate-formation reaction conditions sufficient to produce CO2 hydrate slurry and a gaseous stream further-depleted in CO2; and (d) separating said gaseous stream further-depleted in CO2 from said CO2 hydrate slurry to remove CO2 from said multi-component gaseous stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A system for removing CO2 from a multi-component gaseous stream to produce a CO2 depleted gaseous stream, said system comprising:
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(a) a first step hydrate formation reactor; (b) a second step hydrate formation reactor; and (c) at least two flash reactors arranged to produce CO2 gas from a CO2 hydrate slurry, wherein said first step hydrate formation reactor and said second step hydrate formation reactor are arranged in series, and wherein said first step hydrate formation reactor and said second step hydrate formation reactor are arranged to form a mixture comprising said CO2 hydrate slurry and a CO2 depleted gaseous stream from a multi-component gaseous stream, wherein said mixture flows directly from said first step hydrate formation reactor to said second step hydrate formation reactor. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification