Methods and systems for selectively separating CO2 from a multicomponent gaseous stream
First Claim
1. A method for removing CO2 from a multicomponent gaseous stream to produce a CO2 depleted gaseous stream, said method comprising:
- (a) providing a multicomponent gaseous stream comprising a gaseous CO2 hydrate promoter;
(b) contacting said multicomponent gaseous stream with an aqueous fluid under conditions sufficient to produce CO2 hydrates, whereby CO2 is removed from said gaseous stream by said aqueous fluid and concomitantly fixed as CO2 clathrates upon said contacting to produce a CO2 depleted gaseous stream and a CO2 clathrate slurry; and
(c) separating said CO2 depleted gaseous stream from said CO2 clathrate slurry to remove CO2 from said multicomponent gaseous stream;
with the proviso that said method is further characterized by at least one of the following features;
(i) gaseous CO2 hydrate promoter produced from a recycled source is introduced into said multicomponent gaseous stream comprising said CO2 hydrate promoter at a time prior to said separating step (c); and
(ii) said contacting step (b) occurs in a finned tubular reactor.
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Abstract
Methods are provided for the selective removal of CO2 from a multicomponent gaseous stream to provide a CO2 depleted gaseous stream. In practicing the subject methods, an initial multicomponent gaseous stream that includes a gaseous CO2 hydrate promoter is contacted with an aqueous fluid, e.g., CO2 nucleated water, in a hydrate formation reactor under conditions of selective CO2 clathrate formation to produce a CO2 clathrate slurry and CO2 depleted gaseous stream. 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 multicomponent gaseous stream.
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Citations
20 Claims
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1. A method for removing CO2 from a multicomponent gaseous stream to produce a CO2 depleted gaseous stream, said method comprising:
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(a) providing a multicomponent gaseous stream comprising a gaseous CO2 hydrate promoter;
(b) contacting said multicomponent gaseous stream with an aqueous fluid under conditions sufficient to produce CO2 hydrates, whereby CO2 is removed from said gaseous stream by said aqueous fluid and concomitantly fixed as CO2 clathrates upon said contacting to produce a CO2 depleted gaseous stream and a CO2 clathrate slurry; and
(c) separating said CO2 depleted gaseous stream from said CO2 clathrate slurry to remove CO2 from said multicomponent gaseous stream;
with the proviso that said method is further characterized by at least one of the following features;
(i) gaseous CO2 hydrate promoter produced from a recycled source is introduced into said multicomponent gaseous stream comprising said CO2 hydrate promoter at a time prior to said separating step (c); and
(ii) said contacting step (b) occurs in a finned tubular reactor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
(i) gaseous CO2 hydrate promoter produced from a recycled source is introduced into said multicomponent gaseous stream comprising said CO2 hydrate promoter at a time prior to said separating step (c); and
(ii) said contacting step (b) occurs in a finned tubular reactor.
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5. The method according to claim 1, wherein said finned tubular reactor comprises a tubular reactor with a helical fin structure.
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6. The method according to claim 1, wherein said finned tubular reactor comprises a tubular reactor with a longitudinal fin structure.
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7. The method according to claim 1, wherein said aqueous fluid is CO2 nucleated water.
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8. The method according to claim 1, wherein said gaseous CO2 hydrate promoter in said multicomponent gaseous stream is a low molecular weight compound.
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9. The method according to claim 8, wherein said low molecular weight compound is a sulfur-containing compound.
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10. The method according to claim 9, wherein said sulfur containing compound is selected from the group consisting of H2S, SO2 and CS2.
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11. A system for selectively removing CO2 from a multicomponent gaseous stream to produce a CO2 depleted gaseous stream, said system comprising:
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(a) a hydrate formation reactor;
(b) a gaseous CO2 hydrate promoter recovery element for recovering gaseous CO2 hydrate promoter from a product stream from said reactor; and
(c) a gaseous CO2 hydrate promoter recycling element for recycling recovered gaseous CO2 hydrate promoter to said hydrate formation reactor or an input stream thereof. - View Dependent Claims (12, 13, 14, 15)
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- 16. A system for selectively removing CO2 from a multicomponent gaseous stream to produce a CO2 depleted gaseous stream comprising a finned tubular hydrate formation reactor.
Specification