초록 ▼

Methods are provided for the selective removal of CO 2 from a multicomponent gaseous stream to provide a CO 2 depleted gaseous stream. In practicing the subject methods, an initial multicomponent gaseous stream that includes a gaseous CO 2 hydrate promoter is contacted with an aqueous fluid, e.g.

Methods are provided for the selective removal of CO 2 from a multicomponent gaseous stream to provide a CO 2 depleted gaseous stream. In practicing the subject methods, an initial multicomponent gaseous stream that includes a gaseous CO 2 hydrate promoter is contacted with an aqueous fluid, e.g., CO 2 nucleated water, in a hydrate formation reactor under conditions of selective CO 2 clathrate formation to produce a CO 2 clathrate slurry and CO 2 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 CO 2 from a multicomponent gaseous stream.

대표청구항 ▼

1. A method for removing CO 2 from a multicomponent gaseous stream to produce a CO 2 depleted gaseous stream, said method comprising:(a) providing a multicomponent gaseous stream comprising a gaseous CO 2 hydrate promoter;(b) contacting said multicomponent gaseous stream with an aqueous fluid und

1. A method for removing CO 2 from a multicomponent gaseous stream to produce a CO 2 depleted gaseous stream, said method comprising:(a) providing a multicomponent gaseous stream comprising a gaseous CO 2 hydrate promoter;(b) contacting said multicomponent gaseous stream with an aqueous fluid under conditions sufficient to produce CO 2 hydrates, whereby CO 2 is removed from said gaseous stream by said aqueous fluid and concomitantly fixed as CO 2 clathrates upon said contacting to produce a CO 2 depleted gaseous stream and a CO 2 clathrate slurry; and(c) separating said CO 2 depleted gaseous stream from said CO 2 clathrate slurry to remove CO 2 from said multicomponent gaseous stream;with the proviso that said method is further characterized by at least one of the following features:(i) gaseous CO 2 hydrate promoter produced from a recycled source is introduced into said multicomponent gaseous stream comprising said CO 2 hydrate promoter at a time prior to said separating step (c); and(ii) said contacting step (b) occurs in a finned tubular reactor. 2. The method according to claim 1, wherein gaseous CO 2 hydrate promoter produced from a recycled source is introduced into said multicomponent gaseous stream comprising said CO 2 hydrate promoter at a time prior to said separating step (c). 3. The method according to claim 1, wherein said contacting step (b) occurs in a finned tubular reactor. 4. The method according to claim 1, wherein:(i) gaseous CO 2 hydrate promoter produced from a recycled source is introduced into said multicomponent gaseous stream comprising said CO 2 hydrate promoter at a time prior to said separating step (c); and(ii) said contacting step (b) occurs in a finned tubular reactor. 5. The method according to claim 1, wherein said finned tubular reactor comprises a tubular reactor with a helical fin structure. 6. The method according to claim 1, wherein said finned tubular reactor comprises a tubular reactor with a longitudinal fin structure. 7. The method according to claim 1, wherein said aqueous fluid is CO 2 nucleated water. 8. The method according to claim 1, wherein said gaseous CO 2 hydrate promoter in said multicomponent gaseous stream is a low molecular weight compound. 9. The method according to claim 8, wherein said low molecular weight compound is a sulfur-containing compound. 10. The method according to claim 9, wherein said sulfur containing compound is selected from the group consisting of H 2 S, SO 2 and CS 2 . 11. A system for selectively removing CO 2 from a multicomponent gaseous stream to produce a CO 2 depleted gaseous stream, said system comprising:(a) a hydrate formation reactor;(b) a gaseous CO 2 hydrate promoter recovery element for recovering gaseous CO 2 hydrate promoter from a product stream from said reactor; and(c) a gaseous CO 2 hydrate promoter recycling element for recycling recovered gaseous CO 2 hydrate promoter to said hydrate formation reactor or an input stream thereof. 12. The system according to claim 11, wherein said gaseous CO 2 hydrate promoter recovery element comprises a gaseous CO 2 hydrate promoter absorber and an absorbent/absorbed gaseous CO 2 hydrate promoter separator. 13. The system according to claim 12, wherein said absorbent/absorbed gaseous CO 2 hydrate promoter separator comprises a steam separator. 14. The system according to claim 11, wherein said gaseous CO 2 hydrate promoter recovery element comprises a lean absorbent recycling element for cycling lean absorbent from said separator to said absorber. 15. The system according to claim 11, wherein said hydrate formation reactor comprises a finned tubular reactor. 16. A system for selectively removing CO 2 from a multicomponent gaseous stream to produce a CO 2 depleted gaseous stream comprising a finned tubular hydrate formation reactor. 17. The system according to claim 16, wherein said finned tubular reactor comprises a tubular reactor with a helical fin structure. 18. The system according to claim 16, wherein said finned tubular reactor comprises a tubular reactor with a longitudinal fin structure. 19. The system according to claim 16, wherein said system further comprises a gaseous CO 2 hydrate promoter recovery element for recovering gaseous CO 2 hydrate promoter from a product stream from said reactor. 20. The system according to claim 19, wherein said system further comprises a gaseous CO 2 hydrate promoter recycling element for recycling recovered gaseous CO 2 hydrate promoter to said hydrate formation reactor or an input stream thereof.