The present invention provides a method for removing sulfur species from a gas stream without the use of a sulfur species removal process, such as an amine scrub. The sulfur species are removed by directly subjecting the gas stream to a sulfur recovery process, such as a Claus or sub-dewpoint Claus
The present invention provides a method for removing sulfur species from a gas stream without the use of a sulfur species removal process, such as an amine scrub. The sulfur species are removed by directly subjecting the gas stream to a sulfur recovery process, such as a Claus or sub-dewpoint Claus process at high pressure and moderate temperatures, wherein the sulfur recovery process comprises a catalyst which does not comprise activated carbon.
대표청구항▼
What is claimed is: 1. A method for producing a sweet gas stream from a sour gas stream, wherein the sweet gas stream comprises a decreased mole fraction of a sulfur species and an increased mole fraction of a fuel species in relation to the sour gas stream, said method comprising: (a) subjecting t
What is claimed is: 1. A method for producing a sweet gas stream from a sour gas stream, wherein the sweet gas stream comprises a decreased mole fraction of a sulfur species and an increased mole fraction of a fuel species in relation to the sour gas stream, said method comprising: (a) subjecting the sour gas stream to a sulfur recovery process, thus producing a sweet gas stream, without first subjecting the sour gas stream to a sulfur species removal process, said sulfur recovery process comprising a catalyst which does not comprise activated carbon, wherein said sulfur recovery process is a sub-dewpoint Claus process conducted at a pressure of between 10 atm and 110 atm and at a temperature of between about 300�� F. and about 500�� F., wherein the sulfur recovery process converts H2S to elemental sulfur. 2. The method according to claim 1, wherein said sour gas stream is not subjected to a change in pressure prior to step (a). 3. The method according to claim 1, wherein said sour gas stream is not subjected to a change in temperature prior to step (a). 4. The method according to claim 1, wherein said sulfur recovery process is conducted at a pressure of between about 20 atm and 50 atm. 5. The method according to claim 1, wherein said sulfur recovery process is conducted at a temperature of between about 300�� F. and about 400�� F. 6. The method according to claim 1, wherein the sour gas stream comprises natural gas. 7. The method according to claim 1, wherein the sour gas stream comprises synthesis gas. 8. The method according to claim 1, wherein the sour gas stream comprises refinery fuel gas. 9. The method according to claim 1, wherein the sulfur species mole fraction in said sour gas stream is 10% or less. 10. The method according to claim 1, wherein said sulfur species removal process is selected from amine scrubbing, solvent absorption, adsorption, electrochemical oxidation, and membrane treatment. 11. The method according to claim 1, wherein, in addition to the sour gas stream, a gas selected from air, O2, SO2 and combinations thereof, is introduced into said sulfur recovery process. 12. The method according to claim 1, wherein said elemental sulfur is a liquid. 13. The method according to claim 12, wherein said elemental sulfur collects on said catalyst, and said method further comprises regenerating said catalyst. 14. The method according to claim 13, wherein said regenerating comprises: a) depressurizing said sulfur recovery process; b) heating said catalyst; c) converting said solid sulfur and said liquid sulfur into sulfur vapor; d) removing said sulfur vapor from said sulfur recovery system; and e) cooling said catalyst. 15. The method according to claim 1, wherein said sulfur recovery process decreases the mole fraction of sulfur species in the sour gas stream by at least about 70%. 16. The method according to claim 1, wherein said sulfur recovery process decreases the mole fraction of sulfur species in the sour gas stream by at least about 98%. 17. The method according to claim 1, wherein said sulfur recovery process increases the CO2 mole fraction in said sour gas stream. 18. The method according to claim 1, wherein a property of said sour gas stream is altered, said property selected from humidity, temperature, pressure, and combinations thereof. 19. The method according to claim 1, further comprising subjecting said sour gas stream to a steam generation process. 20. The method according to claim 1, further comprising subjecting said sweet gas stream to a steam generation process. 21. The method according to claim 1, further comprising removing particulate material from said sour gas stream. 22. The method according to claim 1, further comprising removing particulate material from said sweet gas stream. 23. The method according to claim 1, further comprising contacting said sweet gas stream with an adsorbent filter to capture residual particles. 24. The method according to claim 23, wherein said adsorbent filter is selected from activated carbon, coal, and coke. 25. The method according to claim 23, further comprising regenerating said adsorbent filter. 26. The method according to claim 25, wherein said regenerating comprises: a) using steam or clean gas stream to absorb said residual particles; and b) subjecting the product of step (a) to said sulfur recovery process. 27. The method according to claim 1, further comprising subjecting said sweet gas stream to a CO2 recovery process, thus producing a low CO2 sweet gas stream. 28. The method according to claim 1, further comprising washing said sweet gas stream with water. 29. The method according to claim 1, further comprising separating said elemental sulfur by using an apparatus selected from a knock-out drum, coalescer, and filter.
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