Configurations And Methods For Carbon Dioxide And Hydrogen Production From Gasification Streams
First Claim
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1. A plant comprising:
- a gasification unit configured to produce a syngas;
a desulfurization section fluidly coupled to the gasification unit to receive the syngas, wherein the desulfurization section includes a primary absorber, a COS hydrolysis unit, and a secondary absorber;
wherein the primary absorber is upstream of the COS hydrolysis unit, and wherein the COS hydrolysis unit is upstream of the secondary absorber;
wherein the primary and secondary absorbers are configured to absorb H2S from the syngas in a first solvent to thereby produce a desulfurized syngas;
a decarbonization section fluidly coupled to the desulfurization section to receive the desulfurized syngas and comprising a CO2 absorber that is configured to absorb CO2 from the desulfurized syngas and to produce a H2 product stream using a second solvent; and
wherein the desulfurization section is configured to regenerate the first solvent by stripping and wherein the decarbonization section is configured to regenerate the second solvent by flashing.
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Abstract
A syngas treatment plant is configured to remove sulfurous compounds and carbon dioxide from shifted or un-shifted syngas in a configuration having a decarbonization section and a desulfurization section. Most preferably, the solvent in the decarbonization section is regenerated and cooled by flashing, while the solvent is regenerated in the desulfurization section via stripping using external heat, and it is still further preferred that carbonylsulfide is removed in the desulfurization section via hydrolysis, and that the so produced hydrogen sulfide is removed in a downstream absorber.
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20 Claims
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1. A plant comprising:
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a gasification unit configured to produce a syngas; a desulfurization section fluidly coupled to the gasification unit to receive the syngas, wherein the desulfurization section includes a primary absorber, a COS hydrolysis unit, and a secondary absorber; wherein the primary absorber is upstream of the COS hydrolysis unit, and wherein the COS hydrolysis unit is upstream of the secondary absorber; wherein the primary and secondary absorbers are configured to absorb H2S from the syngas in a first solvent to thereby produce a desulfurized syngas; a decarbonization section fluidly coupled to the desulfurization section to receive the desulfurized syngas and comprising a CO2 absorber that is configured to absorb CO2 from the desulfurized syngas and to produce a H2 product stream using a second solvent; and wherein the desulfurization section is configured to regenerate the first solvent by stripping and wherein the decarbonization section is configured to regenerate the second solvent by flashing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A syngas treatment plant comprising:
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a gasification unit configured to produce a shifted syngas; a desulfurization section fluidly coupled to the gasification unit to receive the syngas, wherein the desulfurization section includes a primary absorber, a COS hydrolysis unit, and a secondary absorber; wherein the primary absorber is upstream of the COS hydrolysis unit, and wherein the COS hydrolysis unit is upstream of the secondary absorber; wherein the primary and secondary absorbers are configured to absorb H2S from the syngas in a solvent to thereby produce a desulfurized syngas; a decarbonization section fluidly coupled to the desulfurization section to receive the desulfurized syngas and comprising a CO2 absorber that is configured to absorb CO2 from the desulfurized syngas and to produce a H2 product stream using the solvent; and wherein the solvent is circulated between the desulfurization section and the decarbonization section.
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20. A syngas treatment plant comprising:
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a gasification unit configured to produce an un-shifted syngas; a desulfurization section fluidly coupled to the gasification unit to receive the syngas, wherein the desulfurization section includes a primary absorber, a shift reactor, a COS hydrolysis unit, and a secondary absorber; wherein the primary absorber is upstream of the COS hydrolysis unit, and wherein the COS hydrolysis unit is upstream of the secondary absorber; wherein the shift reactor is fluidly coupled between the primary and secondary absorber and configured to receive partially desulfurized syngas from the primary absorber; wherein the primary and secondary absorbers are configured to absorb H2S from the syngas in a first solvent to thereby produce a desulfurized syngas; and a decarbonization section fluidly coupled to the desulfurization section to receive the desulfurized syngas and comprising a CO2 absorber that is configured to absorb CO2 from the desulfurized syngas and to produce a H2 product stream using a second solvent.
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Specification