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US 2021/0402347 A1Published application
Process and plant for removing disruptive components from raw synthesis gas
AssigneeL'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
InventorsRobert Szabo, Sophia Schmidt
Life of this patent
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Abstract
The invention relates to a process and plant for purifying a raw synthesis gas containing hydrogen and carbon monoxide as target components and carbon dioxide and sulfur components as disruptive components by gas scrubbing with a physically acting, liquid scrubbing medium selective for carbon dioxide and sulfur components. The process/the plant comprise an absorption apparatus, a hot regeneration apparatus, a preferably multistage flash regeneration apparatus and a reabsorber column supplied with the first portion of a stripping gas. According to the invention the flash regeneration apparatus is supplied with the second portion of the stripping gas
Claims14
A process for purifying a raw synthesis gas containing hydrogen and carbon monoxide as target components and carbon dioxide and sulfur components as disruptive components by gas scrubbing with a physically acting, liquid scrubbing medium selective for carbon dioxide and sulfur components comprising the steps of:
- a) providing an absorption apparatus comprising at least two absorption zones each provided with surface area-increasing internals, wherein in the gas flow direction of the raw synthesis gas initially at least one sulfur components absorption zone and subsequently at least one carbon dioxide absorption zone is traversed,
- b) providing a raw synthesis gas stream to be purified, cooling the raw synthesis gas stream through indirect heat exchange with a first cooling medium, introducing the cooled raw synthesis gas stream to the at least one sulfur components absorption zone,
- c) contacting the cooled raw synthesis gas stream in the at least one sulfur components absorption zone under sulfur components absorption conditions with a first scrubbing medium stream, discharging a synthesis gas stream depleted in sulfur components from the at least one sulfur components absorption zone, discharging a scrubbing medium stream enriched in sulfur components from the at least one sulfur components absorption zone, introducing the synthesis gas stream depleted in sulfur components to the at least one carbon dioxide absorption zone,
- d) contacting the synthesis gas stream depleted in sulfur components in the at least one carbon dioxide absorption zone under carbon dioxide absorption conditions with a second scrubbing medium stream, discharging a synthesis gas stream depleted in carbon dioxide from the at least one carbon dioxide absorption zone as pure synthesis gas, discharging a scrubbing medium stream enriched in carbon dioxide from the at least one carbon dioxide absorption zone,
- e) supplying the scrubbing medium stream enriched in sulfur components to a first flash regeneration apparatus and introducing it thereto, discharging a third scrubbing medium stream containing sulfur components and depleted in carbon dioxide by flashing and at least one first carbon dioxide-containing gas stream from the first flash regeneration apparatus,
- f) discharging a scrubbing medium stream enriched in carbon dioxide from the absorption apparatus, introducing it to a multistage second flash regeneration apparatus, wherein the pressures in the individual flash stages decrease in the flow direction of the scrubbing medium stream, discharging a fourth scrubbing medium stream depleted in carbon dioxide through multistage flashing and at least one second carbon dioxide-containing gas stream from the second flash regeneration apparatus,
- g) introducing the third and the fourth scrubbing medium stream into a reabsorber column, stripping the third scrubbing medium stream or the third and the fourth scrubbing medium stream in the reabsorber column with a first portion of a stripping gas, discharging a gaseous top product stream comprising carbon dioxide and stripping gas from the reabsorber column, discharging a liquid sump product stream from the reabsorber column, supplying the sump product stream to a hot regeneration apparatus and introducing it thereto,
- h) hot regenerating the sump product stream from the reabsorber column in the hot regeneration apparatus under hot regeneration conditions, discharging a product gas stream enriched in sulfur components and a fifth scrubbing medium stream depleted in sulfur components from the hot regeneration apparatus, recycling at least a portion of the fifth scrubbing medium stream after cooling as a constituent of the first and/or second scrubbing medium stream to the absorption apparatus,
- wherein
- i) a second portion of the stripping gas is introduced to the multistage second flash regeneration apparatus and an offgas stream comprising carbon dioxide and stripping gas is discharged therefrom.
7 more elements
A plant for purifying a raw synthesis gas containing hydrogen and carbon monoxide as target components and carbon dioxide and sulfur components as disruptive components by gas scrubbing with a physically acting, liquid scrubbing medium selective for carbon dioxide and sulfur components comprising the following assemblies and constituents in fluid connection with one another:
- a) an absorption apparatus comprising at least two absorption zones each provided with surface area-increasing, configured such that in the gas flow direction of the raw synthesis gas initially at least one first absorption zone and subsequently at least one second absorption zone is traversed,
- b) a means for providing a raw synthesis gas stream to be purified, a means for cooling the raw synthesis gas stream through indirect heat exchange with a first cooling medium, a means for introducing the cooled raw synthesis gas stream to the at least one sulfur components absorption zone,
- c) a means for contacting the cooled raw synthesis gas stream in the at least one sulfur components absorption zone with a first scrubbing medium stream, a means for discharging a synthesis gas stream depleted in sulfur components from the at least one sulfur components absorption zone, a means for discharging a scrubbing medium stream enriched in sulfur components from the at least one sulfur components absorption zone, a means for introducing the synthesis gas stream depleted in sulfur components to the at least one carbon dioxide absorption zone,
- ( ) a means for contacting the synthesis gas stream depleted in sulfur components in the at least one carbon dioxide absorption zone with a second scrubbing medium stream, a means for discharging a synthesis gas stream depleted in carbon dioxide from the at least one carbon dioxide absorption zone as pure synthesis gas, a means for discharging a scrubbing medium stream enriched in carbon dioxide from the at least one carbon dioxide absorption zone,
- e) a first flash regeneration apparatus, a means for supplying the scrubbing medium stream enriched in sulfur components to the first flash regeneration apparatus and introducing it thereto, a means for discharging a third scrubbing medium stream containing sulfur components and depleted in carbon dioxide by flashing and at least one first carbon dioxide-containing gas stream from the first flash regeneration apparatus,
- f) a multistage second flash regeneration apparatus configured such that the pressures in the individual flash stages decrease in the flow direction of the scrubbing medium stream, a means for discharging a scrubbing medium stream enriched in carbon dioxide from the absorption apparatus, a means for introducing it to the multistage second flash regeneration apparatus, a means for discharging a fourth scrubbing medium stream depleted in carbon dioxide through multistage flashing and at least one second carbon dioxide-containing gas stream from the second flash regeneration apparatus,
- g) a reabsorber column, a means for introducing the third and the fourth scrubbing medium stream into the reabsorber column, a means for supplying a first portion of a stripping gas to the reabsorber column, a means for discharging a gaseous top product stream comprising carbon dioxide and stripping gas from the reabsorber column, a hot regeneration apparatus, a means for discharging a liquid sump product stream from the reabsorber column and a means for supplying the sump product stream to a hot regeneration apparatus and introducing it thereto,
- h) a means for discharging a product gas stream enriched in sulfur components and a fifth scrubbing medium stream depleted in sulfur components from the hot regeneration apparatus, a means for recycling at least a portion of the fifth scrubbing medium stream after cooling as a constituent of the first and/or second scrubbing medium stream to the absorption apparatus,
- wherein
- i) said plant comprises a means which allow a second portion of the stripping gas to be introduced to the multistage second flash regeneration apparatus and an offgas stream comprising carbon dioxide and stripping gas to be discharged therefrom.
7 more elements
Dependencies are inferred from the claim text.