WO2024048579A1 - 酸性ガス吸着装置 - Google Patents

酸性ガス吸着装置 Download PDF

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Publication number
WO2024048579A1
WO2024048579A1 PCT/JP2023/031209 JP2023031209W WO2024048579A1 WO 2024048579 A1 WO2024048579 A1 WO 2024048579A1 JP 2023031209 W JP2023031209 W JP 2023031209W WO 2024048579 A1 WO2024048579 A1 WO 2024048579A1
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Prior art keywords
gas
adsorption
flow path
opening
desorption
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Ceased
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PCT/JP2023/031209
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English (en)
French (fr)
Japanese (ja)
Inventor
淳一 安藤
道夫 高橋
裕介 大熊
和希 飯田
博史 菅
行成 柴垣
宗太 前原
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NGK Insulators Ltd
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NGK Insulators Ltd
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Priority to EP23860341.9A priority Critical patent/EP4582169A1/en
Priority to AU2023334314A priority patent/AU2023334314A1/en
Priority to CN202380056422.8A priority patent/CN119789899A/zh
Priority to JP2024544283A priority patent/JPWO2024048579A1/ja
Publication of WO2024048579A1 publication Critical patent/WO2024048579A1/ja
Priority to US19/060,856 priority patent/US20250229213A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0407—Constructional details of adsorbing systems
    • B01D53/0446—Means for feeding or distributing gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/30—Physical properties of adsorbents
    • B01D2253/34—Specific shapes
    • B01D2253/342—Monoliths
    • B01D2253/3425—Honeycomb shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/20—Halogens or halogen compounds
    • B01D2257/204—Inorganic halogen compounds
    • B01D2257/2045—Hydrochloric acid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/302—Sulfur oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/304—Hydrogen sulfide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/306—Organic sulfur compounds, e.g. mercaptans
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/404—Nitrogen oxides other than dinitrogen oxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/06—Polluted air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
    • B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
    • B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0407—Constructional details of adsorbing systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2

Definitions

  • the present invention relates to an acid gas adsorption device.
  • Such acidic gases mainly include carbon dioxide (hereinafter sometimes referred to as CO 2 ), which causes global warming.
  • CO 2 carbon dioxide
  • a carbon dioxide capture, utilization, and storage (CCUS) cycle is known as a typical example of such an approach.
  • CCUS carbon dioxide capture, utilization, and storage
  • a gas separation unit including a carbon dioxide adsorption section having a pellet structure has been proposed (see, for example, Patent Document 1).
  • the carbon dioxide adsorbent adsorbs CO2 at a predetermined adsorption temperature, and when heated to a desorption temperature exceeding the adsorption temperature, the carbon dioxide adsorbent desorbs the adsorbed CO2 . do.
  • the desorbed CO 2 is recovered together with the desorbed gas by supplying the desorbed gas to the carbon dioxide adsorption section and allowing it to pass through.
  • the carbon dioxide adsorption part since the carbon dioxide adsorption part has a pellet structure, it is difficult to uniformly flow the desorption gas throughout the carbon dioxide adsorption part, and the desorption gas is not allowed to flow through the carbon dioxide adsorption part.
  • the temperature of the desorbed gas decreases as it goes to the later stages. Therefore, a temperature distribution may occur in the carbon dioxide adsorption part due to non-uniformity of the flow rate of the desorption gas in the carbon dioxide adsorption part and a decrease in the temperature of the desorption gas. As a result, there is a problem in that the carbon dioxide adsorption part partially becomes lower than the desorption temperature, and CO 2 cannot be sufficiently desorbed from the carbon dioxide adsorbent.
  • the main object of the present invention is to provide an acidic gas adsorption device that can stably desorb acidic gas from an acidic gas adsorbent.
  • the acidic gas adsorption device includes an acidic gas adsorption section through which a gas to be treated can pass in a predetermined direction.
  • the acidic gas adsorption section includes a first adsorption section and a second adsorption section.
  • the second adsorption section is spaced apart from the first adsorption section on the downstream side in the direction in which the gas to be treated passes.
  • the first adsorption section includes a first flow path.
  • the second adsorption section includes a second flow path.
  • a first desorption gas flow path communicating with the first flow path and the second flow path is formed between the first adsorption section and the second adsorption section in the direction in which the gas to be treated passes.
  • each of the first adsorption section and the second adsorption section includes a honeycomb-shaped base material having a plurality of cells extending from a first end surface to a second end surface. ; and an acidic gas adsorption layer located within the cell and containing an acidic gas adsorbent.
  • the cells of the first adsorption section include the first flow path, and the cells of the second adsorption section include the second flow path.
  • the acidic gas may be carbon dioxide.
  • the acidic gas adsorption device may further include a case and a first on-off valve.
  • the case houses the acidic gas adsorption section.
  • the first on-off valve is housed in the case and can open and close the internal space of the case.
  • the first on-off valve is arranged upstream of the first adsorption section in the direction of passage of the gas to be treated.
  • a second desorption gas flow path communicating with the first flow path is formed between the first on-off valve and the first adsorption section in the direction of passage of the gas to be treated. may have been done.
  • the case may have an inlet, an outlet, and a first opening.
  • the inlet is located at one end of the case in the direction in which the gas to be processed passes.
  • the outlet is located at the other end of the case in the direction of passage of the gas to be treated.
  • the first opening communicates with the first desorption gas flow path.
  • a portion of the internal space of the case where the first on-off valve is arranged may be configured as a first on-off opening that is opened and closed by the first on-off valve.
  • the opening area of the first opening/closing port may be larger than the opening area of the first opening.
  • the acidic gas adsorption device may further include a case and a second on-off valve.
  • the case houses the acidic gas adsorption section.
  • the second on-off valve is housed in the case and can open and close the internal space of the case.
  • the second on-off valve is arranged downstream of the second adsorption section in the direction of passage of the gas to be treated.
  • a third desorption gas flow path communicating with the second flow path is formed between the second adsorption part and the second on-off valve in the passing direction of the gas to be treated. may have been done.
  • the case may have an inlet, an outlet, and a first opening.
  • the inlet is located at one end of the case in the direction in which the gas to be processed passes.
  • the outlet is located at the other end of the case in the direction of passage of the gas to be treated.
  • the first opening communicates with the first desorption gas flow path.
  • a portion of the internal space of the case where the second on-off valve is arranged may be configured as a second on-off opening that is opened and closed by the second on-off valve.
  • the opening area of the second opening may be larger than the opening area of the first opening.
  • the first adsorption section may be divided into a plurality of parts in a direction perpendicular to the passage direction of the gas to be treated.
  • the second adsorption section may be divided into a plurality of parts in a direction perpendicular to the passage direction of the gas to be treated.
  • an acidic gas adsorption device that can stably desorb acidic gas from an acidic gas adsorbent.
  • FIG. 1 is a schematic diagram of an acid gas adsorption apparatus according to one embodiment of the present invention.
  • FIG. 2 is a schematic configuration diagram of an acidic gas adsorption device according to another embodiment of the present invention.
  • 3 is a schematic perspective view of one embodiment of the block of FIG. 2;
  • FIG. FIG. 4 is a central cross-sectional view of the block of FIG. 2.
  • FIG. 5 is a schematic block diagram of another embodiment of the block of FIG.
  • FIG. 6 is a schematic configuration diagram of an acidic gas adsorption device according to yet another embodiment of the present invention.
  • FIG. 7 is a schematic configuration diagram of an acidic gas adsorption device according to yet another embodiment of the present invention.
  • FIG. 8 is a schematic configuration diagram of an acidic gas adsorption device according to yet another embodiment of the present invention.
  • FIG. 9 is a schematic configuration diagram of an acidic gas adsorption device according to yet another embodiment of the present invention.
  • FIG. 1 is a schematic configuration diagram of an acid gas adsorption apparatus according to one embodiment of the present invention.
  • the illustrated acidic gas adsorption apparatus 100 includes an acidic gas adsorption section 10 through which a gas to be treated can pass in a predetermined direction.
  • the acidic gas adsorption section 10 includes a first adsorption section 1 and a second adsorption section 2.
  • the second adsorption section 2 is disposed at a distance from the first adsorption section 1 on the downstream side in the direction in which the gas to be processed passes.
  • the first adsorption section 1 includes a first flow path 94a.
  • the second adsorption section 2 includes a second flow path 94b.
  • a first desorption gas flow path 11 communicating with the first flow path 94a and the second flow path 94b is formed between the first adsorption unit 1 and the second adsorption unit 2 in the direction of passage of the gas to be treated.
  • the first adsorption section and the second adsorption section are arranged with a space between them in the direction of passage of the gas to be processed, and the first desorption gas flow path is formed between them.
  • the first desorption gas flow path communicates with the first flow path of the first adsorption section and the second flow path of the second adsorption section. Therefore, in the desorption process described later, the desorption gas is supplied to the first flow path and the second flow path via the first desorption gas flow path (see FIG.
  • the desorption gas is supplied to the first flow path and the second flow path.
  • the desorption gas that has passed through the second desorption gas flow path can be made to flow into the first desorption gas flow path (see FIG. 7).
  • the desorption gas can flow uniformly throughout the acidic gas adsorption section while reducing the distance through which the desorption gas flows. Thereby, the temperature distribution in the acidic gas adsorption part can be maintained uniformly, and the acidic gas can be stably desorbed from the acidic gas adsorbent.
  • each of the first adsorption section 1 and the second adsorption section 2 includes a honeycomb-shaped base material 9 and an acidic gas adsorption layer 5 (see FIGS. 3 and 4).
  • the honeycomb-shaped base material 9 has a plurality of cells 93 extending from the first end surface E1 to the second end surface E2 (see FIG. 4).
  • the acidic gas adsorption layer 5 is located within the cell 93 and contains an acidic gas adsorbent.
  • the cell 93 of the first adsorption section 1 includes a first flow path 94a.
  • the cell 93 of the second adsorption section 2 includes a second flow path 94b.
  • the desorption gas can flow more uniformly throughout the acidic gas adsorption unit, and the temperature distribution in the acidic gas adsorption unit can be improved. Can be maintained uniformly.
  • the plurality of cells 93 extend in the direction of passage of the gas to be treated, and are arranged in parallel in a direction perpendicular to the direction of passage of the gas to be treated. Therefore, in the first adsorption section 1, the plurality of first flow paths 94a are arranged in parallel in a direction perpendicular to the passage direction of the gas to be treated, and in the second adsorption section 2, the plurality of first flow paths 94a of the second adsorption section 2 are arranged in parallel.
  • the two flow paths 94b are arranged in parallel in a direction perpendicular to the passage direction of the gas to be treated.
  • the first desorption gas flow path 11 extends in a direction perpendicular to the passage direction of the gas to be processed, and communicates with all of the plurality of first flow paths 94a and the plurality of second flow paths 94b. .
  • the dimensions of the first adsorption section 1 are, for example, 0.5 or more, preferably 0.8 or more, relative to the dimensions of the second adsorption section 2, and are, for example, 1.5 or less, preferably It is 1.2 or less, more preferably 1.
  • the dimensions of each of the first adsorption section 1 and the second adsorption section 2 in the direction of passage of the gas to be treated are, for example, 0.25 m or more, preferably 0.30 m or more, and, for example, 1.0 m or less, preferably 0.5 m. It is as follows.
  • the length of the first flow path of the first adsorption section and the length of the second flow path of the second adsorption section 2 can be ensured in a well-balanced manner. Therefore, it is possible to suppress the temperature difference from occurring between the first adsorption part and the second adsorption part in the desorption step, and it is possible to more stably desorb the acidic gas from the acidic gas adsorbent.
  • the dimension of the first desorption gas flow path 11 in the direction of passage of the gas to be treated is the distance between the first adsorption section 1 and the second adsorption section 2, and the dimension in the direction perpendicular to the direction of passage of the gas to be treated ( This is the width of the first desorption gas flow path 11 when viewed from the depth direction of the paper surface of FIG.
  • the dimensions of the first desorption gas flow path 11 are, for example, 1/100 or more, preferably 1/20 or more, and for example 1/5 of the dimensions of the first adsorption section 1. It is preferably 1/10 or less.
  • the dimensions of the first desorption gas flow path 11 in the passing direction of the gas to be treated are, for example, 0.2 cm or more, preferably 0.5 cm or more, and are, for example, 5 cm or less, preferably 2 cm or less. With this design, the resistance to permeation through the adsorption portion becomes sufficiently greater than the permeation resistance of the desorption gas flow path, so that the desorption gas can be distributed uniformly.
  • the dimensions of the desorption gas flow path are determined based on the resistance of the adsorption part, but as long as the distribution of the desorption gas is uniform, the dimensions of the desorption gas flow path may be changed as appropriate depending on the purpose of the effect. be able to.
  • the dimensions of the first desorption gas flow path are within the above range, it is possible to suppress the target gas from remaining in the first desorption gas flow path in the adsorption step described later, and in the desorption step described later. Allows desorption gas to pass through smoothly.
  • the pressure loss in the first adsorption section 1 is greater than the pressure loss in the first desorption gas passage 11
  • the pressure loss in the second adsorption section 2 is greater than the pressure loss in the first desorption gas passage. This is larger than the pressure loss in the gas flow path 11.
  • the respective dimensions of the first adsorption section 1 and the second adsorption section 2 in the direction orthogonal to the passage direction of the gas to be treated are not particularly limited, and are, for example, 1.5 m or more, preferably 2.0 m or more, and are, for example, 4 m or more. .0m or less, preferably 3.0m or less.
  • the acid gas adsorption device 100 further includes a case 6.
  • the case 6 houses an acidic gas adsorption section 10 that includes a first adsorption section 1 , a second adsorption section 2 , and a first desorption gas flow path 11 .
  • the case 6 has a cylindrical shape extending in the direction in which the gas to be processed passes.
  • One end of the case 6 is configured as an inlet 64, and the other end of the case 6 is configured as an outlet 65.
  • the case 6 has an inlet 64 and an outlet 65.
  • the inlet 64 is located at one end of the case 6 in the direction of passage of the gas to be processed.
  • the gas to be treated passes through the inlet 64 and flows into the internal space of the case 6 .
  • the outlet 65 is located at the other end of the case 6 in the direction of passage of the gas to be processed.
  • the process gas whose acidic gas concentration has been reduced after passing through the acidic gas adsorption unit 10 passes through the outlet 65 and flows out from the case 6 .
  • the opening area of the inlet 64 and the opening area of the outlet 65 may be the same or different. In the illustrated example, the opening area of the inlet 64 and the opening area of the outlet 65 are the same.
  • a first opening 61 that communicates with the first desorption gas flow path 11 is typically formed in the side wall of the case 6 .
  • the case 6 further includes the first opening 61.
  • the direction in which the first opening 61 extends may be parallel to the direction in which the first desorption gas flow path 11 extends, or may be inclined so as to intersect with the direction in which the first desorption gas flow path 11 extends. .
  • the direction in which the first opening 61 extends is parallel to the direction in which the first desorption gas flow path 11 extends.
  • the first opening 61 is provided with a first valve 16, and the desorption gas supply unit is capable of supplying desorption gas to the first desorption gas channel 11 via the first valve 16. (not shown) is connected.
  • the acid gas adsorption device 100 further includes a first on-off valve 7.
  • the first on-off valve 7 is housed in the case 6 and can open and close the internal space of the case 6.
  • the first on-off valve 7 is arranged on the upstream side of the first adsorption section 1 in the passage direction of the gas to be treated.
  • Examples of the first on-off valve 7 include a ball valve, a gate valve, and a butterfly valve. In the illustrated example, the first on-off valve 7 is a butterfly valve.
  • a second desorption gas flow path that communicates with the first flow path 94a is located between the first on-off valve 7 and the first adsorption section 1 in the direction in which the gas to be treated passes through. 12 is formed.
  • the first desorption gas flow path and the second desorption gas flow path allow the desorption gas to flow smoothly and uniformly throughout the first adsorption section, and the first desorption gas flow path allows the desorption gas to flow smoothly and uniformly throughout the first adsorption section.
  • Acid gas can be stably desorbed from the acid gas adsorbent containing the acid gas.
  • a portion of the internal space of the case 6 where the first on-off valve 7 is arranged is configured as a first on-off opening 70 that is opened and closed by the first on-off valve 7 .
  • the opening area of the first opening/closing port 70 is typically larger than the opening area of the first opening 61.
  • the opening area of the first opening/closing port 70 is, for example, 8 to 12 times as large as the opening area of the first opening 61. If the opening areas of the first opening and closing port and the first opening have such a relationship, it is possible to maintain both the pressure loss in the adsorption process low and the uniform distribution of the desorbed gas in the desorption process.
  • the acidic gas can be sufficiently desorbed.
  • the opening area of the first opening/closing port 70 may be the same as the opening area of the inflow port 64, or may be different from the opening area of the inflow port 64. In the illustrated example, the opening area of the first opening/closing port 70 is larger than the opening area of the inlet 64. Thereby, it is possible to maintain both the pressure loss in the adsorption process low and the uniform distribution of the desorption gas in the desorption process, and it is possible to sufficiently desorb the acidic gas.
  • the opening area of the first opening/closing port 70 is defined as the opening area of the case 6 in a cross section of the case 6 where the first opening/closing valve 7 is located in a direction perpendicular to the axial direction of the case 6 (the direction in which the gas to be treated passes). is the area of the part surrounded by the side walls of
  • the second desorption gas flow path 12 is located on the opposite side of the first desorption gas flow path 11 with respect to the first adsorption section 1 .
  • the second desorption gas flow path 12 extends in a direction perpendicular to the passage direction of the gas to be treated, and communicates with all of the plurality of first flow paths 94a.
  • the dimension of the second desorption gas flow path 12 in the direction of passage of the gas to be treated is the distance between the first adsorption section 1 and the first on-off valve 7 in the closed state, and is perpendicular to the direction of passage of the gas to be treated. This is the width of the second desorption gas flow path 12 when viewed from the direction (the depth direction of the paper plane in FIG. 1).
  • the maximum dimension of the second desorption gas flow path 12 is, for example, 1/100 or more, preferably 1/20 or more, of the dimension of the first adsorption section 1, for example, 1/20 or more. 5 or less, preferably 1/10 or less.
  • the maximum dimension of the second desorption gas flow path 12 in the passing direction of the gas to be treated is, for example, 0.2 cm or more, preferably 0.5 cm or more, and is, for example, 5 cm or less, preferably 2 cm or less. If the maximum dimension of the second desorption gas flow path is within the above range, the desorption gas can be smoothly passed through in the desorption process described later. In one embodiment, the pressure loss in the first adsorption section 1 is greater than the pressure loss in the second desorption gas flow path 12 during passage of the desorption gas.
  • a second opening 62 communicating with the second desorption gas flow path 12 is formed in the side wall of the case 6 .
  • the case 6 further includes the second opening 62.
  • the extending direction of the second opening 62 may be parallel to the extending direction of the second desorption gas flow path 12 (see FIG. 1), or may be inclined so as to intersect with the extending direction of the second desorption gas flow path 12. (See Figure 8).
  • the second opening 62 is provided with a second valve 17, and a recovery unit collects the desorbed gas containing the acidic gas desorbed from the acidic gas adsorbent through the second valve 17. (not shown) is connected.
  • the opening area of the second opening 62 may be the same as the opening area of the first opening 61, or may be different from the opening area of the first opening 61. In the illustrated example, the opening area of the second opening 62 is the same as the opening area of the first opening 61. The opening area of the second opening 62 is typically smaller than the opening area of the first opening/closing opening 70.
  • the acidic gas adsorption device 100 may have a duct 68 instead of the second opening 62.
  • the duct 68 communicates with the second desorption gas flow path 12 .
  • the duct 68 integrally includes a first portion extending along the passage direction of the gas to be treated and a second portion extending in a direction intersecting (typically orthogonal to) the passing direction of the gas to be treated. has.
  • One end of the first portion communicates with the second desorption gas flow path 12 .
  • the second portion extends continuously from the other end of the first portion.
  • a second valve 17 is typically provided at the free end of the second portion.
  • the duct 68 may be provided integrally with the case 6 or may be attached to the case 6 as a separate body.
  • the acidic gas adsorption device 100 further includes a second on-off valve 8.
  • the second on-off valve 8 is housed in the case 6 and can open and close the internal space of the case 6.
  • the second on-off valve 8 is arranged on the downstream side of the second adsorption section 2 in the passage direction of the gas to be processed.
  • Examples of the second on-off valve 8 include a ball valve, a gate valve, and a butterfly valve. In the illustrated example, the second on-off valve 8 is a butterfly valve.
  • a third desorption gas flow path that communicates with the second flow path 94b is located between the second adsorption unit 2 and the second on-off valve 8 in the passing direction of the gas to be treated. 13 is formed.
  • the first desorption gas flow path and the third desorption gas flow path allow the desorption gas to flow smoothly and uniformly throughout the second adsorption section
  • the second desorption gas flow path allows the desorption gas to flow smoothly and uniformly throughout the second adsorption section.
  • Acid gas can be stably desorbed from the acid gas adsorbent containing the acid gas.
  • a portion of the internal space of the case 6 where the second on-off valve 8 is arranged is configured as a second on-off opening 80 that is opened and closed by the second on-off valve 8 .
  • the opening area of the second opening/closing port 80 is typically larger than the opening area of each of the first opening 61 and the second opening 62.
  • the opening area of the second opening/closing port 80 is, for example, 8 to 12 times as large as the opening area of the first opening 61. If the opening areas of the second opening and closing port and the first opening have such a relationship, it is possible to maintain both a low pressure loss in the adsorption process and a uniform distribution of the desorbed gas during the desorption process. be able to.
  • the opening area of the second opening/closing opening 80 may be the same as the opening area of the first opening/closing opening 70, or may be different from the opening area of the first opening/closing opening 70.
  • the opening area of the second opening/closing port 80 is the same as the opening area of the first opening/closing port 70.
  • the opening area of the second opening/closing port 80 may be the same as the opening area of the outflow port 65, or may be different from the opening area of the outflow port 65. In the illustrated example, the opening area of the second opening/closing port 80 is larger than the opening area of the outflow port 65.
  • the opening area of the second opening/closing port 80 is defined as the opening area of the case 6 in a cross section of the case 6 where the second opening/closing valve 8 is located in a direction perpendicular to the axial direction of the case 6 (the direction in which the gas to be processed passes). is the area of the part surrounded by the side walls of
  • the third desorption gas flow path 13 is located on the opposite side of the first desorption gas flow path 11 with respect to the second adsorption section 2.
  • the third desorption gas flow path 13 extends in a direction perpendicular to the passage direction of the gas to be processed, and communicates with all of the plurality of second flow paths 94b.
  • the dimension of the third desorption gas flow path 13 in the direction of passage of the gas to be treated is the distance between the second adsorption section 2 and the second on-off valve 8 in the closed state, and is perpendicular to the direction of passage of the gas to be treated. This is the width of the third desorption gas flow path 13 when viewed from the direction (the depth direction of the paper plane in FIG. 1).
  • the range of the maximum dimension of the third desorption gas flow path 13 in the passing direction of the gas to be processed is the same as the range of the maximum dimension of the second desorption gas flow path 12 described above. If the maximum dimension of the third desorption gas flow path 13 is within the above range, the desorption gas can be smoothly passed through in the desorption process described later.
  • the pressure loss in the second adsorption section 2 is greater than the pressure loss in the third desorption gas passage 13 during passage of the desorption gas.
  • a third opening 63 communicating with the third desorption gas flow path 13 is formed in the side wall of the case 6 .
  • the case 6 further includes the third opening 63.
  • the direction in which the third opening 63 extends may be parallel to the direction in which the third desorption gas flow path 13 extends, or may be inclined so as to intersect with the direction in which the third desorption gas flow path 13 extends.
  • the third opening 63 is provided with a third valve 18, and a recovery unit recovers the desorbed gas containing the acidic gas desorbed from the acidic gas adsorbent through the third valve 18. (not shown) is connected.
  • the opening area of the third opening 63 may be the same as the opening area of the second opening 62, or may be different from the opening area of the second opening 62. In the illustrated example, the opening area of the first opening 61, the opening area of the second opening 62, and the opening area of the third opening 63 are the same. The opening area of the third opening 63 is typically smaller than the opening area of the second opening/closing opening 80. Further, the acid gas adsorption device 100 may have a duct communicating with the third desorption gas flow path 13 instead of the third opening 63.
  • the first adsorption section 1 is divided into a plurality of first blocks 1a in a direction perpendicular to the passage direction of the gas to be treated.
  • the first adsorption section 1 is constituted by a plurality of first blocks 1a arranged in a direction perpendicular to the passage direction of the gas to be processed.
  • the first suction section can be configured by manufacturing a relatively small first block. Therefore, the first suction section can be manufactured more easily than when the first suction section is manufactured all at once.
  • the first blocks 1a that are adjacent to each other among the plurality of first blocks 1a may have a gap formed therebetween, or may be in contact with each other in a direction perpendicular to the direction in which the gas to be processed passes. Further, although not shown, a plate-like member may be provided between the first blocks 1a adjacent to each other.
  • the first adsorption section 1 is divided into four parts in the vertical direction of the paper (the direction perpendicular to the direction in which the gas to be treated passes).
  • the first suction unit 1 may be divided into a plurality of parts in the depth direction of the drawing (a direction perpendicular to the direction in which the gas to be processed passes).
  • the number of first blocks 1a is, for example, 2 or more, preferably 3 or more, more preferably 5 or more, and, for example, 300 or less.
  • the second adsorption section 2 is divided into a plurality of second blocks 2a in a direction perpendicular to the passing direction of the gas to be treated.
  • the second adsorption section 2 is constituted by a plurality of second blocks 2a arranged in a direction perpendicular to the passage direction of the gas to be processed.
  • the second suction section can be configured by manufacturing a relatively small second block. Therefore, the second suction section can be manufactured more easily than when the second suction section is manufactured all at once.
  • the second blocks 2a that are adjacent to each other among the plurality of second blocks 2a may have a gap formed therebetween, or may be in contact with each other in a direction perpendicular to the passage direction of the gas to be processed. Further, although not shown, a plate member may be provided between the second blocks 2a adjacent to each other.
  • the second adsorption section 2 is divided into four parts in the vertical direction of the paper (the direction perpendicular to the direction in which the gas to be processed passes).
  • the second suction unit 2 may be divided into a plurality of parts in the depth direction of the drawing (a direction perpendicular to the direction in which the gas to be processed passes).
  • the number of second blocks 2a is, for example, 2 or more, preferably 3 or more, more preferably 5 or more, and, for example, 300 or less.
  • acid gases adsorbed by the acid gas adsorption unit 10 include carbon dioxide (CO 2 ), hydrogen sulfide, sulfur dioxide, nitrogen dioxide, dimethyl sulfide (DMS), and hydrogen chloride.
  • the acid gas is carbon dioxide ( CO2 ) and the fluid is a CO2 - containing gas.
  • the CO 2 -containing gas may contain nitrogen in addition to CO 2 .
  • the CO2 - containing gas is typically air (atmosphere).
  • the CO 2 concentration in the CO 2 -containing gas before being supplied to the acidic gas adsorption device is, for example, 100 ppm (volume basis) or more and 2 volume % or less. Below, the case where the acidic gas is carbon dioxide (CO 2 ) will be explained in detail.
  • the acidic gas adsorption unit 10 includes the first adsorption unit 1 and the second adsorption unit 2.
  • the first suction section 1 and the second suction section 2 have similar configurations.
  • the first adsorption section 1 (integrally formed) shown in FIG. 1 and the first block 1a shown in FIG. 2 have the same configuration except that they are different in size. Therefore, below, the first block 1a shown in FIG. 2 will be cited and its configuration will be explained in detail.
  • the first block 1a includes the honeycomb-shaped base material 9 and the acidic gas adsorption layer 5, as described above.
  • honeycomb-shaped base material The honeycomb-shaped base material 9 typically includes partition walls 92 that define a plurality of cells 93.
  • the cells 93 extend from the first end face E1 (inflow end face) to the second end face E2 (outflow end face) of the honeycomb base material 9 in the length direction (axial direction) of the honeycomb base material 9 (see FIG. 4). ).
  • the cells 93 have any suitable shape in a cross section taken in a direction perpendicular to the length direction of the honeycomb-like base material 9. Examples of the cross-sectional shape of the cell include a triangle, a quadrangle, a pentagon, a hexagon or more polygon, a circle, and an ellipse. All of the cross-sectional shapes and sizes of the cells may be the same, or at least some of them may be different. Among the cross-sectional shapes of such cells, preferred are hexagons and quadrangles, and more preferred are squares, rectangles, and hexagons.
  • the cell density (that is, the number of cells 93 per unit area) in the cross section of the honeycomb-like base material in the direction perpendicular to the length direction can be appropriately set depending on the purpose.
  • the cell density can be, for example, from 4 cells/cm 2 to 320 cells/cm 2 . If the cell density is within this range, sufficient strength and effective GSA (geometric surface area) of the honeycomb-like base material can be ensured.
  • the honeycomb-shaped base material 9 has any suitable shape (overall shape). Examples of the shape of the honeycomb-like base material include a columnar shape with a circular bottom surface, an elliptic columnar shape with an elliptical bottom surface, a prismatic shape with a polygonal bottom surface, and a columnar shape with an irregular bottom surface.
  • the illustrated honeycomb base material 9 has a prismatic shape.
  • the outer diameter and length of the honeycomb-shaped base material can be appropriately set depending on the purpose.
  • the honeycomb-shaped base material may have a hollow region at its center in a cross section taken in a direction perpendicular to the length direction.
  • the honeycomb-shaped base material 9 typically includes an outer wall 91 and partition walls 92 located inside the outer wall 91.
  • the outer wall 91 and the partition wall 92 are integrally formed.
  • the outer wall 91 and the partition wall 92 may be separate bodies.
  • the outer wall 91 has a rectangular tube shape.
  • the thickness of the outer wall 91 can be arbitrarily and appropriately set.
  • the thickness of the outer wall 91 is, for example, 0.1 mm to 10 mm.
  • the partition wall 92 defines a plurality of cells 93. More specifically, the partition 92 has a first partition 92 a and a second partition 92 b that are orthogonal to each other, and the first partition 92 a and the second partition 92 b define a plurality of cells 93 .
  • the cross-sectional shape of the cell 93 is approximately rectangular. Note that the configuration of the partition wall is not limited to the partition wall 92 described above.
  • the partition wall may include a first partition wall extending in the radial direction and a second partition wall extending in the circumferential direction, which may define a plurality of cells.
  • the thickness of the partition wall 92 can be appropriately set depending on the use of the acid gas adsorption device.
  • the thickness of the partition wall 92 is typically thinner than the thickness of the outer wall 91.
  • the thickness of the partition wall 92 is, for example, 0.03 mm to 0.6 mm.
  • the thickness of the partition wall is measured by, for example, cross-sectional observation using a SEM (scanning electron microscope). If the thickness of the partition walls is within this range, the mechanical strength of the honeycomb-like base material can be made sufficient, and the opening area (the total area of cells in the cross section) can be made sufficient. can.
  • the porosity of the partition wall 92 can be appropriately set depending on the purpose.
  • the porosity of the partition wall 92 is, for example, 15% or more, preferably 20% or more, and is, for example, 70% or less, preferably 45% or less. Note that the porosity can be measured, for example, by mercury porosimetry.
  • the bulk density of the partition wall 92 can be appropriately set depending on the purpose. Their bulk density is, for example, 0.10 g/cm 3 or more, preferably 0.20 g/cm 3 or more, and, for example, 0.60 g/cm 3 or less, preferably 0.50 g/cm 3 or less. Note that the bulk density can be measured, for example, by mercury porosimetry.
  • a typical material for forming the partition wall 92 is ceramics.
  • ceramics include silicon carbide, silicon-silicon carbide composite materials, cordierite, mullite, alumina, silicon nitride, spinel, silicon carbide-cordierite composite materials, lithium aluminum silicate, and aluminum titanate.
  • the materials constituting the partition wall can be used alone or in combination.
  • preferred are cordierite, alumina, mullite, silicon carbide, silicon-silicon carbide composite materials, and silicon nitride, and more preferred are silicon carbide and silicon-carbide. Examples include silicon-based composite materials.
  • Such a honeycomb-shaped base material 9 is typically produced by the following method. First, a binder and water or an organic solvent are added as necessary to the material powder containing the ceramic powder described above, the resulting mixture is kneaded to form a clay, and the clay is molded into a desired shape (typically (extrusion molding), followed by drying and, if necessary, firing, to produce the honeycomb-shaped base material 9. When firing, it is fired at, for example, 1200°C to 1500°C. The firing time is, for example, 1 hour or more and 20 hours or less.
  • the acidic gas adsorption layer 5 is formed on the surface of the partition wall 92 within the cell 93 .
  • a flow path 94 (first flow path 94a or second flow path 94b) is formed in a section of the cell 93 where the acid gas adsorption layer 5 is not formed (typically in the center). It is formed.
  • the acidic gas adsorption layer 5 may be formed on the entire inner surface of the partition wall 92 (that is, so as to surround the flow path 94) as shown in the illustrated example, or may be formed on a part of the surface of the partition wall. When the acidic gas adsorption layer 5 is formed on the entire inner surface of the partition wall 92, the adsorption efficiency of acidic gas (typically CO 2 ) can be improved.
  • the flow path 94 extends from the first end surface E1 (inflow end surface) to the second end surface E2 (outflow end surface).
  • the cross-sectional shape of the flow path 94 includes the same cross-sectional shape as the cell 93 described above, preferably a hexagon or a quadrilateral, and more preferably a square, a rectangle, or a hexagon. All of the cross-sectional shapes and sizes of the channels 94 may be the same, or at least some of them may be different.
  • a gas to be treated containing an acidic gas is supplied to the cell 93 (more specifically, a flow path 94) in an adsorption process described later, and a desorption gas flows in a desorption process described later.
  • the acidic gas adsorption layer 5 contains an acidic gas adsorbent depending on the acidic gas to be adsorbed.
  • the acid gas adsorbent is a carbon dioxide adsorbent. Any suitable compound capable of adsorbing and desorbing CO 2 may be employed as the carbon dioxide adsorbent.
  • carbon dioxide adsorbents include nitrogen-containing compounds described below; alkaline compounds such as sodium hydroxide and potassium hydroxide; carbonates such as calcium carbonate and potassium carbonate; hydrogen carbonates such as calcium hydrogen carbonate and potassium hydrogen carbonate; MOF.
  • organometallic frameworks such as MOF-74, MOF-200, and MOF-210
  • zeolites activated carbon
  • nitrogen-doped carbon and ionic liquids.
  • Carbon dioxide adsorbents can be used alone or in combination.
  • nitrogen-containing compounds include primary amines such as monoethanolamine and polyvinylamine; secondary amines such as diethanolamine, cyclic amines, and N-(3-aminopropyl)diethanolamine; methyldiethylamine and triethanol.
  • Tertiary amines such as amines; ethylene amine compounds such as tetraethylenepentamine; aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, N-(2-aminoethyl)-3-aminopropyl-trimethoxysilane, Aminosilane coupling agents such as polyethyleneimine-trimethoxysilane; imine compounds such as ethyleneimine, linear polyethyleneimine, and branched polyethyleneimine having primary to tertiary amino groups; 1-(2-hydroxy Examples include piperazine compounds such as ethyl)piperazine; amide compounds such as polyamide amine; polyvinylamine; and organic/inorganic compounds to which an amino group is added as a substituent.
  • methyldiethylamine monoethanolamine, cyclic amine, diethanolamine, tetraethylenepentamine, ethyleneimine, linear polyethyleneimine, branched polyethyleneimine, and organic compounds with amino added as a substituent are preferred.
  • /Inorganic compounds methyldiethylamine, monoethanolamine, cyclic amine, diethanolamine, tetraethylenepentamine, ethyleneimine, linear polyethyleneimine, branched polyethyleneimine, and organic compounds with amino added as a substituent are preferred. /Inorganic compounds.
  • An ionic liquid is a liquid "salt" composed only of ions (anions and cations), and is in a liquid state at normal temperature and pressure (23° C., 0.1 MPa).
  • Examples of the cation of the ionic liquid include ammonium ions such as imidazolium salts and pyridinium salts, phosphonium ions, sulfonium salts, and inorganic ions.
  • Examples of the anion of the ionic liquid include halogen-based anions such as bromide ion and triflate; boron-based such as tetraphenylborate; phosphorus-based such as hexafluorophosphate; and sulfur-based such as alkyl sulfonate.
  • a combination of imidazolium salts as a cation and triflate as an anion is preferably used.
  • the ionic liquid is more preferably used in combination with a carbon dioxide adsorbent other than the ionic liquid (hereinafter referred to as "other carbon dioxide adsorbent").
  • the ionic liquid coats other carbon dioxide adsorbents (eg, nitrogen-containing compounds). Therefore, it is possible to improve the performance and extend the life of the carbon dioxide adsorbent.
  • the content ratio of the ionic liquid is, for example, 0.000001 parts by mass or more, preferably 0.00001 parts by mass or more, and, for example, 0.1 parts by mass or less, preferably 0. It is .05 parts by mass or less. When the content ratio of the ionic liquid is within the above range, it is possible to stably improve the performance and extend the life of the carbon dioxide adsorbent.
  • the acidic gas adsorbent layer 5 further includes a porous carrier in addition to the above-described acidic gas adsorbent.
  • the acidic gas adsorbent is typically supported on a porous carrier and faces the flow path.
  • the acidic gas adsorbent layer contains a porous carrier, it is possible to suppress the acidic gas adsorbent from falling off from the acidic gas adsorbent layer during the adsorption step and/or the desorption step.
  • the porous carrier can form mesopores in the acidic gas adsorbent layer.
  • porous carriers include organometallic frameworks (MOF) such as MOF-74, MOF-200, MOF-210; activated carbon; nitrogen-doped carbon; mesoporous silica; mesoporous alumina; zeolite; carbon nanotubes; polyvinylidene fluoride (PVDF); ), and preferred examples include metal organic frameworks (MOF), activated carbon, PVDF, zeolite, mesoporous silica, and mesoporous alumina.
  • Porous carriers can be used alone or in combination.
  • the porous carrier is preferably made of a material different from that of the acidic gas adsorbent.
  • the BET specific surface area of the porous carrier is, for example, 50 m 2 /g or more, preferably 500 m 2 /g or more. If the surface area of the porous carrier is equal to or greater than the above lower limit, the acidic gas adsorbent can be supported stably, and the acidic gas adsorption efficiency can be improved.
  • the upper limit of the BET specific surface area of the porous carrier is typically 2000 m 2 /g or less.
  • the total content of the acidic gas adsorbent and the porous carrier in the acidic gas adsorbent layer is, for example, 30% by mass or more, preferably 50% by mass. % or more, for example, 100% by mass or less, preferably 99% by mass or less.
  • the content of the acidic gas adsorbent in the acidic gas adsorbent layer is, for example, 30% by mass or more, preferably 50% by mass or more, and, for example, 99% by mass or less.
  • the content ratio of the porous carrier is, for example, 0.01 part by mass or more, preferably 0.3 part by mass or more, and, for example, 0.7 part by mass or less, preferably 0.01 part by mass or more, per 1 part by mass of the acidic gas adsorbent. It is 5 parts by mass or less.
  • the content of the porous carrier is within the above range, the acidic gas adsorbent can be supported even more stably.
  • the acidic gas adsorbent layer may be composed only of acidic gas adsorbent.
  • the acidic gas adsorbent is directly supported on the partition wall 92 and faces the flow path.
  • the content of the acidic gas adsorbent in the acidic gas adsorbent layer is typically 95.0% by mass or more and 100% by mass or less.
  • excellent acidic gas adsorption efficiency can be stably ensured.
  • Such an acidic gas adsorbent layer is typically produced by the following method.
  • a solution of the acidic gas adsorbent is prepared by dissolving the acidic gas adsorbent described above in a solvent.
  • the above-mentioned porous carrier is added to the solvent as necessary.
  • the order of addition of the acidic gas adsorbent and the porous carrier is not particularly limited.
  • a solution of the acidic gas adsorbent is applied onto the base material (specifically, the partition wall), and then the coating film is dried and optionally sintered to form an acidic gas adsorbent layer.
  • the configuration of the acidic gas adsorption section (the first adsorption section and the second adsorption section) is not limited to the above.
  • the first block 1a includes a plurality of adsorbent layers 71.
  • the plurality of adsorbent layers 71 are stacked at intervals in their thickness direction.
  • a flow path 94 (first flow path 94a or second flow path 94b) is formed at intervals between adjacent adsorbent layers 71 among the plurality of adsorbent layers 71.
  • five adsorbent layers 71 are arranged in parallel, but the number of adsorbent layers 71 is not limited to this.
  • the number of adsorbent layers 71 is, for example, 5 or more, preferably 10 or more, and more preferably 20 or more.
  • the interval between adjacent adsorbent layers 71 among the plurality of adsorbent layers 71 is, for example, 0.5 cm or more and 1.5 cm or less.
  • Each of the plurality of adsorbent layers 71 includes a flexible fiber member 73 and a plurality of pellet-like adsorbents 72.
  • the flexible fiber member 73 allows the passage of gas and restricts the passage of the pellet-like adsorbent.
  • the flexible fiber member 73 is typically formed into a hollow shape (bag shape) capable of accommodating a plurality of pellet-like adsorbents 72.
  • the flexible fiber member 73 may be a woven fabric or a nonwoven fabric.
  • Examples of the material for the flexible fiber member 73 include organic fibers and natural fibers, preferably polyethylene terephthalate fibers, polyethylene fibers, and cellulose fibers.
  • the thickness of the flexible fiber member 73 is, for example, 25 ⁇ m or more and 500 ⁇ m or less.
  • a plurality of pellet-like adsorbents 72 are filled inside a flexible fiber member 73 having a hollow shape (bag shape).
  • the pellet-like adsorbent 72 functions as an acidic gas adsorbent, and typically functions as a carbon dioxide adsorbent.
  • Examples of the material for the pellet adsorbent 72 include materials modified with the above acidic gas adsorbent, preferably cellulose modified with the above acidic gas adsorbent, and more preferably cellulose modified with the above acidic gas adsorbent. Examples include nanofibrous cellulose modified with acidic gas adsorbents.
  • the average primary particle diameter of the pellet-like adsorbent 72 is, for example, 60 ⁇ m or more and 1200 ⁇ m or less.
  • the filling ratio of the pellet-like adsorbent 72 in the adsorbent layer 71 may be any appropriate value.
  • the illustrated acidic gas adsorption section further includes a plurality of spacers 74.
  • the spacer 74 is sandwiched between adjacent adsorbent layers 71 among the plurality of adsorbent layers 71 . This makes it possible to stably ensure the spacing between adjacent adsorbent layers.
  • the plurality of adsorbent layers 71 and the plurality of spacers 74 have an approximately 99-fold shape when viewed from a direction perpendicular to the thickness direction of the adsorbent layer 71 (the depth direction of the paper plane in FIG. 1). It is arranged so that
  • first suction part (first block 1a) and/or the second suction part (second block 2a) have the configuration shown in FIG. If the first desorption gas flow path is formed between them, the distribution distance of the desorption gas can be reduced, so that the desorption gas can flow uniformly throughout the acidic gas adsorption section, and the desorption gas can flow uniformly throughout the acidic gas adsorption section. Can maintain uniform temperature distribution. In other words, the same effects as described above can be achieved.
  • the acid gas recovery method typically includes an adsorption step and a desorption step in this order.
  • the first on-off valve 7 and the second on-off valve 8 are opened, and the acid gas adsorption unit 1, which has been adjusted to a predetermined adsorption temperature, is supplied through the inlet 64 of the case 6. , supplies a gas to be processed containing an acidic gas.
  • the target gas containing acidic gas passes through the first flow path 94a of the first adsorption section 1 and the second flow path 94b of the second adsorption section 2 in order.
  • the acidic gas adsorbent adsorbs acidic gas from a fluid containing acidic gas (typically CO 2 ).
  • the temperature (adsorption temperature) of the acidic gas adsorption part in the adsorption step is, for example, 0°C or higher, preferably 10°C or higher, and, for example, 50°C or lower, preferably 40°C or lower. In one embodiment, the adsorption temperature is the same as the ambient temperature.
  • the implementation time (adsorption time) of the adsorption step is, for example, 15 minutes or more, preferably 30 minutes or more, and is, for example, 3 hours or less, preferably 2 hours or less. When the adsorption temperature and/or adsorption time is within the above range, the acidic gas adsorbent can efficiently adsorb acidic gas.
  • the acid gas adsorption section 10 (the first adsorption section 1 and the second adsorption section 2) is heated to the adsorption temperature. heating to a higher desorption temperature. More specifically, after the first adsorption section 1 and the second adsorption section 2 are heated to the desorption temperature, they are maintained at the desorption temperature for a predetermined desorption time. As a result, the acidic gas adsorbed by the acidic gas adsorbent in the adsorption step is desorbed from the acidic gas adsorbent.
  • the desorption gas is supplied to the first desorption gas flow path 11 through the first opening 61 of the case 6 .
  • the desorption gas supplied to the first desorption gas flow path 11 flows into the first flow path 94a of the first adsorption section 1 or the second flow path 94b of the second adsorption section 2.
  • the acidic gas desorbed from the acidic gas adsorbent in the first adsorption unit 1 flows out into the second desorption gas flow path 12 together with the desorption gas passing through the first flow path 94a, and flows through the second opening 62 of the case 6. be collected through.
  • the acidic gas desorbed from the acidic gas adsorbent of the second adsorption unit 2 flows out into the third desorption gas flow path 13 together with the desorption gas passing through the second flow path 94b, and flows into the third opening 63 of the case 6. be collected through.
  • the gas recovered in the desorption step may be referred to as recovered gas.
  • the desorption gas is a recovered gas previously recovered by an acidic gas adsorption device.
  • the recovered gas By using the recovered gas as the desorption gas, it is possible to improve the acid gas concentration in the recovered gas.
  • the temperature (desorption temperature) of the acidic gas adsorption part in the desorption step is, for example, 70°C or higher, preferably 80°C or higher, and, for example, 200°C or lower, preferably 110°C or lower.
  • the implementation time of the desorption step (the desorption time during which the acidic gas adsorption part is maintained at the desorption temperature) is, for example, 1 minute or more, preferably 5 minutes or more, and for example, 1 hour or less, preferably 30 minutes or less. .
  • acidic gas can be sufficiently desorbed from the acidic gas adsorbent.
  • the desorption gas and a pressure reduction pump can be used together to suck the recovered gas.
  • the desorption gas in the desorption step, can be uniformly flowed throughout the first adsorption section and the second adsorption section, and the acidic gas can be efficiently recovered.
  • the adsorption step and the desorption step are preferably performed repeatedly in order.
  • the acid gas adsorption apparatus 100 may further include an n-th adsorption part 3 in addition to the first adsorption part 1 and the second adsorption part 2.
  • n is, for example, 3 or more and 20 or less.
  • the n-th suction section 3 is provided between the second suction section 2 and the second on-off valve 8 .
  • n-th adsorption units 3 When there is a plurality of n-th adsorption units 3, they are arranged in order on the downstream side of the second adsorption unit 2 in the passage direction of the gas to be processed.
  • the desorption gas is present between adjacent n-th adsorption units 3 among the plurality of n-th adsorption units 3, and between the n-th adsorption unit 3 located at the most downstream position and the second on-off valve 8 in the closed state.
  • a channel may be formed. Since the n-th suction section 3 has the same configuration as the first suction section, detailed explanation will be omitted.
  • the acid gas adsorption device 100 includes a third adsorption section 31 and a fourth adsorption section 32 in addition to the first adsorption section 1 and the second adsorption section 2.
  • the third adsorption section 31 is disposed at a distance from the second adsorption section 2 on the downstream side in the direction in which the gas to be processed passes.
  • the third desorption gas flow path 13 is formed between the second adsorption section 2 and the third adsorption section 31 in the direction in which the gas to be processed passes.
  • the fourth adsorption section 32 is arranged at a distance from the third adsorption section 31 on the downstream side in the passage direction of the gas to be processed.
  • the fourth desorption gas flow path 14 is formed between the third adsorption section 31 and the fourth adsorption section 32 in the direction in which the gas to be processed passes.
  • a fourth opening 66 communicating with the fourth desorption gas flow path 14 is formed in the side wall of the case 6 .
  • the case 6 further includes the fourth opening 66.
  • the fourth opening 66 will be explained in the same manner as the first opening 61 described above.
  • the fourth opening 66 is provided with a fourth valve 19, and is connected to a desorption gas supply unit (not shown) capable of supplying desorption gas via the fourth valve 19. .
  • the fourth desorption gas flow path 14 is supplied with desorption gas similarly to the first desorption gas flow path 11.
  • the fifth desorption gas flow path 15 is formed between the fourth adsorption section 32 and the second on-off valve 8 in the closed state. Furthermore, a fifth opening 67 communicating with the fifth desorption gas flow path 15 is formed in the side wall of the case 6 . In other words, the case 6 further includes the fifth opening 67. The fifth opening 67 will be explained in the same manner as the third opening 63 described above. Note that the acid gas adsorption device 100 may have a duct communicating with the fifth desorption gas flow path 15 instead of the fifth opening 67.
  • a recovery unit (not shown) is connected to the fifth opening 67 via the fifth valve 20 to recover the desorbed gas containing the acidic gas desorbed from the acidic gas adsorbent. . In the above desorption step, the recovered gas passes through the fifth desorption gas flow path 15 similarly to the second desorption gas flow path 12 . Also with such a configuration, acidic gas can be stably desorbed from the acidic gas adsorbent.
  • the desorption gas is supplied to the first desorption gas flow path 11, the second desorption gas flow path 12, and the third desorption gas flow path 11.
  • the recovered gas passes through the gas flow path 13 .
  • the desorption gas may be supplied to the second desorption gas flow path 12 and the third desorption gas flow path 13, and the recovery gas may pass through the first desorption gas flow path 11.
  • a desorption gas supply unit (not shown) is connected to the second opening 62 and the third opening 63, and a recovery unit (not shown) is connected to the first opening 61. Also with such a configuration, acidic gas can be stably desorbed from the acidic gas adsorbent.
  • the acid gas adsorption device is used to separate and recover acid gas, and can be particularly suitably used in a carbon dioxide capture, utilization, and storage (CCUS) cycle.
  • CCUS carbon dioxide capture, utilization, and storage

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PCT/JP2023/031209 2022-09-01 2023-08-29 酸性ガス吸着装置 Ceased WO2024048579A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP23860341.9A EP4582169A1 (en) 2022-09-01 2023-08-29 Acidic gas adsorption device
AU2023334314A AU2023334314A1 (en) 2022-09-01 2023-08-29 Acidic gas adsorption device
CN202380056422.8A CN119789899A (zh) 2022-09-01 2023-08-29 酸性气体吸附装置
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WO2025192666A1 (ja) * 2024-03-13 2025-09-18 日本碍子株式会社 ハニカム構造体
WO2026009523A1 (ja) * 2024-07-01 2026-01-08 日本碍子株式会社 ガス回収装置

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JPH05222A (ja) * 1991-06-26 1993-01-08 Matsushita Electric Ind Co Ltd 吸着材再生装置
JPH06339612A (ja) * 1993-02-25 1994-12-13 Boc Group Plc:The 精製方法及びその装置
JP2011163181A (ja) * 2010-02-08 2011-08-25 Toyota Motor Corp 通路切換バルブおよび排気浄化装置
WO2014170184A1 (en) 2013-04-18 2014-10-23 Climeworks Ag Low-pressure drop structure of particle adsorbent bed for adsorption gas separation process
JP2014530093A (ja) * 2011-09-15 2014-11-17 コーニング インコーポレイテッド Ｃｏ２捕捉のための収着剤基体およびその形成方法
JP2015511887A (ja) * 2012-03-14 2015-04-23 コーニング インコーポレイテッド 二酸化炭素捕捉用セグメント型反応器およびセグメント型反応器を用いた二酸化炭素捕捉方法
JP2017104808A (ja) * 2015-12-10 2017-06-15 Ｊｆｅスチール株式会社 圧力スイング吸着法によるガス分離方法及び設備

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JPH05222A (ja) * 1991-06-26 1993-01-08 Matsushita Electric Ind Co Ltd 吸着材再生装置
JPH06339612A (ja) * 1993-02-25 1994-12-13 Boc Group Plc:The 精製方法及びその装置
JP2011163181A (ja) * 2010-02-08 2011-08-25 Toyota Motor Corp 通路切換バルブおよび排気浄化装置
JP2014530093A (ja) * 2011-09-15 2014-11-17 コーニング インコーポレイテッド Ｃｏ２捕捉のための収着剤基体およびその形成方法
JP2015511887A (ja) * 2012-03-14 2015-04-23 コーニング インコーポレイテッド 二酸化炭素捕捉用セグメント型反応器およびセグメント型反応器を用いた二酸化炭素捕捉方法
WO2014170184A1 (en) 2013-04-18 2014-10-23 Climeworks Ag Low-pressure drop structure of particle adsorbent bed for adsorption gas separation process
JP2017104808A (ja) * 2015-12-10 2017-06-15 Ｊｆｅスチール株式会社 圧力スイング吸着法によるガス分離方法及び設備

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WO2025192666A1 (ja) * 2024-03-13 2025-09-18 日本碍子株式会社 ハニカム構造体
WO2025191759A1 (ja) * 2024-03-13 2025-09-18 日本碍子株式会社 ハニカム構造体
WO2026009523A1 (ja) * 2024-07-01 2026-01-08 日本碍子株式会社 ガス回収装置

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