Gas absorption unit, gas separation and recovery device, and gas recovery method

Abstract

The present disclosure provides a gas absorption unit in which the separation and recovery efficiency of a specific component is improved. A gas absorption unit disclosed herein comprises a gas absorber 20, an induction heating device, and a heating element 30. The heating element 30 is disposed so as to be in contact with at least a part of the gas absorber 20. Another aspect of the present disclosure provides: a gas separation and recovery device that can efficiently separate and recover a specific gas from a mixed gas and can be reduced in size; and a gas recovery method. A gas separation and recovery device 100 disclosed herein comprises: a gas absorption unit 120; an induction heating device; a vacuum pump 136 that reduces the pressure in the gas absorption unit 120; a mixed gas supply unit 110; and a discharge pipe 132 that discharges a processed gas. The gas absorption unit 120 includes a heating element that generates heat by the induction heating device, and the vacuum pump 136 is connected to the discharge pipe 132.

Description

Gas absorption unit, gas separation and recovery apparatus, and gas recovery method

[0001] This disclosure relates to a gas absorption unit. Furthermore, this disclosure relates to a gas separation and recovery apparatus and a gas recovery method for recovering a specific gas from a mixed gas containing at least two or more components. This application claims priority under Japanese Patent Application No. 2024-166784, filed on 25 September 2024, and under Japanese Patent Application No. 2025-018098, filed on 6 February 2025. The entire contents of those basic applications are incorporated herein by reference.

[0002] Exhaust gases emitted from thermal power plants, factories, automobiles, etc., contain various harmful components, and there is a need to develop materials and technologies for selectively separating and recovering them. For example, carbon dioxide (CO2) is one example of a harmful component. ２ Since carbon dioxide (CO2) is a greenhouse gas, there is a pressing need to drastically reduce its emissions. To efficiently separate and recover such components, materials comprising active substances such as gas absorbents and catalysts, and carriers that support these active substances, are used. Related technologies include Japanese Patent Application Publication No. 2014-506836 and Japanese Patent Application Publication No. 2018-187574. Furthermore, as a technology relating to an apparatus for separating and recovering such components, Japanese Patent Application Publication No. 2017-56383 is cited. Japanese Patent Application Publication No. 2017-56383 discloses a carbon dioxide recovery apparatus using steam.

[0003] Japanese Patent Application Publication No. 2014-506836, Japanese Patent Application Publication No. 2018-187574, Japanese Patent Application Publication No. 2017-56383

[0004] To efficiently separate and recover specific components from a gas, it is conceivable to increase the amount of active substance supported per carrier. Examples of such carriers include those based on honeycomb structures or nonwoven fabrics. However, these carriers have the problem that the amount of active substance supported per unit volume is small because the carrier is placed only on the surface of the base material. Technologies such as those disclosed in Japanese Patent Application Publication No. 2014-506836 and Japanese Patent Application Publication No. 2018-187574 employ a method in which specific components are adsorbed onto an active substance, and then heated gas (air) is circulated through the carrier to raise the temperature of the active substance and recover the specific components adsorbed onto the active substance. Further investigation by the present inventors has revealed that in order to improve the separation and recovery efficiency of specific components, it is necessary not only to increase the amount of active substance supported, but also to use a technology to rapidly raise the carrier temperature.

[0005] Furthermore, to improve the separation and recovery efficiency of specific components, a technology is required to rapidly raise the temperature of the gas absorption unit. When heating with steam, as described in Japanese Patent Application Publication No. 2017-56383, the heat transfer is not sufficient, and there is room for improvement. In addition, such devices require steam supply lines and purge gas supply lines, which leads to the device becoming larger.

[0006] The technology disclosed herein has been developed in view of the circumstances described above, and aims to provide a gas absorption unit with improved separation and recovery efficiency for specific components. Another aspect of the technology disclosed herein aims to provide a gas separation and recovery device that can efficiently separate and recover specific gases from a mixed gas and can be miniaturized. Yet another aspect of the technology disclosed herein aims to provide a gas recovery method that can more efficiently separate and recover specific gases from a mixed gas.

[0007] The gas absorption unit disclosed herein comprises a gas absorbent, an induction heating device, and a heating element that generates heat by the induction heating device. The gas absorbent comprises a porous resin matrix and gas-absorbing particles, the resin matrix having a three-dimensional network structure including pores, the gas-absorbing particles being arranged within the pores of the resin matrix, and the heating element being arranged in contact with at least a portion of the gas absorbent.

[0008] The gas absorber in the gas absorption unit with the above configuration comprises a porous resin matrix, and gas-absorbing particles are arranged within the pores of the resin matrix. This configuration allows for an increase in the amount of gas-absorbing particles that can be supported. Furthermore, the gas absorption unit with the above configuration includes a heating element that generates heat using an induction heating device, and the heating element is positioned to be in contact with at least a portion of the gas absorber. This allows for a rapid increase in the temperature of the gas absorber. Therefore, a gas absorption unit with improved separation and recovery efficiency of specific components can be provided.

[0009] In one preferred embodiment of the gas absorption unit disclosed herein, the heating element is arranged such that at least a portion of it is embedded in the resin matrix.

[0010] In one preferred embodiment of the gas absorption unit disclosed herein, the heating element comprises at least one of a metal or carbon.

[0011] In one preferred embodiment of the gas absorption unit disclosed herein, the heating element is arranged in an area of ​​20% or more of the resin matrix in a plan view, where the area of ​​the resin matrix is ​​100%.

[0012] In one preferred embodiment of the gas absorption unit disclosed herein, the gas absorption particles comprise a carrier particle having a plurality of mesopores and a gas absorbent, wherein the gas absorbent is disposed in the plurality of mesopores of the carrier particle.

[0013] In one preferred embodiment of the gas absorption unit disclosed herein, the carrier particles are composed of an inorganic material or an organometallic structure, wherein the inorganic material includes at least one of silica, alumina, ceria, zirconia, titania, activated carbon, and zeolite.

[0014] In one preferred embodiment of the gas absorption unit disclosed herein, the porosity of the gas absorber based on the Archimedes method is 60% or more and 90% or less.

[0015] In one preferred embodiment of the gas absorption unit disclosed herein, the thermal conductivity of the gas absorber is 0.02 W / m·K or more and 1 W / m·K or less.

[0016] In one preferred embodiment of the gas absorption unit disclosed herein, the gas absorbent is in the form of a sheet, and a plurality of the gas absorbent sheets are stacked along a predetermined arrangement direction.

[0017] In one preferred embodiment of the gas absorption unit disclosed herein, the gas absorber comprises a base portion and a protrusion extending from the surface of the base portion.

[0018] In one preferred embodiment of the gas absorption unit disclosed herein, the arrangement positions of the convex portions of the plurality of gas absorbers are substantially the same in a plan view.

[0019] In one preferred embodiment of the gas absorption unit disclosed herein, the induction heating device is positioned at at least one end of the gas absorber in the direction of arrangement.

[0020] In one preferred embodiment of the gas absorption unit disclosed herein, the induction heating device is positioned at at least one end of the gas absorber in a direction perpendicular to the arrangement direction of the gas absorber.

[0021] To achieve the above objectives, a gas separation and recovery apparatus is provided as another aspect of the technology disclosed herein. The gas separation and recovery apparatus disclosed herein is a gas separation and recovery apparatus for separating and recovering a specific gas from a mixed gas containing at least two or more components, and comprises a gas absorption unit for absorbing the specific gas, an induction heating device, a vacuum pump for reducing the pressure inside the gas absorption unit, a mixed gas supply unit for supplying the mixed gas into the gas absorption unit, and a discharge pipe for discharging the processed gas from the gas absorption unit. The gas absorption unit is equipped with a heating element that generates heat by the induction heating device, and the vacuum pump is connected to the discharge pipe.

[0022] With this configuration, the heating element is heated by the induction heating device, allowing the gas absorption unit to be quickly heated to a predetermined temperature. Therefore, specific gases can be efficiently recovered from the gas absorption unit. Furthermore, this configuration allows for miniaturization of the gas separation and recovery device.

[0023] In one preferred embodiment of the gas separation and recovery apparatus disclosed herein, the gas absorption unit comprises a plurality of heating elements, the plurality of heating elements being arranged at equal intervals while being spaced apart from each other.

[0024] In one preferred embodiment of the gas separation and recovery apparatus disclosed herein, the heating element comprises at least one of metal or carbon.

[0025] In one preferred embodiment of the gas separation and recovery apparatus disclosed herein, the gas absorption unit comprises a gas absorbent and a sheet-like gas absorbent supporting the gas absorbent, and the heating element is arranged such that at least a portion of it is in contact with the gas absorbent.

[0026] In one preferred embodiment of the gas separation and recovery apparatus disclosed herein, the heating element is arranged such that at least a portion of it is embedded in the gas absorber.

[0027] In one preferred embodiment of the gas separation and recovery apparatus disclosed herein, the gas absorbent is in the form of a sheet, and a plurality of the gas absorbent is stacked along a predetermined arrangement direction.

[0028] In one preferred embodiment of the gas separation and recovery apparatus disclosed herein, the heating elements are stacked in a direction that coincides with the predetermined arrangement direction in which the gas absorbers are stacked.

[0029] In one preferred embodiment of the gas separation and recovery apparatus disclosed herein, the gas absorber comprises a base portion and a protrusion extending from the surface of the base portion.

[0030] In one preferred embodiment of the gas separation and recovery apparatus disclosed herein, the gas absorber comprises a porous resin matrix having a three-dimensional network structure including pores, and the gas absorbent is disposed within the pores of the resin matrix.

[0031] In one preferred embodiment of the gas separation and recovery apparatus disclosed herein, the gas absorbent comprises carrier particles, the carrier particles are arranged within the pores of the resin matrix, and the gas absorbent is arranged on the surface of the carrier particles.

[0032] Furthermore, as another aspect of the technology disclosed herein, a gas recovery method is provided for recovering a specific gas from a mixed gas containing at least two or more components. Such a gas recovery method includes a mixed gas supply step of supplying the mixed gas into a gas absorption unit; a specific gas adsorption step of adsorbing the specific gas from the mixed gas onto the gas absorption unit; a residual gas discharge step of discharging the residual gas after separating the specific gas from the gas absorption unit; a gas absorption unit depressurization step of maintaining the gas absorption unit under depressurization conditions of at least 1000 Pa or less; a gas absorption unit heating step of heating the gas absorption unit by induction heating under the depressurization conditions; a specific gas separation step of separating the specific gas from the gas absorption unit; and a specific gas recovery step of recovering the specific gas from the gas absorption unit. With such a configuration, a specific gas can be separated and recovered more efficiently from a mixed gas.

[0033] In one preferred embodiment of the recovery method disclosed herein, the gas absorption unit depressurization step is started when the concentration of a specific gas contained in the residual gas reaches a predetermined concentration or higher.

[0034] Figure 1 is a schematic perspective view showing the gas absorption unit disclosed herein. Figure 2 is a schematic perspective view showing the internal structure of the gas absorption unit disclosed herein. Figure 3 is a schematic plan view showing the structure of the gas absorber according to this embodiment. Figure 4 is a schematic enlarged view showing the structure of the gas absorber according to this embodiment. Figure 5 is a diagram corresponding to Figure 1 relating to the first modification. Figure 6 is a schematic front view showing the gas absorber and heating element according to the first modification. Figure 7 is a schematic top view showing the gas absorber according to the first modification. Figure 8 is a diagram corresponding to Figure 4 relating to the first modification. Figure 9 is a diagram corresponding to Figure 2 relating to the first modification. Figure 10 is a diagram corresponding to Figure 1 relating to the second modification. Figure 11 is a schematic front view showing the gas absorber and heating element according to the second modification. Figure 12 is a schematic top view showing the gas absorber according to the second modification. Figure 13 is a diagram schematically showing the structure of the gas separation and recovery device according to this embodiment. Figure 14 is a schematic perspective view showing the structure near the gas absorption unit according to this embodiment. Figure 15 is a schematic diagram showing the structure of the gas absorption unit according to this embodiment. Figure 16 is a schematic plan view showing the structure of the gas absorber according to this embodiment. Figure 17 is a schematic enlarged plan view showing the structure of the gas absorber according to this embodiment. Figure 18 is a schematic front view showing the gas absorber according to this embodiment. Figure 19 is a flowchart illustrating the gas recovery method according to the first embodiment. Figure 20 is a flowchart illustrating the gas recovery method according to the second embodiment.

[0035] Preferred embodiments of the technology disclosed herein will be described below with reference to the drawings. Matters other than those specifically mentioned herein but necessary for implementation can be understood based on the technical content taught herein and the common technical knowledge of those skilled in the art. The technology disclosed herein can be implemented based on the content disclosed herein and the common technical knowledge of the art. In this specification, the notation "A to B" indicating a range means A or greater and B or less.

[0036] In the following drawings, components and parts that perform the same function are denoted by the same reference numerals. Also, the dimensional relationships (length, width, thickness, etc.) in each drawing do not reflect the actual dimensional relationships. The arrows X, Y, and Z in the drawings indicate three mutually orthogonal directions, with X indicating the width direction, Y indicating the longitudinal direction, and Z indicating the thickness direction (vertical direction). The directions of up, down, left, right, front, and back are represented by the arrows U, D, L, R, F, and Rr in the drawings, respectively. Here, the directions of up, down, left, right, front, and back are defined only for the sake of explanation and do not limit the content of the technology disclosed herein unless otherwise specified.

[0037] <Gas Absorption Unit> The first technology disclosed herein will be described below as a gas absorption unit. Figure 1 is a schematic perspective view of the gas absorption unit 1 disclosed herein. Figure 2 is a schematic perspective view of the internal structure of the gas absorption unit 1 disclosed herein. In Figure 1, the direction of gas flow is indicated by a white arrow. In Figure 2, the frame 10 is not shown. In Figures 1 and 2, the heating element 30 is shown by a dashed line. The gas absorption unit 1 according to this embodiment is characterized by comprising a gas absorber 20, a heating element 30, and an induction heating device 40. In this embodiment, the gas absorption unit 1 further comprises a frame 10.

[0038] The gas absorption unit disclosed herein is configured to absorb, for example, a gas (component) to be recovered from a mixed gas containing multiple types of gases. Examples of mixed gases include air, exhaust gas, flue gas, biogas, gases generated in the cement manufacturing process, gases generated in the iron and steel manufacturing process and / or the manufacturing process of steel products. The gases to be absorbed by the gas absorption unit disclosed herein may include, for example, various acidic gases, various basic gases, carbon monoxide, oxygen, nitrogen, hydrogen, etc.

[0039] Examples of acidic gases include carbon dioxide (CO2). ２ ), hydrogen sulfide (H ２ S), carbon disulfide (CS) ２ ), carbonyl sulfide (COS), mercaptan (R-SH, where "R" is an alkyl group having 1 to 20 carbon atoms), sulfur dioxide (SO２ Examples of basic gases include monomethylamine, monoethylamine, dimethylamine, methylethylamine, diethylamine, and ammonia. The type of gas to be absorbed is not particularly limited, as long as there are gas-absorbing particles or gas absorbents for that gas.

[0040] As shown in Figure 1, in this embodiment, a plurality of sheet-like gas absorbers 20 and heating elements 30 are stacked in a predetermined arrangement direction (the Z-axis direction in this embodiment) and held by a frame 10. As shown in Figure 1, a pair of openings 10h are formed at both ends of the frame 10. The pair of openings 10h serve as gas vents. In other words, when the gas absorption unit is in use, gas flows in from one opening 10h and is discharged from the other opening 10h. In this embodiment, the frame 10 has a flattened, bottomed rectangular parallelepiped shape. However, the external shape of the frame 10 is not particularly limited and can be appropriately changed depending on the shape of the gas absorber 20 and the device to which it is applied, for example, it can be cylindrical, cubic, polygonal columnar, etc.

[0041] The arrangement direction of the gas absorbers 20 is not particularly limited, but it is preferable that the gas absorbers 20 be stacked in a direction substantially perpendicular to the gas flow direction (white arrow in Figure 1). This reduces pressure loss when gas flows in. Also, although not limited to this, it is preferable that the gas absorbers 20 be stacked so that gaps are formed between them. As shown in Figures 1 and 2, in this embodiment, multiple gas absorbers 20 are stacked so that gaps are formed between them. This creates a space S between adjacent gas absorbers 20. This space S serves as a gas flow path when gas is introduced into the gas absorption unit 1. However, it is not limited to this, and the multiple gas absorbers 20 may be stacked so that they are in contact with each other. Also, the method of holding the gas absorbers 20 is not limited to the frame 10, and for example, the multiple gas absorbers 20 may be fixed with an adhesive. Examples of adhesives that can be used include water-based adhesives, urea resin-based adhesives, melamine resin-based adhesives, phenol resin-based adhesives, resorcinol resin-based adhesives, water-based polymer-isocyanate-based adhesives, vinyl acetate resin-based adhesives, emulsion-type adhesives, solvent-based adhesives, chloroprene rubber-based adhesives, chemical reaction-based adhesives, epoxy resin-based adhesives, urethane resin-based adhesives, modified silicone-based adhesives, and hot-melt adhesives.

[0042] The material used to construct the frame 10 is not particularly limited, but for example, iron, stainless steel, etc., can be used. When the induction heating device 40 is placed on the outside of the frame 10, it is preferable to use a material that generates heat when heated by the induction heating device 40.

[0043] <Gas Absorber> Figure 3 is a schematic plan view showing the structure of the gas absorber 20 according to this embodiment. Figure 4 is a schematic enlarged view showing the structure of the gas absorber 20 according to this embodiment. In Figures 3 and 4, the heating element 30 is shown by a dashed line. In Figure 3, the gas absorbing particles 26 are not shown. As shown in Figure 4, the gas absorber 20 according to this embodiment includes a resin matrix 22 and gas absorbing particles 26.

[0044] The gas absorber 20 can be molded into a sheet, a rectangular parallelepiped, a cube, a prismatic shape, a cylindrical shape, a spherical shape, or the like. Although not particularly limited, the gas absorber 20 is preferably a carrier sheet molded into a sheet shape. When the gas absorber 20 is in the form of a sheet, for example, it is preferable that its thickness is 0.02 mm or more and 15 mm or less.

[0045] The resin matrix 22 contained in the gas absorber 20 disclosed herein has a porous structure having pores 24, as shown in Figure 4. The resin matrix 22 may function as a framework in the gas absorber 20. The resin matrix 22 may be composed, for example, by bonding resin crystalline particles together. The pores 24 may be communicating pores that communicate with each other. A plurality of gas-absorbing particles 26 are arranged within the pores 24. Preferably, the gas-absorbing particles 26 are mainly separated from the resin matrix 22 and present in the pores 24, and more preferably, the majority are separated from the resin matrix 22 and present in the pores 24. The gas-absorbing particles 26 are particles that absorb a specific gas to be recovered, as will be described later. The presence of a resin matrix 22 and gas-absorbing particles 26 in the gas absorber 20 can be confirmed, for example, by observing the surface or cross-section of the gas absorber 20 with a scanning electron microscope (SEM).

[0046] The gas absorber 20 disclosed herein has gas-absorbing particles 26 arranged in the pores 24 of the resin matrix 22. This allows for the support of more gas-absorbing particles and gas absorbent than conventional materials. Therefore, the amount of gas-absorbing particles (gas absorbent) per unit volume increases, improving the recovery and separation performance of the target gas. Furthermore, the gas absorber 20 has a three-dimensional mesh structure, which provides excellent gas diffusion. This facilitates the flow of gas (air). With a gas absorber 20 having such a configuration, when gas (air) is flowed in the thickness direction of the gas absorber 20, the gas (air) reaches the gas-absorbing particles 26 arranged inside the gas absorber 20, improving the separation and recovery efficiency of the target gas.

[0047] Although not particularly limited, the porosity of the gas absorber 20 disclosed herein based on the Archimedes' method is preferably 60% or more, more preferably 65% or more, and particularly preferably 70% or more. Thereby, the gas and the gas absorption particles or the gas absorbent can be preferably brought into contact with each other. On the other hand, since air has a low thermal conductivity, the lower the porosity of the gas absorber 20, the higher the thermal conductivity of the gas absorber 20. From this, the porosity of the gas absorber 20 based on the Archimedes' method is preferably, for example, 90% or less, and may be 86% or less. The "porosity of the gas absorber" can be calculated based on the Archimedes' method. More specifically, the dry weight W Ａｉｒ of the gas absorber, the weight W Ａｑ in water, and the water-containing weight W ａ＋ｗ are measured, and the porosity (P) can be calculated based on the following formula (1). P (%) = (W ａ＋ｗ - W Ａｉｒ ) / (W ａ＋ｗ - W Ａｑ ) × 100... (1)

[0048] Although not particularly limited, the water absorption rate of the gas absorber 20 disclosed herein based on the Archimedes' method is preferably 140% or more, more preferably 160% or more, still more preferably 170% or more, and may be 190% or more, or may be 200% or more. Typically, the higher the water absorption rate of the gas absorber 20, the higher the loading amount of the gas absorption particles or the gas absorbent per unit volume, and the separation and recovery performance of the gas to be recovered can be improved. From such a viewpoint, a higher water absorption rate is preferable, and the upper limit value is not particularly limited. For example, the water absorption rate of the gas absorber 20 based on the Archimedes' method may be 400% or less, may be 370% or less, or may be 350% or less. The "water absorption rate of the gas absorber" can be calculated based on the Archimedes' method. More specifically, the dry weight W Ａｉｒ of the gas absorber, the weight W Ａｑ in water, and the water-containing weight W ａ＋ｗ are measured, and the water absorption rate (Aw) can be calculated based on the following formula (2). Aw (%) = (W ａ＋ｗ - W Ａｉｒ ) / WＡｉｒ ×10...(2)

[0049] While not particularly limited, the gas absorber 20 preferably has high resistance to hot water. The heat resistance of the gas absorber 20 is preferably 120°C or higher, more preferably 140°C or higher, and may be 150°C or higher, or even 160°C or higher. This allows the gas absorber 20 disclosed herein to be suitably used even in environments exceeding 100°C or in relatively humid environments. The heat resistance of the gas absorber 20 is preferably, for example, 250°C or lower, and may be 200°C or lower. The "heat resistance of the gas absorber" can be evaluated by drying the gas absorber immersed in hot water in an autoclave and measuring its strength by a conventionally known tensile test.

[0050] While not particularly limited, the thermal conductivity of the gas absorber 20 is preferably 0.02 W / m·K or higher, more preferably 0.04 W / m·K or higher, and even more preferably 0.06 W / m·K or higher, from the viewpoint of rapidly desorbing the gas to be recovered. On the other hand, the upper limit of the thermal conductivity of the gas absorber 20 is not particularly limited, but from the viewpoint of increasing the porosity of the gas absorber, it is preferably 1 W / m·K or lower, more preferably 0.8 W / m·K or lower, and even more preferably 0.6 W / m·K or lower. The "thermal conductivity of the gas absorber" can be obtained by measuring the thermal conductivity in the thickness direction of the gas absorber using the protective hot plate method (GHP method) in accordance with JIS A 1412-1:2016.

[0051] The resin matrix 22 is a porous body containing a plurality of pores 24. The average pore diameter A of the resin matrix 22 is preferably 0.4 μm or more, more preferably 0.5 μm or more, even more preferably 0.6 μm or more, and may be 1 μm or more. This allows the gas-absorbing particles 26 to be suitably supported on the gas absorber 20. If the average pore diameter A of the resin matrix 22 is too large, the gas-absorbing particles 26 may detach from the resin matrix 22. From this viewpoint, the average pore diameter A of the resin matrix 22 is preferably, for example, 10 μm or less, more preferably 7 μm or less, and even more preferably 5 μm or less. The "average pore diameter of the resin matrix" can be determined by a mercury intrusion method using a commercially available mercury porosimeter.

[0052] The resin matrix 22 contains a resin, and may be constructed by bonding crystalline particles of the resin. Although not particularly limited, the resin matrix 22 preferably contains a resin having a glass transition temperature (Tg) of 70°C or higher. This improves the heat resistance of the gas absorber 20. The glass transition temperature of the resin contained in the resin matrix 22 is preferably 70°C or higher, but may also be 100°C or higher, or 120°C or higher. The glass transition temperature of the resin contained in the resin matrix 22 may be, for example, 260°C or lower, or 250°C or lower. The "glass transition temperature of the resin" can be measured according to conventionally known differential scanning calorimetry (DSC) measurement or dynamic viscoelasticity measurement (DMA method).

[0053] Furthermore, although not particularly limited, the resin matrix 22 preferably contains a resin with high heat water resistance. This can improve the heat water resistance of the gas absorber 20. The heat water resistance of the resin contained in the resin matrix 22 is preferably 120°C or higher, more preferably 140°C or higher, and may be 150°C or higher, or 160°C or higher. The heat water resistance of the resin contained in the resin matrix 22 is preferably, for example, 300°C or lower, may be 250°C or lower, or 200°C or lower. In this specification, "heat water resistance of the resin" can be taken from the temperature measured by load deflection in accordance with JIS K 7191-2:2015.

[0054] The resin content is not particularly limited, but is preferably 5% to 50% by mass, more preferably 10% to 45% by mass, and even more preferably 20% to 40% by mass, when the total mass of the gas absorber 20 is taken as 100% by mass. This allows for a favorable improvement in the water absorption of the gas absorber 20.

[0055] While not particularly limited, the resin components included in the resin matrix 22 include acrylic resins, cellulose resins, and resins classified as super engineering plastics. The resin matrix 22 may contain one of the above-mentioned resins alone, or it may contain a combination of two or more of them.

[0056] Acrylic resins include, for example, polymers containing alkyl (meth)acrylate as a constituent monomer component and derivatives thereof. In this specification, "(meth)acrylate" is used as a term that comprehensively means acrylate and / or methacrylate. Examples of acrylic resins include polymers containing alkyl (meth)acrylate as a main monomer (a component accounting for 50% or more by mass of the total monomer) and copolymers containing this main monomer and a secondary monomer copolymerizable with the main monomer. Examples of acrylic resins include poly(meth)acrylic acid, poly(meth)acrylamide, and polymethyl methacrylate (PMMA). Among these, the acrylic resin used in the resin matrix 22 preferably contains methacrylic acid and / or PMMA.

[0057] Cellulose resins include, for example, all compounds derived from cellulose (cellulose derivatives). Examples of cellulose resins include ethylcellulose (EC), hydroxyethylcellulose (HEC), ethylmethylcellulose (EMC), hydroxyethylmethylcellulose (HEMC), nitrocellulose, and diacetylcellulose. Among these, the cellulose resin used in the resin matrix 22 preferably contains ethylcellulose.

[0058] Super engineering plastics are resins characterized by, for example, excellent heat resistance and excellent mechanical strength. Examples of super engineering plastics include fluorine-based resins such as polytetrafluoroethylene (PTFE), tetrafluoroethylene perfluorovinyl ether copolymer (PFA), tetrafluoroethylene hexafluoropropylene copolymer (FEP), chlorotrifluoroethylene homopolymer (PCTFE), ethylene tetrafluoroethylene copolymer (ETFE), ethylene chlorotrifluoroethylene copolymer (ECTFE), and vinylidene fluoride homopolymer (PVDF); thermoplastic polyimides such as polybenzimidazole (PBI), polyimide (PI), polyetherimide (PEI), and polyamideimide (PAI); and polyethersulfone (PES), polyetheretherketone (PEEK), polyphenylene sulfide (PPS), PSU (polysulfone), and polyphenylsulfone (PPSU). The super engineering plastic used in the resin matrix 22 preferably contains PEI, PES, PVDF, PSU, PPSU, etc.

[0059] The gas-absorbing particles 26 are particles that absorb a specific gas to be recovered. The gas-absorbing particles 26 may absorb the specific gas to be recovered by themselves. Alternatively, the gas-absorbing particles 26 may be in a form that carries a gas absorbent, and the specific gas may be absorbed by the gas absorbent. In other words, the gas-absorbing particles 26 disclosed herein encompass both forms that include a gas absorbent and forms that do not include a gas absorbent (in other words, the gas-absorbing particles themselves have a gas-absorbing function).

[0060] The shape of the gas-absorbing particles 26 is not particularly limited and may be spherical or non-spherical. Examples of non-spherical gas-absorbing particles 26 include plate-like, flaky, or irregularly shaped particles.

[0061] When spherical gas-absorbing particles 26 are used, the aspect ratio of the gas-absorbing particles 26 is preferably 1.2 or less, more preferably 1.15 or less, and particularly preferably 1.1 or less. This allows for more stable absorption of the specific gas to be recovered. On the other hand, when non-spherical gas-absorbing particles 26 are used, the aspect ratio of the gas-absorbing particles 26 is preferably 1.3 or more, more preferably 1.5 or more, even more preferably 1.7 or more, and particularly preferably 2 or more. Using gas-absorbing particles 26 with such high aspect ratios allows for a suitable increase in the specific surface area of ​​the gas-absorbing particles 26, and thus a suitable improvement in the adsorption efficiency of the gas components to be recovered. On the other hand, from the viewpoint of absorption stability of the specific gas to be absorbed and productivity of the gas-absorbing particles, the upper limit of the aspect ratio of non-spherical gas-absorbing particles 26 is preferably 5 or less, more preferably 4 or less, and particularly preferably 3 or less. Furthermore, the gas-absorbing particles 26 may be in the form of a so-called mixed powder, which is a mixture of spherical and non-spherical particles.

[0062] The type of particles used for the gas-absorbing particles 26 is not particularly limited and can be appropriately selected depending on the type of gas to be recovered. The gas-absorbing particles 26 may be composed of, for example, an inorganic material or an organometallic frame (MOF: Metal Organic Frameworks). When the gas-absorbing particles 26 are composed of an inorganic material, examples of inorganic materials that can be used include zeolite, carbon, activated carbon, glass, clay minerals, diatomaceous earth, etc. The inorganic material may be any one of the above-mentioned inorganic materials alone, or it may be a combination of two or more types.

[0063] The average particle size of the gas-absorbing particles 26 is not particularly limited, but may be, for example, about 0.1 μm to 20 μm. If the average particle size of the gas-absorbing particles 26 is too small, the gas-absorbing particles 26 tend to be difficult to disperse in the gas absorber 20. From this viewpoint, the average particle size of the gas-absorbing particles 26 may be, for example, 0.1 μm or more, 1 μm or more, 3 μm or more, or 5 μm or more. On the other hand, if the average particle size is too large, the time it takes for the gas to reach the inside of the gas-absorbing particles 26 increases. From this viewpoint, the average particle size of the gas-absorbing particles 26 may be, for example, 10 μm or less, 7 μm or less, or 5 μm or less. In this specification, "average particle size of gas-absorbing particles" refers to the arithmetic mean of the equivalent circle diameter measured based on optical microscope observation. Here, the equivalent circle diameter refers to the diameter of a circle having the same area as the ellipse formed by the longest diameter of the gas-absorbing particles observed in a microscope image (the major axis) and the longest diameter of the line intersecting the major axis at a right angle (the minor axis). In this specification, the average particle size of porous particles refers to the arithmetic mean of the equivalent circle diameters of 200 randomly selected gas-absorbing particles.

[0064] From the viewpoint of increasing the contact area between the gas-absorbing particles 26 and the gas to be recovered, it is preferable that the specific surface area of ​​the gas-absorbing particles 26 is large. Although not particularly limited, the specific surface area of ​​the gas-absorbing particles 26 measured by the BET method (BET specific surface area) is, for example, 70 m². ２ / g or more 500m ２ It is preferable that it be less than or equal to 150m ２ / g or more 400m ２ It is more preferable that the amount is less than or equal to / g. In this specification, the "BET specific surface area of ​​the gas-absorbing particles" can be measured by the nitrogen adsorption method using a commercially available specific surface area measuring device.

[0065] The content of gas-absorbing particles 26 is not particularly limited, but is preferably 5% to 35% by mass, more preferably 8% to 30% by mass, even more preferably 10% to 25% by mass, and may be 13% to 20% by mass, when the total mass of the gas absorber 20 is taken as 100% by mass. This allows for a favorable improvement in the adsorption efficiency of the gas to be recovered.

[0066] As shown in Figure 4, the gas-absorbing particles 26 according to this embodiment have a plurality of pores 26p. Although not limited to this, the gas-absorbing particles 26 are preferably porous particles having a plurality of mesopores. In other words, the gas-absorbing particles 26 may be, for example, a mesoporous material having mesopores. With such a configuration, the contact area between the gas-absorbing particles 26 and the gas to be recovered can be increased. This makes it possible to suitably improve the adsorption efficiency of the gas to be recovered. Furthermore, the gas-absorbing particles 26 in this embodiment are arranged in the pores 24 of the resin matrix 22. This allows the gas-absorbing particles 26 to exist in a state where the pores 26p of the gas-absorbing particles 26 are not crushed or filled with resin.

[0067] "Mesopore" refers to a pore with a diameter in the range of 2 nm to less than 50 nm, based on the IUPAC classification. Pore 26p is an example of a "mesopore." The presence of pore 26p in the gas-absorbing particle 26 can be confirmed, for example, by observing the surface or cross-section of the gas-absorbing particle 26 with a scanning electron microscope (SEM).

[0068] When the gas-absorbing particles 26 have multiple mesopores, the average pore diameter B of the gas-absorbing particles 26 is preferably, for example, 2 nm or more, more preferably 10 nm or more, and even more preferably 12 nm or more. This allows for suitable introduction of the gas absorbent into the pores 26p when it is supported. The average pore diameter B of the gas-absorbing particles 26 is preferably, for example, 100 nm or less, more preferably 70 nm or less, even more preferably 50 nm or less, and particularly preferably 40 nm or less. This allows for a suitable increase in the specific surface area of ​​the gas-absorbing particles 26, and thus a suitable improvement in the adsorption efficiency of the gas components to be recovered. The "average pore diameter of the gas-absorbing particles" can be measured by a commercially available pore diameter distribution measuring device for the gas absorber, using a gas adsorption method based on the BJH method.

[0069] While not particularly limited, in the gas absorber 20, the ratio (A / B) of the average pore diameter A of the resin matrix 22 to the average pore diameter B of the gas absorbing particles 26 is preferably 20 or more and 200 or less, more preferably 24 or more and 165 or less, and may also be 50 or more and 120 or less. That is, the gas absorber 20 preferably has a structure that includes both relatively small pores (e.g., mesopores less than 50 nm) derived from the gas absorbing particles 26 and relatively large pores (e.g., pores of 0.5 μm or more) derived from the pores 24 of the resin matrix 22. This allows for a favorable improvement in the adsorption efficiency of the gas to be recovered by the gas absorber 20.

[0070] While not particularly limited, in the gas absorber 20, the mass ratio of the gas absorbing particles 26 to the resin constituting the resin matrix 22 is preferably, for example, 20:80 to 80:20, more preferably 30:70 to 75:25, and even more preferably 60:40 to 70:30. This allows for a suitable balance between the average pore size A derived from the resin matrix 22 and the average pore size B derived from the gas absorbing particles 26, thereby improving the adsorption efficiency of the gas to be recovered by the gas absorber 20.

[0071] The gas absorber 20 may further include thermally conductive fibers, although this is not particularly limited. This allows for a more favorable improvement in the thermal conductivity of the gas absorber 20. The thermally conductive fibers are not particularly limited, but carbon fibers, metal fibers, etc., can be used. The distribution of thermally conductive fibers in the gas absorber 20 is not particularly limited, but from the viewpoint of transferring heat throughout the gas absorber 20, it is preferable that the thermally conductive fibers are uniformly dispersed in the resin matrix 22. The length of the thermally conductive fibers is not particularly limited, but for example, it may be 100 μm or more and 10 mm or less. When the gas absorber 20 is equipped with thermally conductive fibers, the proportion of thermally conductive fibers to the entire gas absorber 20 is not particularly limited, as it can be adjusted depending on the thermally conductive fibers used and the temperature at which the gas absorber 20 is used. For example, the proportion of thermally conductive fibers to the entire gas absorber 20 may be 5% by mass or more and 30% by mass or less, when the total mass of the gas absorber 20 is 100% by mass.

[0072] <Heating element> The heating element 30 is a component that generates heat using an induction heating device 40, which will be described later. The heating element 30 is positioned so as to be in contact with at least a portion of the gas absorber 20.

[0073] When separating and recovering a specific gas using a gas absorption unit, the following method is employed. First, a mixed gas (e.g., air) is passed through the gas absorbent to adsorb the specific gas contained in the mixed gas onto the gas absorbent. This separates the specific gas from the mixed gas. Subsequently, the gas absorbent is heated to a predetermined temperature. This causes the gas to be recovered (the specific gas) adsorbed onto the gas absorbent to desorb from the gas absorbent, thereby recovering the gas. To efficiently separate and recover the gas to be recovered, it is necessary to heat the gas absorbent to a predetermined temperature quickly.

[0074] As described above, the gas absorption unit disclosed herein includes a heating element 30. The heating element 30 is characterized by being positioned in contact with the gas absorber 20. With this configuration, when the heating element 30 is heated by the induction heating device 40, the generated heat is transferred to the gas absorber 20, causing the temperature of the gas absorber 20 to rise. This allows the gas absorber 20 to be quickly heated to a predetermined temperature.

[0075] As shown in Figure 1, in this embodiment, the heating element 30 is positioned approximately in the center when viewed in the thickness direction of the gas absorber 20. However, it is not limited to this, and the heating element 30 may be positioned off-center to the upper or lower side when viewed in the thickness direction of the gas absorber 20. Also, a portion of the heating element 30 may be exposed from the surface of the resin matrix 22 (upper or lower side when viewed in the thickness direction). Preferably, at least a portion of the heating element is embedded in the gas absorber 20 (more specifically, the resin matrix 22). In other words, in some embodiments, the heating element 30 can be supported on the resin matrix 22. This ensures more reliable contact between the heating element 30 and the gas absorber 20, allowing the heating element 30 to rapidly heat the gas absorber 20.

[0076] The heating element 30 is not particularly limited as long as it generates heat using the induction heating device 40, but from the viewpoint of dielectric heating efficiency, it is preferable to include at least one of metal or carbon. Examples of the above metals include SUS, iron-chromium-aluminum alloy (kanthal wire), nickel and chromium alloy (nichrome wire), molybdenum, tungsten, platinum, tantalum, tungsten, silicon carbide, molybdenum silicide, lanthanum chromite, carbon, molybdenum disilicide, etc.

[0077] As shown in Figure 3, the heating element 30 here is a sheet-like material. The shape of the heating element 30 is not particularly limited, and a plate-like material, a mesh-like material, or a material with multiple through holes (for example, perforated metal) can be used. Among these, from the viewpoint of reducing pressure loss, it is preferable to use a mesh-like material or a material with multiple through holes as the heating element 30.

[0078] When a mesh structure is used as the heating element 30, the weaving method is not particularly limited, and known weaving methods such as plain weave, twill weave, tatami weave, and twill tatami weave can be used. The thickness of the heating element 30 is not particularly limited and may be, for example, 0.02 mm or more and 15 mm or less.

[0079] While not limited to this, when a mesh structure is used as the heating element 30, the wire diameter of the heating element 30 is preferably 0.016 mm or more, more preferably 0.02 mm or more, and even more preferably 0.03 mm or more. This allows the temperature of the gas absorber 20 to be raised appropriately. On the other hand, from the viewpoint of ensuring a sufficient flow path for gas (air) and from the viewpoint of more efficiently bringing the gas-absorbing particles 26 arranged inside the gas absorber 20 into contact with the gas to be recovered, the wire diameter of the heating element 30 is preferably 2 mm or less, more preferably 1.5 mm or less, and even more preferably 1 mm or less. The "wire diameter of the heating element" can be measured using a caliper or the like.

[0080] While not limited to this, when a mesh structure is used as the heating element 30, the mesh opening of the heating element 30 is preferably 0.01 mm or more, more preferably 0.015 mm or more, and even more preferably 0.02 mm or more. This suppresses obstruction of the gas (air) flow path through the gas absorber 20 and allows the gas-absorbing particles 26 placed inside the gas absorber 20 to come into contact with the gas to be recovered more efficiently. On the other hand, from the viewpoint of suitably raising the temperature of the gas absorber 20, the mesh opening of the heating element 30 is preferably 20 mm or less, more preferably 15 mm or less, and even more preferably 10 mm or less. The "mesh opening of the heating element" can be determined by first counting the number of holes in one side of the heating element over 1 inch (25.4 mm). Then, based on the obtained mesh number and wire diameter (mm), the "mesh opening of the heating element (mm) = (25.4 / mesh number) - wire diameter (mm)".

[0081] The void ratio of the heating element 30 is preferably 30% or more, more preferably 40% or more, and even more preferably 50% or more. This suppresses obstruction of the gas (air) flow path through the gas absorber 20, and allows for more efficient contact between the gas-absorbing particles 26 placed inside the gas absorber 20 and the gas to be recovered. On the other hand, from the viewpoint of suitably raising the temperature of the gas absorber 20, the void ratio of the heating element 30 is preferably 90% or less, more preferably 85% or less, and even more preferably 80% or less. Note that when a mesh structure is used as the heating element, the "void ratio of the heating element (%) = (mesh opening (mm))" ２ (Mesh opening (mm) + wire diameter (mm)) ２ It can be calculated by multiplying by 100. Furthermore, when perforated metal is used as the heating element, the porosity (%) can be calculated using a formula corresponding to the shape, diameter, pitch, and arrangement of the holes, and the resulting porosity (%) can be adopted as the "void ratio of the heating element." Since such formulas are well known to those skilled in the art, they are omitted here.

[0082] As shown in Figure 2, the gas absorption unit 1 according to this embodiment is equipped with one heating element 30 for each gas absorber 20. However, the number of heating elements provided for each gas absorber is not limited to this. In some embodiments, the gas absorption unit may be equipped with multiple (two or more) heating elements for each gas absorber, depending on the shape (thickness) of the gas absorber and the desired thermal conductivity of the gas absorber.

[0083] As shown in Figure 3, in this embodiment, the heating element 30 is arranged over the entire area of ​​the resin matrix 22 in a plan view. However, the area in which the heating element 30 is arranged is not limited to this, and the heating element 30 may be arranged in a part of the area of ​​the resin matrix 22 in a plan view. In other words, the heating element 30 may be arranged so as to be in contact with at least a part of the gas absorber 20 (resin matrix 22). Also, the heating element 30 may be arranged so as to protrude (be exposed) from the edges of the resin matrix 22 in the width direction and / or longitudinal direction. Although not limited to this, from the viewpoint of suitably raising the temperature of the gas absorber 20, it is preferable to arrange the heating element 30 in an area of ​​20% or more, and more preferable to arrange the heating element 30 in an area of ​​30% or more, when the area of ​​the resin matrix 22 in a plan view is taken as 100%.

[0084] <Induction Heating Device> The induction heating device 40 is a device that promotes heating of the heating element 30. The induction heating device 40 is connected to a power supply (not shown). When an electric current flows through the induction heating device 40 by the power supply, the heating element 30 generates heat. This allows the gas absorber 20 to be heated up rapidly. Conventional known devices can be used without limitation as the induction heating device 40.

[0085] The number of induction heating devices 40 arranged in the gas absorption unit 1 is not particularly limited; there may be one or more (two or more). The location where the induction heating devices 40 are arranged is not particularly limited, but it is preferable to arrange them at one end in the direction of arrangement of the gas absorber 20 and the heating element 30. As shown in Figure 1, in this embodiment, a total of two induction heating devices 40 are arranged, one at each end in the direction of arrangement of the gas absorber 20 and the heating element 30, and are held by the frame 10.

[0086] As shown in Figure 2, in this embodiment, the induction heating device 40 is positioned to cover the entire area of ​​the gas absorber 20 in a plan view. However, the area in which the induction heating device 40 is positioned is not limited to this, and the induction heating device 40 may be positioned in a part of the area of ​​the gas absorber 20 in a plan view. Furthermore, the induction heating device 40 may be positioned so as to protrude (be exposed) from the ends of the gas absorber 20 in the width direction and / or the longitudinal direction.

[0087] The above describes one embodiment of the technology disclosed herein. However, the above-described embodiment is not intended to limit the technology disclosed herein. Other embodiments of the technology disclosed herein will be described below.

[0088] <First Modified Example> Figure 5 is a diagram corresponding to Figure 1 relating to the first modified example. Figure 6 is a schematic front view showing the gas absorber 220 and heating element 30 relating to the first modified example. Figure 7 is a schematic top view showing the gas absorber 220 relating to the first modified example. Figure 8 is a diagram corresponding to Figure 4 relating to the first modified example. Figure 9 is a diagram corresponding to Figure 2 relating to the first modified example. In Figure 7, the heating element 30 is not shown.

[0089] As shown in Figure 5, in the first modified example, the gas absorption unit 200 includes a gas absorber 220 instead of a gas absorber 20. Also, as shown in Figure 8, in the first modified example, the gas absorption unit 200 includes gas absorbent particles 226 instead of gas absorbent particles 26. Aside from these points, the embodiment may be the same as described above, and since this has already been explained, redundant descriptions are omitted.

[0090] For example, in the embodiment described above, the gas absorber 20 was in the shape of a flat sheet. However, the shape of the gas absorber 20 is not limited to this. As shown in Figures 6 and 7, the gas absorber 220 comprises a base portion 220b and a protrusion 220p. Although not particularly limited, in some preferred embodiments, the gas absorber 220 may further comprise a plurality of protrusions 220p. Here, the protrusions 220p extend upward from the surface of the base portion 220b. Here, the base portion 220b and the protrusions 220p are integrally formed as a resin matrix 222. That is, the base portion 220b and the protrusions 220p each have pores 224, and gas absorbing particles 226 (see Figure 8) are arranged in each pore 224. In other words, the configuration of the gas absorber 220 is the same as that of the gas absorber 20 according to the above embodiment, except that it comprises a base portion 220b and protrusions 220p.

[0091] As shown in Figure 5, in the gas absorption unit 200 according to the first modified example, a plurality of gas absorbers 220 are stacked along a predetermined arrangement direction (the Z-axis direction in this embodiment). At this time, a space S is formed between adjacent gas absorbers 220 by the protrusions 220p. Furthermore, by providing protrusions 220p on the gas absorbers 220, turbulence can be generated in the gas flow. This makes it possible to further improve the contact efficiency between the gas absorbing particles 226 and the gas while reducing pressure loss.

[0092] In the first modified example, the gas absorbers 220 are stacked so that the protrusions 220p of the gas absorbers 220 are in contact with the base portions 220b of adjacent gas absorbers 220. However, the invention is not limited to this, and the gas absorbers 220 may be stacked so that the protrusions 220p of the gas absorbers 220 are in contact with the protrusions 220p of adjacent gas absorbers 220. Alternatively, the gas absorbers 220 may be stacked so that the base portions 220b of the gas absorbers 220 are in contact with the base portions 220b of adjacent gas absorbers 220. Furthermore, as shown in Figure 5, in the first modified example, the gas absorbers 220 are stacked so that the positions of the protrusions 220p of the multiple gas absorbers 220 are substantially the same in a plan view. However, the invention is not limited to this, and the gas absorbers 220 may be stacked with the positions of the protrusions 220p of the multiple gas absorbers 220 staggered in a plan view.

[0093] As shown in Figure 5, in the first modified example, the multiple protrusions 220p are spaced apart from each other and extend along a direction perpendicular to the thickness direction of the gas absorber 20 (here, the Y-axis direction) (in other words, arranged in a stripe pattern). The spacing between the multiple protrusions 220p may be equal or unequal. Also, in the first modified example, the multiple protrusions 220p are arranged on only one surface of the base portion 220b. However, the invention is not limited to this, and the multiple protrusions 220p may be further provided on the other surface of the base portion 220b. In other words, in some embodiments, the gas absorber 220 may have protrusions 220p on both sides.

[0094] As shown in Figure 6, the protrusion 220p is columnar in this case. As shown in Figure 6, the protrusion 220p has a flat surface 220A at its tip in the protruding direction. The area of ​​the flat surface 220A is preferably set to 60% to 100% of the cross-sectional area of ​​the base end 220C of the protrusion 220p. For this reason, the protrusion 220p may be tapered, with its diameter gradually decreasing in the protruding direction. In this embodiment, the base end 220C of the protrusion 220p refers to the boundary between the protrusion 220p and the base portion 220b.

[0095] In this embodiment, the total area of ​​the flat surface 220A of the protrusions 220p on the gas absorber 220 is, for example, 30% or more of the total area of ​​the surface on which the protrusions 220p are provided on the gas absorber 220. From the viewpoint of improving the thermal conductivity efficiency of the gas absorber 220, it is preferably 40% or more, more preferably 50% or more, and even more preferably 60% or more. On the other hand, from the viewpoint of improving the gas absorption performance of the gas absorber 220, the total area of ​​the flat surface 220A of the protrusions 220p on the gas absorber 220 is preferably 90% or less, more preferably 80% or less, and even more preferably 70% or less of the total area of ​​the flat surface 220A of the protrusions 220p on the gas absorber 220 is,

[0096] The height of the protrusion 220p can be adjusted as appropriate according to the size of the gas absorption unit 200 and the number of gas absorbers 220 constituting the gas absorption unit 200, and is not particularly limited. From the viewpoint of securing space S, the height H of the protrusion 220p may be, for example, 0.5 mm or more, and preferably 1 mm or more. On the other hand, from the viewpoint of gas absorption amount, the height H of the protrusion 220p may be, for example, 50 mm or less, and preferably 10 mm or less. In this specification, "height H of the protrusion 220p" means the length of the perpendicular line drawn from the apex of the protrusion 220p to the point on the base portion 220b closest to the protrusion 220p, when viewed in the thickness direction of the gas absorber 220.

[0097] Although not limited to this, the average height of the protrusions 220p of the gas absorber 220 is H ａｖｅ In this case, at least 80% of the provided protrusion 220p is 0.5H ａｖｅ ~1.5H ａｖｅ It is preferable that it has a height of 0.7H ａｖｅ ~1.3H ａｖｅIt is more preferable to include it in 0.8H ａｖｅ ~1.2H ａｖｅ It is even more preferable that it be included in 0.9H ａｖｅ ~1.1H ａｖｅ It is particularly preferable that it be included in the above. The average height H of the convex portion 220p of the gas absorber 220. ａｖｅ The smaller the variation (i.e., closer to 1), the more likely the protrusions 220p are to come into contact with adjacent gas absorbers 220 when the gas absorbers 220 are stacked. This makes the heat conduction of the gas absorbers 220 more efficient.

[0098] As shown in Figure 8, in the first modified example, the gas-absorbing particle 226 comprises a carrier particle 227 and a gas absorbent 228. The fact that the gas-absorbing particle 226 comprises a carrier particle 227 and a gas absorbent 228 can be inferred, for example, by thermogravimetric analysis (TG).

[0099] The carrier particles 227 are particles that support the gas absorbent 228. As shown in Figure 8, the carrier particles 227 have a plurality of pores 227p. Here, the carrier particles 227 are porous particles having a plurality of mesopores, and the gas absorbent 228 is disposed in the pores 227p of the carrier particles 227. The carrier particles 227 can be, for example, a mesoporous material having mesopores.

[0100] The carrier particles 227 may be any inorganic porous material capable of supporting the gas absorbent 228. For example, the carrier particles 227 are preferably porous materials with a relatively large specific surface area. The carrier particles 227 may be composed of, for example, an inorganic material or an organometallic frame (MOF). When the carrier particles 227 are composed of an inorganic material, preferably used inorganic materials include activated carbon, oxides of metalloid elements, oxides of metal elements, and their solid solutions. Examples of inorganic materials include activated carbon, silica, alumina, ceria, zirconia, titania, zeolite, etc. The inorganic material may be any one of the above-mentioned inorganic materials alone, or a combination of two or more. In particular, the carrier particles 227 preferably contain silica particles.

[0101] From the viewpoint of increasing the amount of gas absorbent 228 carried, it is preferable that the oil absorption capacity of the carrier particles 227 is high. Although not particularly limited, the oil absorption capacity of the carrier particles 227 is preferably, for example, 100 ml / 100 g or more and 400 ml / 100 g or less, and more preferably 130 ml / 100 g or more and 380 ml / 100 g or less. The "oil absorption capacity of the carrier particles" can be measured in accordance with JIS K6217-4:2008 using a general absorption capacity measuring device and DBP (dibutyl phthalate) as the reagent liquid.

[0102] Furthermore, the composition of the carrier particles 227 (aspect ratio, average particle size, specific surface area, average pore diameter, etc.) is the same as that of the gas-absorbing particles 26 described above, except for the points mentioned above. Also, the composition of the pores 227p of the carrier particles 227 is the same as that of the pores 26p of the gas-absorbing particles 26 described above, except for the points mentioned above. For this reason, explanations of these overlapping elements will be omitted.

[0103] The gas absorbent 228 is placed (supported) on the carrier particles 227. As shown in Figure 8, here the gas absorbent 228 is placed in a plurality of pores 227p of the carrier particles 227. Preferably, the gas absorbent 228 is placed, for example, in the mesopores of the carrier particles 227.

[0104] The type of gas absorbent is not particularly limited and can be appropriately determined depending on the type of gas to be absorbed. For example, if the gas to be absorbed is an acidic gas (e.g., CO ２ , H ２ Amine compounds may be preferably used as gas absorbents, such as s(S, etc.). Alternatively, if the gas to be absorbed is a basic gas, iron sulfate (FeSO4) may be used as a gas absorbent. ４ ), metaphosphate (HPO ３ ) can be used.

[0105] Amine compounds include, for example, at least one primary amino group (NH ２ － These are various compounds having ). The amine compound may contain a secondary amino group and / or a tertiary amino group in addition to the primary amino group. The amine compound may be solid or liquid at room temperature. The amine compound may have gas adsorption properties (e.g., CO２ It becomes a solid during adsorption and a solid during gas desorption (CO ２ Some amine compounds become liquid upon desorption (for example, isoholodiamines). Such amine compounds may be used as amine compounds for gas absorption.

[0106] Examples of amine compounds include amines, polyamines, and compounds having primary to tertiary amino groups such as aminoorganosilanes. Examples of amines include monoethanolamine, diethanolamine, triethanolamine, and isoholodiamine. Examples of polyamines include polyethyleneimine, polypropyleneimine, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and pentaethylenehexamine. Examples of aminoorganosilanes include (3-aminopropyl)trimethoxysilane (APTMS), N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, N-(2-aminoethyl)-3-amino-propyltriethoxysilane, N-(2-aminoethyl)-3-amino-propylmethyldimethoxysilane, 3-triethoxysilyl-N-(1,3-dimethyl-butylidene)propylamine, N-phenyl-3-aminopropyltrimethoxysilane, and N-(n-butyl)-3-aminopropyltrimethoxysilane. Furthermore, compounds with partially modified functional groups may be used as amine compounds. The amine compound may be used individually or in combination of two or more. In particular, the amine compound preferably contains polyalkylene imines such as polyethyleneimine and polypropyleneimine.

[0107] While not limited thereto, the amount of gas absorbent 228 loaded onto the gas absorber 220 is preferably 15% by mass or more and 60% by mass or less, more preferably 20% by mass or more and 56% by mass or less, even more preferably 25% by mass or more and 54% by mass or less, and particularly preferably 30% by mass or more and 52% by mass or less. The gas absorber 220 disclosed herein is not limited to a specific amount of gas absorbent 228 loaded onto it. As described above, the gas absorber 220 disclosed herein has a structure with excellent gas diffusion properties. Therefore, according to the technology disclosed herein, even when the amount of gas absorbent 228 loaded onto it is small, the adsorption performance of the gas to be recovered can be improved.

[0108] In the first modification, the gas absorbent 228 is arranged in multiple pores 227p of the carrier particles 227. However, this configuration does not limit the gas absorbent 228 to being arranged only in the pores 227p of the carrier particles 227. For example, the gas absorbent 228 may be arranged on the surface of the carrier particles 227 in addition to the pores 227p of the carrier particles 227. Alternatively, the gas absorbent 228 may be arranged on the surface and pores 224 of the resin matrix 222.

[0109] As shown in Figures 5 and 9, in the first modified example, two induction heating devices 40 are arranged, one at each end of the gas absorber 220, in a direction perpendicular to the arrangement direction of the gas absorber 220 and the heating element 230 (Z-axis direction) and in a direction perpendicular to the direction in which the opening 10h of the frame 10 is positioned (Y-axis direction) (X-axis direction), and are held by the frame 10. Although not limited to this, it is preferable that an induction heating device 40 be arranged at least at one end in the direction perpendicular to the arrangement direction of the gas absorber 220, and more preferably that induction heating devices 40 be arranged at both ends. With this configuration, the gas absorber 220 can be heated more quickly. The reason for this effect is not clear, but it is presumed that by arranging the induction heating devices 40 in a direction perpendicular to the arrangement direction of the gas absorber 220, the heating element 230 can be heated uniformly. The configuration of the induction heating device 40 is the same as that of the induction heating device 40 according to the above embodiment, except for the difference in arrangement.

[0110] The first modified example has been described above. However, the shape of the protrusion 220p is not limited thereto. For example, the protrusion 220p may extend in the X-axis direction, or it may extend in a direction intersecting the X-axis and Y-axis directions (diagonal direction). Furthermore, the shape of the protrusion 220p is not limited thereto, and may be, for example, dot-shaped, island-shaped, dashed-line-shaped, etc.

[0111] <Second Modification> Figure 10 is a diagram corresponding to Figure 1 relating to the second modification. Figure 11 is a schematic front view showing the gas absorber 320 and heating element 330 relating to the second modification. Figure 12 is a schematic top view showing the gas absorber 320 relating to the second modification. In Figure 12, the heating element 330 is not shown. In the second modification, the gas absorber 20 is replaced with the gas absorber 320, and the induction heating device 40 is replaced with the induction heating device 340. In addition, in the second modification, the gas absorption unit 300 further includes a metal plate 350. Note that other than these points, it may be the same as the above embodiment and has already been explained, so redundant descriptions are omitted.

[0112] As shown in Figure 12, in the second modified example, the multiple protrusions 320p of the gas absorber 320 are dot-shaped when viewed from above, and the multiple protrusions 320p are arranged in a staggered pattern. Even in this configuration, a space S can be formed, and turbulence can be generated in the gas flow. Also, as shown in Figures 11 and 12, the protrusions 320p are cylindrical. However, the shape of the protrusions 320p is not limited to this, and may be, for example, a triangular prism, a square prism, a polygonal prism, etc. Furthermore, the configuration of the gas absorber 320 is the same as that of the above embodiment and the gas absorbers 20 and 220 according to the first modified example, except that the arrangement of the protrusions 320p is different. In this embodiment, "the multiple protrusions 320p are arranged in a staggered pattern" means that adjacent protrusions 320p in the first direction P are offset from each other in the second direction Q, but adjacent protrusions 220p that are one position apart in the first direction P are arranged so that they are at the same position in the second direction Q. The first direction P is defined, for example, by a straight line connecting any adjacent protrusions 320p, and in Figure 12, it represents the direction from the rear to the front. The second direction Q is perpendicular to the first direction P, and in Figure 12, it represents the direction from left to right.

[0113] As shown in Figure 11, in the second modification, the heating element 330 is positioned such that a portion of the heating element 30 is exposed from the side of the base portion 320b of the gas absorber 320 where the protrusion 320p is not located. In this configuration as well, the gas absorber 320 can be heated rapidly by the heating element 330. The configuration of the heating element 330 is the same as that of the heating element 30 in the above embodiment, except for the difference in arrangement.

[0114] As shown in Figure 10, in the second modification, one induction heating device 340 is placed at one end in the direction of arrangement of the gas absorber 320 and the heating element 330. More specifically, in this case, the heating element 330 and the induction heating device 340 are placed in contact at the lower end in the direction of arrangement of the gas absorber 320 and the heating element 330.

[0115] As shown in Figure 10, in the second modified example, a metal plate 350, which is a plate-shaped metal member, is arranged at the upper end in the direction of arrangement of the gas absorber 320 and the heating element 330 so as to be in contact with the gas absorber 320 (here, the protrusion 320p). In some preferred embodiments, the gas absorption unit 300 may further include the metal plate 350. This allows the gas absorber 320 to be suitably heated.

[0116] The metal that can be used for the metal plate 350 is not particularly limited, but it is preferable to use a metal with good thermal conductivity. For example, stainless steel (SUS), iron-based, copper-based, nickel-based, titanium-based, aluminum-based, molybdenum-based, tungsten-based alloy materials and pure metal materials are preferred as such metals.

[0117] The number of metal plates 350 may be one or multiple (two or more). Furthermore, the placement of the metal plates 350 is not limited to this; for example, the metal plates 350 may be arranged so as to be interposed between the gas absorber 320. Although not limited to this, it is preferable that the metal plates 350 be arranged so as to cover the entire area of ​​the gas absorber 320 in a plan view.

[0118] <Other Embodiments> It is possible to replace some of the embodiments described above with other modifications, and it is also possible to add other modifications to the embodiments described above. Furthermore, if the technical features are not described as essential, they may be deleted as appropriate. For example, in some embodiments, the gas absorption unit may be further equipped with a heat exchange member. For example, the heat exchange member may be further interposed between the gas absorber 20 and the heating element 30. Next, the heat exchange member is connected to a heat exchange means provided externally. Then, the heat exchange member is cooled or heated via the heat exchange means. This makes it possible to bring the temperature of the gas absorber 20 to a predetermined temperature more quickly. As the heat exchange member, for example, a multi-tube heat exchanger, a plate heat exchanger, a fin-tube heat exchanger, a coil heat exchanger, a spiral heat exchanger, a jacket heat exchanger, a non-metallic heat exchanger, a spiral heat exchanger, a direct-contact heat exchanger, an air-cooled heat exchanger, a water-cooled heat exchanger, an immersion heat exchanger, etc. can be used.

[0119] <Method for Manufacturing a Gas Absorber> Next, an example of a method for manufacturing the gas absorber 20 disclosed herein will be described. The gas absorber 20 disclosed herein may include a preparation step, a molding step, an immersion step, and a first drying step. However, the gas absorber 20 disclosed herein is not limited to those manufactured by the following manufacturing method.

[0120] In the preparation step, a slurry-like composition (slurry for forming a gas absorber) containing at least gas-absorbing particles 26, a resin, and an organic solvent is prepared. In this specification, the term "slurry" is used to include forms also called "paste" and "ink."

[0121] As an example, in the preparation step, gas-absorbing particles 26 are added to an organic solvent and stirred. This disperses the gas-absorbing particles 26 in the organic solvent. Next, the resin is added to the organic solvent in which the gas-absorbing particles 26 are dispersed and stirred. This dissolves the resin in the organic solvent. Although not particularly limited, in the preparation step, it is preferable to add the gas-absorbing particles 26 and the resin to the organic solvent and stir while heating it to 40°C to 60°C. Details of the gas-absorbing particles 26 and resin prepared in the preparation step have already been explained, so redundant explanations will be omitted.

[0122] When the gas-absorbing particles 26 comprise carrier particles and a gas absorbent, gas-absorbing particles may be prepared by pre-loading (arranging) the gas absorbent on the carrier particles. Alternatively, the gas absorbent may be arranged on the carrier particles after the carrier particles have been arranged in the resin matrix. A manufacturing example in which the gas absorbent is arranged on the carrier particles after the carrier particles have been arranged in the resin matrix will be described later as a second manufacturing method.

[0123] The organic solvent is not particularly limited as long as it can dissolve the resin. Examples of organic solvents include amides such as diethylformamide, dimethylacetamide, dimethylformamide, N-methylpyrrolidone, and dimethylimidazolidinone; alkyl ketones such as dimethyl sulfoxide, acetone, and methyl ethyl ketone; ethers such as tetrahydrofuran, dioxane, and diglyme; and glycol ethers such as ethylene glycol and diethylene glycol. These may be used individually or in combination of two or more. The mass ratio of the organic solvent contained in the slurry for forming the gas absorber is not particularly limited. Preferably, the content of the organic solvent in the slurry for forming the gas absorber is, for example, 30% to 80% by mass. This allows for the production of a suitable molded product in the molding process.

[0124] Furthermore, the slurry for forming the gas absorber may contain conventionally known additives, provided that these additives do not significantly impair the effects of the technology disclosed herein. Examples of such additives include dispersants, plasticizers, defoamers, and thickeners. For example, glycerin and nonionic surfactants can be preferably used as additives. The content of additives in the slurry for forming the gas absorber is, for example, 30% by mass or less, preferably 20% by mass or less, and more preferably 10% by mass or less.

[0125] In the molding process, the molded body is formed using the gas absorber forming slurry and the heating element 30 prepared above. The heating element 30 described above can be suitably used as the heating element 30. For example, a sheet-like molded body can be produced by supplying the gas absorber forming slurry onto a metal substrate to a predetermined thickness using a squeegee. Alternatively, a molded body of a desired shape can be produced by using the doctor blade method, extruding the gas absorber forming slurry into a predetermined shape, printing on a metal plate or metal mesh, or dip coating a core material.

[0126] The position of the heating element 30 placed on the gas absorber 20 after manufacturing can be adjusted by the supply conditions of the slurry for forming the gas absorber and the timing of the placement of the heating element 30. For example, the molded body may be manufactured by supplying the slurry for forming the gas absorber onto the heating element 30. Alternatively, the molded body may be manufactured by supplying the slurry for forming the gas absorber and then placing the heating element 30 on top of the slurry.

[0127] For example, when performing the molding process using a squeegee, the following method can be used. First, the heating element 30 is placed on a metal substrate. At this time, the heating element 30 is placed so that there is a gap between the metal substrate and the heating element 30. This gap can be adjusted as appropriate according to the thickness of the gas absorber 20 to be manufactured. Next, the slurry for forming the gas absorber is supplied onto the heating element 30. Then, by squeezing the supplied slurry using a squeegee, a portion of the slurry passes through the mesh of the heating element 30 and moves between the heating element 30 and the glass substrate. As a result, at least a portion of the heating element 30 is embedded in the slurry for forming the gas absorber. At this time, the position of the heating element 30 that will be placed on the gas absorber 20 after manufacturing can be adjusted by adjusting the squeezing conditions of the squeegee (for example, the distance between the squeegee and the surface of the heating element 30, the force applied to the squeegee, etc.).

[0128] Furthermore, a gas absorber having a base portion and a protrusion as described above can be manufactured, for example, by using a metal substrate having a plurality of recesses or a metal substrate having a plurality of through holes (for example, perforated metal) as the metal substrate. By supplying a slurry for forming a gas absorber to such a metal substrate in a predetermined thickness, a gas absorber having a base portion and a protrusion can be manufactured. The number of recesses, the shape of the recesses, the number of through holes, the shape of the through holes, etc., in the metal plate used in this process can be appropriately set according to the desired number and shape of the protrusions in the gas absorber 20. In addition, conventionally known metal substrates can be used without particular limitation, for example, aluminum can be used.

[0129] In the immersion step, the molded body prepared in the molding step is immersed in an aqueous solvent (for example, water). As a result, the organic solvent contained in the molded body is replaced by the aqueous solvent, and the resin precipitates. The areas where the organic solvent contained in the molded body is replaced by the aqueous solvent become pores 24, and when the resin precipitates, the resin matrix 22 described above is suitably formed. Since the gas-absorbing particles 26 are dispersed in the organic solvent, the resin matrix 22 is formed to enclose the gas-absorbing particles 26, and the gas-absorbing particles 26 are arranged in the pores 24 of the resin matrix 22.

[0130] The aqueous solvent used in the immersion process is not particularly limited. The aqueous solvent may be, for example, water, a mixed solution of water and alcohol, or water with a surfactant added. Deionized water, pure water, ultrapure water, distilled water, etc., can be preferably used as the aqueous solvent. The immersion time of the molded body in the immersion process is, for example, two hours or more. The temperature conditions for the immersion process are, for example, cold (around 10°C).

[0131] In the first drying step, the molded body after the immersion step is dried. This removes the aqueous solvent from the molded body. This makes it possible to produce a gas absorber 20 comprising a resin matrix 22 and gas-absorbing particles 26. The drying means in the first drying step is not particularly limited, and for example, a hot air dryer, a low-humidity air dryer, a vacuum dryer, various infrared dryers, electromagnetic induction dryers, microwave dryers, dry air, etc., or drying acceleration means such as blowing air, reducing pressure, and heating can be used alone or in combination. The drying temperature in the first drying step (setting temperature of the drying device, etc.) can be appropriately selected depending on the type and amount of solvent in the mixture, but for example, it can be set to 40°C to 120°C, preferably 60°C to 100°C. The drying time in the first drying step can also be appropriately selected depending on the type and amount of aqueous solvent. Therefore, the drying time in the first drying step is not particularly limited. The drying time can be appropriately set depending on the type and amount of solvent in the mixture, etc., but is generally 30 minutes to 24 hours, and preferably 1 hour to 10 hours.

[0132] <Second Manufacturing Method> Next, a second manufacturing method for the gas absorber disclosed herein will be described. The second manufacturing method may include a preparation step, a molding step, an immersion step, a first drying step, a second drying step, an introduction step, and a third drying step. Each step will be described below.

[0133] In the preparation step, a slurry-like composition (slurry for gas absorber formation) containing at least carrier particles, a resin, and an organic solvent is prepared. The preparation step for the second manufacturing method may be the same as the preparation step for the manufacturing method described above, except that carrier particles are used.

[0134] In the second manufacturing method, a precursor for a gas absorber comprising a resin matrix, carrier particles, and a heating element can be obtained by going through a molding step, an immersion step, and a first drying step. In this specification, "precursor for gas absorber" refers to a gas absorber before the gas absorbent is placed on it. The molding step, immersion step, and first drying step in the second manufacturing method can be carried out by the same operations as in the manufacturing method described above. Therefore, redundant explanations are omitted here.

[0135] In the second drying step, the gas absorber precursor obtained in the first drying step is dried. This removes moisture from the gas absorber precursor. This allows more gas absorbent to be supported on the carrier particles in the introduction step described later. There is no intention to limit the technology disclosed herein, but the reason why such an effect is obtained is presumed to be as follows: Because the carrier particles of the gas absorber precursor have pores, they easily absorb moisture from the air. Carrier particles that have absorbed moisture from the air have moisture trapped inside their pores. Therefore, by performing the second drying step, the moisture inside the pores of the carrier particles is removed. This is thought to make it easier for the gas absorbent to be placed inside the pores of the carrier particles.

[0136] The drying method in the second drying step is not particularly limited, and the same method as in the first drying step can be used. Among these, drying by vacuum drying is preferred from the viewpoint of effectively removing moisture. The drying temperature in the second drying step (setting temperature of the drying apparatus, etc.) can be set to, for example, 60°C to 120°C, preferably 70°C to 100°C. The drying time is also not particularly limited, but is generally 1 to 6 hours, and preferably 2 to 3 hours.

[0137] As mentioned above, the carrier particles are porous and therefore have a tendency to absorb moisture from the air. For this reason, although not limited to this, it is preferable to perform the second drying step immediately before carrying out the introduction step described later.

[0138] The introduction step involves introducing the gas absorbent into the pores of the carrier particles after the second drying step. By performing the introduction step, the gas absorbent is introduced into the pores of the carrier particles. The gas absorbent can also be introduced into the pores of the surface of the carrier particles and the resin matrix. The method of introducing the gas absorbent is not particularly limited, and a method appropriate to the type of gas absorbent can be adopted. For example, if the gas absorbent is an amine compound, the amine compound can be introduced by preparing a solution in which the amine compound is dissolved in an organic solvent (e.g., a lower alcohol such as ethanol), and immersing the gas absorbent precursor in this solution. Alternatively, the amine compound may be introduced into the gas absorbent precursor by placing it in an atmosphere in which the amine compound is in the gas phase.

[0139] While not particularly limited, the amount of gas absorbent (e.g., an amine compound) introduced into the molded body during the introduction process is preferably about 20 to 60 parts by mass per 100 parts by mass of the gas absorbent precursor after the second drying process.

[0140] The third drying step is, for example, a step of drying the gas absorber precursor after the introduction step. By performing the third drying step, for example, the organic solvent used in the introduction step can be removed from the gas absorber precursor after the immersion step. This makes it possible to obtain a gas absorber having the above-described structure. As the drying means used in the third drying step, for example, the means used in the first drying step and the second drying step may be used. The drying temperature of the third drying step (setting temperature of the drying apparatus, etc.) can be set appropriately depending on the type and amount of solvent in the mixture, but is generally 60°C to 150°C, and preferably 80°C to 120°C. The drying time can be set appropriately depending on the type and amount of solvent in the mixture, but is generally 30 minutes to 24 hours, and preferably 1 hour to 10 hours.

[0141] In this way, a gas absorber 20 with a heating element 30 having the configuration according to the above embodiment can be manufactured. Next, the gas absorber 20 and the heating element 30 obtained can be stacked in a frame 10, and an induction heating device can be placed inside to manufacture a gas absorption unit 1.

[0142] As described above, a gas absorption unit 1 with improved separation and recovery efficiency of the gas to be recovered can be manufactured. Such a gas absorption unit 1 can be suitably used in direct air recovery (DAC) devices, hydrogen recovery devices, volatile organic compound (VOC) recovery devices, incineration exhaust gas recovery devices, automobile exhaust gas recovery devices, wastewater oil recovery devices, fluorine recovery devices, boron recovery devices, arsenic recovery devices, selenium recovery devices, phosphorus recovery devices, organofluorine compound (PFAS) recovery devices, colloid recovery devices, metal recovery devices, organometallic recovery devices, metal ion recovery devices, sludge recovery devices, chemical activator recovery devices, radioactive material recovery devices, and the like.

[0143] <Test Examples> Below, we will describe test examples relating to the first technology disclosed herein, but this is not intended to limit the technology disclosed herein to these test examples.

[0144] <Fabrication of gas absorbers> (Example 1) First, porous silica particles (SiO₂) are used as carrier particles. ２135 g of (average particle size 9 μm), 80 g of polysulfone (PSU) as a resin, 330 g of dimethyl sulfoxide (DMSO) as an organic solvent, and 35 g of glycerin as an additive were prepared. This prepared the slurry for forming the gas absorber of Example 1. Next, a heating element was placed on a flat aluminum metal substrate so that it was in full contact with the substrate. The slurry for forming the gas absorber of Example 1 was then applied to the heating element so that the total thickness was 2 mm (base thickness 1 mm, height of convex part 1 mm). After that, the slurry for forming the gas absorber was squeezed using a squeegee on the metal substrate and the heating element at a speed of 200 mm / min. This obtained a sheet-like molded body. The sheet-like molded body was immersed in water for 24 hours. Then, by drying the molded body after immersion in water at 80°C for 5 hours, a precursor for a gas absorber was obtained, comprising a molded body formed into a flat sheet and a heating element embedded approximately at the center of the thickness direction of the molded body, as in Example 1. The heating element in Example 1 used a plain weave metal mesh with the following configuration: Material: SUS304; Mesh count: 60; Wire diameter: 0.14 mm; Mesh opening: 0.283 mm; Void ratio: 44.4%

[0145] (Example 2) In Example 2, a slurry for forming a gas absorber was directly applied to a metal substrate similar to that in Example 1, and then the slurry was squeezed. After that, a heating element was placed on the squeezed slurry to obtain a molded body. Everything else was the same as in Example 1. In this way, a molded body formed in the shape of a flat sheet and a precursor of a gas absorber equipped with a heating element according to Example 2, in which the heating element is placed on one surface of the molded body, were obtained.

[0146] (Example 3) In Example 3, the procedure was the same as in Example 1, except that a metal substrate with slits was used instead of the metal substrate in Example 1. This resulted in a precursor for a gas absorber comprising a molded body having a base portion, a protrusion extending from one surface of the base portion and arranged to extend in a direction perpendicular to the thickness direction of the base portion (hereinafter referred to as "striped"), and a heating element according to Example 3, in which the heating element is embedded approximately at the center of the thickness direction of the molded body.

[0147] (Example 4) In Example 4, the process was the same as in Example 2, except that the metal plate in Example 2 was replaced with the metal substrate in Example 3. This resulted in obtaining a precursor for a gas absorber comprising a base portion, a molded body having protrusions extending from one surface of the base portion and arranged in a stripe pattern, and a heating element in which the heating element is placed on the other surface of the base portion (the surface without the protrusions) according to Example 4.

[0148] (Example 5) In Example 5, the process was the same as in Example 1, except that a perforated aluminum metal with staggered through-holes was used instead of the metal substrate in Example 2. This resulted in a precursor for a gas absorber comprising a base portion, a molded body having protrusions extending from one surface of the base portion and arranged in a staggered pattern, and a heating element embedded approximately at the center of the thickness direction of the molded body, as in Example 5.

[0149] (Example 6) Example 6 was the same as Example 2 except that the perforated metal according to Example 5 was used instead of the metal plate according to Example 2. As a result, a precursor for a gas absorber according to Example 6 was obtained, comprising a base portion, a molded body having protrusions extending from one surface of the base portion and arranged in a staggered pattern, and a heating element arranged on the other surface of the base portion (the surface without the protrusions).

[0150] (Examples 7 to 12) Here, one more precursor of the gas absorber equipped with the heating element according to Examples 1 to 6 was prepared. These precursors of the gas absorber equipped with the heating element according to Examples 1 to 6 were designated as Examples 7 to 12, respectively.

[0151] (Reference Example) Here, a gas absorber sample was prepared to evaluate the porosity and thermal conductivity of a gas absorber made using the gas absorber forming slurry of the main test examples (Examples 1 to 12). Specifically, a gas absorber forming slurry similar to that in Example 1 was prepared, and the gas absorber forming slurry was applied to a glass substrate to a thickness of 2 mm on a flat aluminum metal substrate. No heating element was placed. This resulted in a reference example gas absorber formed in a sheet shape.

[0152] <Measurement of Thermal Conductivity> The thermal conductivity (W / m·K) in the thickness direction of the gas absorber in the reference example was measured using the protective hot plate method (GHP method). The measurement device and measurement conditions were as follows. As a result, the thermal conductivity in the thickness direction of the gas absorber in the reference example was 0.051 W / m·K. Measurement device: NETZSCH GHP456s (main hot plate size 8 cm square) Sample size: 200 × 150 mm Measurement temperature: 20°C (heating plate 35°C, cooling plate 15°C) Measurement atmosphere: Nitrogen gas flow atmosphere Pressure: Atmospheric pressure

[0153] <Measurement of Porosity> The porosity of the reference gas absorber was measured using the Archimedes method. Specifically, first, the dry weight W of the reference gas absorber was measured. Ａｉｒ The following was measured. Next, the gas absorber used as a reference example was immersed in distilled water and then placed in a desiccator with a vacuum pump, and vacuum was applied for 45 minutes. The weight in water was measured. Ａｑ and water content weight W ａ＋ｗ The porosity (P) was measured. Then, the porosity was calculated based on the following formula (1). As a result, the porosity of the gas absorber in the reference example was 70%. P (%) = (W ａ＋ｗ -W Ａｉｒ ) / (W ａ＋ｗ -W Ａｑ ) × 100 ... (1)

[0154] <Introduction of Gas Absorbent> (Examples 1 to 12) Here, a gas absorbent was introduced to the gas absorbent precursors equipped with the heating elements according to Examples 1 to 12 prepared above. Specifically, first, the gas absorbent precursors were placed in a vacuum oven and vacuum-dried at 80°C for 3 hours. Next, a 30 wt% solution of polyethyleneimine (PEI) was prepared as the gas absorbent by dissolving PEI in ethanol. Then, the vacuum-dried gas absorbent precursors were impregnated into the PEI solution in the thickness direction of the precursor, and left to stand for 1 minute with the precursor completely submerged in the PEI solution. After that, the precursors were removed from the PEI solution, and the excess PEI solution adhering to the surface of the precursor was removed by placing the precursors perpendicular to the thickness direction. After that, the precursors were air-dried at room temperature overnight. After that, the precursors were placed in a vacuum oven and vacuum-dried at 80°C for 5 hours. After vacuum drying, each precursor was quickly wrapped in plastic wrap and allowed to cool at room temperature. This resulted in a gas absorber with a heating element, which comprises gas absorbent particles in which a gas absorbent is arranged within the pores of the carrier particles.

[0155] <Creation of Gas Absorption Units> (Examples 1 to 6) First, a frame measuring 300 mm in width, 400 mm in depth, and 300 mm in height was prepared. 150 gas absorbers with heating elements were stacked on the frame for each example. Next, one induction heater was placed at each end of the stacked gas absorbers in the arrangement direction as an induction heating device. This created the gas absorption units according to Examples 1 to 6.

[0156] (Examples 7 to 12) In Examples 7 to 12, an induction heater was used instead of an induction heating device. Other than this, the process was the same as in Examples 1 to 6. This resulted in the fabrication of the gas absorption units described in Examples 7 to 12.

[0157] <Evaluation of Gas Absorption Cycles> The gas absorption cycles of the gas absorption units prepared in Examples 1 to 12 above were evaluated using a gas evaluation device. The gas evaluation device consisted of a reactor, a gas supply line, a vacuum pump, and a low-concentration CO2 (detection range: 0 to 1000 ppm). ２ Concentration meter and high-concentration (detection range: 0-100%) CO2 ２It is equipped with a concentration meter, a wet gas meter, and vacuum valves. Vacuum valves are provided at the inlet and outlet sides of the reactor, respectively, as inlet vacuum valves and outlet vacuum valves. The gas supply line here uses air as the carrier gas and CO as the specific gas. ２ This is the line that supplies CO2 to the reactor and is located on the inlet side (upstream side) of the reactor. The vacuum pump is located on the outlet side (downstream side) of the reactor. Furthermore, a low-concentration CO2 supply line is located downstream of the vacuum pump. ２ Concentration meter and high-concentration CO2 ２ A concentration meter and a wet gas meter are provided. This allows for the supply of carrier gas into the reactor and the detection of CO2 gas flowing out of the reactor. ２ methyl and CO ２ It is possible to measure the cumulative flow rate.

[0158] The gas absorption units according to each example were placed inside the reactor so that the openings of the gas absorption units faced the inlet and outlet of the reactor (in other words, the direction in which the pair of openings of the gas absorption units were inserted coincided with the direction in which the inlet and outlet of the reactor were inserted).

[0159] First, by repeating the following steps (1) and (2), the CO in the gas is removed. ２ The CO2 was adsorbed onto the gas absorption unit inside the reactor. Then, in step (2) below, the CO2 gas that flowed out of the reactor was adsorbed onto the gas absorption unit inside the reactor. ２ When the concentration reaches 390 ppm, it is considered that the gas absorber has reached its saturation adsorption capacity, and CO ２ The adsorption process was completed. At this time, the total time spent performing the following steps (1) and (2) (including the time spent repeating them) was calculated as "CO ２ The adsorption time was defined as "adsorption time". Process (1): Open the inlet vacuum valve and close the outlet vacuum valve, and introduce air and CO from the gas supply line. ２ mixed gas (CO ２ Pour the solution (400 ppm concentration) into the reactor. Step (2): Close the inlet vacuum valve and open the outlet vacuum valve to completely discharge the gas from the reactor.

[0160] Next, the following steps (3) to (5) are performed, and the CO adsorbed onto the gas absorber is removed. ２CO was recovered. Then, when the vacuum gauge reading of the vacuum pump fell below 1 Pa, ２ Assuming that CO has been completely recovered from the gas absorber, ２ The recovery process was completed. At this time, the total time spent on the following steps (3) to (5) was calculated as "CO2". ２ The recovery time was defined as "CO2 recovery time". In Examples 7 to 12, in step (4) below, the gas absorber was heated to approximately 60°C using a hot plate instead of an IH heater. Step (3): Close the inlet vacuum valve, open the vacuum valve, and create a vacuum in the reactor. Step (4): Close the inlet vacuum valve, close the vacuum valve, power the IH heater, and raise the heating element to approximately 60°C. Step (5): Close the inlet vacuum valve, open the vacuum valve, and release CO2 from the reactor. ２ Collect them in the collection container.

[0161] For each example, the above CO ２ Adsorption time CO ２ The total recovery time was defined as "one cycle time (minutes)". In addition, CO was measured using a wet gas meter during the above steps (3) to (5). ２ The cumulative flow rate is "recovered CO2". ２ The amount was specified as "L". Furthermore, the CO in the recovery container ２ The average value of the concentration is "recovered CO2". ２ The concentration was expressed as "percentage (%)". The results are shown in Table 1.

[0162]

[0163] As shown in Table 1, in Examples 1 to 6 equipped with an induction heating device (IH heater), the cycle time was significantly reduced compared to Examples 7 to 12 equipped with a hot plate.

[0164] <Measurement of Pressure Loss> Here, the pressure loss was measured for the gas absorption units according to Examples 1 to 6. Specifically, air was flowed through the gas absorption units of Examples 1 to 6 at a flow velocity of 3 m / s from the inlet (one of the openings) of the gas absorption unit. The pressure on the inlet side and the pressure on the outlet side of the gas absorption unit were measured with a pressure gauge, and the pressure loss (Pa) was calculated. The results are shown in Table 2.

[0165]

[0166] As shown in Table 2, in Examples 3 to 6, where the gas absorber is equipped with protrusions, the pressure loss was smaller compared to Examples 1 and 2. This result is thought to be because turbulence was generated in the gas flow due to the protrusions when the gas flows into the gas absorber.

[0167] <Gas Separation and Recovery Apparatus> Hereinafter, a gas separation and recovery apparatus will be described as the second technology disclosed herein. Figure 13 is a schematic diagram showing the structure of the gas separation and recovery apparatus 100 according to this embodiment. Figure 14 is a schematic perspective view showing the structure near the gas absorption unit 120 according to this embodiment. Figure 15 is a schematic diagram showing the structure of the gas absorption unit 120 according to this embodiment. Figure 15 corresponds to the XV-XV view in Figure 14. Arrow G in Figures 13 and 14 ｍ G ｐ G ｒ G ｓ These indicate the flow directions of the mixed gas, treated gas, residual gas, and specific gas, respectively. The gas separation and recovery apparatus 100 disclosed herein will now be described.

[0168] The gas separation and recovery device 100 is a device that separates and recovers a specific gas (hereinafter referred to as "specific gas") (component) to be recovered from a mixed gas containing multiple types of gases.

[0169] In this specification, "mixed gas" refers to a gas containing at least two or more gaseous components, including a specified gas. Examples of mixed gases include air, exhaust gas, flue gas, biogas, gases generated during the cement manufacturing process, and gases generated during the iron and steel manufacturing process and / or the manufacturing process of steel products. The specified gases to be recovered may include, for example, various acidic gases, various basic gases, carbon monoxide, oxygen, nitrogen, hydrogen, etc.

[0170] Examples of acidic gases include carbon dioxide (CO2). ２ ), hydrogen sulfide (H ２ S), carbon disulfide (CS) ２ ), carbonyl sulfide (COS), mercaptan (R-SH, where "R" is an alkyl group having 1 to 20 carbon atoms), sulfur dioxide (SO２ Examples include the following. Examples of basic gases include monomethylamine, monoethylamine, dimethylamine, methylethylamine, diethylamine, and ammonia. The type of specific gas is not particularly limited as long as there is a gas absorbent for that gas.

[0171] The gas separation and recovery apparatus according to the technology disclosed herein can be suitably used, for example, as a direct air recovery (DAC) apparatus, a hydrogen recovery apparatus, a volatile organic compound (VOC) recovery apparatus, an incineration exhaust gas separation and recovery apparatus, an automobile exhaust gas separation and recovery apparatus, a wastewater oil recovery apparatus, a fluorine recovery apparatus, a boron recovery apparatus, an arsenic recovery apparatus, a selenium recovery apparatus, a phosphorus recovery apparatus, an organofluorine compound (PFAS) recovery apparatus, a colloid recovery apparatus, a metal recovery apparatus, an organometallic recovery apparatus, a metal ion recovery apparatus, a sludge recovery apparatus, a chemical activator recovery apparatus, a radioactive material recovery apparatus, and the like. In this embodiment, the gas separation and recovery apparatus 100 is a DAC apparatus that separates and recovers carbon dioxide from air.

[0172] As shown in Figure 13, the gas separation and recovery device 100 comprises a mixed gas supply unit 110, a gas absorption unit 120, a processed gas discharge unit 130, a residual gas discharge unit 140, and a specific gas recovery unit 150. The following describes the various components of the gas separation and recovery device 100.

[0173] The mixed gas supply unit 110 is for supplying a mixed gas into the gas absorption unit 120. For example, as shown in Figure 13, the mixed gas supply unit 110 may include a mixed gas supply source 111, a mixed gas supply pipe 112 having a space through which the mixed gas can flow, and a first valve 114.

[0174] The mixed gas supply source 111 is a source of supply (generation) of a mixed gas containing the specific gas to be recovered. The mixed gas supply source 111 is connected to the upstream end of the mixed gas supply pipe 112. The source of supply (generation) of the mixed gas supplied from the mixed gas supply source 111 is not particularly limited. For example, in this embodiment, it is configured so that air can be drawn in from the atmosphere as the mixed gas. Also, if the gas to be recovered is carbon dioxide, exhaust gas generated from factories, thermal power plants, automobiles, etc., can be supplied as the mixed gas. In this case, although not limited thereto, piping for directly introducing exhaust gas from the equipment that is the source of the exhaust gas may be connected to the mixed gas supply source 111.

[0175] The first valve 114 is a valve for opening and closing the mixed gas supply pipe 112. The first valve 114 is located on the mixed gas supply pipe 112. By opening and closing the first valve 114, the mixed gas is supplied into the gas absorption unit 120 via the mixed gas supply pipe 112 (arrow G in Figure 13). ｍ ). Preferably, the first valve 114, as well as the second valve 134, third valve 144, and fourth valve 154 described later, are all vacuum valves.

[0176] The gas absorption unit 120 is for separating and recovering a specific gas from the mixed gas supplied from the mixed gas supply unit 110. For example, as shown in Figure 15, the gas absorption unit 120 may include a container 122, a gas absorbent 123 (see Figure 17), a gas absorber 510, a heating element 540, and an induction heating device 550. The gas absorption unit 120 may also include a pressure gauge 124 and a thermometer 126 for monitoring the pressure and temperature inside the container 122. As shown in Figure 13, in this embodiment, the gas absorption unit 120 is connected to the pressure gauge 124 and the thermometer 126, respectively.

[0177] The container 122 here houses the gas absorber 510, the heating element 540, and the induction heating device 550. The container 122 is not particularly limited as long as it is configured so that carbon dioxide is not released into the atmosphere. The container 122 has pressure resistance to a maximum internal pressure (MPa) of typically about 0.3 MPa or less. The material of the container 122 is not particularly limited and may be stainless steel, for example.

[0178] The shape of the container 122 is not particularly limited and may be substantially cylindrical or polygonal columnar. As shown in Figure 14, the container 122 according to this embodiment is substantially rectangular parallelepiped and has side walls 122a to 122d, a bottom 122e, and a top 122f. Side walls 122a and 122b face each other in the left-right direction. Side walls 122c and 122d face each other in the front-rear direction. The bottom 122e and top 122f face each other in the up-down direction. An inlet 122g is formed in side wall 122a. The inlet 122g is connected to a mixed gas supply pipe 112, and a mixed gas is supplied from the inlet 122g via the mixed gas supply pipe 112. An outlet 122h is formed in side wall 122b. Outlet 122h is connected to discharge pipe 132, and the treated gas is discharged from outlet 122h through discharge pipe 132.

[0179] The gas absorbent 123 absorbs the specific gas to be recovered. In the gas absorption unit 120 according to this embodiment, the gas absorbent is supported by the gas absorber 510. The type of gas absorbent is not particularly limited and can be appropriately set according to the type of gas to be absorbed (specific gas). For example, if the specific gas is an acidic gas (e.g., CO ２ , H ２ As a gas absorbent, amine compounds (such as s) may be preferably used. Alternatively, if the specific gas is a basic gas, iron sulfate (FeSO4) may be used as a gas absorbent. ４ ), metaphosphate (HPO ３ ) can be used.

[0180] Amine compounds include, for example, at least one primary amino group (NH ２ －They are various compounds having ( ). The amine compound may contain a secondary amino group and / or a tertiary amino group in addition to the primary amino group. The amine compound may be solid or liquid at normal temperature. Among the amine compounds, there are those that become solid during gas adsorption (e.g., during CO ２ adsorption) and become liquid during gas desorption (during CO ２ desorption) (e.g., isophorodiamine, etc.). Such an amine compound may be used as the gas absorbent.

[0181] Examples of the amine compound include compounds having primary to tertiary amino groups such as amines, polyamines, aminoorganosilanes, etc. Examples of amines include monoethanolamine, diethanolamine, triethanolamine, isophorodiamine, etc. Examples of polyamines include polyethyleneimine, polypropyleneimine, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, etc. Examples of aminoorganosilanes include (3-aminopropyl)trimethoxysilane (APTS), N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, N-(2-aminoethyl)-3-amino-propyltriethoxysilane, N-(2-aminoethyl)-3-amino-propylmethyldimethoxysilane, 3-triethoxysilyl-N-(1,3-dimethyl-butylidene)propylamine, N-phenyl-3-aminopropyltrimethoxysilane, N-(n-butyl)-3-aminopropyltrimethoxysilane, etc. Also, as the amine compound, a compound in which a functional group is partially modified may be used. As the amine compound, one kind may be used alone, or two or more kinds may be mixed and used. Among them, it is preferable that the amine compound contains polyalkyleneimines such as polyethyleneimine and polypropyleneimine.

[0182] Furthermore, a particulate gas absorbent may be used as the gas absorbent 123. The type of particles used as the gas absorbent is not particularly limited and can be appropriately selected depending on the type of gas to be recovered. The particles used as the gas absorbent may be composed of, for example, an inorganic material or an organometallic frame (MOF: Metal Organic Frameworks). When such particles are composed of an inorganic material, examples of inorganic materials that can be used include zeolite, carbon, activated carbon, glass, clay minerals, diatomaceous earth, etc. The inorganic material may be any one of the above-mentioned inorganic materials alone, or it may be a combination of two or more types.

[0183] The shape of the gas absorber 510 can be any shape, such as a sheet, rectangular parallelepiped, cubic, prismatic, cylindrical, spherical, or pelletized, depending on the scale of the gas separation and recovery device 100 and the shape of the container 122. While not particularly limited, the gas absorber 510 is preferably a carrier sheet formed into a sheet shape, from the viewpoint of ensuring a suitable gas flow path and efficiently transferring heat from the heating element 540.

[0184] As shown in Figure 15, in this embodiment, a plurality of sheet-like gas absorbers 510 are stacked in a predetermined arrangement direction (Z direction in this embodiment) and housed in a container 122. The arrangement direction of the gas absorbers 510 is not particularly limited, but it is in the direction of gas flow (arrow G in Figure 15). ｍ and G ｒ It is preferable that the gas absorbers 510 are stacked in a direction substantially perpendicular to the inlet 122g. In other words, it is preferable that the stacked surface of the gas absorbers 510 faces the surface of the container 122 on which the inlet 122g is provided (in this case, the side wall 122a). This makes it possible to reduce pressure loss when the mixed gas flows in from the inlet 122g.

[0185] Furthermore, although not limited thereto, it is preferable that the gas absorbers 510 be stacked such that gaps are formed between them. As shown in Figure 15, in this embodiment, multiple gas absorbers 510 are stacked such that gaps are formed between them. This creates a space S between adjacent gas absorbers 510. This space S serves as a gas flow path when gas is introduced into the gas absorption unit 120 (container 122). However, it is not limited thereto, and the multiple gas absorbers 510 may be stacked so that they are in contact with each other.

[0186] In this embodiment, the multiple gas absorbers 510 are held by being sandwiched between side walls 122c and 122d. The method of holding the gas absorbers 510 is not limited to the above embodiment; for example, the multiple gas absorbers 510 may be fixed with an adhesive. As the adhesive, for example, aqueous adhesives, urea resin adhesives, melamine resin adhesives, phenol resin adhesives, resorcinol resin adhesives, aqueous polymer-isocyanate adhesives, vinyl acetate resin adhesives, emulsion adhesives, solvent adhesives, chloroprene rubber adhesives, chemical reaction adhesives, epoxy resin adhesives, urethane resin adhesives, modified silicone adhesives, hot melt adhesives, etc. can be used.

[0187] Here, the gas absorber 510 related to the gas separation and recovery apparatus 100 of this embodiment will be described. However, this embodiment is merely an example and is not intended to limit the technology of this disclosure. Figure 16 is a schematic plan view showing the structure of the gas absorber 510 according to this embodiment. Figure 17 is a schematic enlarged plan view showing the structure of the gas absorber 510 according to this embodiment. Figure 18 is a schematic front view showing the gas absorber 510 according to this embodiment. In Figures 16 to 18, the heating element 540 is shown by a dashed line. For convenience of explanation, the convex portion 520p is omitted from the illustration in Figure 17. In Figures 16 and 18, the carrier particles 530 are omitted from the illustration.

[0188] As shown in Figures 16 to 18, in this embodiment, the gas absorber 510 comprises a resin matrix 520 and carrier particles 530. The presence of the resin matrix 520 and carrier particles 530 in the gas absorber 510 can be confirmed, for example, by observing the surface or cross-section of the gas absorber 510 with a scanning electron microscope (SEM).

[0189] The resin matrix 520 supports the gas absorbent 123 and may function as a framework in the gas absorber 510. The resin matrix 520 contains a resin and may be composed of crystalline particles of the resin bonded together. While not particularly limited, the resin components contained in the resin matrix 520 include acrylic resins, cellulose resins, and resins classified as super engineering plastics. The resin matrix 520 may contain one of the above-mentioned resins alone, or it may contain two or more in combination.

[0190] Acrylic resins include, for example, polymers containing alkyl (meth)acrylate as a constituent monomer component and derivatives thereof. In this specification, "(meth)acrylate" is used as a term that comprehensively means acrylate and / or methacrylate. Examples of acrylic resins include polymers containing alkyl (meth)acrylate as a main monomer (a component accounting for 50% or more by mass of the total monomer) and copolymers containing this main monomer and a secondary monomer copolymerizable with the main monomer. Examples of acrylic resins include poly(meth)acrylic acid, poly(meth)acrylamide, and polymethyl methacrylate (PMMA). Among these, the acrylic resin used in the resin matrix 520 preferably contains methacrylic acid and / or PMMA.

[0191] Cellulose resins include, for example, all compounds derived from cellulose (cellulose derivatives). Examples of cellulose resins include ethylcellulose (EC), hydroxyethylcellulose (HEC), ethylmethylcellulose (EMC), hydroxyethylmethylcellulose (HEMC), nitrocellulose, and diacetylcellulose. Among these, the cellulose resin used in the resin matrix 520 preferably contains ethylcellulose.

[0192] Super engineering plastics are resins characterized by, for example, excellent heat resistance and excellent mechanical strength. Examples of super engineering plastics include fluorine-based resins such as polytetrafluoroethylene (PTFE), tetrafluoroethylene perfluorovinyl ether copolymer (PFA), tetrafluoroethylene hexafluoropropylene copolymer (FEP), chlorotrifluoroethylene homopolymer (PCTFE), ethylene tetrafluoroethylene copolymer (ETFE), ethylene chlorotrifluoroethylene copolymer (ECTFE), and vinylidene fluoride homopolymer (PVDF); thermoplastic polyimides such as polybenzimidazole (PBI), polyimide (PI), polyetherimide (PEI), and polyamideimide (PAI); and polyethersulfone (PES), polyetheretherketone (PEEK), polyphenylene sulfide (PPS), PSU (polysulfone), and polyphenylsulfone (PPSU). The super engineering plastic used in the resin matrix 520 preferably contains PEI, PES, PVDF, PSU, PPSU, etc.

[0193] Although not limited thereto, as shown in FIG. 17, the resin matrix 520 preferably has a three-dimensional network structure including pores 522. Thereby, the gas absorbent can be supported not only on the surface of the resin matrix 520 but also in the pores 522. Further, when the gas absorber 510 includes the carrier particles 530, the carrier particles can be supported in the pores 522. Therefore, the amount of the gas absorbent supported per unit volume increases, and the recovery and separation performance of a specific gas can be improved. Further, since the gas absorber 510 has a three-dimensional network structure, it has excellent gas diffusibility. Thereby, the flow of the mixed gas can be facilitated. Further, although details will be described later, the gas separation and recovery apparatus 100 of the present embodiment supplies the mixed gas and separates the specific gas using the vacuum pump 136. Therefore, the mixed gas can reach preferably up to the gas absorbent 123 supported inside the gas absorber 510. Thereby, the separation and recovery efficiency of the specific gas can be improved. The pores 522 may be communicating pores that communicate with each other. As an example, the porosity of the gas absorber 510 based on the Archimedes' method may be, for example, 70% or more and 90% or less. Note that the "porosity of the gas absorber" can be calculated based on the Archimedes' method. More specifically, the dry weight W Ａｉｒ of the gas absorber, the weight W Ａｑ in water, and the water-containing weight W ａ＋ｗ are measured, and the porosity (P) can be calculated based on the following formula (1). P (%) = (W ａ＋ｗ −W Ａｉｒ ) / (W ａ＋ｗ −W Ａｑ ) × 100... (1)

[0194] As shown in Figure 16 or Figure 18, the resin matrix 520 may comprise a base portion 520b and a plurality of protrusions 520p. The base portion 520b is a flat plate-shaped portion. The protrusions 520p here extend upward from the surface of the base portion 520b. With this configuration, when housed in the gas absorption unit 120, the protrusions 520p can suitably form a space S between adjacent gas absorbers 510. Furthermore, with this configuration, turbulence is generated in the gas flow by the protrusions 520p when the mixed gas is supplied. This reduces pressure loss when the mixed gas is supplied, while allowing the mixed gas and the gas absorbent to come into contact more efficiently. However, the resin matrix 520 is not limited to this, and may be a flat plate-shaped portion without protrusions.

[0195] The shape of the protrusions 520p is not particularly limited. The shape of the protrusions 520p may be, for example, stripe-shaped, dot-shaped, island-shaped, dashed-line-shaped, etc. As shown in Figures 16 and 18, the multiple protrusions 520p are spaced apart from each other and extend along a direction perpendicular to the thickness direction of the gas absorber 510 (here, the X direction) (in other words, in a stripe-like pattern). The spacing between the multiple protrusions 520p may be equal or unequal. In some embodiments, multiple dot-shaped protrusions 520p may be arranged in a staggered pattern. Note that "multiple protrusions arranged in a staggered pattern" means that adjacent protrusions 520p in the first direction (e.g., the X direction) are offset from each other in the second direction (e.g., the Y direction), but adjacent protrusions 520p that are spaced apart in the first direction are arranged to be at the same position in the second direction.

[0196] The height of the protrusion 520p can be adjusted as appropriate according to the size of the container 122, the number of gas absorbers 510 housed in the container 122, etc., and is not particularly limited. From the viewpoint of securing space S, the height H of the protrusion 520p ｐ For example, it may be 0.5 mm or more, and preferably 1 mm or more. On the other hand, from the viewpoint of the absorption amount of a specific gas, the height H of the protrusion 520p ｐ For example, it may be 50 mm or less, and preferably 10 mm or less. In this specification, "the height H of the protrusion 520pｐ " refers to the length of the perpendicular line drawn from the apex of the protrusion 520p to the point on the base portion 520b closest to the protrusion 520p, when viewed in the thickness direction of the gas absorber 510.

[0197] The gas absorber 510 may also include carrier particles 530. The carrier particles 530 are particles that support the gas absorbent 123. Here, the gas absorbent 123 is arranged on the surface of the carrier particles 530. This makes it possible to increase the amount of gas absorbent supported per gas absorber 510.

[0198] In this case, the carrier particles 530 are arranged within the pores 522 of the resin matrix 520. Preferably, the carrier particles 530 are present in the pores 522 while being mostly separated from the resin matrix 520.

[0199] The shape of the carrier particles 530 is not particularly limited and may be spherical or non-spherical. Examples of non-spherical carrier particles 530 include plate-shaped, flaky, flake-shaped, or irregularly shaped particles. When spherical carrier particles 530 are used, the aspect ratio of the carrier particles 530 may be, for example, 1.2 or more and 2 or less. On the other hand, from the viewpoint of absorption stability of the specific gas to be absorbed, the upper limit of the aspect ratio of non-spherical carrier particles 530 may be, for example, 5 or less. Furthermore, the carrier particles 530 may be in the form of a so-called mixed powder, which is a mixture of spherical particles and non-spherical particles.

[0200] The carrier particles 530 may be an inorganic porous material capable of supporting the gas absorbent 123. For example, the carrier particles 530 are preferably porous materials with a relatively large specific surface area. The carrier particles 530 may be composed of, for example, an inorganic material or an organometallic frame (MOF). When the carrier particles 530 are composed of an inorganic material, preferably used inorganic materials include activated carbon, oxides of metalloid elements, oxides of metal elements, and their solid solutions. Examples of inorganic materials include activated carbon, silica, alumina, ceria, zirconia, titania, zeolite, etc. The inorganic material may be any one of the above-mentioned inorganic materials alone, or a combination of two or more. In particular, the carrier particles 530 preferably contain silica particles.

[0201] The average particle size of the carrier particles 530 is not particularly limited, but may be, for example, about 0.1 μm to 20 μm. In this specification, "average particle size of carrier particles" refers to the arithmetic mean of the equivalent circle diameter measured based on optical microscope observation. Here, the equivalent circle diameter refers to the diameter of a circle having the same area as the area of ​​an ellipse formed by the longest diameter of the carrier particle observed in the microscope image (the major axis) and the longest diameter of the line intersecting the major axis at a right angle (the minor axis). In this specification, the average particle size of porous particles refers to the arithmetic mean of the equivalent circle diameters of 200 randomly selected carrier particles.

[0202] As shown in Figure 17, the carrier particles 530 may have a plurality of pores 532. Although not limited to this, the carrier particles 530 are preferably porous particles having a plurality of mesopores. In other words, the carrier particles 530 can be, for example, a mesoporous material having mesopores. With this configuration, the gas absorbent can be supported in the pores of the carrier particles 530, so that the amount of gas absorbent 123 supported per gas absorber 510 can be increased. This makes it possible to suitably improve the recovery efficiency of a specific gas. In addition, the carrier particles 530 in this embodiment are arranged in the pores 522 of the resin matrix 520. This allows the carrier particles 530 to exist in a state where the pores 532 of the carrier particles 530 are not crushed or filled with resin.

[0203] "Mesopore" refers to a pore with a diameter in the range of 2 nm to less than 50 nm, based on the IUPAC classification. Pore 532 is an example of a "mesopore." The presence of pore 532 in the carrier particle 530 can be confirmed, for example, by observing the surface or cross-section of the carrier particle 530 with a scanning electron microscope (SEM).

[0204] In some embodiments, a particulate gas absorbent may be supported instead of the carrier particles 530. When a particulate gas absorbent is used, its configuration (aspect ratio, average particle size, specific surface area, average pore diameter, etc.) is equivalent to that of the carrier particles 530 described above, except for the points mentioned above. Therefore, a detailed explanation of these overlapping elements will be omitted.

[0205] <Heating Element> The heating element 540 is a component that generates heat by the induction heating device 550, which will be described later. The heating element 540 is not particularly limited as long as it generates heat by the induction heating device 550, but from the viewpoint of dielectric heating efficiency, it is preferable that it comprises at least one of metal or carbon. Examples of the above metals include SUS, iron-chromium-aluminum alloy (kanthal wire), alloy mainly composed of nickel and chromium (nichrome wire), molybdenum, tungsten, platinum, tantalum, tungsten, silicon carbide, molybdenum silicide, lanthanum chromite, carbon, molybdenum disilicide, etc.

[0206] The shape of the heating element 540 is not particularly limited as long as it can conduct heat through the gas absorption unit 120. The heating element 540 can be, for example, a sheet-like member, a mesh-like member, or a member with multiple through holes (for example, perforated metal). However, the shape of the heating element 540 is not limited to this, and it may also be a plate-like member. From the viewpoint of reducing pressure loss, it is preferable to use a mesh-like member or a member with multiple through holes as the heating element 540. When using a mesh-like material as the heating element 540, the weaving method is not particularly limited, and for example, a material composed of known weaving methods such as plain weave, twill weave, tatami weave, or twill tatami weave can be used.

[0207] The number of heating elements 540 in the gas absorption unit 120 is not particularly limited as long as it can raise the temperature of the gas absorption unit 120, and may be one or more (two or more). If the gas absorption unit 120 is equipped with sheet-shaped gas absorbers 510, it is preferable that the number of heating elements 540 is the same as or greater than the number of gas absorbers 510 housed in the container 122.

[0208] The placement of the heating elements 540 is not particularly limited as long as it can raise the temperature of the gas absorption unit 120. For example, from the viewpoint of uniformly raising the temperature of the gas absorption unit 120, it is preferable that multiple heating elements 540 are arranged at equal intervals while being spaced apart from each other. Also, when using a sheet-shaped gas absorber 510, it is preferable that the heating elements 540 are arranged (stacked) in a direction that coincides with the stacking direction of the gas absorber 510. This allows the temperature of the gas absorption unit 120 to be raised more quickly.

[0209] The thickness of the heating element 540 is not particularly limited, but is preferably, for example, 0.02 mm or more and 15 mm or less. Also, although not limited thereto, when a mesh structure is used as the heating element 540, the wire diameter of the heating element 540 is preferably, for example, 0.016 mm or more and 2 mm or less. With this configuration, the temperature inside the gas absorption unit 120 can be suitably raised, while the gas absorbent and the supplied mixed gas can be brought into contact more efficiently. The "wire diameter of the heating element" can be measured using a caliper or the like.

[0210] While not limited to this, when a mesh structure is used as the heating element 540, the mesh opening of the heating element 540 is preferably 0.01 mm or more, and more preferably 0.015 mm or more. With this configuration, the mixed gas and the gas absorbent can be brought into contact more efficiently while suppressing obstruction of the flow path of the mixed gas. On the other hand, from the viewpoint of suitably raising the temperature of the gas absorption unit, the mesh opening of the heating element 540 is preferably 20 mm or less, and more preferably 15 mm or less. The "mesh opening of the heating element" can be determined by first counting the number of holes in one side of the heating element over 1 inch (25.4 mm). Then, based on the obtained mesh number and wire diameter (mm), the "mesh opening of the heating element (mm) = (25.4 / mesh number) - wire diameter (mm)".

[0211] The void ratio of the heating element 540 is preferably 30% or more, more preferably 40% or more, and even more preferably 50% or more. This suppresses obstruction of the gas (air) flow path through the gas absorber 510, and allows for more efficient contact between the gas-absorbing particles 26 arranged inside the gas absorber 510 and the gas to be recovered. On the other hand, from the viewpoint of suitably raising the temperature of the gas absorber 510, the void ratio of the heating element 540 is preferably 90% or less, and more preferably 85% or less. Note that when a mesh structure is used as the heating element, the "void ratio of the heating element (%) = (mesh opening (mm))" ２ (Mesh opening (mm) + wire diameter (mm)) ２ It can be calculated by multiplying by 100. Furthermore, when perforated metal is used as the heating element, the porosity (%) can be calculated using a formula corresponding to the shape, diameter, pitch, and arrangement of the holes, and the resulting porosity (%) can be adopted as the "void ratio of the heating element." Since such formulas are well known to those skilled in the art, they are omitted here.

[0212] As shown in Figure 18, the heating element 540 may be supported on the resin matrix 520. In this embodiment, the heating element 540 is positioned approximately in the center when viewed in the thickness direction of the gas absorber 510. However, it is not limited to this, and the heating element 540 may be positioned off-center to the upper or lower side when viewed in the thickness direction of the gas absorber 510. Furthermore, a portion of the heating element 540 may be exposed from the surface of the resin matrix 520 (upper or lower side when viewed in the thickness direction). Also, the heating element 540 may be positioned separately from the resin matrix 520.

[0213] While not limited to this, the heating element 540 is preferably positioned so as to be in contact with at least a portion of the gas absorber 510 (more specifically, the resin matrix 520), and preferably so as to be embedded in the gas absorber 510. This ensures more reliable contact between the heating element 540 and the gas absorber 510, allowing the heating element 540 to rapidly heat the gas absorption unit 120.

[0214] As shown in Figure 16, in this embodiment, the heating element 540 is arranged over the entire area of ​​the resin matrix 520 in a plan view. However, it is not limited to this, and the heating element 540 may be arranged in a part of the area of ​​the resin matrix 520 in a plan view. In other words, the heating element 540 may be arranged so as to be in contact with at least a part of the gas absorber 510 (resin matrix 520). Also, the heating element 540 may be arranged so as to protrude (be exposed) from the edges of the resin matrix 520 in the width direction and / or longitudinal direction. Although not limited to this, from the viewpoint of suitably raising the temperature of the gas absorption unit 120, it is preferable to arrange the heating element 540 in an area of ​​20% or more, and more preferably in an area of ​​30% or more, when the area of ​​the resin matrix 520 in a plan view is taken as 100%.

[0215] <Induction Heating Device> The induction heating device 550 is a device that promotes heating of the heating element 540. As shown in Figure 15, the induction heating device 550 is connected to the power supply 128. When current flows through the induction heating device 550 by the power supply 128, the heating element 540 generates heat. This allows the gas absorption unit 120 (gas absorber 510) to be heated up quickly. Conventional known devices can be used without limitation as the induction heating device 550.

[0216] The number of induction heating devices 550 housed in the gas absorption unit 120 (container 122) is not particularly limited; there may be one or more (two or more). The location of the induction heating devices 550 is not particularly limited as long as they can heat the heating element 540. As shown in Figure 15, in this embodiment, a total of two induction heating devices 550 are arranged, one at each end in the arrangement direction of the gas absorber 510 and the heating element 540. Although not limited to this, it is preferable that the induction heating devices 550 be arranged at one end in the arrangement direction of the gas absorber 510 and the heating element 540. Furthermore, it is preferable that the induction heating devices 550 be arranged at at least one end in a direction perpendicular to the arrangement direction of the heating element 540, and on a surface of the container 122 where the inlet 122g and outlet 122h are not provided, and it is more preferable that the induction heating devices 550 be arranged at both ends. With this configuration, the gas absorption unit 120 can be heated up more quickly.

[0217] The area in which the induction heating device 550 is placed is not particularly limited. As shown in Figure 15, in this embodiment, the induction heating device 550 is placed so as to cover the entire area of ​​the gas absorber 510 in a plan view. However, it is not limited to this, and the induction heating device 550 may be placed in a part of the area of ​​the gas absorber 510 in a plan view. Also, the induction heating device 550 may be placed so as to protrude (be exposed) from the ends of the gas absorber 510 in the width direction and / or the longitudinal direction.

[0218] When separating and recovering a specific gas using a gas separation and recovery device, for example, a mixed gas is supplied into a gas absorption unit. This allows the gas absorption unit to absorb the specific gas contained in the mixed gas, thereby separating the specific gas from the mixed gas. Subsequently, the gas absorption unit is heated to a predetermined temperature. This causes the specific gas to desorb from the gas absorption unit, and the specific gas is recovered. Therefore, in order to efficiently separate and recover the specific gas, it is necessary to heat the gas absorption unit to a predetermined temperature as quickly as possible.

[0219] As described above, the gas separation and recovery apparatus 100 disclosed herein is characterized in that the gas absorption unit 120 comprises a heating element 540 and an induction heating device 550. With this configuration, the heating element 540 generates heat due to the induction heating device 550, which allows the gas absorption unit 120 to be quickly heated to a predetermined temperature. Therefore, specific gases can be recovered efficiently. Furthermore, in the gas separation and recovery apparatus 100 disclosed herein, the heating is performed by the heating element 540 and the induction heating device 550. Therefore, the gas separation and recovery apparatus 100 disclosed herein does not require a steam generator such as a boiler or equipment for condensing or drying steam after the recovery of specific gases. Therefore, according to this embodiment, the gas separation and recovery apparatus 100 can be miniaturized.

[0220] The post-treatment gas discharge section 130 discharges the gas after it has been treated by the gas absorption unit 120 (hereinafter referred to as "post-treatment gas"). For example, as shown in Figure 13, the post-treatment gas discharge section 130 may include a discharge pipe 132 having a space through which the post-treatment gas can flow, a second valve 134, and a vacuum pump 136. In this specification, "post-treatment gas" refers to the gas after it has been treated by the gas absorption unit 120 from the mixed gas, and typically refers to the specific gas and residual gas.

[0221] As shown in Figure 13, the discharge pipe 132 is the main pipe for discharging the treated gas, and is connected downstream to the branch pipes, the residual gas discharge pipe 142 and the specific gas discharge pipe 152, respectively. By opening and closing the third valve 144 and the fourth valve 154, the treated gas can be circulated through the discharge pipe 132 to the residual gas discharge pipe 142 and the specific gas discharge pipe 152 (arrow G in Figure 13). ｒ G ｓ ).

[0222] The second valve 134 is a valve for opening and closing the discharge pipe 132. The second valve 134 is located on the discharge pipe 132. By opening the second valve 134, the treated gas from the gas absorption unit 120 can be circulated through the discharge pipe 132.

[0223] The vacuum pump 136 is connected to the discharge pipe 132 downstream of the second valve 134 (right side in Figure 13). By operating the vacuum pump 136, a mixed gas can be supplied into the gas absorption unit 120. Also, by operating the vacuum pump 136, residual gas in the gas absorption unit 120 can be discharged to the residual gas discharge section 140. Furthermore, by operating the vacuum pump 136, the gas absorption unit 120 can be heated under reduced pressure inside the gas absorption unit 120, thereby separating specific gases and recovering them from the gas absorption unit 120. This allows for the efficient recovery of high-concentration specific gases. For this reason, the gas separation and recovery device 100 disclosed herein does not require a carrier gas supply line for the cleaning process. In addition, when recovering specific gases by operating the vacuum pump 136, the gas absorption unit 120 can be rapidly cooled. For this reason, the gas separation and recovery device 100 disclosed herein does not require a cooling function such as a fan to cool the inside of the gas absorption unit 120. Therefore, with this configuration, the gas separation and recovery device 100 can be miniaturized. However, the gas separation and recovery device 100 may also be equipped with a cooling device (for example, a chiller) for cooling the gas absorption unit 120.

[0224] The residual gas discharge section 140 is for discharging residual gas from the gas absorption unit 120 via the processed gas discharge section 130. The residual gas discharge section 140 may include a residual gas discharge pipe 142 having a space through which residual gas can flow, and a third valve 144. The residual gas discharge section 140 may also include an exhaust pipe 146 and a first specific gas concentration meter 148. In this specification, "residual gas" refers to the gas after the specific gas has been adsorbed from the mixed gas by the gas absorption unit 120. That is, the "residual gas" includes not only gas that substantially does not contain the specific gas, but also gas that contains components of the specific gas. Typically, the concentration of the specific gas in the residual gas is lower than the concentration of the specific gas in the mixed gas. Furthermore, "substantially free of the specific gas" refers to gas in which the concentration of the specific gas contained in the residual gas is 100 ppm or less (preferably 50 ppm or less).

[0225] The third valve 144 is a valve for opening and closing the residual gas discharge pipe 142. The third valve 144 is located on the residual gas discharge pipe 142. Here, with the second valve 134 open, by opening and closing the third valve 144, residual gas is discharged into the atmosphere from the exhaust stack 146 via the residual gas discharge pipe 142 (arrow G in Figure 13). ｒ ).

[0226] The first specific gas concentration meter 148 measures the concentration of specific gases contained in the residual gas flowing through the residual gas discharge pipe 142. In this embodiment, a carbon dioxide concentration meter is provided as the first specific gas concentration meter 148.

[0227] The specific gas recovery unit 150 is for recovering the specific gas separated from the gas absorption unit 120. The specific gas recovery unit 150 may include a specific gas discharge pipe 152 having a space through which the specific gas can flow, and a fourth valve 154. The specific gas recovery unit 150 may also include a gas tank 156, a second specific gas concentration meter 158, and a specific gas cumulative flow meter 157.

[0228] The fourth valve 154 is a valve for opening and closing the specific gas discharge pipe 152. The fourth valve 154 is located on the specific gas discharge pipe 152. Here, with the second valve 134 open, by opening and closing the fourth valve 154, the specific gas separated from the gas absorption unit 120 passes through the post-treatment gas discharge section 130, through the specific gas discharge pipe 152, and is recovered into the gas tank 156.

[0229] The gas tank 156 is a tank for temporarily storing a specific gas. The configuration of the gas tank 156 is not particularly limited, as it can be changed depending on the type of specific gas and the scale of the equipment. However, the gas tank 156 may be connected to equipment that uses the specific gas.

[0230] The second specific gas concentration meter 158 measures the concentration of the specific gas flowing through the specific gas discharge pipe 152. In this embodiment, a carbon dioxide concentration meter is provided as the second specific gas concentration meter 158.

[0231] The specific gas flow meter 157 is placed on the specific gas discharge pipe 152. This allows for the measurement of the flow rate of the specific gas circulating within the specific gas discharge pipe 152.

[0232] The gas separation and recovery apparatus 100 according to this embodiment has been described above. With this apparatus, a specific gas can be efficiently separated and recovered from a mixed gas in a short time. Furthermore, this configuration enables a miniaturized gas separation and recovery apparatus. In addition, because it is smaller than conventional separation and recovery apparatuses, the capacity of the gas absorption unit 120 of the gas separation and recovery apparatus 100 can be increased. This makes it possible to separate and recover a specific gas from a mixed gas even more efficiently.

[0233] The gas separation and recovery device 100 may be operated manually or automatically. For example, the first valve 114, second valve 134, third valve 144, fourth valve 154, pressure gauge 124, thermometer 126, vacuum pump 136, power supply 128, first specific gas concentration meter 148, second specific gas concentration meter 158, and specific gas integrated flow meter 157 may be electrically connected to a control unit (not shown). Based on input data from the pressure gauge 124, thermometer 126, first specific gas concentration meter 148, second specific gas concentration meter 158, and specific gas integrated flow meter 157, the first valve 114, second valve 134, third valve 144, fourth valve 154, vacuum pump 136, and power supply 128 may be controlled automatically. The series of operations of the gas separation and recovery device 100 by the control unit may be controlled, for example, by a computer driven according to a predetermined program. Each function of the control unit can be processed, for example, through the cooperation of hardware such as the arithmetic unit (processor, CPU (Central Processing Unit), MPU (Micro-processing unit)), storage unit (memory, hard disk, etc.) of each computer constituting the control unit, and software. The configuration of the control unit is not characteristic of the technology disclosed herein, and therefore will not be described here.

[0234] In some embodiments, the gas absorption units 1,200, and 300 according to the first technology described above can be used as the gas absorption unit 120 of the gas separation and recovery device 100. The frame 10 of the gas absorption units 1,200, and 300 is an example of the container 122 related to the gas separation and recovery device 100.

[0235] <Gas Recovery Method> A method for recovering a specific gas using the gas separation and recovery apparatus 100 (hereinafter also referred to as the "gas recovery method") will be described below. Figure 19 is a flowchart illustrating the gas recovery method according to the first embodiment. The gas recovery method disclosed herein includes a mixed gas supply step S10, a specific gas adsorption step S20, a residual gas discharge step S30, a gas absorption unit depressurization step S40, a gas absorption unit heating step S50, a specific gas separation step S60, and a specific gas recovery step S70. Further steps may be included at any stage.

[0236] (Mixed gas supply process S10) In the mixed gas supply process S10, the mixed gas is supplied into the gas absorption unit 120. Here, with the second valve 134 closed, the first valve 114 is opened, and the mixed gas is supplied from the mixed gas supply source 111 to the gas absorption unit 120 via the mixed gas supply pipe 112 (arrow G in Figure 13). ｍ ).

[0237] In this embodiment, first, the vacuum pump 136 is operated with the first valve 114 and the fourth valve 154 closed and the second valve 134 and the third valve 144 open. This causes the gas (typically air, etc.) inside the gas absorption unit 120 to be discharged from the exhaust pipe 146, and the inside of the gas absorption unit 120 becomes a reduced-pressure state. At this time, it is preferable to continue this operation until the pressure inside the gas absorption unit 120 becomes 1000 Pa or less. In this specification, "reduced-pressure state" refers to a state in which the inside of the gas absorption unit (inside the container) is reduced to below atmospheric pressure by the vacuum pump.

[0238] Next, with the second valve 134 closed, the first valve 114 is opened. This creates negative pressure inside the gas absorption unit 120, and the mixed gas is supplied from the mixed gas supply source 111 to the gas absorption unit 120 via the mixed gas supply pipe 112. This configuration allows the mixed gas to quickly spread throughout the gas absorption unit 120. Furthermore, by spreading the mixed gas throughout the gas absorption unit 120, the amount of specific gas absorbed can be increased. Therefore, the specific gas adsorption process S20, described later, can be performed more efficiently. However, the means for the mixed gas supply process S10 are not limited to this; for example, a mixed gas supply source 111 equipped with a pressure regulator may be provided, and the mixed gas may be supplied by adjusting the supply pressure of the mixed gas.

[0239] The temperature of the gas absorption unit 120 when performing the mixed gas supply process S10 is not particularly limited, as the optimal temperature for the gas absorption unit 120 to absorb the specific gas varies depending on the type of specific gas and the configuration of the gas absorption unit 120. However, the temperature of the gas absorption unit 120 when performing the mixed gas supply process S10 is preferably 30°C or more lower than the heating temperature in the gas absorption unit heating process S50, and more preferably 40°C or more lower. On the other hand, although not limited thereto, the lower limit of the temperature of the gas absorption unit 120 when performing the mixed gas supply process S10 may be, for example, 0°C or higher.

[0240] (Specific Gas Adsorption Step S20) In the specific gas adsorption step S20, the specific gas is adsorbed from the mixed gas onto the gas absorption unit 120. In this embodiment, the mixed gas supplied in the mixed gas supply step S10 comes into contact with the gas absorbent 123 supported on the gas absorber 510 within the gas absorption unit 120. As a result, the specific gas is selectively absorbed from the mixed gas by the gas absorbent 123.

[0241] The temperature at which the specific gas adsorption step S20 is performed is not particularly limited, as the optimal temperature for adsorbing the specific gas from the gas absorption unit 120 varies depending on the specific gas to be recovered and the configuration of the gas absorption unit 120. For example, if the specific gas to be recovered is carbon dioxide, the temperature at which the specific gas adsorption step S20 is performed is, for example, 40°C or lower, preferably 30°C or lower, and more preferably 20°C or lower, from the viewpoint of suitably adsorbing the specific gas onto the gas absorption unit 120. On the other hand, the lower limit of the temperature at which the specific gas adsorption step S20 is performed may be, for example, 0°C or higher.

[0242] As described above, the mixed gas supplied in the mixed gas supply step S10 comes into contact with the gas absorbent 123 in the gas absorption unit 120, causing the specific gas to be adsorbed by the gas absorbent 123. That is, typically, the mixed gas supply step S10 and the specific gas adsorption step S20 can be carried out in parallel. However, it is not limited to this, and in some embodiments, the supply of the mixed gas may be stopped to allow time for the specific gas to be adsorbed.

[0243] (Residual gas discharge process S30) In the residual gas discharge process S30, residual gas remaining after the specific gas adsorption process S20 is discharged from the gas absorption unit 120. In this embodiment, with the vacuum pump 136 in operation, the first valve 114 is closed and the second valve 134 and the third valve 144 are opened. As a result, residual gas inside the gas absorption unit 120 is released into the atmosphere from the exhaust pipe 146 via the discharge pipe 132 and the residual gas discharge pipe 142.

[0244] (Gas Absorption Unit Depressurization Process S40) In the gas absorption unit depressurization process S40, the gas absorption unit 120 is maintained under depressurization conditions of at least 1000 Pa or less. In this embodiment, the operation of the vacuum pump 136 is maintained with the first valve 114 and the fourth valve 154 closed and the second valve 134 and the third valve 144 open. This depressurizes the gas absorption unit 120 (inside the container 122). Then, when the pressure becomes at least 1000 Pa or less, the first valve 114 and the second valve 134 are closed, thereby maintaining the gas absorption unit 120 under predetermined depressurization conditions. Here, the third valve 144 is further closed.

[0245] In the gas absorption unit depressurization step S40, it is preferable, and more preferable, to maintain the gas absorption unit 120 (inside the container 122) under a depressurization condition of at least 1000 Pa or less. This makes it possible to remove gases other than the specified gas remaining inside the gas absorption unit 120, and to recover a higher concentration of the specified gas in the subsequent specified gas recovery step S70.

[0246] (Gas Absorption Unit Heating Process S50) Next, in the gas absorption unit heating process S50, the gas absorption unit is heated by induction heating under the reduced pressure conditions described above. In this embodiment, following the gas absorption unit depressurization process S40, the operation of the vacuum pump 136 is maintained, and the first valve 114, second valve 134, third valve 144, and fourth valve 154 are kept closed. In this state, the power supply 128 supplies current to the induction heating device 550. As a result, the heating element 540 is heated by the induction heating device 550, and the heat generated is transferred to the gas absorber 510, causing the temperature of the gas absorber 510 to rise. However, the operation of the vacuum pump 136 is not essential in the gas absorption unit heating process S50. Although not limited to this, the gas absorption unit heating process S50 may be performed even when the vacuum pump 136 is not operating.

[0247] To efficiently recover a specific gas, it is necessary to rapidly raise the temperature of the gas absorption unit 120 to the gas separation temperature. In this embodiment, the gas absorption unit 120 is heated by promoting the heat generation of the heating element 540 using an induction heating device 550. This allows the gas absorption unit 120 (gas absorber 510) to be quickly heated to a predetermined temperature. Furthermore, in this embodiment, the gas absorption unit heating step S50 is performed under predetermined reduced pressure conditions. This allows the specific gas to be desorbed from the gas absorption unit 120 more quickly.

[0248] The heating temperature in the gas absorption unit heating step S50 can be set to a temperature at or above the temperature at which the specific gas can be desorbed from the gas absorption unit 120. This heating temperature is not particularly limited, as the temperature at which the specific gas can be separated from the gas absorption unit 120 varies depending on the specific gas to be recovered and the configuration of the gas absorption unit 120. For example, if the specific gas to be recovered is carbon dioxide, the heating temperature may be between 40°C and 120°C.

[0249] (Specific Gas Separation Step S60) In the specific gas separation step S60, the specific gas is separated from the gas absorption unit 120. In this embodiment, the inside of the gas absorption unit 120 is maintained under temperature conditions that separate the specific gas. This makes it possible to separate the specific gas from the gas absorbent 123.

[0250] (Specific Gas Recovery Process S70) In the specific gas recovery process S70, the specific gas is recovered from the gas absorption unit. In this embodiment, with the vacuum pump 136 in operation and the first valve 114 and the third valve 144 closed, the second valve 134 and the fourth valve 154 are opened. As a result, the specific gas present inside the gas absorption unit 120 is discharged to the gas tank 156 via the discharge pipe 132 and the specific gas discharge pipe 152.

[0251] In this embodiment, the specific gas separation step S60 is performed under predetermined reduced pressure conditions inside the gas absorption unit 120. This separates the specific gas while the mixed gas and residual gas inside the gas absorption unit 120 are discharged to the outside of the gas absorption unit 120. Furthermore, in the specific gas recovery step S70, the specific gas is recovered by a vacuum pump 136. As a result, a high concentration of the specific gas can be recovered from the gas absorption unit 120.

[0252] In the specific gas recovery step S70, it is preferable that the induction heating device 550 is not operating. As described above, in this embodiment, since the specific gas is discharged by the vacuum pump 136, the temperature inside the gas absorption unit 120 can be quickly lowered. Therefore, when a new cycle is performed after the completion of the specific gas recovery step S70, the mixed gas supply step S10 can be started in a shorter time.

[0253] In the specific gas recovery process S70, as the recovery of the specific gas within the gas absorption unit 120 progresses, the pressure inside the gas absorption unit 120 decreases. Therefore, when the pressure inside the gas absorption unit 120 decreases to below a certain level (for example, below 1000 Pa), it can be determined that the recovery of the specific gas within the gas absorption unit 120 is complete.

[0254] In the recovery method according to this embodiment, it is preferable to perform the mixed gas supply step S10 to the specific gas recovery step S70 with the vacuum pump 136 constantly in operation. This ensures stable operation of the vacuum pump 136.

[0255] As described above, the gas recovery method of this embodiment allows for more efficient separation and recovery of specific gases from a mixed gas. Although not limited to this, in the gas recovery method of this embodiment, specific gases can be recovered from a mixed gas by repeating the mixed gas supply process S10 to the specific gas recovery process S70 as one cycle.

[0256] Figure 20 is a flowchart showing a gas recovery method according to the second embodiment. The gas recovery method according to the second embodiment further includes step S35 between the residual gas discharge step S30 and the gas absorption unit depressurization step S40. Except for this point, it may be the same as the gas recovery method according to the first embodiment, so redundant explanations are omitted. In one preferred embodiment of the recovery method disclosed herein, although not limited thereto, it is preferable to start the gas absorption unit depressurization step S40 when the concentration of a specific gas contained in the residual gas reaches a predetermined concentration or higher.

[0257] (Step S35) In step S35, the concentration of a specific gas in the residual gas discharged in the residual gas discharge step S30 is measured, and it is determined whether the concentration of the specific gas is above a predetermined concentration. In this embodiment, the concentration of the specific gas in the residual gas flowing through the residual gas discharge pipe 142 is measured by a first specific gas concentration meter 148 connected to the residual gas discharge pipe 142. Note that the "predetermined concentration" in this specification is not particularly limited as it varies depending on the saturation absorption amount of the specific gas by the gas absorption unit, the concentration of the specific gas contained in the mixed gas before treatment, etc. For example, when recovering carbon dioxide as a specific gas from air as a mixed gas, the predetermined concentration may be 100 ppm or less.

[0258] Here, if the concentration of the specific gas in the residual gas is less than a predetermined concentration (NO in step S35), the amount of specific gas absorbed by the gas absorption unit 120 can be considered not to be the saturation absorption amount. Therefore, if it is determined that the concentration of the specific gas in the residual gas is less than a predetermined concentration (NO in step S35), the process returns to the mixed gas supply process S10 and the subsequent steps are repeated. In this embodiment, each step S10 to S30 is repeated until it is determined in step S35 that the concentration of the specific gas in the residual gas is at or above a predetermined concentration.

[0259] Furthermore, if the concentration of the specific gas in the residual gas is above a predetermined concentration (YES in step S35), it can be considered that the amount of specific gas absorbed by the gas absorption unit 120 has reached the saturation absorption amount. Therefore, when it is determined that the concentration of the specific gas in the residual gas is above a predetermined concentration (YES in step S35), the gas absorption unit depressurization process S40 is started. According to this configuration, the specific gas adsorbed by the gas absorption unit 120 can be recovered after it has absorbed the specific gas up to its saturation absorption amount. This makes it possible to recover the specific gas more efficiently.

[0260] The timing for measuring the concentration of the specific gas in the residual gas is not particularly limited. For example, the concentration of the specific gas may be measured multiple times during the residual gas discharge process S30, and the average value may be used. Alternatively, the concentration of the specific gas may be measured at the time when the residual gas discharge process S30 is completed.

[0261] <Test Examples> Below, we will describe test examples relating to the second technology disclosed herein, but this is not intended to limit the technology disclosed herein to these test examples.

[0262] <Preparation of Gas Absorber> Here, the gas absorber to be housed in the gas absorption unit of the gas separation and recovery apparatus for each test example was prepared. (Example 1) As the gas absorber for Example 1, a gas absorber comprising a resin matrix, carrier particles, a gas absorbent, and a heating element was prepared. The resin matrix is ​​composed of polysulfone (PSU) and is a porous body formed in the shape of a flat sheet, having a three-dimensional network structure including pores. As the carrier particles, porous silica particles (SiO2) were used. ２ The gas absorbent used in Example 1 is a plain weave metal mesh with the following configuration: Material: SUS304 Mesh count: 60 Wire diameter: 0.14 mm Mesh opening: 0.283 mm Void ratio: 44.4%

[0263] (Example 2) In Example 2, a gas absorber was prepared that had the same configuration as in Example 1, except that a heating element was placed on one surface of a molded body formed in the shape of a flat sheet (i.e., the location of the heating element was different from that in Example 1).

[0264] (Example 3) In Example 3, a gas absorber was prepared that had the same configuration as in Example 1, except that the shape of the resin matrix constituting the gas absorber included a base portion and convex portions that extended from one surface of the base portion and were arranged to extend in a direction perpendicular to the thickness direction of the base portion (hereinafter referred to as "striped").

[0265] (Example 4) In Example 4, a gas absorber was prepared that had the same configuration as in Example 3, except that the heating element was placed on the other surface of the base (the surface without the protrusion).

[0266] (Example 5) In Example 5, a gas absorber was prepared that had the same configuration as in Example 1, except that the shape of the resin matrix constituting the gas absorber included a base portion and convex portions extending from one surface of the base portion and arranged in a staggered pattern.

[0267] (Example 6) In Example 6, a gas absorber was prepared that had the same configuration as in Example 5, except that the heating element was placed on the other surface of the base (the surface without the protrusion).

[0268] (Examples 7 to 12) Here, one more gas absorber was prepared for each of Examples 1 to 6. Then, the gas absorbers corresponding to the gas absorbers in Examples 1 to 6 were designated as Examples 7 to 12, respectively.

[0269] <Construction of Gas Absorption Units> (Examples 1 to 6) Gas absorption units were constructed for installation in gas separation and recovery devices according to each example shown in Figures 14 and 15. First, a roughly rectangular parallelepiped container (300 mm wide, 400 mm deep, 300 mm high, made of stainless steel) was prepared, with an inlet and outlet on opposite sides of its side walls. Then, 150 gas absorbers with heating elements were stacked inside the container for each example. Next, one induction heating device (IH heater) was placed at each end of the stacked gas absorbers in the direction of arrangement (the top and bottom of the container) (a total of two). This constructed the gas absorption units according to Examples 1 to 6.

[0270] (Examples 7 to 12) In Examples 7 to 12, a hot plate was used instead of an induction heating device. Other than this, the process was the same as in Examples 1 to 6. This resulted in the construction of the gas absorption units described in Examples 7 to 12.

[0271] <Preparation of Gas Separation and Recovery System> A gas separation and recovery system with the configuration shown in Figure 13 was prepared. Specifically, it consisted of a mixed gas supply unit, a vacuum pump, and a low-concentration CO2 (detection range: 0 to 1000 ppm). ２ Concentration meter and high-concentration (detection range: 0-100%) CO2 ２A gas separation and recovery apparatus was prepared, equipped with a concentration meter, a wet gas meter, and a valve (vacuum valve). An air cylinder was used as the mixed gas supply source. The inlet of the gas absorption unit was connected to the mixed gas supply pipe of the gas separation and recovery apparatus. The outlet of the gas absorption unit was also connected to the discharge pipe of the gas separation and recovery apparatus. The gas absorption cycle was evaluated using the gas separation and recovery apparatuses prepared in this manner according to Examples 1 to 12.

[0272] <Evaluation of the gas absorption cycle> First, by repeating the following steps (1) and (2), CO in the mixed gas (air) is absorbed. ２ The CO2 was adsorbed onto the gas absorption unit inside the reactor. The vacuum pump was kept running throughout steps (1) to (5). Then, during step (2) below, the CO2 gas discharged from the gas absorption unit was adsorbed onto the gas. ２ When the concentration reaches 390 ppm, it is considered that the gas absorber has reached its saturation absorption capacity, and CO ２ The adsorption process was completed. At this time, the total time spent performing the following steps (1) and (2) (including the time spent repeating them) was calculated as "CO ２ The adsorption time was defined as "adsorption time". Process (1): Open the first valve, close the second to fourth valves, and introduce air (CO) from the mixed gas supply line. ２ A gas at a concentration of 400 ppm is supplied to the gas absorption unit. Step (2): The first and fourth valves are closed, and the second and third valves are opened to completely discharge the residual gas from the gas absorption unit.

[0273] Next, the following steps (3) to (5) are performed, and the CO adsorbed by the gas absorption unit is removed. ２ CO was recovered. Then, when the vacuum gauge reading of the vacuum pump fell below 1 Pa, ２ It is assumed that CO has been completely recovered from the gas absorption unit. ２ The recovery process was completed. At this time, the total time spent on the following steps (3) to (5) was calculated as "CO2". ２The recovery time was defined as "CO2". In Examples 7 to 12, in step (4) below, the gas absorber was heated to approximately 60°C using a hot plate instead of an IH heater. Step (3): Close the first and fourth valves, open the second and third valves, and create a vacuum inside the gas absorption unit (container). Step (4): Close the first to fourth valves, power the IH heater, and raise the heating element to approximately 60°C. Step (5): Close the first and third valves, open the second and fourth valves, and release CO2 from the gas absorption unit. ２ It is collected in a gas tank.

[0274] For each example, the above CO ２ Adsorption time CO ２ The total recovery time was defined as "one cycle time (minutes)". In addition, CO was measured using a wet gas meter during the above steps (3) to (5). ２ The cumulative flow rate is "recovered CO2". ２ The quantity was defined as "L". Furthermore, the CO inside the gas absorption unit ２ The average value of the concentration is "recovered CO2". ２ The concentration was expressed as "percentage (%)". The results are shown in Table 3.

[0275]

[0276] As shown in Table 3, a gas separation and recovery apparatus and recovery method comprising the configuration disclosed herein can be used to separate a specific gas (CO2) from a mixed gas (air). ２ It was confirmed that the ) could be separated and recovered. In addition, in Examples 1 to 6 equipped with an induction heating device (IH heater), the cycle time was significantly reduced compared to Examples 7 to 12 equipped with a hot plate.

[0277] <Measurement of Pressure Loss> Here, the pressure loss was measured for the gas separation and recovery apparatuses according to Examples 1 to 6. Specifically, air was flowed through the gas separation and recovery apparatuses of Examples 1 to 6 at a flow velocity of 3 m / s from the inlet (one opening) of the gas absorption unit. The pressure on the inlet side and the pressure on the outlet side of the gas absorption unit were measured with a pressure gauge, and the pressure loss (Pa) was calculated. The results are shown in Table 4.

[0278]

[0279] As shown in Table 4, in Examples 3 to 6, where the gas absorber is equipped with protrusions, the pressure loss was smaller compared to Examples 1 and 2. This result is thought to be due to the turbulence generated in the gas flow by the protrusions when the gas flows into the gas absorber.

[0280] The apparatus configurations described in the above test examples do not limit the technologies disclosed herein. The gas separation and recovery apparatus and gas recovery method disclosed herein can be implemented as appropriate by changing, for example, the scale of the apparatus configuration.

[0281] The specific examples of the technology disclosed herein have been described in detail above, but these are merely illustrative and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes to the specific examples described above.

[0282] As described above, specific embodiments of the technology disclosed herein include those listed in the following items.

[0283] [Item 1] A gas absorption unit comprising a gas absorber, an induction heating device, and a heating element that generates heat by the induction heating device, wherein the gas absorber comprises a porous resin matrix and gas-absorbing particles, the resin matrix having a three-dimensional network structure including pores, the gas-absorbing particles being arranged within the pores of the resin matrix, and the heating element being arranged in contact with at least a portion of the gas absorber.

[0284] [Item 2] The gas absorption unit according to Item 1, wherein the heating element is arranged in such a state that at least a portion of it is embedded in the resin matrix.

[0285] [Item 3] The gas absorption unit according to item 1 or 2, comprising at least one of metal or carbon as the heating element.

[0286] [Item 4] A gas absorption unit according to any one of items 1 to 3, wherein the heating element is arranged in an area of ​​20% or more of the resin matrix in a plan view, with the area of ​​the resin matrix being 100%.

[0287] [Clause 5] The gas absorption unit according to any one of Clauses 1 to 4, wherein the gas absorption particles comprise carrier particles having a plurality of mesopores and a gas absorbent, and the gas absorbent is disposed in the plurality of mesopores of the carrier particles.

[0288] [Item 6] The gas absorption unit according to Item 5, wherein the carrier particles are composed of an inorganic material or an organometallic structure, and the inorganic material includes at least one of silica, alumina, ceria, zirconia, titania, activated carbon, and zeolite.

[0289] [Item 7] A gas absorption unit according to any one of items 1 to 6, wherein the porosity of the gas absorber based on the Archimedes process is 60% or more and 90% or less.

[0290] [Item 8] The gas absorption unit according to any one of items 1 to 7, wherein the thermal conductivity of the gas absorber is 0.02 W / m·K or more and 1 W / m·K or less.

[0291] [Clause 9] The gas absorption unit according to any one of Clauses 1 to 8, wherein the gas absorbent is in the form of a sheet, and a plurality of the gas absorbents are stacked along a predetermined arrangement direction.

[0292] [Item 10] The gas absorption unit according to item 9, wherein the gas absorber comprises a base portion and a protrusion extending from the surface of the base portion.

[0293] [Item 11] The gas absorption unit according to item 9 or 10, wherein, in a plan view, the positions of the convex portions of the plurality of gas absorbers are substantially the same.

[0294] [Clause 12] The gas absorption unit according to any one of Clauses 9 to 11, wherein the induction heating devices are arranged at the ends of the gas absorbers in the direction of arrangement.

[0295] [Clause 13] The gas absorption unit according to any one of claims 9 to 12, wherein the induction heating device is arranged at at least one end in a direction perpendicular to the arrangement direction of the gas absorbers.

[0296] [Item 14] A gas separation and recovery apparatus for separating and recovering a specific gas from a mixed gas containing at least two or more components, comprising: a gas absorption unit for absorbing the specific gas; an induction heating device; a vacuum pump for reducing the pressure inside the gas absorption unit; a mixed gas supply unit for supplying the mixed gas into the gas absorption unit; and a discharge pipe for discharging the processed gas from the gas absorption unit, wherein the gas absorption unit is equipped with a heating element that generates heat using the induction heating device, and the vacuum pump is connected to the discharge pipe.

[0297] [Clause 15] The apparatus according to Clause 14, wherein the gas absorption unit comprises a plurality of heating elements, the plurality of heating elements being arranged at equal intervals while being spaced apart from each other.

[0298] [Clause 16] The apparatus according to Claim 14 or 15, wherein the heating element comprises at least one of metal or carbon.

[0299] [Clause 17] The apparatus according to any one of Clauses 14 to 16, wherein the gas absorption unit comprises a gas absorbent and a sheet-shaped gas absorbent supporting the gas absorbent, and the heating element is arranged so that at least a portion of it is in contact with the gas absorbent.

[0300] [Clause 18] The apparatus according to Clause 17, wherein the heating element is arranged such that at least a portion of it is embedded in the gas absorber.

[0301] [Clause 19] The apparatus according to Clause 17 or 18, wherein the gas absorbent is in the form of a sheet, and a plurality of the gas absorbents are stacked along a predetermined arrangement direction.

[0302] [Clause 20] The apparatus according to Clause 19, wherein the heating elements are stacked in a direction that coincides with the predetermined arrangement direction in which the gas absorbers are stacked.

[0303] [Clause 21] The apparatus according to any one of Clauses 17 to 20, wherein the gas absorber comprises a base portion and a protrusion extending from the surface of the base portion.

[0304] [Clause 22] The apparatus according to any one of Clauses 17 to 21, wherein the gas absorber comprises a porous resin matrix having a three-dimensional network structure including pores, and the gas absorbent is disposed within the pores of the resin matrix.

[0305] [Clause 23] The apparatus according to Claim 22, wherein the gas absorbent comprises carrier particles, the carrier particles are arranged in the pores of the resin matrix, and the gas absorbent is arranged on the surface of the carrier particles.

[0306] [Item 24] A gas recovery method for recovering a specific gas from a mixed gas containing at least two or more components, comprising: a mixed gas supply step of supplying the mixed gas into a gas absorption unit; a specific gas adsorption step of adsorbing the specific gas from the mixed gas onto the gas absorption unit; a residual gas discharge step of discharging the residual gas after separating the specific gas from the gas absorption unit; a gas absorption unit depressurization step of maintaining the gas absorption unit under depressurization conditions of at least 1000 Pa or less; a gas absorption unit heating step of heating the gas absorption unit by induction heating under the depressurization conditions; a specific gas separation step of separating the specific gas from the gas absorption unit; and a specific gas recovery step of recovering the specific gas from the gas absorption unit.

[0307] [Clause 25] The recovery method according to Clause 24, wherein the gas absorption unit depressurization process is started when the concentration of a specific gas contained in the residual gas reaches a predetermined concentration or higher.

[0308] 1, 200, 300 Gas absorption unit 10 Frame 10h Opening 20, 220, 320 Gas absorbent 22, 222 Resin matrix 24, 224 Pores 26, 226 Gas absorbent particles 26p Pores 30, 330 Heating element 40, 340 Induction heating device 100 Gas separation and recovery device 110 Mixed gas supply unit 120 Gas absorption unit 123 Gas absorbent 132 Discharge pipe 136 Vacuum pump 220b, 320b Base part 220p, 320p Protrusion 227 Carrier particles 227p Pores 228 Gas absorbent 350 Metal plate 510 Gas absorbent 520 Resin matrix 520b Base part 520p Protrusion 522 Pores 530 Carrier particles 532 Pores 540 Heating element 550 Induction heating device S10 Mixed gas supply process S20 Specific gas adsorption process S30 Residual gas discharge process S40 Gas absorption unit depressurization process S50 Gas absorption unit heating process S60 Specific gas separation process S70 Specific gas recovery process

Claims

1. A gas absorption unit comprising a gas absorber, an induction heating device, and a heating element that generates heat by the induction heating device, wherein the gas absorber comprises a porous resin matrix and gas-absorbing particles, the resin matrix having a three-dimensional network structure including pores, the gas-absorbing particles being arranged within the pores of the resin matrix, and the heating element being arranged in contact with at least a portion of the gas absorber.

2. The gas absorption unit according to claim 1, wherein the heating element is arranged such that at least a portion of it is embedded in the resin matrix.

3. The gas absorption unit according to claim 1 or 2, wherein the heating element comprises at least one of metal or carbon.

4. The gas absorption unit according to claim 1 or 2, wherein, in a plan view, when the area of ​​the resin matrix is ​​taken as 100%, the heating element is arranged in an area of ​​20% or more.

5. The gas absorption unit according to claim 1 or 2, comprising carrier particles having a plurality of mesopores and a gas absorbent, wherein the gas absorbent is disposed in the plurality of mesopores of the carrier particles.

6. The gas absorption unit according to claim 5, wherein the carrier particles are composed of an inorganic material or an organometallic structure, and the inorganic material includes at least one of silica, alumina, ceria, zirconia, titania, activated carbon, and zeolite.

7. The gas absorption unit according to claim 1 or 2, wherein the porosity of the gas absorber based on the Archimedes method is 60% or more and 90% or less.

8. The gas absorption unit according to claim 1 or 2, wherein the thermal conductivity of the gas absorber is 0.02 W / m·K or more and 1 W / m·K or less.

9. The gas absorption unit according to claim 1 or 2, wherein the gas absorbent is in the form of a sheet, and a plurality of the gas absorbents are stacked along a predetermined arrangement direction.

10. The gas absorption unit according to claim 9, wherein the gas absorber comprises a base portion and a protrusion extending from the surface of the base portion.

11. The gas absorption unit according to claim 9, wherein, in a plan view, the positions of the convex portions of the plurality of gas absorbers are substantially the same.

12. The gas absorption unit according to claim 9, wherein the induction heating device is arranged at at least one end in the arrangement direction of the gas absorbers.

13. The gas absorption unit according to claim 9, wherein the induction heating device is arranged at at least one end in a direction perpendicular to the arrangement direction of the gas absorbers.

14. A gas separation and recovery apparatus for separating and recovering a specific gas from a mixed gas containing at least two or more components, comprising: a gas absorption unit for absorbing the specific gas; an induction heating device; a vacuum pump for reducing the pressure inside the gas absorption unit; a mixed gas supply unit for supplying the mixed gas into the gas absorption unit; and a discharge pipe for discharging the processed gas from the gas absorption unit, wherein the gas absorption unit is equipped with a heating element that generates heat using the induction heating device, and the vacuum pump is connected to the discharge pipe.

15. The apparatus according to claim 14, wherein the gas absorption unit comprises a plurality of heating elements, and the plurality of heating elements are arranged at equal intervals while being spaced apart from each other.

16. The apparatus according to claim 14 or 15, wherein the heating element comprises at least one of metal or carbon.

17. The apparatus according to claim 14, wherein the gas absorption unit comprises a gas absorbent and a sheet-shaped gas absorbent supporting the gas absorbent, and the heating element is arranged so that at least a portion of it is in contact with the gas absorbent.

18. The apparatus according to claim 17, wherein the heating element is arranged such that at least a portion of it is embedded in the gas absorber.

19. The apparatus according to claim 17 or 18, wherein the gas absorbent is in the form of a sheet, and a plurality of the gas absorbents are stacked along a predetermined arrangement direction.

20. The apparatus according to claim 19, wherein the heating elements are stacked in a direction that coincides with the predetermined arrangement direction in which the gas absorbers are stacked.

21. The apparatus according to claim 17 or 18, wherein the gas absorber comprises a base portion and a protrusion extending from the surface of the base portion.

22. The apparatus according to claim 17 or 18, wherein the gas absorbent comprises a porous resin matrix having a three-dimensional network structure including pores, and the gas absorbent is disposed within the pores of the resin matrix.

23. The apparatus according to claim 22, wherein the gas absorbent comprises carrier particles, the carrier particles are arranged in the pores of the resin matrix, and the gas absorbent is arranged on the surface of the carrier particles.

24. A gas recovery method for recovering a specific gas from a mixed gas containing at least two components, comprising: a mixed gas supply step of supplying the mixed gas into a gas absorption unit; a specific gas adsorption step of adsorbing the specific gas from the mixed gas onto the gas absorption unit; a residual gas discharge step of discharging the residual gas after separating the specific gas from the gas absorption unit; a gas absorption unit depressurization step of maintaining the gas absorption unit under depressurization conditions of at least 1000 Pa or less; a gas absorption unit heating step of heating the gas absorption unit by induction heating under the depressurization conditions; a specific gas separation step of separating the specific gas from the gas absorption unit; and a specific gas recovery step of recovering the specific gas from the gas absorption unit.

25. The recovery method according to claim 24, wherein the gas absorption unit depressurization process is started when the concentration of a specific gas contained in the residual gas reaches a predetermined concentration or higher.

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