gas absorber

Abstract

To provide a gas absorber with improved separation and recovery efficiency for specific components. [Solution] The gas absorber 10 disclosed herein is a gas absorber 10 for absorbing a specific gas to be recovered, and comprises a porous resin matrix 20, gas absorbing particles, and a sheet-like mesh member 40. The resin matrix 20 has a three-dimensional mesh structure including pores 22, and comprises a flat base portion 20b and a plurality of protrusions 20p, the mesh member 40 is arranged along the base portion 20b with at least a portion embedded in the resin matrix 20, and the gas absorbing particles are arranged in the pores 22 of the resin matrix 20.

Description

[Technical Field]

[0001] This disclosure relates to a gas absorber for absorbing specific gases to be recovered. [Background technology]

[0002] Exhaust gases emitted from thermal power plants, factories, automobiles, etc., contain various harmful components, and there is a need for the development of materials and technologies to selectively separate and recover them. For example, carbon dioxide (CO2), one of the harmful components, is a greenhouse gas, and there is a pressing need to drastically reduce its emissions. In order 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. Patent documents 1 and 2 are examples of technologies related to this. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Special Publication No. 2014-506836 [Patent Document 2] Special Publication No. 2018-187574 [Overview of the project] [Problems that the invention aims to solve]

[0004] To efficiently separate and recover specific components from gases, 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 drawback of having a low amount of active substance supported per unit volume because the carrier is only placed on the surface of the substrate.

[0005] In the above-described technique, a method is used in which a specific component is adsorbed onto an active substance, and then heated gas (air) is passed through the carrier to raise the temperature of the active substance, thereby recovering the specific component adsorbed on the active substance. According to further studies by the present inventor, in order to increase the separation and recovery efficiency of the specific component, there is room for improvement not only in increasing the loading amount of the active substance, but also in rapidly raising the carrier temperature and reducing the pressure loss during gas flow.

[0006] The technique disclosed herein has been made in view of the above circumstances, and its main object is to provide a gas absorber with improved separation and recovery efficiency of specific components.

Means for Solving the Problems

[0007] The gas absorber disclosed herein is a gas absorber for supporting an active substance, and includes a porous resin matrix, gas absorption particles, and a sheet-like mesh member. The resin matrix has a three-dimensional network structure including pores, and includes a flat base portion and a plurality of convex portions extending from the surface of the base portion. The sheet-like mesh member is disposed along the base portion of the resin matrix in a state where at least a part thereof is embedded in the resin matrix, and the gas absorption particles are disposed in the pores of the resin matrix.

[0008] According to such a configuration, by disposing the gas absorption particles in the pores of the resin matrix, the loading amount of the active substance can be increased. Further, by disposing the sheet-like mesh member in a state where at least a part thereof is embedded in the resin matrix, the temperature of the entire gas absorber can be rapidly raised to the inside without inhibiting the gas (air) flow path in the gas absorber. And, since the resin matrix includes a flat base portion and a plurality of convex portions extending from the surface of the base portion, turbulence occurs in the gas flow by the convex portions when the gas flows in. Thereby, it is possible to provide a gas absorber with improved separation and recovery efficiency of harmful components.

[0009] In a preferred embodiment of the gas absorber disclosed herein, the plurality of convex portions are arranged so as to extend along a direction orthogonal to the thickness direction of the base portion while being spaced apart from each other.

[0010] In a preferred embodiment of the gas absorber disclosed herein, the plurality of convex portions are arranged in a staggered pattern.

[0011] In a preferred embodiment of the gas absorber disclosed herein, the mesh member is arranged in a state of being embedded in the base portion of the resin matrix.

[0012] In a preferred embodiment of the gas absorber disclosed herein, the gas absorption particles are porous particles having a plurality of mesopores, the average pore diameter A of the resin matrix is 0.4 μm or more and 7 μm or less, and the average pore diameter B of the gas absorption particles is 2 nm or more and 100 nm or less.

[0013] In a preferred embodiment of the gas absorber disclosed herein, the ratio (A / B) of the average pore diameter A of the resin matrix to the average pore diameter B of the gas absorption particles is 20 or more and 200 or less.

[0014] In a preferred embodiment of the gas absorber disclosed herein, the porosity based on the Archimedes method is 70% or more and 90% or less.

[0015] In a preferred embodiment of the gas absorber disclosed herein, the water absorption rate based on the Archimedes method is 150% or more and 350% or less.

[0016] In a preferred embodiment of the gas absorber disclosed herein, the heat-resistant water resistance is 120 °C or more and 250 °C or less.

[0017] In a preferred embodiment of the gas absorber disclosed herein, the gas absorption particles include 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.

[0018] In one preferred embodiment of the gas absorber disclosed herein, the above-mentioned metal mesh member is provided.

[0019] In one preferred embodiment of the gas absorber disclosed herein, the average height of the plurality of protrusions is H ave In that case, at least 80% of the above-mentioned multiple protrusions are 0.5H ave ~1.5H ave It has a height of .

[0020] In one preferred embodiment of the gas absorber disclosed herein, the plurality of protrusions have a flat surface at the tip in the direction of protrusion.

[0021] In one preferred embodiment of the gas absorber disclosed herein, the total area of ​​the flat surfaces is at least 30% of the area of ​​the surface on which the plurality of protrusions are provided in the resin matrix. [Brief explanation of the drawing]

[0022] [Figure 1] Figure 1 is a schematic plan view showing the structure of the gas absorber according to this embodiment. [Figure 2] Figure 2 is a schematic enlarged plan view showing the structure of the gas absorber according to this embodiment. [Figure 3] Figure 3 is a schematic front view showing the structure of the gas absorber according to this embodiment. [Figure 4] Figure 4 is a schematic front view showing the structure of a gas absorber according to the second embodiment. [Figure 5] Figure 5 is a schematic plan view showing the structure of the gas absorber according to the second embodiment. [Figure 6] Figure 6 is a schematic enlarged plan view showing the structure of the gas absorber according to the second embodiment. [Figure 7] Figure 7 is a schematic perspective view showing a gas absorption unit according to one embodiment. [Modes for carrying out the invention]

[0023] Hereinafter, preferred embodiments of the technology disclosed herein will be described 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.

[0024] 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 representing the longitudinal direction, Y the width direction, and Z 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.

[0025] <Gas absorber> Figure 1 is a schematic plan view showing the structure of the gas absorber 10 according to this embodiment. Figure 2 is a schematic enlarged plan view showing the structure of the gas absorber 10 according to this embodiment. Figure 3 is a schematic front view showing the gas absorber 10 according to this embodiment. In Figures 1 to 3, the mesh member 40 is shown by a dashed line. For convenience of explanation, the convex portion 20p is omitted from Figure 2. In Figures 1 and 3, the gas absorbing particles 30 are omitted from the illustration. As shown in Figures 1 to 3, the gas absorber 10 disclosed herein comprises a resin matrix 20, gas absorbing particles 30, and a mesh member 40.

[0026] The gas absorber 10 disclosed herein is a sheet-like gas absorber comprising gas-absorbing particles that absorb various specific gases to be recovered. The type of active substance is not particularly limited and can be appropriately set according to the type of gas to be absorbed.

[0027] The resin matrix 20 contained in the gas absorber 10 disclosed herein has a porous structure having pores 22, as shown in Figure 2. The resin matrix 20 may function as a framework in the gas absorber 10. The resin matrix 20 may be composed, for example, by bonding resin crystalline particles together. The pores 22 may be interconnected pores. A plurality of gas-absorbing particles 30 are arranged within the pores 22. The gas-absorbing particles 30 preferably have a plurality of pores 32. It is preferable that the gas-absorbing particles 30 are mainly separated from the resin matrix 20 and present in the pores 22, and more preferably that the majority are separated from the resin matrix 20 and present in the pores 22. The gas absorber 10 includes a mesh member 40. The fact that the gas absorber 10 has a resin matrix 20, gas-absorbing particles 30, and a mesh member 40 can be confirmed, for example, by observing the surface or cross-section of the gas absorber 10 with a scanning electron microscope (SEM).

[0028] As shown in Figure 2, the gas absorber 10 disclosed herein has gas-absorbing particles 30 arranged in the pores 22 of the resin matrix 20. This allows for the support of more gas-absorbing particles and gas absorbent than conventional gas absorbers. Therefore, the amount of gas-absorbing particles (gas absorbent) per unit volume is increased, improving the recovery and separation performance of the gas to be recovered. Furthermore, the gas absorber 10 has a three-dimensional mesh structure, which provides excellent gas diffusion. This facilitates the flow of gas (air). With a gas absorber 10 having such a configuration, when gas (air) is flowed in the thickness direction of the gas absorber 10, the gas (air) reaches the gas-absorbing particles 30 arranged inside the gas absorber 10, improving the separation and recovery efficiency of the gas to be recovered.

[0029] As shown in FIGS. 1 and 3, the resin matrix 20 disclosed herein includes a base portion 20b and a plurality of convex portions 20p. The base portion 20b is flat. The convex portions 20p extend upward from the surface of the base portion 20b here. According to such a configuration, when gas flows in, turbulence occurs in the gas flow due to the convex portions 20p. Thereby, while reducing the pressure loss during gas inflow, the gas and the active material can be brought into contact more efficiently.

[0030] As shown in FIG. 3, here, the base portion 20b and the convex portions 20p are integrally formed. That is, in the present embodiment, the base portion 20b and the convex portions 20p each include pores 22, and gas absorption particles 30 are disposed in the respective pores 22.

[0031] Although not particularly limited, the porosity of the gas absorber 10 disclosed herein based on the Archimedes method is preferably 70% or more, more preferably 75% or more, and particularly preferably 80% or more. Thereby, the gas and the gas absorption particles or the gas absorbent can be preferably brought into contact. On the other hand, since air has a low thermal conductivity, the lower the porosity of the gas absorber 10, the higher the thermal conductivity of the gas absorber 10. From this, the porosity of the gas absorber 10 based on the Archimedes method is preferably, for example, 90% or less, and may be 86% 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 , the weight in water W Aq , and the water-containing weight W a+w of the gas absorber 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)

[0032] While not particularly limited, the water absorption rate of the gas absorber 10 disclosed herein, based on the Archimedes method, is preferably 150% or more, more preferably 160% or more, even more preferably 170% or more, and may be 190% or more, or 200% or more. Typically, the higher the water absorption rate of the gas absorber 10, the greater the amount of gas-absorbing particles or gas absorbent carried per unit volume, which can improve the separation and recovery performance of the gas to be recovered. From this viewpoint, a higher water absorption rate is preferable, and there is no particular upper limit. For example, the water absorption rate of the gas absorber 10, based on the Archimedes method, may be 350% or less, 330% or less, or 300% or less. Note that the "water absorption rate of the gas absorber" can be calculated based on the Archimedes method. More specifically, the dry weight W of the gas absorber Air , underwater weight W Aq , water content W a+w The water absorption rate (Aw) can be calculated by measuring the water absorption rate and using the following formula (2). Aw(%)=(W a+w -W Air ) / W Air ×100···(2)

[0033] While not particularly limited, the gas absorber 10 preferably has high resistance to hot water. The heat resistance of the gas absorber 10 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 10 disclosed herein to be suitably used even in environments exceeding 100°C or in relatively humid environments. The heat resistance of the gas absorber 10 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.

[0034] The shape and size of the base portion 20b are not particularly limited, as they can be changed depending on the usage of the gas absorber 10. For example, the shape of the base portion 20b can be rectangular, circular, polygonal, or strip-shaped. As shown in Figure 1, the base portion 20b in this embodiment is rectangular. Thickness H of the base portion 20b b The thickness of the base portion 20b is not particularly limited, but may be, for example, 0.02 mm or more and 15 mm or less. In this specification, "thickness H b " refers to the length of the perpendicular line drawn from the surface of the base portion 20b on which the convex portion 20p is provided, to the point on the other surface that is closest to the bottom surface, when viewed in the thickness direction of the gas absorber 10.

[0035] As shown in Figures 1 and 3, in the resin matrix 20 of this embodiment, the multiple protrusions 20p are spaced apart from each other and extend along a direction perpendicular to the thickness direction of the base portion 20b (here, the Y-axis direction) (in other words, arranged in a stripe pattern). This allows for suitable turbulence to be generated in the gas. The spacing between the multiple protrusions 20p may be equal or unequal.

[0036] In the resin matrix 20 of this embodiment, the multiple protrusions 20p are arranged only on the surface of one side of the base portion 20b. However, the invention is not limited to this, and additional multiple protrusions 20p may be provided on the other side of the base portion 20b. In other words, in some embodiments, the resin matrix 20 may have protrusions 20p on both sides.

[0037] As shown in Figure 3, the protrusion 20p is columnar in this embodiment. Furthermore, the protrusion 20p has a flat surface 20A at its tip in the protruding direction. While not limited to this, it is preferable that multiple protrusions 20p have flat surfaces 20A at their tips in the protruding direction. This configuration allows for further improvement of the heat conduction efficiency of the gas absorber 10. The area of ​​the flat surface 20A is preferably set to 60% to 100% of the cross-sectional area of ​​the base end portion 20C of the protrusion 20p. Therefore, the protrusion 20p may be tapered, with its diameter gradually decreasing in the protruding direction. In this embodiment, the base end portion 20C of the protrusion 20p refers to the boundary between the protrusion 20p and the base portion 20b (see Figure 3).

[0038] In this embodiment, from the viewpoint of improving the thermal conductivity efficiency of the gas absorber 10, the total area of ​​the flat surfaces 20A of the protrusions 20p relative to the total area of ​​the surface on which the protrusions 20p are provided in the resin matrix 20 is, for example, 30% or more, 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 10, the total area of ​​the flat surfaces 20A of the protrusions 20p relative to the total area of ​​the surface on which the protrusions 20p are provided in the resin matrix 20 is preferably 90% or less, more preferably 80% or less, and even more preferably 70% or less.

[0039] While not particularly limited, from the viewpoint of suitably generating turbulence in the gas, the height H of the protrusion 20p is... 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 gas absorption, the height H of the protrusion 20p p The height of the protrusion 20p is, for example, 50 mm or less, and preferably 10 mm or less. p " refers to the length of the perpendicular line drawn from the apex of the convex portion 20p to the point on the base portion 20b closest to the convex portion 20p, when viewed in the thickness direction of the gas absorber 10.

[0040] Although not limited to this, the average height of the protrusions 20p of the resin matrix 20 is H ave In this case, at least 80% of the provided protrusion 20p is 0.5H ave~1.5H ave It is preferable that it has a height of 0.7H ave ~1.3H ave It 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 average height H of the convex portion 20p of the resin matrix 20. ave The smaller the variation (i.e., closer to 1), the more efficiently the heat conduction of the gas absorber 10 can be made.

[0041] The average pore size A of the resin matrix 20 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 30 to be suitably supported on the resin matrix 20. If the average pore size A of the resin matrix 20 is too large, the gas-absorbing particles 30 may detach from the resin matrix 20. From this viewpoint, the average pore size A of the resin matrix 20 is preferably, for example, 7 μm or less, more preferably 5 μm or less, and even more preferably 3 μm or less. The "average pore size of the resin matrix" can be determined by a mercury intrusion method using a commercially available mercury porosimeter.

[0042] The resin matrix 20 contains a resin, and may be constructed by bonding crystalline particles of the resin. While not particularly limited, the resin matrix 20 preferably contains a resin with a glass transition temperature (Tg) of 70°C or higher. This improves the heat resistance of the gas absorber 10. The glass transition temperature of the resin in the resin matrix 20 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 in the resin matrix 20 may also 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 methods such as differential scanning calorimetry (DSC) measurement or dynamic viscoelasticity measurement (DMA method).

[0043] Furthermore, although not particularly limited, the resin matrix 20 preferably contains a resin with high heat water resistance. This can improve the heat water resistance of the gas absorber 10. The heat water resistance of the resin contained in the resin matrix 20 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 20 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.

[0044] The resin content is not particularly limited, but is preferably 2% to 20% by mass, more preferably 3% to 15% by mass, and even more preferably 5% to 10% by mass, when the total mass of the gas absorber 10 is considered as 100% by mass. This allows for a favorable improvement in the water absorption of the gas absorber 10.

[0045] While not particularly limited, the resin components included in the resin matrix 20 include acrylic resins, cellulose resins, and resins classified as super engineering plastics. The resin matrix 20 may contain any one of the above-mentioned resins alone, or it may contain a combination of two or more.

[0046] 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, polymethyl methacrylate (PMMA), etc. Among these, the acrylic resin used in the resin matrix 20 preferably contains methacrylic acid and / or PMMA.

[0047] 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 20 preferably contains ethylcellulose.

[0048] 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 20 preferably contains PEI, PES, PVDF, PSU, PPSU, etc.

[0049] The gas-absorbing particles 30 are particles that absorb a specific gas to be recovered. The gas-absorbing particles 30 may absorb the specific gas to be recovered by the particles themselves. Furthermore, as will be described in detail later, the gas-absorbing particles 30 may be in a form in which a carrier particle carries a gas absorbent, and the specific gas may be absorbed by the gas absorbent. In other words, the gas-absorbing particles 30 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).

[0050] The shape of the gas-absorbing particles 30 is not particularly limited and may be spherical or non-spherical. Examples of non-spherical gas-absorbing particles 30 include plate-like, flaky, or irregularly shaped particles.

[0051] When spherical gas-absorbing particles 30 are used, the aspect ratio of the gas-absorbing particles 30 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 30 are used, the aspect ratio of the gas-absorbing particles 30 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 30 with such high aspect ratios allows for a suitable increase in the specific surface area of ​​the gas-absorbing particles 30, 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 30 is preferably 5 or less, more preferably 4 or less, and particularly preferably 3 or less. Furthermore, the gas-absorbing particles 30 may be in the form of a so-called mixed powder, which is a mixture of spherical and non-spherical particles.

[0052] The type of particles used for the gas-absorbing particles 30 is not particularly limited and can be appropriately selected depending on the type of gas to be recovered. For example, the gas-absorbing particles 30 may be composed of inorganic materials or metal-organic frameworks (MOFs). When the gas-absorbing particles 30 are composed of inorganic materials, examples of inorganic materials that can be used include zeolite, carbon, activated carbon, glass, clay minerals, and diatomaceous earth. 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.

[0053] The average particle size of the gas-absorbing particles 30 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 30 is too small, the gas-absorbing particles 30 tend to be difficult to disperse in the gas absorber 10. From this viewpoint, the average particle size of the gas-absorbing particles 30 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 30 increases. From this viewpoint, the average particle size of the gas-absorbing particles 30 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.

[0054] From the viewpoint of increasing the contact area between the active substance and the gas to be recovered, it is preferable that the specific surface area of ​​the gas absorption particles 30 be large. Although not particularly limited, the specific surface area of ​​the gas absorption particles 30 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 / g, and 150m 2 / g or more 400m 2 It is more preferable that the value be 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.

[0055] The content of the gas-absorbing particles 30 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 10 is considered as 100% by mass. This allows for a favorable improvement in the adsorption efficiency of the gas to be recovered by the gas-absorbing particles 30.

[0056] As shown in Figure 2, the gas-absorbing particles 30 according to this embodiment have a plurality of pores 32. Although not limited to this, the gas-absorbing particles 30 are preferably porous particles having a plurality of mesopores. In other words, the gas-absorbing particles 30 may be, for example, a mesoporous material having mesopores. With such a configuration, the contact area between the gas-absorbing particles 30 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 30 in this embodiment are arranged in the pores 22 of the resin matrix 20. This allows the gas-absorbing particles 30 to exist in a state where the pores 32 of the gas-absorbing particles 30 are not crushed or filled with resin.

[0057] "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 32 is an example of a "mesopore." The presence of pore 32 in the gas-absorbing particle 30 can be confirmed, for example, by observing the surface or cross-section of the gas-absorbing particle 30 with a scanning electron microscope (SEM).

[0058] When the gas-absorbing particles 30 have multiple mesopores, the average pore diameter B of the gas-absorbing particles 30 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 32 when it is supported. The average pore diameter B of the gas-absorbing particles 30 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 30, 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 analyzer for the gas absorber, using a gas adsorption method based on the BJH method.

[0059] While not particularly limited, in the gas absorber 10, the ratio (A / B) of the average pore diameter A of the resin matrix 20 to the average pore diameter B of the gas absorbent particles 30 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, it is preferable that the gas absorber 10 has a structure that includes both relatively small pores (e.g., mesopores less than 50 nm) derived from the gas absorbent particles 30 and relatively large pores (e.g., pores of 0.5 μm or more) derived from the pores 22 of the resin matrix 20. This allows for a favorable improvement in the adsorption efficiency of the gas to be recovered by the gas absorber 10.

[0060] While not particularly limited, in the gas absorber 10, the mass ratio of the gas-absorbing particles 30 to the resin constituting the resin matrix 20 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 20 and the average pore size B derived from the gas-absorbing particles 30, thereby improving the adsorption efficiency of the gas to be recovered by the gas absorber 10.

[0061] The mesh member 40 is a sheet-like member having a plurality of holes (openings). The gas absorber 10 disclosed herein includes the mesh member 40, which is arranged along the base portion 20b with at least a portion of it embedded in the resin matrix 20. In this specification, "mesh member" means a member having a plurality of openings (holes) that penetrate the sheet, and is not limited to a mesh structure.

[0062] When separating and recovering a specific gas to be recovered using a gas absorber equipped with an active substance (e.g., gas-absorbing particles, gas absorbent, etc.), the following method is used. First, a mixed gas (e.g., air) is passed through the gas absorber, and the specific gas contained in the mixed gas is separated by adsorption onto the active substance. Then, by heating the gas absorber to a predetermined temperature, the gas to be recovered that has been adsorbed onto the active substance is desorbed from the gas absorber and recovered. In order to efficiently separate and recover the gas to be recovered, it is necessary to heat the gas absorber to a predetermined temperature quickly.

[0063] As shown in Figures 1-3, the gas absorption unit disclosed herein includes a mesh member 40. The mesh member 40 is characterized by being positioned in contact with the gas absorber 10. This improves the thermal conductivity of the gas absorber 10. More specifically, when the gas absorber 10 is heated, the mesh member 40 retains heat. Then, heat is conducted throughout the gas absorber 10 via the mesh member 40, allowing the temperature of the entire gas absorber 10 to be rapidly raised to the interior. This improves the recovery efficiency of the gas to be recovered adsorbed on the gas absorption particles 30. Furthermore, since the mesh member 40 has multiple holes and is positioned along the base portion 20b, it does not obstruct the flow path of gas (air) in the thickness direction of the gas absorber 10, and prevents the contact area between the gas absorption particles 30 of the gas absorber 10 and the gas (air) from becoming small. This allows for more efficient contact between the gas absorption particles 30 positioned inside the gas absorber 10 and the gas to be recovered, improving separation and recovery efficiency.

[0064] While not particularly limited, it is preferable to use a material with good thermal conductivity for the mesh member 40. For example, it is preferable that the mesh member 40 comprises at least one of metal or carbon. Examples of the above metals include SUS, iron-chromium-aluminum alloy (kanthal wire), nickel-chromium alloy (nichrome wire), molybdenum, tungsten, platinum, tantalum, tungsten, silicon carbide, molybdenum silicide, lanthanum chromite, carbon, molybdenum disilicide, and the like.

[0065] For example, the mesh member 40 can be a mesh structure such as wire mesh or carbon mesh, or a member with multiple through holes (for example, perforated metal). The thickness of the mesh member 40 is not particularly limited and may be, for example, 0.02 mm or more and 15 mm or less.

[0066] When a mesh structure is used as the mesh member 40, 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.

[0067] While not limited to this, when a mesh structure is used as the mesh member 40, the wire diameter of the mesh member 40 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 10 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 30 arranged inside the gas absorber 10 into contact with the gas to be recovered, the wire diameter of the mesh member 40 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 mesh member" can be measured using a caliper or the like.

[0068] While not limited to this, when a mesh structure is used as the mesh member 40, the mesh opening of the mesh member 40 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 10 and allows the gas-absorbing particles 30 placed inside the gas absorber 10 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 10, the mesh opening of the mesh member 40 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 mesh member" is first obtained by counting the number of holes in one side of the mesh member over 1 inch (25.4 mm). Then, based on the obtained mesh number and wire diameter (mm), it can be calculated as "mesh opening of mesh member (mm) = (25.4 / mesh number) - wire diameter (mm)".

[0069] The void ratio of the mesh member 40 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 10 and allows for more efficient contact between the gas-absorbing particles 30 arranged inside the gas absorber 10 and the gas to be recovered. On the other hand, from the viewpoint of suitably raising the temperature of the gas absorber 10, the void ratio of the mesh member 40 is preferably 90% or less, more preferably 85% or less, and even more preferably 80% or less. Note that when a mesh member with a mesh structure is used, the "void ratio of the mesh member (%) = (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 mesh member, 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 "space ratio of the mesh member." Since such formulas are well known to those skilled in the art, they are omitted here.

[0070] As shown in Figure 3, in this embodiment, one mesh member 40 is provided for each gas absorber 10. However, the number of mesh members provided for one gas absorber is not limited to this. Depending on the shape (thickness) of the gas absorber and the desired thermal conductivity of the gas absorber, multiple (two or more) mesh members may be provided for one gas absorber 10.

[0071] As shown in Figure 3, in this embodiment, the mesh member 40 is positioned approximately at the center of the base portion 20b when viewed in the thickness direction of the gas absorber 10. However, it is not limited to this, and the mesh member 40 may be positioned off-center to the upper or lower side of the base portion 20b when viewed in the thickness direction of the gas absorber 10. Also, a part of the mesh member 40 may be positioned exposed from the surface of the resin matrix 20 (upper or lower side when viewed in the thickness direction). In some preferred embodiments, it is preferable that the mesh member 40 is embedded in the base portion 20b of the resin matrix 20. In other words, in some embodiments, the mesh member 40 can be supported on the resin matrix 20. This allows the mesh member 40 and the gas absorber 10 to make more reliable contact, and thus the temperature of the gas absorber 10 can be more effectively raised by the mesh member 40.

[0072] As shown in Figure 1, in this embodiment, the mesh member 40 is arranged over the entire area of ​​the resin matrix 20 in a plan view. However, it is not limited to this, and the mesh member 40 may be arranged in a part of the area of ​​the resin matrix 20 in a plan view. Also, the mesh member 40 may be arranged so as to protrude (be exposed) from the edges in the width direction and / or longitudinal direction of the resin matrix 20. Although not limited to this, from the viewpoint of suitably raising the temperature of the gas absorber 10, it is preferable to arrange the mesh member 40 in an area of ​​20% or more, and more preferable to arrange the mesh member 40 in an area of ​​30% or more, when the area of ​​the resin matrix 20 in a plan view is taken as 100%.

[0073] The means for heating the gas absorber 10 are not particularly limited and include, for example, direct heating, indirect heating, electric heating, and induction heating (IH). Alternatively, the gas absorber 10 can be heated by circulating heated gas through it.

[0074] While not limited thereto, in some preferred embodiments, the mesh member 40 may be a mesh member that generates heat when an electric current is passed through it. For example, the mesh member 40 is connected to an electrode (not shown), and an electric current is passed through the mesh member 40. This causes the mesh member 40 to generate heat, which can raise the temperature of the gas absorber 10 from the inside. Examples of the mesh member that can be used include iron-chromium-aluminum alloy (kanthal wire), an alloy mainly composed of nickel and chromium (nichrome wire), molybdenum, tungsten, platinum, tantalum, tungsten, silicon carbide, molybdenum silicide, lanthanum chromite, carbon, molybdenum disilicide, and the like.

[0075] While not limited to these, in some preferred embodiments, the mesh member 40 may be equipped with a heat exchange member. For example, the mesh member 40 is connected to a heating means (not shown) provided outside the gas absorber 10. This heats the mesh member 40 via the heating means, thereby raising the temperature of the gas absorber 10 from the inside. Examples of the heat exchange member include multi-tube heat exchangers, plate heat exchangers, fin-tube heat exchangers, coil heat exchangers, spiral heat exchangers, jacket heat exchangers, non-metallic heat exchangers, spiral heat exchangers, direct-contact heat exchangers, air-cooled heat exchangers, water-cooled heat exchangers, and immersion heat exchangers.

[0076] The gas absorber 10 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 10. 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 10 is not particularly limited, but from the viewpoint of transferring heat throughout the gas absorber 10, it is preferable that the thermally conductive fibers are uniformly dispersed in the resin matrix 20. The length of the thermally conductive fibers is not particularly limited, but for example, it may be 10 μm or more and 0.5 mm or less. When the gas absorber 10 is equipped with thermally conductive fibers, the proportion of thermally conductive fibers to the total gas absorber 10 is not particularly limited, as it can be adjusted depending on the thermally conductive fibers used and the temperature at which the gas absorber 10 is used, but for example, when the total mass of the gas absorber 10 is 100% by mass, the proportion may be 5% by mass or more and 30% by mass or less.

[0077] The gas absorber 10 disclosed herein has been described above. As stated above, the gas absorber 10 disclosed herein improves the separation and recovery efficiency of the gas to be recovered. Such a gas absorber 10 can be suitably used in direct air recovery (DAC) systems, hydrogen recovery systems, volatile organic compound (VOC) recovery systems, incineration exhaust gas recovery systems, automobile exhaust gas recovery systems, wastewater oil recovery systems, fluorine recovery systems, boron recovery systems, arsenic recovery systems, selenium recovery systems, phosphorus recovery systems, organofluorine compound (PFAS) recovery systems, colloid recovery systems, metal recovery systems, organometallic recovery systems, metal ion recovery systems, sludge recovery systems, chemical activator recovery systems, radioactive material recovery systems, and the like.

[0078] <Other Embodiments> One embodiment of the gas absorber disclosed herein has been described above. 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.

[0079] In the above embodiment, the protrusions 20p were arranged in a stripe pattern along the Y-axis. The shape of the protrusions 20p is not limited to this. For example, the protrusions 20p may extend in the X-axis direction, or in a direction intersecting the X-axis and Y-axis directions (diagonal direction). Furthermore, the shape of the protrusions 20p is not limited to this, and may be, for example, dot-shaped, island-shaped, dashed-line-shaped, etc.

[0080] <Second Embodiment> Figure 4 is a schematic front view showing the structure of the gas absorber 110 according to the second embodiment. Figure 5 is a schematic plan view showing the structure of the gas absorber 110 according to the second embodiment. Figure 6 is a schematic enlarged plan view showing the structure of the gas absorber 110 according to the second embodiment. In the second embodiment, a resin matrix 120 is provided instead of the resin matrix 20. Also, in the second embodiment, gas absorbing particles 130 are provided instead of the gas absorbing particles 30. Note that other than these points, it may be the same as the above embodiment and has already been described, so redundant descriptions are omitted.

[0081] As shown in Figure 4, in the second embodiment, the multiple protrusions 120p of the resin matrix 120 are dot-shaped when viewed from above, and the multiple protrusions 120p are arranged in a staggered pattern. Even with this configuration, turbulence can be generated in the gas flow. Also, as shown in Figures 4 and 5, the protrusions 120p are cylindrical in this case. However, the shape of the protrusions 120p is not limited to this, and may be triangular prisms, square prisms, polygonal prisms, etc. Furthermore, the configuration of the gas absorber 110 is the same as that of the gas absorber 10 according to the above embodiment, except that the arrangement of the protrusions 120p is different. In this embodiment, "the multiple protrusions 120p are arranged in a staggered pattern" means that adjacent protrusions 120p in the first direction P are offset from each other in the second direction Q, but adjacent protrusions 20p that are one position apart in the first direction P are arranged so that they are in the same position in the second direction Q. The first direction P is defined, for example, by a straight line connecting any adjacent protrusions 120p, and in Figure 4, it represents the direction from the rear to the front. The second direction Q is perpendicular to the first direction P, and in Figure 4, it represents the direction from left to right.

[0082] As shown in Figure 6, in the second embodiment, the gas-absorbing particle 130 comprises a carrier particle 132 and a gas absorbent 134. The fact that the gas-absorbing particle 130 comprises a carrier particle 132 and a gas absorbent 134 can be inferred, for example, by thermogravimetric analysis (TG).

[0083] The carrier particles 132 are particles that support the gas absorbent 134. As shown in Figure 6, the carrier particles 132 have multiple pores 133, which are mesopores. As shown in Figure 6, the carrier particles 132 are arranged in the pores 122 of the resin matrix 120. Here, the carrier particles 132 are porous particles having multiple mesopores, and the gas absorbent 134 is arranged in the pores 133 of the carrier particles 132. The carrier particles 132 may be, for example, a mesoporous material having mesopores.

[0084] The carrier particles 132 may be any inorganic porous material capable of supporting the gas absorbent 134. For example, the carrier particles 132 are preferably porous materials with a relatively large specific surface area. The carrier particles 132 may be composed of, for example, an inorganic material or an organometallic frame (MOF). When the carrier particles 132 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 132 preferably contain silica particles.

[0085] From the viewpoint of increasing the amount of gas absorbent 134 carried, it is preferable that the oil absorption capacity of the carrier particles 132 is high. Although not particularly limited, the oil absorption capacity of the carrier particles 132 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 using a general absorption capacity measuring device, with DBP (dibutyl phthalate) as the reagent liquid, in accordance with JIS K6217-4:2008.

[0086] Furthermore, the composition of the carrier particles 132 (aspect ratio, average particle size, specific surface area, average pore diameter, etc.) is the same as that of the gas-absorbing particles 30 described above, except for the points mentioned above. Also, the composition of the pores 133 of the carrier particles 132 is the same as that of the pores 32 of the gas-absorbing particles 30 described above, except for the points mentioned above. For this reason, explanations of these overlapping elements will be omitted.

[0087] The gas absorbent 134 is placed (supported) on the carrier particles 132. As shown in Figure 6, here the gas absorbent 134 is placed in multiple pores 133 of the carrier particles 132. Preferably, the gas absorbent 134 is placed, for example, in the mesopores of the carrier particles 132.

[0088] 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, when the gas to be absorbed is an acidic gas (e.g., CO2, H2S, etc.), amine compounds can be preferably used as the gas absorbent. Alternatively, when the gas to be absorbed is a basic gas, iron sulfate (FeSO4) or metaphosphoric acid (HPO3) can be used as the gas absorbent.

[0089] Amine compounds include, for example, at least one primary amino group (NH2 - These are various compounds having a primary amino group. In addition to a primary amino group, the amine compound may also contain a secondary amino group and / or a tertiary amino group. The amine compound may be solid or liquid at room temperature. Some amine compounds become solid when adsorbing gas (e.g., CO2 adsorption) and become liquid when desorbing gas (e.g., CO2 desorption) (e.g., isoholodiamine). Such amine compounds may be used as gas absorbents.

[0090] 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 alone or in combination of two or more. In particular, the amine compound preferably contains polyalkylene imines such as polyethyleneimine and polypropyleneimine.

[0091] While not limited thereto, the amount of gas absorbent 134 supported on the gas absorber 110 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 110 disclosed herein is not limited to a specific amount of gas absorbent 134 supported. As described above, the gas absorber 110 disclosed herein has a structure with excellent gas diffusion properties. Therefore, according to the technology disclosed herein, even when the amount of gas absorbent 134 supported is small, the adsorption performance of the gas to be recovered can be improved.

[0092] In the second embodiment, the gas absorbent 134 is arranged in a plurality of pores 133 of the carrier particles 132. However, this configuration does not limit the gas absorbent 134 to being arranged only in the pores 133 of the carrier particles 132. For example, the gas absorbent 134 may be arranged on the surface of the carrier particles 132 in addition to the pores 133 of the carrier particles 132. Alternatively, the gas absorbent 134 may be arranged on the surface and pores 122 of the resin matrix 120.

[0093] As shown in Figure 5, in the second embodiment, the mesh member 140 is positioned such that a portion of the mesh member 140 is exposed from the side of the base portion 120b of the resin matrix 120 where the protrusions 120p are not located. In this configuration as well, the gas absorber 110 can be heated rapidly by the mesh member 140. The configuration of the mesh member 140 is the same as that of the mesh member 40 in the above embodiment, except for the difference in arrangement.

[0094] <Gas Absorption Unit> Next, an example of an application of the gas absorber 10 disclosed herein will be described. Figure 7 is a schematic perspective view of a gas absorption unit 500 according to one embodiment. In Figure 7, the direction of gas flow is indicated by white arrows. Although not limited thereto, the gas absorption unit 500 according to this embodiment comprises a frame 510 and a gas absorber 10.

[0095] The gas absorption unit 500 is configured to absorb, for example, the 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, and gases generated in the iron and steel manufacturing process and / or the manufacturing process of steel products. The gas to be absorbed may be, for example, various acidic gases, various basic gases, carbon monoxide, oxygen, nitrogen, hydrogen, etc.

[0096] Examples of acidic gases include carbon dioxide (CO2), hydrogen sulfide (H2S), carbon disulfide (CS2), carbonyl sulfide (COS), mercaptan (R-SH, where "R" is an alkyl group having 1 to 20 carbon atoms), and 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.

[0097] As shown in Figure 7, in this embodiment, a plurality of gas absorbers 10 are stacked in a predetermined arrangement direction (the Z direction in this embodiment) and held by a frame 510. As shown in Figure 7, a pair of openings 510h are formed at both ends of the frame 510. The pair of openings 510h serve as gas vents. In other words, when the gas intake unit is in use, gas flows in from one opening 510h and is discharged from the other opening 510h. In this embodiment, the frame 510 has a flattened, bottomed rectangular parallelepiped shape. However, the external shape of the frame 510 is not particularly limited and can be appropriately changed depending on the shape of the gas absorber 10 and the device to which it is applied, for example, it can be cylindrical, cubic, polygonal columnar, etc.

[0098] As shown in Figure 7, when multiple gas absorbers 10 are stacked, the protrusions 20p of the gas absorbers 10 are in contact with adjacent gas absorbers 10 (in this case, the base portion 20b). This creates a space S between adjacent gas absorbers 10. This space S acts as a gas flow path when gas is introduced into the gas absorption unit 500. Furthermore, when gas flows into the space S, the protrusions 20p of the gas absorbers 10 can create turbulence in the gas flow. This improves the contact efficiency between the active material and the gas while reducing pressure loss.

[0099] In this embodiment, the gas absorbers 10 are stacked so that the protrusions 20p of each gas absorber 10 are in contact with the base portion 20b of the adjacent gas absorber 10. However, the configuration is not limited to this, and the gas absorbers 10 may be stacked so that the protrusions 20p of each gas absorber 10 are in contact with the protrusions 20p of the adjacent gas absorber 10. Alternatively, the gas absorbers 10 may be stacked so that the base portion 20b of each gas absorber 10 is in contact with the base portion 20b of the adjacent gas absorber 10. Furthermore, in this configuration, the gas absorbers 10 are stacked so that the positions of the protrusions 20p of each gas absorber 10 are substantially the same in a plan view. However, the configuration is not limited to this, and the gas absorbers may be stacked with the protrusions 20p of each gas absorber 10 offset in a plan view.

[0100] The stacking direction of the gas absorbers 10 is not particularly limited, but it is preferable that the gas absorbers 10 be stacked in a direction substantially perpendicular to the gas flow direction (white arrow in Figure 7). This allows for a suitable reduction in pressure loss when gas flows in.

[0101] The material constituting the frame 510 is not particularly limited, but for example, iron, stainless steel, etc. may be used. Furthermore, the method of holding the gas absorber 10 is not limited to the frame 510, and for example, multiple gas absorbers 10 may be fixed with an adhesive. As the adhesive, for example, 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, hot melt adhesives, etc. can be used.

[0102] <Method for manufacturing gas absorbers> Next, an example of a method for manufacturing the gas absorber 10 disclosed herein will be described. The method for manufacturing the gas absorber 10 disclosed herein may include a preparation step, a molding step, an immersion step, and a first drying step. However, the gas absorber 10 disclosed herein is not limited to those manufactured by the following manufacturing method.

[0103] In the preparation step, a slurry-like composition (slurry for gas absorber formation) containing at least gas-absorbing particles 30, a resin, and an organic solvent is prepared. In this specification, the term "slurry" is used to include forms also called "paste" and "ink."

[0104] As an example, in the preparation step, gas-absorbing particles 30 are added to an organic solvent and stirred. This disperses the gas-absorbing particles 30 in the organic solvent. Next, the resin is added to the organic solvent in which the gas-absorbing particles 30 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 30 and the resin to the organic solvent and stir while heating it to 40°C to 60°C. Details of the gas-absorbing particles 30 and the resin prepared in the preparation step have already been explained, so redundant explanations will be omitted.

[0105] When the gas-absorbing particles 30 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.

[0106] 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. The content of the organic solvent in the slurry for forming the gas absorber is preferably, for example, 30% to 80% by mass. This allows for the suitable production of molded articles in the molding process.

[0107] 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 additive content 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.

[0108] In the molding process, the molded body is formed using the gas absorbent slurry and mesh member 40 prepared above. The mesh member 40 described above can be suitably used as the mesh member 40. For example, a sheet-like molded body can be produced by supplying the gas absorbent slurry to a metal substrate with 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 absorbent slurry into a predetermined shape, printing on a metal plate or metal mesh, or dip coating a core material.

[0109] While not limited to this, when performing the molding process using a squeegee, a gas absorber having a base portion and a convex portion can be manufactured by using a metal plate having multiple recesses or a metal plate having multiple through holes (e.g., 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 convex portion 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 convex portion in the gas absorber 10. Furthermore, conventionally known metal substrates can be used without particular limitation, for example, aluminum can be used.

[0110] The position of the mesh member 40 placed on the gas absorber 10 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 mesh member 40. For example, the molded body may be manufactured by supplying the slurry for forming the gas absorber onto the mesh member 40. Alternatively, the molded body may be manufactured by supplying the slurry for forming the gas absorber and then placing the mesh member 40 on top of the slurry.

[0111] For example, when performing the molding process using a squeegee, the following method can be used. First, the mesh member 40 is placed on a metal substrate. At this time, it is placed so that there is a gap between the metal substrate and the mesh member 40. This gap can be adjusted as appropriate according to the thickness of the gas absorber 10 to be manufactured. Next, the slurry for forming the gas absorber is supplied onto the mesh member 40. Then, by squeezing the supplied slurry using a squeegee, a portion of the slurry passes through the mesh of the mesh member 40 and moves between the mesh member 40 and the glass substrate. As a result, at least a portion of the mesh member 40 is embedded in the slurry for forming the gas absorber. At this time, the position of the mesh member 40 that will be placed on the gas absorber 10 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 mesh member 40, the force applied to the squeegee, etc.).

[0112] 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 22, and when the resin precipitates, the resin matrix 20 described above is suitably formed. Since the gas-absorbing particles 30 are dispersed in the organic solvent, the resin matrix 20 is formed to enclose the gas-absorbing particles 30, and the gas-absorbing particles 30 are positioned in the pores 22 of the resin matrix 20.

[0113] 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, 2 hours or more. The temperature conditions for the immersion process are, for example, cold (around 10°C).

[0114] In the first drying step, the molded body after the immersion step is dried to remove the aqueous solvent from the molded body. This allows for the suitable production of a gas absorber 10 comprising a resin matrix 20, gas-absorbing particles 30, and a mesh member 40. The drying means in the first drying step are 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 can be set to, for example, 40°C to 120°C, preferably 60°C to 100°C. The drying time can also be appropriately selected depending on the type and amount of aqueous solvent, and is not particularly limited. The drying time can be appropriately set 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.

[0115] <Second manufacturing method> Next, a second method for manufacturing the gas absorber disclosed herein will be described. The second 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.

[0116] 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.

[0117] 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.

[0118] In the second drying step, the gas absorber precursor obtained in the first drying step is dried to remove moisture from the gas absorber precursor. This allows more gas absorbent to be supported on the carrier particles in the subsequent introduction step. There is no intention to limit the technology disclosed herein, but the reason for this effect 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.

[0119] 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.

[0120] 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.

[0121] 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 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, a solution can be prepared by dissolving the amine compound in an organic solvent (e.g., a lower alcohol such as ethanol), and the amine compound can be introduced by immersing the gas absorbent precursor in this solution. Alternatively, the amine compound can be introduced into the gas absorbent precursor by placing it in an atmosphere in which the amine compound is in the gas phase.

[0122] 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 approximately 20 to 60 parts by mass per 100 parts by mass of the gas absorbent precursor after the second drying process.

[0123] 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.

[0124] <Example Test> The following describes test examples relating to the technology disclosed herein, but it is not intended that the technology disclosed herein is limited to these test examples.

[0125] <Preparation of gas absorbers> (Example 1) First, 135 g of porous silica particles (SiO2, average particle size 9 μm) as gas-absorbing particles, 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 metal mesh was placed on a flat aluminum metal substrate so that it was in full contact with the entire surface. Then, the slurry for forming the gas absorber of Example 1 was applied to the metal mesh to a total thickness of 2 mm. After that, the slurry for forming the gas absorber was squeezed from the metal substrate and the metal mesh at a speed of 200 mm / min using a squeegee. This obtained a sheet-like molded body. The sheet-like molded body was immersed in water for 24 hours. Then, the molded body after immersion in water was dried at 80°C for 5 hours to obtain a precursor of the gas absorber according to Example 1, which consisted of a flat sheet-like resin matrix and a mesh member embedded approximately at the center of the thickness direction of the resin matrix. For the mesh member used in Example 1, a plain weave metal mesh with the following configuration was used. Material: SUS304 Mesh count: 60 Wire diameter: 0.14mm Mesh opening: 0.283mm Space ratio: 44.4%

[0126] (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 metal mesh was placed on the squeezed slurry to obtain a molded body. Except for this, the procedure was the same as in Example 1. In this way, a precursor of the gas absorber according to Example 2 was obtained, which consisted of a resin matrix formed in a flat sheet shape and a mesh member placed on one surface of the resin matrix.

[0127] (Example 3) In Example 3, a metal substrate with slits was used instead of the metal substrate in Example 1. A gas absorber forming slurry similar to that in Example 1 was applied to the metal mesh so that the total thickness was 2 mm (the thickness of the base portion was 1 mm and the height of the protrusions was 1 mm). Everything else was the same as in Example 1. This resulted in a precursor of the gas absorber according to Example 3, which had a base portion, a resin matrix with protrusions extending from one surface of the base portion and arranged in a direction perpendicular to the thickness direction of the base portion (hereinafter referred to as "striped"), and a mesh member embedded approximately at the center of the thickness direction of the resin matrix.

[0128] (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 a precursor for the gas absorber according to Example 4, which comprises a base portion, a resin matrix having protrusions extending from one surface of the base portion and arranged in a stripe pattern, and a mesh member arranged on the other surface of the base portion (the surface without the protrusions).

[0129] (Example 5) In Example 5, the procedure 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 the gas absorber according to Example 5, which comprises a base portion, a resin matrix having convex portions extending from one surface of the base portion and arranged in a staggered pattern, and a mesh member embedded approximately at the center of the thickness direction of the resin matrix.

[0130] (Example 6) In Example 6, the process was the same as in Example 2, except that the perforated metal according to Example 5 was used instead of the metal plate according to Example 2. This resulted in a precursor for the gas absorber according to Example 6, which comprises a base portion, a resin matrix having convex portions extending from one surface of the base portion and arranged in a staggered pattern, and a mesh member arranged on the other surface of the base portion (the surface without convex portions).

[0131] (Reference example) Here, gas absorber samples were prepared to evaluate the porosity of gas absorbers fabricated using the gas absorber-forming slurries of the test examples (Examples 1-6). Specifically, a gas absorber-forming slurry similar to that in Example 1 was prepared, and the slurry was applied to a glass substrate to a thickness of 2 mm on a flat aluminum metal substrate. No mesh material was used. This resulted in obtaining a reference example gas absorber formed in a sheet shape.

[0132] <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 W a+w The following measurements were taken. Then, the porosity (P) 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)

[0133] <Introduction of gas absorbent> (Examples 1-6) Here, gas absorbers were prepared by introducing an active substance to the gas absorber precursors prepared in Examples 1 to 6 above. Specifically, first, the gas absorber 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 absorber precursors were impregnated into the PEI solution in the thickness direction, and left to stand for 1 minute with the precursors completely submerged in the PEI solution. After that, the precursors were removed from the PEI solution and placed perpendicular to the thickness direction to remove any excess PEI solution adhering to the surface of the precursors. 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 obtaining gas absorbers containing gas absorbent particles in which the gas absorbent is arranged within the pores of the carrier particles.

[0134] <Fabrication of gas adsorption units> (Examples 1-6) Here, we fabricated gas adsorption units equipped with the gas absorbers described in Examples 1 to 6 above. First, we prepared a frame measuring 300 mm in width, 400 mm in depth, and 300 mm in height. 150 gas absorbers for each example were stacked on the frame. This completed the fabrication of the gas absorption units described in Examples 1 to 6.

[0135] <Measurement of pressure loss> Here, the pressure loss was measured for the gas absorption units described in 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 at the inlet and outlet sides of the gas absorption unit were then measured using pressure gauges, and the pressure loss (Pa) was calculated. The results are shown in Table 1.

[0136] [Table 1]

[0137] As shown in Table 1, 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 is presumed to be because the resin matrix has multiple protrusions extending from the surface of the base portion, which caused turbulence in the gas flow.

[0138] 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 illustrated above.

[0139] As described above, specific embodiments of the technology disclosed herein include those listed in the following items.

[0140] [Section 1] A gas absorber for absorbing specific gases to be recovered, A porous resin matrix, Gas-absorbing particles and, A sheet-like mesh member, It is equipped with, The above resin matrix has a three-dimensional network structure including pores, and comprises a flat base portion and a plurality of protrusions extending from the surface of the base portion. The above-mentioned sheet-like mesh member is arranged along the base portion of the resin matrix, with at least a portion of it embedded in the resin matrix. The above gas-absorbing particles are arranged within the pores of the above resin matrix. Gas absorber.

[0141] [Section 2] The multiple protrusions described above are spaced apart from each other and are arranged to extend in a direction perpendicular to the thickness direction of the base portion. The gas absorber described in item 1.

[0142] [Section 3] The above-mentioned multiple protrusions are arranged in a staggered pattern. The gas absorber described in item 1.

[0143] [Section 4] The above mesh member is arranged embedded in the base portion of the above resin matrix. A gas absorber as described in any one of items 1 to 3.

[0144] [Section 5] The above gas-absorbing particles are porous particles having multiple mesopores. The average pore size A of the above resin matrix is ​​0.4 μm or more and 7 μm or less. The average pore size B of the above gas-absorbing particles is between 2 nm and 100 nm. A gas absorber as described in any one of items 1 to 4.

[0145] [Section 6] The ratio (A / B) of the average pore diameter A of the resin matrix to the average pore diameter B of the gas-absorbing particles is 20 or more and 200 or less. The gas absorber described in item 5.

[0146] [Section 7] The porosity, based on the Archimedes method, is between 70% and 90%. A gas absorber as described in any one of items 1 to 6.

[0147] [Section 8] The water absorption rate based on the Archimedes method is between 150% and 350%. A gas absorber as described in any one of items 1 to 7.

[0148] [Section 9] It has a heat resistance of 120°C to 250°C. A gas absorber as described in any one of items 1 to 8.

[0149] [Section 10] The above resin matrix includes a resin having a glass transition temperature of 70°C to 250°C. A gas absorber as described in any one of items 1 to 9.

[0150] [Section 11] The above gas-absorbing particles comprise a carrier particle having a plurality of mesopores and a gas absorbent. The above gas absorbent is placed in a plurality of mesopores of the above carrier particles. A gas absorber as described in any one of items 1 to 10.

[0151] [Section 12] The above-mentioned mesh member made of metal is provided. A gas absorber as described in any one of items 1 to 11.

[0152] [Section 13] The average height of the above-mentioned multiple protrusions is H ave In that case, at least 80% of the above-mentioned multiple protrusions are 0.5H ave ~1.5H ave Having a height A gas absorber as described in any one of items 1 to 12.

[0153] [Section 14] The above-mentioned multiple protrusions have a flat surface at the tip in the direction of protrusion. A gas absorber as described in any one of items 1 to 13.

[0154] [Section 15] In the above resin matrix, the total area of ​​the flat surfaces is at least 30% of the area of ​​the surfaces on which the multiple protrusions are provided. The gas absorber described in item 14. [Explanation of Symbols]

[0155] 10, 110 Gas absorber 20, 120 resin matrix 20b, 120b Base section 20p, 120p convex part 22 pores 30, 130 gas-absorbing particles 32 pores 40, 140 mesh members 132 Carrier particles 133 pores 134 Gas absorbent 500 Gas Absorption Units 510 Frame 510h aperture

Claims

1. A gas absorber for absorbing specific gases to be recovered, A porous resin matrix, Gas-absorbing particles and, A sheet-like mesh member, It is equipped with, The resin matrix has a three-dimensional network structure including pores, and comprises a flat base portion and a plurality of protrusions extending from the surface of the base portion. The sheet-like mesh member is arranged along the base portion of the resin matrix with at least a portion of it embedded in the resin matrix. The gas-absorbing particles are arranged within the pores of the resin matrix. Gas absorber.

2. The plurality of protrusions are spaced apart from each other and are arranged to extend in a direction perpendicular to the thickness direction of the base portion. The gas absorber according to claim 1.

3. The aforementioned multiple protrusions are arranged in a staggered pattern. The gas absorber according to claim 1.

4. The mesh member is arranged embedded in the base portion of the resin matrix. A gas absorber according to any one of claims 1 to 3.

5. The aforementioned gas-absorbing particles are porous particles having multiple mesopores, The average pore size A of the resin matrix is ​​0.4 μm or more and 7 μm or less. The average pore size B of the gas-absorbing particles is 2 nm or more and 100 nm or less. A gas absorber according to any one of claims 1 to 3.

6. The ratio (A / B) of the average pore diameter A of the resin matrix to the average pore diameter B of the gas-absorbing particles is 20 or more and 200 or less. The gas absorber according to claim 5.

7. The porosity, based on the Archimedes method, is between 70% and 90%. A gas absorber according to any one of claims 1 to 3.

8. The water absorption rate based on the Archimedes method is between 150% and 350%. A gas absorber according to any one of claims 1 to 3.

9. It has a heat resistance of 120°C to 250°C. A gas absorber according to any one of claims 1 to 3.

10. The resin matrix comprises a resin having a glass transition temperature of 70°C or higher and 250°C or lower. A gas absorber according to any one of claims 1 to 3.

11. The gas-absorbing particles comprise a carrier particle having a plurality of mesopores and a gas absorbent. The gas absorbent is arranged in a plurality of mesopores of the carrier particles. A gas absorber according to any one of claims 1 to 3.

12. The mesh member is made of metal, A gas absorber according to any one of claims 1 to 3.

13. The average height of the plurality of protrusions is H ａｖｅ In that case, at least 80% of the multiple protrusions are 0.5H ａｖｅ ~1.5H ａｖｅ Having a height A gas absorber according to any one of claims 1 to 3.

14. The aforementioned multiple protrusions have a flat surface at the tip in the direction of protrusion. A gas absorber according to any one of claims 1 to 3.

15. In the resin matrix, the total area of ​​the flat surfaces is at least 30% of the area of ​​the surfaces on which the plurality of protrusions are provided. The gas absorber according to claim 14.

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