suction device

Abstract

The present invention provides an adsorption device suitable for reducing pressure loss when gas is introduced while maintaining the amount of adsorption sheet that can be mounted. [Solution] The adsorption device 100 of the present invention comprises a first adsorption sheet 1a and a second adsorption sheet 1b. The first adsorption sheet 1a and the second adsorption sheet 1b are aligned in the thickness direction of the first adsorption sheet 1a. The thickness of each of the first adsorption sheet 1a and the second adsorption sheet 1b is 270 μm or more. The distance between the first adsorption sheet 1a and the second adsorption sheet 1b is 520 μm or more.

Description

[Technical Field]

[0001] This invention relates to an adsorption device. [Background technology]

[0002] In recent years, carbon capture and storage (CCS) and carbon capture and utilization (CCU) have been considered as ways to reduce the amount of carbon dioxide in the atmosphere. In CCS and CCU, carbon dioxide is sometimes captured by separating it from the atmosphere.

[0003] Adsorption methods have been developed to separate acidic gases such as carbon dioxide from the atmosphere by adsorbing them onto an adsorbent. Adsorbents used in adsorption methods can adsorb acidic gases, for example, by coming into contact with the atmosphere. Patent Document 1 shows an example of an adsorbent. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Special Publication No. 2017-528318 [Overview of the project] [Problems that the invention aims to solve]

[0005] For adsorption devices equipped with adsorption sheets containing adsorbent material, there is a need to reduce pressure loss when introducing gases such as acidic gases, while maintaining the amount of adsorption sheet installed. [Means for solving the problem]

[0006] The present invention Equipped with a first suction sheet and a second suction sheet, The first adsorption sheet and the second adsorption sheet are arranged in the thickness direction of the first adsorption sheet. The thickness of each of the first adsorption sheet and the second adsorption sheet is 270 μm or more, Provided is an adsorption device, wherein the distance between the first adsorption sheet and the second adsorption sheet is 520 μm or more. Effects of the Invention

[0007] According to the present invention, it is possible to provide an adsorption device suitable for reducing pressure loss when a gas is introduced while maintaining the mounted amount of the adsorption sheet. Brief Description of the Drawings

[0008] [Figure 1] It is a perspective view schematically showing an adsorption device according to one embodiment of the present invention. [Figure 2] It is a cross-sectional view schematically showing an adsorption device according to one embodiment of the present invention. [Figure 3] It is a plan view schematically showing an example of the arrangement of a plurality of spacers A on the second adsorption sheet. Modes for Carrying Out the Invention

[0009] An adsorption device according to a first aspect of the present invention is comprising a first adsorption sheet and a second adsorption sheet, wherein the first adsorption sheet and the second adsorption sheet are arranged side by side in the thickness direction of the first adsorption sheet, the thickness of each of the first adsorption sheet and the second adsorption sheet is 270 μm or more, and the distance between the first adsorption sheet and the second adsorption sheet is 520 μm or more.

[0010] In a second aspect of the present invention, for example, the adsorption device according to the first aspect further comprises a spacer A disposed between the first adsorption sheet and the second adsorption sheet.

[0011] In the third aspect of the present invention, for example, in the adsorption device according to the second aspect, the spacer A is in contact with each of the main surface of the first adsorption sheet and the main surface of the second adsorption sheet.

[0012] In the fourth aspect of the present invention, for example, the adsorption device according to the second or third aspect comprises a plurality of the spacers A, the plurality of the spacers A are arranged in a matrix.

[0013] In the fifth aspect of the present invention, for example, the adsorption device according to any one of the second to fourth aspects further comprises a third adsorption sheet and a spacer B, the first adsorption sheet, the second adsorption sheet, and the third adsorption sheet are arranged in this order in the thickness direction, the spacer B is disposed between the second adsorption sheet and the third adsorption sheet, and overlaps the spacer A in a plan view.

[0014] In the sixth aspect of the present invention, for example, the adsorption device according to any one of the first to fifth aspects further comprises an accommodating portion that accommodates the first adsorption sheet and the second adsorption sheet.

[0015] In the seventh aspect of the present invention, for example, in the adsorption device according to the sixth aspect, the accommodating portion applies a load that compresses the first adsorption sheet in the thickness direction to the first adsorption sheet.

[0016] In the eighth aspect of the present invention, for example, in the adsorption device according to the sixth or seventh aspect, the first adsorption sheet is detachable from the accommodating portion.

[0017] In the ninth aspect of the present invention, for example, in the adsorption device according to any one of the first to eighth aspects, the space between the first adsorption sheet and the second adsorption sheet is a ventilation path.

[0018] In the tenth embodiment of the present invention, for example, in the adsorption apparatus according to the ninth embodiment, during the adsorption operation in which gas G is adsorbed onto the first adsorption sheet, the gas G passes through the ventilation path, During the desorption operation, in which the gas G adsorbed by the first adsorption sheet is detached from the first adsorption sheet, a gaseous heat transfer medium passes through the ventilation path.

[0019] In the 11th aspect of the present invention, for example, in the adsorption apparatus according to the 10th aspect, the gas G is an acidic gas.

[0020] In a twelfth embodiment of the present invention, for example, in an adsorption device according to any one of the first to eleventh embodiments, the first adsorption sheet and the second adsorption sheet are each in the shape of a flat plate.

[0021] In a thirteenth aspect of the present invention, for example, in an adsorption device according to any one of the first to twelfth aspects, the first adsorption sheet comprises a polymer having an amino group.

[0022] In the 14th aspect of the present invention, for example, in the adsorption device according to the 13th aspect, the polymer has constituent units derived from an epoxy compound and constituent units derived from an amine compound.

[0023] In a 15th aspect of the present invention, for example, in an adsorption device according to the 13th or 14th aspect, the first adsorption sheet has a three-dimensional network structure containing the polymer.

[0024] The details of the present invention will be described below, but the following description is not intended to limit the present invention to any particular embodiment.

[0025] <Embodiment of an adsorption device> As shown in Figures 1 and 2, the adsorption device 100 of this embodiment comprises a first adsorption sheet 1a and a second adsorption sheet 1b. The first adsorption sheet 1a and the second adsorption sheet 1b are aligned in the thickness direction of the first adsorption sheet 1a. In this embodiment, the respective thicknesses Ta and Tb of the first adsorption sheet 1a and the second adsorption sheet 1b are 270 μm or more. Furthermore, the distance L between the first adsorption sheet 1a and the second adsorption sheet 1b is 520 μm or more. In this specification, the adsorption sheets such as the first adsorption sheet 1a and the second adsorption sheet 1b may be simply referred to as "adsorption sheet 1". Adsorption sheet 1 is typically a sheet capable of adsorbing gas G (particularly acidic gas), which will be described later. The thickness of adsorption sheet 1 refers to the thickness when it is installed in the adsorption device 100 (more specifically, when it is housed in the housing section 20, which will be described later).

[0026] In this specification, the direction perpendicular to the thickness direction of the first adsorption sheet 1a is defined as "direction X," the direction perpendicular to direction X and in which the gas moves through the ventilation path 10 described later when the gas is introduced is defined as "direction Y," and the thickness direction of the first adsorption sheet 1a is defined as "direction Z."

[0027] In the adsorption device 100, the first adsorption sheet 1a and the second adsorption sheet 1b are aligned in direction Z. The main surface of the first adsorption sheet 1a faces the main surface of the second adsorption sheet 1b, separated by a space (gap). The space between the first adsorption sheet 1a and the second adsorption sheet 1b can function as a ventilation path 10. Note that "main surface" refers to the surface of the adsorption sheet 1 that has the largest surface area.

[0028] As described above, in the adsorption device 100, the thicknesses Ta and Tb of the first adsorption sheet 1a and the second adsorption sheet 1b are adjusted to 270 μm or more. The thicknesses Ta and Tb may be 300 μm or more, 350 μm or more, 400 μm or more, and even 450 μm or more. The upper limit of the thicknesses Ta and Tb is, for example, 2000 μm or less, and may be 1500 μm or less, 1000 μm or less, 800 μm or less, 700 μm or less, and even 600 μm or less. The thickness Ta of the first adsorption sheet 1a may be the same as the thickness Tb of the second adsorption sheet 1b, or it may be different.

[0029] As described above, in the adsorption device 100, the distance L between the first adsorption sheet 1a and the second adsorption sheet 1b is adjusted to 520 μm or more. The distance L may be 550 μm or more, 600 μm or more, 700 μm or more, 800 μm or more, and even 900 μm or more. The upper limit of the distance L is, for example, 3000 μm or less, and may be 2000 μm or less, 1500 μm or less, and even 1300 μm or less.

[0030] In the adsorption device 100 of this embodiment, by adjusting the thicknesses Ta and Tb of the first adsorption sheet 1a and the second adsorption sheet 1b, respectively, and the distance L between the first adsorption sheet 1a and the second adsorption sheet 1b to the above range, it is possible to reduce the pressure loss when a gas such as an acidic gas passes through the ventilation path 10 while maintaining the amount of adsorption sheets 1a and 1b that can be mounted.

[0031] Each of the first adsorption sheet 1a and the second adsorption sheet 1b is typically flat. That is, it is preferable that these adsorption sheets 1 are not subjected to any shaping processes such as corrugation. The first adsorption sheet 1a and the second adsorption sheet 1b may be the same in shape, dimensions, composition, etc.

[0032] The adsorption device 100 preferably further comprises a spacer A disposed between the first adsorption sheet 1a and the second adsorption sheet 1b. The spacer A is a member for securing a space as a ventilation path 10 between the first adsorption sheet 1a and the second adsorption sheet 1b. Typically, the spacer A is in contact with the main surface of the first adsorption sheet 1a and the main surface of the second adsorption sheet 1b, respectively. In other words, the spacer A does not penetrate the first adsorption sheet 1a or the second adsorption sheet 1b in direction Z. It is preferable that the spacer A is in direct contact with the first adsorption sheet 1a and the second adsorption sheet 1b without the use of adhesives or other adhesives. This embodiment has the advantage that deterioration of adhesives or adhesives is not a problem. However, the spacer A may be bonded to the first adsorption sheet 1a and the second adsorption sheet 1b via adhesives or adhesives.

[0033] The shape of spacer A is not particularly limited. For example, the shape of spacer A is columnar (cylindrical, elliptical, prismatic, etc.) extending in direction Z, and is preferably cylindrical. When spacer A is cylindrical, the diameter of spacer A in plan view is not particularly limited and can be adjusted as appropriate according to the size of the suction sheet 1, etc. The diameter of spacer A in plan view is, for example, 0.1 mm to 100 mm, or 0.1 mm to 10 mm. The length (thickness) of spacer A in direction Z refers to the length (thickness) when it is installed in the suction device 100 (more specifically, when it is housed in the housing section 20 described later), and typically coincides with the distance L between the first suction sheet 1a and the second suction sheet 1b.

[0034] The shape of spacer A is not limited to a columnar shape. In some cases, spacer A may be block-shaped extending in direction Y.

[0035] The material of spacer A is not particularly limited and may be made of metal or resin. Spacer A may also contain a material that can adsorb gas G (especially acidic gases) as described later.

[0036] The adsorption device 100 preferably includes a plurality of spacers A. The number of spacers A is not particularly limited, and is, for example, 2 to 1000. In particular, if each of the spacers A is columnar, the number of spacers A is preferably 10 or more, and may be 100 or more.

[0037] Figure 3 is a schematic plan view showing an example of an arrangement of multiple spacers A on the second suction sheet 1b. As shown in Figure 3, the multiple spacers A may be arranged in a matrix in directions X and Y. In this specification, "matrix" includes grid and staggered arrangements. In the example in Figure 3, multiple cylindrical spacers A are arranged in a staggered pattern in directions X and Y.

[0038] Among the multiple spacers A arranged in a matrix, the distance Lx between two adjacent spacers A in direction X and the distance Ly between two adjacent spacers A in direction Y are not particularly limited and can be adjusted as appropriate according to the size of the suction sheet 1 and spacers A. The distance Lx between two adjacent spacers A in direction X may be, for example, 1 mm to 1000 mm, or 1 mm to 100 mm. The distance Ly between two adjacent spacers A in direction Y may be, for example, 1 mm to 1000 mm, or 1 mm to 100 mm.

[0039] The adsorption device 100 may further include a third adsorption sheet 1c and a spacer B. In the adsorption device 100, the first adsorption sheet 1a, the second adsorption sheet 1b, and the third adsorption sheet 1c are arranged in this order in the thickness direction of the first adsorption sheet 1a (more specifically, in the opposite direction to direction Z in Figure 1). The main surface of the third adsorption sheet 1c faces the main surface of the second adsorption sheet 1b through a space (gap). The space between the third adsorption sheet 1c and the second adsorption sheet 1b can function as a ventilation path 10.

[0040] The third adsorption sheet 1c is typically flat. The thickness of the third adsorption sheet 1c is preferably adjusted to 270 μm or more. The thickness of the third adsorption sheet 1c may be within the ranges described above for thicknesses Ta and Tb. The first adsorption sheet 1a, the second adsorption sheet 1b, and the third adsorption sheet 1c may be the same in shape, dimensions, composition, etc. The distance between the third adsorption sheet 1c and the second adsorption sheet 1b is preferably adjusted to 520 μm or more. This distance may be within the range described above for distance L.

[0041] Spacer B is positioned between the second adsorption sheet 1b and the third adsorption sheet 1c. Spacer B is a component that secures space between the second adsorption sheet 1b and the third adsorption sheet 1c as a ventilation path 10. Typically, spacer B is in contact with the main surface of the second adsorption sheet 1b and the main surface of the third adsorption sheet 1c. The shape, dimensions, material, etc. of spacer B are as described above for spacer A.

[0042] In this embodiment, it is preferable that spacer B overlaps spacer A in a plan view. In other words, it is preferable that spacers A and B are aligned in direction Z. In this case, even if a load is applied to the second suction sheet 1b located between spacers A and B that compresses the second suction sheet 1b in the thickness direction, the second suction sheet 1b tends to be less susceptible to damage such as bending. As an example, when the second suction sheet 1b is observed in direction Z (observed in a plan view), the area of ​​the region where spacer B exists (mm²) 2 The area (mm²) of the region where spacers A and B overlap ) 2 The ratio of ) may be, for example, 50% or more, and may be 80% or more, or even 90% or more. This ratio may also be 100%. That is, the entirety of spacer A may overlap spacer B in a plan view.

[0043] The adsorption device 100 preferably includes a plurality of spacers B. The number and arrangement of the plurality of spacers B are as described above for spacer A. When the adsorption device 100 includes a plurality of spacers A and a plurality of spacers B, it is preferable that each of the plurality of spacers B overlaps the plurality of spacers A in a plan view.

[0044] The adsorption device 100 may further include other adsorption sheets 1 besides the first to third adsorption sheets 1a to 1c, and other spacers besides spacers A and B. The number of adsorption sheets 1 included in the adsorption device 100 is not particularly limited and may be, for example, 2 to 100, or 5 to 50. In the examples of Figures 1 and 2, the adsorption device 100 includes the first to eighth adsorption sheets 1a to 1h. In the adsorption device 100, the multiple adsorption sheets 1 are arranged in direction Z. Between two adjacent adsorption sheets 1, a space is formed that can function as a ventilation path 10.

[0045] In the adsorption device 100, it is preferable that the thickness of each of the multiple adsorption sheets 1 is adjusted to 270 μm or more. The thicknesses of the multiple adsorption sheets 1 may be within the ranges described above for thicknesses Ta and Tb. The multiple adsorption sheets 1 may be the same in shape, dimensions, composition, etc.

[0046] Furthermore, in the adsorption device 100, it is preferable that the distance between two adjacent adsorption sheets 1 is adjusted to 520 μm or more. This distance may be within the range described above for distance L. Note that the distance between two adjacent adsorption sheets 1 may be the same in all of the multiple adsorption sheets 1. That is, the multiple adsorption sheets 1 may be arranged at equal intervals in the direction Z.

[0047] It is preferable that the spacers are placed between two adjacent adsorption sheets 1 among the multiple adsorption sheets 1. In the examples shown in Figures 1 and 2, the adsorption device 100 is equipped with spacers A to G. More specifically, in the adsorption device 100, the first to eighth adsorption sheets 1a to 1h and spacers A to G are arranged alternately in direction Z. The shape, dimensions, material, number, arrangement, etc. of each spacer are as described above for spacers A and B.

[0048] The adsorption device 100 preferably further comprises a housing section 20 for housing the first adsorption sheet 1a and the second adsorption sheet 1b. The housing section 20 has, for example, a pair of plate members 21a and 21b and a pair of side plates 23a and 23b. All adsorption sheets 1 and spacers provided in the adsorption device 100 are surrounded by these plate members 21a and 21b and the side plates 23a and 23b.

[0049] In the housing section 20, a pair of plate members 21a and 21b are arranged in direction Z, and a pair of side plates 23a and 23b are arranged in direction X. The pair of side plates 23a and 23b are positioned to sandwich the pair of plate members 21a and 21b. The housing section 20 is configured so as not to block the ventilation path 10. In detail, the housing section 20 is configured such that the inlet and outlet of the ventilation path 10, which is arranged in direction Y, communicate with the external space of the adsorption device 100. The material of the components of the housing section 20 is not particularly limited and may be made of metal or resin.

[0050] In the examples shown in Figures 1 and 2, the plate member 21a is located above the first adsorption sheet 1a and is adjacent to the first adsorption sheet 1a. The distance between the plate member 21a and the first adsorption sheet 1a is preferably adjusted to 520 μm or more. This distance may be within the range described above for distance L.

[0051] The adsorption device 100 may further include a spacer 5a positioned between the plate member 21a and the first adsorption sheet 1a. The spacer 5a may ensure a space between the plate member 21a and the first adsorption sheet 1a that serves as a ventilation path 10. Typically, the spacer 5a is in contact with the main surface of the plate member 21a and the main surface of the first adsorption sheet 1a, respectively. The shape, dimensions, material, number, arrangement, etc. of the spacer 5a are as described above for spacers A and B.

[0052] Similarly, in the examples of Figures 1 and 2, the plate member 21b is located below the eighth adsorption sheet 1h and is adjacent to the eighth adsorption sheet 1h. The distance between the plate member 21b and the eighth adsorption sheet 1h is preferably adjusted to 520 μm or more. This distance may be within the range described above for distance L.

[0053] The adsorption device 100 may further include a spacer 5b positioned between the plate member 21b and the eighth adsorption sheet 1h. The spacer 5b may ensure a space between the plate member 21b and the eighth adsorption sheet 1h that serves as a ventilation path 10. Typically, the spacer 5b is in contact with the main surface of the plate member 21b and the main surface of the eighth adsorption sheet 1h, respectively. The shape, dimensions, material, number, arrangement, etc. of the spacer 5b are as described above for spacers A and B.

[0054] The housing section 20 may be configured to apply a load (compressive load) to the first suction sheet 1a in the thickness direction, compressing the first suction sheet 1a. More specifically, it is preferable that a pair of plate members 21a and 21b of the housing section 20 are configured to apply the above-mentioned compressive load to all the suction sheets 1 within the housing section 20 via spacers. The housing section 20 may further include restraining members (such as cable ties) and fastening members (such as screws, bolts, and clamps) for applying the above-mentioned compressive load. Note that the thickness of the suction sheets 1 and spacers may be slightly reduced when the compressive load is applied.

[0055] In a preferred example, the plate member 21b is connected and fixed to a pair of side plates 23a and 23b. In this example, the above-mentioned compressive load can be applied to the suction sheet 1 by pushing the plate member 21a in the thickness direction of the suction sheet 1 (specifically, in the opposite direction to direction Z in Figure 1). In this example, the position of the spacers within the housing 20 is less likely to shift, and the spacers tend to be positioned with high precision.

[0056] In another preferred example, both plate members 21a and 21b are connected and fixed to a pair of side plates 23a and 23b. In this example, the suction sheet 1 and the spacer are laminated, and the above-mentioned compressive load can be applied to the suction sheet 1 by pressing the laminate, which has a thickness slightly greater than the length in the direction Z of the internal space of the housing 20, into the internal space of the housing 20.

[0057] Furthermore, it is preferable that the suction sheet 1 and spacers of the suction device 100 are detachable from the housing section 20. In this specification, "detachable" means that the suction sheet 1 and spacers can be attached to and removed without damaging the housing section 20. When the suction sheet 1 and spacers are detachable from the housing section 20, the suction sheet 1 and spacers can be easily replaced. The removed suction sheet 1 and spacers may be subjected to separate maintenance. For example, a deteriorated suction sheet 1 may be subjected to a regeneration process.

[0058] [Adhesive sheet] The following section provides a detailed description of the adsorption sheets 1, including the first adsorption sheet 1a.

[0059] Adsorption sheet 1 is a sheet containing an adsorbent. Preferably, this adsorbent is suitable for the Thermal Swing Adsorption (TSA) method.

[0060] Adsorption sheet 1 preferably contains a polymer P having amino groups as an adsorbent. Polymer P is suitable for applications that adsorb acidic gases. However, the adsorbent contained in adsorption sheet 1 is not limited to polymer P. The adsorbent may be other amine compounds other than polymer P, or inorganic materials, etc.

[0061] Polymer P has an amino group, as described above. Preferably, polymer P has a constituent unit U1 derived from an epoxy compound and a constituent unit U2 derived from an amine compound. Polymer P includes, for example, a reactant P1 from a group of compounds including an amine compound and an epoxy compound. The reactant P1 may be a polymer of the epoxy compound and the amine compound, or it may be a crosslinked product in which the amine compound is crosslinked by the epoxy compound.

[0062] Examples of amine compounds include ethylamine, ethylenediamine, 1,4-butylenediamine, 1,5-pentanediamine, 1,6-hexanediamine, 1,7-heptanediamine, 1,8-octanediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, hexaethyleneheptamine, iminobispropylamine, bis(hexamethylene)triamine, 1,3,6-trisaminomethylhexane, tris(2-aminoethyl)amine, N,N'-bis(3-aminopropyl)ethylenediamine, polymethylenediamine, trimethylhexamethylenediamine, polyetherdiamine, and other lipids. Aliphatic amines; alicyclic amines such as isophorone diamine, menthanediamine, piperazine, N-aminoethylpiperazine, 3,9-bis(3-aminopropyl)2,4,8,10-tetraoxaspiro(5,5)undecane adduct, bis(4-amino-3-methylcyclohexyl)methane, bis(4-aminocyclohexyl)methane, and modified versions thereof; aliphatic polyamines such as polyethyleneimine, polypropyleneimine, polyallylamine, and polyalkylene polyamine; (meth)acrylic polymers having amino groups such as aminoethylated acrylic polymers; and aliphatic polyamidoamines formed by the reaction of polyamines with dimer acids. Amine compounds can be used alone or in combination of two or more.

[0063] Examples of epoxy compounds include monofunctional epoxy compounds such as n-butyl glycidyl ether, higher alcohol glycidyl ether, allyl glycidyl ether, 2-ethylhexyl glycidyl ether, phenyl glycidyl ether, cresyl glycidyl ether, p-sec-butylphenyl glycidyl ether, and t-butylphenyl glycidyl ether; diepoxyalkanes such as 1,5-hexadiene diepoxide, 1,7-octadiene diepoxide, and 1,9-decadiene diepoxide; and (poly)ethylene glycol diglycidyl ether. Examples include polyfunctional epoxy compounds having an ether group, such as ether, (poly)propylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether, neopentyl glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, trimethylolpropane polyglycidyl ether, and sorbitol polyglycidyl ether; and polyfunctional epoxy compounds having an amino group, such as N,N,N',N'-tetraglycidylmetoxylendiamine and 1,3-bis(N,N-diglycidylaminomethyl)cyclohexane.

[0064] The epoxy compound may, in some cases, be an aromatic epoxy resin, a non-aromatic epoxy resin, etc. Examples of aromatic epoxy resins include polyphenyl-based epoxy resins, epoxy resins containing fluorene rings, epoxy resins containing triglycidyl isocyanurate, and epoxy resins containing heteroaromatic rings (e.g., triazine rings). Examples of polyphenyl-based epoxy resins include bisphenol A type epoxy resins, brominated bisphenol A type epoxy resins, bisphenol F type epoxy resins, bisphenol AD ​​type epoxy resins, stilbene type epoxy resins, biphenyl type epoxy resins, bisphenol A novolac type epoxy resins, cresol novolac type epoxy resins, diaminodiphenylmethane type epoxy resins, and tetrakis(hydroxyphenyl)ethane-based epoxy resins. Examples of non-aromatic epoxy resins include aliphatic glycidyl ether type epoxy resins, aliphatic glycidyl ester type epoxy resins, alicyclic glycidyl ether type epoxy resins, alicyclic glycidylamine type epoxy resins, and alicyclic glycidyl ester type epoxy resins.

[0065] Epoxy compounds can be used individually or in combination of two or more. When using monofunctional epoxy compounds, it is preferable to use them in combination with other epoxy compounds containing two or more epoxy groups. Monofunctional epoxy compounds can also be used as reactive diluents to adjust the viscosity of the compounds used to form the reactants.

[0066] The content of constituent unit U1 in polymer P, particularly reactant P1, is, for example, 20 wt% to 70 wt%. The content of constituent unit U2 in polymer P, particularly reactant P1, is, for example, 30 wt% or more, preferably 50 wt% or more. The upper limit of the content of constituent unit U2 is not particularly limited, but is, for example, 80 wt%.

[0067] Polymer P is not limited to those described above, as long as it contains an amino group. Other examples of polymer P include aromatic ring-containing polymers such as polystyrene and polyvinylbenzene; polyolefins such as polyethylene and polypropylene; polyamides; polyurethanes; (meth)acrylate polymers such as polymethyl methacrylate (PMMA); and polymers to which an amino group has been introduced. Polymer P may also be a combination of these. Polymer P is preferably a polystyrene / polyvinylbenzene system containing an amino group.

[0068] When polymer P has constituent units U1 derived from an epoxy compound and constituent units U2 derived from an amine compound, the glass transition temperature Tg of polymer P is not particularly limited, and is, for example, 40°C or lower, preferably 30°C or lower, more preferably 20°C or lower, even more preferably 15°C or lower, and may be 10°C or lower, 5°C or lower, or 0°C or lower. When the glass transition temperature Tg of polymer P is this low, the rate of adsorption of acidic gases in the adsorption sheet 1 tends to be high. The lower limit of the glass transition temperature Tg of polymer P is, for example, -100°C, preferably -50°C, and more preferably -10°C, from the viewpoint of ensuring sufficient adsorption of acidic gases in the adsorption sheet 1 and heat resistance. In this specification, the glass transition temperature Tg is the intermediate glass transition temperature (T) determined in accordance with the provisions of JIS K7121:1987. mg This means that polymer P is a solid. Polymer P is typically a thermosetting resin. Polymer P is solid at, for example, 25°C, preferably in the range of 25°C to 80°C.

[0069] The weight-average molecular weight of polymer P is not particularly limited, but is, for example, 500 or more, preferably 1000 or more, more preferably 100000 or more, and even more preferably 100000 or more. The upper limit of the weight-average molecular weight of polymer P is, for example, 10000000 or less.

[0070] The polymer P content in the adsorption sheet 1 is, for example, 5 wt% or more, and may be 10 wt% or more, 15 wt% or more, 20 wt% or more, 25 wt% or more, 30 wt% or more, or even 35 wt% or more. The higher the polymer P content, the greater the amount of acidic gas adsorbed by the adsorption sheet 1 tends to be. The upper limit of the polymer P content is, for example, 80 wt% or less, and may be 60 wt% or less.

[0071] The polymer P content can be measured, for example, by the following method. First, the adsorption sheet 1 is placed in a simultaneous thermal analysis DSC / TGA instrument. At this time, the temperature is set to 30°C. Next, using this instrument, the temperature is raised from 30°C to 100°C at a heating rate of 10°C / min under a nitrogen atmosphere and held at that temperature for 40 minutes (Operation 1). According to Operation 1, water contained in the adsorption sheet 1 can be removed. Next, the temperature is raised from 100°C to 800°C at a heating rate of 10°C / min and held at that temperature for 5 minutes (Operation 2). According to Operation 2, polymer P can be removed from the adsorption sheet 1. The ratio of the difference between the weight W1(g) of the adsorption sheet 1 immediately after Operation 1 and the weight W2(g) of the adsorption sheet 1 immediately after Operation 2 (100 × (W1-W2) / W1) can be considered as the polymer P content in the adsorption sheet 1.

[0072] Adsorption sheet 1 may contain other components in addition to polymer P. Examples of other components include carriers for supporting polymer P, reaction accelerators, plasticizers, pigments, dyes, antioxidants, conductive materials, antistatic agents, UV absorbers, flame retardants, and antioxidants. Reaction accelerators are used, for example, when synthesizing polymer P. Examples of reaction accelerators include tertiary amines such as triethylamine and tributylamine; and imidazoles such as 2-phenol-4-methylimidazole, 2-ethyl-4-methylimidazole, and 2-phenol-4,5-dihydroxyimidazole. These reaction accelerators can accelerate reactions for synthesizing polymer P. Examples of carriers include fibers and fiber structures containing fibers. Examples of fibers include glass fibers; natural fibers such as wood pulp, cotton, and hemp (e.g., Manila hemp); and chemical fibers (synthetic fibers) such as polyester fibers, rayon, vinylon, acetate fibers, polyvinyl alcohol (PVA) fibers, polyamide fibers, polyolefin fibers, and polyurethane fibers. Examples of fiber structures include woven fabrics, nonwoven fabrics, and paper. A specific example of a fiber structure is glass paper.

[0073] The adsorption sheet 1 may have a porous structure. For example, the adsorption sheet 1 may be a porous body containing polymer P. Preferably, the porous body has a three-dimensional network skeleton containing polymer P. The three-dimensional network skeleton may further contain other components besides polymer P. As an example, in the porous body, the three-dimensional network skeleton extends continuously. Preferably, the pores contained in the porous body are continuous pores formed in a three-dimensional manner. The porous body may have independent pores or through pores penetrating the porous body.

[0074] The pores contained in the porous material (more specifically, pores derived from a three-dimensional network-like skeleton) are of an observable size when observed, for example, using a scanning electron microscope (SEM) at a magnification of 5000x. The average pore diameter is preferably 0.1 μm to 5 μm, and more preferably 3 μm or less. In some cases, the adsorption sheet 1 may be a non-porous material in which no pores can be observed using an SEM at a magnification of 5000x.

[0075] The density d of nitrogen elements in the adsorption sheet 1 is not particularly limited, but is, for example, 1 mmol / g or more, preferably 5 mmol / g or more, and more preferably 10 mmol / g or more. The upper limit of the density d is not particularly limited, but is, for example, 30 mmol / g. If all nitrogen elements contained in the adsorption sheet 1 originate from amino groups, the density d of nitrogen elements can be considered as the density of amino groups in the adsorption sheet 1.

[0076] The density d of the nitrogen element can be measured by the following method. First, the weight ratio w (wt%) of the nitrogen element contained in the adsorption sheet 1 is measured using a commercially available CHN elemental analyzer. Based on the obtained result, the density d of the nitrogen element can be calculated from the following formula. Density d (mmol / g) = (weight ratio w (wt%) × 1000) / (atomic weight of nitrogen × 100)

[0077] [Amount of adhesive sheet installed] In the adsorption device 100 of this embodiment, the weight of the adsorption sheet 1 per unit volume of the internal space of the housing section 20 is, for example, 80 g / m². 3 That is all, 130g / m 3 Furthermore, 180g / m 3 It may be greater than that. The above upper limit for weight is, for example, 1000g / m². 3 The following applies, and furthermore, 750g / m 3 The following is also acceptable.

[0078] Furthermore, when the adsorption sheet 1 contains the aforementioned polymer P, the molar amount of nitrogen element per unit volume of the internal space of the housing portion 20 is, for example, 100 mol / m 3 or more, and may be 500 mol / m 3 or more, and further 1000 mol / m 3 or more. The upper limit of the aforementioned molar amount is, for example, 5000 mol / m 3 or less, and may be 3000 mol / m 3 or less, and further 2000 mol / m 3 or less.

[0079] [Method for Operating Adsorption Apparatus] The adsorption apparatus 100 of the present embodiment repeatedly performs, for example, an adsorption operation in which the gas G is adsorbed onto the adsorption sheet 1, and a desorption operation in which the gas G adsorbed by the adsorption sheet 1 is desorbed from the adsorption sheet 1. By performing the adsorption operation and the desorption operation using the adsorption apparatus 100, the gas G can be recovered.

[0080] The gas G is typically an acidic gas. Examples of the acidic gas include carbon dioxide, hydrogen sulfide, carbonyl sulfide, sulfur oxides (SOx), hydrogen cyanide, nitrogen oxides (NOx), and the like, with carbon dioxide being preferred.

[0081] (Adsorption Operation) The adsorption operation is performed by, for example, the following method. First, the gas G is supplied into the adsorption apparatus 100. A mixed gas containing the gas G may be supplied into the adsorption apparatus 100. The mixed gas contains, for example, a gas other than the gas G (typically an acidic gas). Examples of the other gas include nonpolar gases such as hydrogen and nitrogen, and inert gases such as helium, with nitrogen being preferred. The mixed gas is typically the atmosphere. The mixed gas may be an off-gas from a chemical plant or thermal power generation.

[0082] The temperature of the mixed gas is, for example, room temperature (23°C). The concentration of gas G in the mixed gas is not particularly limited, and at standard conditions (0°C, 101kPa), it is, for example, 0.01 vol% (100 vol ppm) or more, preferably 0.04 vol% (400 vol ppm) or more, and may be 1.0 vol% or more. The upper limit of the concentration of gas G in the mixed gas is not particularly limited, and at standard conditions, it is, for example, 10 vol%. The pressure of the mixed gas is typically equal to atmospheric pressure in the operating environment of the adsorption device 100. However, the mixed gas supplied to the adsorption device 100 may be pressurized.

[0083] The gas G supplied into the adsorption device 100 passes, for example, through the ventilation path 10 in direction Y. As a result, the adsorption sheet 1 adsorbs the gas G. The adsorption operation is carried out, for example, until the adsorption of gas G by the adsorption sheet 1 reaches equilibrium.

[0084] (Detachment operation) Desorption is carried out, for example, by the following method. First, a gaseous heat transfer medium is supplied into the adsorption device 100. Examples of heat transfer mediums include water vapor. The temperature of the heat transfer medium is, for example, 50°C to 100°C.

[0085] The heat transfer medium supplied into the adsorption device 100 passes, for example, through the ventilation path 10 in direction Y. This heats the adsorption sheet 1, causing the gas G to desorb from the adsorption sheet 1. The desorption of gas G regenerates the adsorption sheet 1, allowing it to be used repeatedly. The gas G, particularly carbon dioxide, desorbed from the adsorption sheet 1 can be used as a raw material for chemical synthesis or as dry ice.

[0086] As described above, in the adsorption device 100, it is preferable that gas G passes through the ventilation path 10 during adsorption operation and that the gaseous heat transfer medium passes through the ventilation path 10 during desorption operation. [Examples]

[0087] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited thereto.

[0088] [Adhesive sheet] First, 1.50 g of poly(1,2-butanediol)-6 propylene glycol (NOF Co., Ltd., Uniol® PB-500) and 0.64 g of a copolymer of butylene glycol and propylene glycol (NOF Co., Ltd., Uniol® PB-700) were added to a 6 mL screw-cap vial (AS ONE Corporation). 1.28 g of ethylene glycol diglycidyl ether (Nagase ChemteX Corporation, EX-810) was dissolved in the resulting mixture to prepare a mixture of epoxy compounds and pologens.

[0089] Next, a mixture of epoxy compound, amine compound, and pologen was prepared by adding 1.70 g of polyethyleneimine (Epomin SP-012, manufactured by Nippon Shokubai Co., Ltd.) to this mixture. In this mixture, the ratio E / A of the equivalent amount of epoxy groups in the epoxy compound to the equivalent amount A of active hydrogen of the primary amino group in the amine compound was 0.5.

[0090] Next, a tabletop shaker (Angel Vibrator Digital 60Hz) was set to intensity 5 and the coating solution was shaken for 2 minutes. Then, using an applicator, this coating solution was applied onto 250 μm thick glass paper (PHN-50GC, manufactured by Oji F-Tex Co., Ltd.).

[0091] Next, the glass paper soaked in the coating solution was left to stand in a 120°C dryer for 30 minutes to cure the coating solution and obtain a cured body. This cured body was then immersed in ethyl acetate at 60°C for 30 minutes, and this process was repeated twice with a change of solution. This removed the pologen from the cured body, forming a sheet-like resin portion with a porous structure. Next, the material was dried in a 60°C dryer for 30 minutes to obtain an adsorbent sheet S (thickness 250 μm). The prepared adsorbent sheet S had a basis weight of 130 g / m². 2 The density d of the nitrogen element was 7.9 mmol / g. In the following examples and comparative examples, the data for the adsorption sheet S described above were referred to as necessary.

[0092] (Example 1) <Pressure loss simulation> Using a structure comprising a first adsorption sheet, a second adsorption sheet, and a spacer placed between the first and second adsorption sheets as an analytical model, the pressure loss when air passes between the first and second adsorption sheets was calculated by simulation.

[0093] [Analysis Model] In the analysis model, the length of the first and second adsorption sheets was set to 360 mm in direction X, 150 mm in direction Y, and 500 μm in length (thickness) in direction Z. Furthermore, 308 spacers were placed between the first and second adsorption sheets in a staggered pattern in directions X and Y (Figure 3). Each spacer was cylindrical with a thickness of 1000 μm and a diameter of 2.8 mm in plan view. Of the multiple spacers arranged in a staggered pattern, the distance Lx between two adjacent spacers A in direction X was set to 25.7 mm, and the distance Ly between two adjacent spacers A in direction Y was set to 13.4 mm.

[0094] In the analysis model, the distance L between the first adsorption sheet and the second adsorption sheet was equal to the thickness of the spacer (1000 μm). The analysis model included a preparatory section connected to the space (ventilation path) between the first and second adsorption sheets. Specifically, a first preparatory section connected to the inlet of the ventilation path and a second preparatory section connected to the outlet of the ventilation path were provided. In the analysis model, the length in direction X was set to 360 mm and the length in direction Y was set to 50 mm for each of the first and second preparatory sections.

[0095] [simulation] Using the analysis model described above, the pressure loss when air passes between the first and second adsorption sheets was calculated through simulation. The simulation software used was ANSYS Fluent 2023 R2 from ANSYS Corporation.

[0096] In the simulation, the wall conditions were set to have slip in the approach section and no slip in the ventilation path. The outlet of the analysis model was set to open to the atmosphere (0 Pa). The gas used in the simulation was air, and the flow rate was set so that its linear velocity was 4 m / s. The Realizable k-ε was used as the turbulence model.

[0097] The above simulation determined the average static pressure at the inlet and outlet of the analysis model, and the pressure loss was calculated using the following formula. As a result, the pressure loss in Example 1 was 0.7 kPa. Inlet average static pressure (kPa) - Outlet average static pressure (kPa) = Pressure loss (kPa)

[0098] <Amount of adhesive sheet to be installed> The amount of adsorption sheet used in the above analysis model that could be loaded onto the adsorption device was evaluated. In detail, it was first assumed that the adsorption sheet in the analysis model was the same as the adsorption sheet S described above, except for its thickness. That is, for the adsorption sheet in the analysis model (thickness 500 μm), the basis weight was 260 g / m². 2 It was assumed that the density d of nitrogen element is 7.9 mmol / g. These assumed values ​​were substituted into equations (1) and (2) below. In equation (1), the decimal part was truncated so that the number of adsorbent sheets per meter of length in the direction Z of the internal space was an integer. Using equations (1) and (2), the amount of nitrogen element per unit volume of the internal space of the containment section when the adsorbent sheets are mounted on the adsorption device was calculated. In Example 1, this amount of substance was 1363 mol / m 3 The above amount of substance can be used as an indicator of the amount of adsorption sheet to be loaded onto the adsorption device. (1) Weight of the adsorption sheet per unit volume of the internal space (g / m 3 ) =Gross weight (g / m 2 ) × Number of adsorption sheets per meter in the internal space direction Z ( / m) =Gross weight (g / m 2 ) × 1000 / (Spacer thickness (mm) + Adhesive sheet thickness (mm)) (2) Amount of nitrogen per unit volume of internal space (mol / m³) 3 ) = Density of nitrogen element d (mmol / g) × Weight of adsorption sheet per unit volume of internal space (g / m 3 ) / 1000

[0099] (Comparative Example 1) <Pressure loss simulation> In the analysis model, the simulation was performed using the same method as in Example 1, except that the thickness of the first and second adsorption sheets was set to 250 μm, and the thickness of each spacer (distance L between the first and second adsorption sheets) was set to 500 μm, and the pressure loss was calculated. As a result, the pressure loss in Comparative Example 1 was 1.4 kPa.

[0100] <Amount of adhesive sheet to be installed> Using the same method as in Example 1, the amount of nitrogen element per unit volume of internal space in the containment section was calculated when the adsorption sheet used in the above analytical model was mounted on the adsorption device. In Comparative Example 1, this amount was 1363 mol / m³. 3 In Comparative Example 1, it was assumed that the adsorption sheet in the analytical model was the same as the adsorption sheet S described above. That is, for the adsorption sheet (thickness 250 μm) in the analytical model, the basis weight was 130 g / m². 2 We assumed that the density d of the element nitrogen was 7.9 mmol / g.

[0101] [Table 1]

[0102] The simulation results show that, according to the configuration of Example 1, the pressure loss when gas is introduced can be reduced while maintaining the amount of adsorption sheet installed, compared to Comparative Example 1. [Industrial applicability]

[0103] The adsorption apparatus of this embodiment is suitable for recovering acidic gases, particularly carbon dioxide. [Explanation of Symbols]

[0104] 1a First Adsorption Sheet 1b Second Adsorption Sheet 10. Ventilation paths 20 Storage Units 100 Adsorption device A, B Spacer

Claims

1. The system comprises a first suction sheet and a second suction sheet, The first adsorption sheet and the second adsorption sheet are arranged in the thickness direction of the first adsorption sheet. The thickness of the first adsorption sheet and the second adsorption sheet is 270 μm or more. An adsorption device in which the distance between the first adsorption sheet and the second adsorption sheet is 520 μm or more.

2. The adsorption device according to claim 1, further comprising a spacer A disposed between the first adsorption sheet and the second adsorption sheet.

3. The adsorption device according to claim 2, wherein the spacer A is in contact with the main surface of the first adsorption sheet and the main surface of the second adsorption sheet, respectively.

4. The spacers A are provided in multiple locations, The adsorption device according to claim 2, wherein a plurality of the spacers A are arranged in a matrix.

5. Further comprising a third suction sheet and spacer B, The first adsorption sheet, the second adsorption sheet, and the third adsorption sheet are arranged in this order in the thickness direction. The adsorption device according to claim 2, wherein the spacer B is positioned between the second adsorption sheet and the third adsorption sheet and overlaps the spacer A in a plan view.

6. The adsorption device according to claim 1, further comprising a housing section for housing the first adsorption sheet and the second adsorption sheet.

7. The adsorption device according to claim 6, wherein the receiving section applies a load to the first adsorption sheet that compresses the first adsorption sheet in the thickness direction.

8. The suction device according to claim 6, wherein the first suction sheet is detachable from the housing portion.

9. The adsorption device according to claim 1, wherein the space between the first adsorption sheet and the second adsorption sheet is a ventilation path.

10. During the adsorption operation in which gas G is adsorbed onto the first adsorption sheet, the gas G passes through the ventilation path, The adsorption apparatus according to claim 9, wherein during a desorption operation in which the gas G adsorbed by the first adsorption sheet is desorbed from the first adsorption sheet, a gaseous heat transfer medium passes through the ventilation path.

11. The adsorption apparatus according to claim 10, wherein the gas G is an acidic gas.

12. The adsorption apparatus according to claim 1, wherein each of the first adsorption sheet and the second adsorption sheet is in the shape of a flat plate.

13. The adsorption apparatus according to claim 1, wherein the first adsorption sheet comprises a polymer having an amino group.

14. The adsorption apparatus according to claim 13, wherein the polymer has constituent units derived from an epoxy compound and constituent units derived from an amine compound.

15. The adsorption device according to claim 13, wherein the first adsorption sheet has a three-dimensional network structure containing the polymer.

Images