Reactor and method for manufacturing same, gas recovery device, and gas recovery system

Abstract

This reactor comprises: a honeycomb structure comprising an outer peripheral wall 10, porous separating walls 30 that are disposed inside the outer peripheral wall 10 and that demarcate and form first cells 23, second cells 24 and third cells 25 which extend from an inflow end surface 20 to an outflow end surface 21, and through which a process gas containing a gas to be captured can flow, first plugging portions 40 provided in the first cells 23 on the inflow end surface 20 side, second plugging portions 41 provided in the second cells 24 on the outflow end surface 21 side, and third plugging portions 42 provided in the third cells 25 on the outflow end surface 21 side, the third cells 25 being interposed between the first cells 23 and the second cells 24; and a pellet-like functional material 50 with which the third cells 25 are filled.

Description

Reactor and manufacturing method thereof, gas recovery device, and gas recovery system

[0001] The present invention relates to a reactor and a method for manufacturing the same, a gas recovery device, and a gas recovery system.

[0002] As a measure to combat global warming, there is a growing demand for the capture of CO2 from factory exhaust gases and combustion exhaust gases from CO2 emission sources such as thermal power plants, as well as the direct capture and fixation of CO2 from the atmosphere (direct air capture: DAC), and the effective use of captured CO2 through methanation, etc.

[0003] The main methods proposed for CO2 capture include adsorbing CO2 onto an adsorbent capable of adsorbing CO2, releasing the CO2 by varying the temperature, pressure, humidity, etc., and capturing it as highly concentrated CO2, which can then be used as a raw material for the chemical industry, or injected underground for immobilization. Adsorbents are used by being supported on porous pellets, porous particles, fiber filters, honeycomb structures, etc. (e.g., Non-Patent Document 1).

[0004] "Cost and Evaluation of Direct Air Capture (DAC) Method for Carbon Dioxide (Vol. 2) - Adsorption Separation Process -", ​​Japan Science and Technology Agency, Low Carbon Society Strategy Center, March 2021

[0005] In Non-Patent Document 1, the thickness of the partition wall is 0.15 mm, and the cell density is 400 cells / inch. 2 (62 pieces / cm 2The publication describes a reactor in which an adsorbent is supported (an adsorbent layer is formed) on the surface of the partition walls of a honeycomb structure made of mullite, with an opening ratio of 75.0%. Because the amount of CO2 recovered is proportional to the amount of adsorbent held in the reactor, increasing the amount of CO2 recovered can be achieved by placing as much adsorbent as possible in the reactor. However, in the method of supporting an adsorbent on the surface of the partition walls of a honeycomb structure, increasing the amount of adsorbent reduces the opening ratio of the honeycomb structure due to the thickness of the adsorbent layer, resulting in increased pressure loss when a CO2-containing process gas flows through the honeycomb structure. As a result, the power energy required to flow the process gas through the honeycomb structure increases, increasing the operating costs of the reactor. Furthermore, as the thickness of the adsorbent layer increases, it becomes more difficult for the process gas to reach the interior of the adsorbent layer, thereby reducing the CO2 adsorption performance. Similarly, during the CO2 desorption process, there is also the problem of difficulty in fully desorbing CO2 from the interior of the adsorbent layer.

[0006] Furthermore, considering the deterioration of the adsorbent during long-term use of a reactor, maintaining as much adsorbent as possible in the reactor is effective in extending the maintenance interval, but the above-mentioned methods have limitations in increasing the amount of adsorbent retained. On the other hand, methods such as supporting the adsorbent on porous pellets or molding the adsorbent itself into pellets are also possible, but these methods are inferior in terms of contact area with the process gas and pressure loss compared to methods in which the adsorbent is supported on the surface of the partition walls of a honeycomb structure. Furthermore, while it is possible to form the partition walls of a honeycomb structure with an adsorbent, this makes it difficult for the process gas to sufficiently diffuse in the thickness direction of the partition walls and also reduces the strength of the honeycomb structure. The above description has been given using an example of a reactor in which the target gas to be captured is CO2 and an adsorbent capable of adsorbing CO2 is used. However, similar problems can occur even in reactors in which the target gas to be captured is a component other than CO2 and a functional material other than an adsorbent capable of adsorbing CO2 is used.

[0007] The present invention has been made to solve the above-mentioned problems, and aims to provide a reactor that can increase the amount of recovered gas to be captured by increasing the amount of functional material held while suppressing an increase in pressure loss, a method for manufacturing the reactor, a gas recovery device, and a gas recovery system.

[0008] As a result of extensive research into reactors equipped with honeycomb structures, the present inventors have discovered that the above-mentioned problems can be solved by selectively filling specific cells of a honeycomb structure having a specific structure with a functional material, and have thus completed the present invention. That is, the present invention is exemplified as follows.

[0009] (1) A reactor comprising: an outer peripheral wall; porous partition walls disposed inside the outer peripheral wall, through which a treatment gas containing a target gas to be captured can flow, the partition walls defining first, second, and third cells extending from an inflow end face to an outflow end face; a honeycomb structure having first plugging portions provided in the first cells on the inflow end face side, second plugging portions provided in the second cells on the outflow end face side, and third plugging portions provided in the third cells on the outflow end face side, the third cells being interposed between the first and second cells; and a pellet-like functional material filled in the third cells.

[0010] (2) The reactor according to (1), wherein the honeycomb structure further has a fourth plugging portion provided in the third cell on the inflow end face side.

[0011] (3) The reactor according to (1) or (2), wherein the third plugging portion is porous.

[0012] (4) The reactor according to any one of (1) to (3), wherein the first plugging portion and the second plugging portion are dense.

[0013] (5) The reactor according to any one of (2) to (4), wherein the fourth plugging portion is porous.

[0014] (6) The reactor according to any one of (1) to (5), wherein in a cross section perpendicular to a direction in which the first cell, the second cell, and the third cell extend, the first cell, the second cell, and the third cell have a shape that is a triangle, a rectangle, a hexagon, an octagon, or a combination thereof.

[0015] (7) The reactor according to any one of (1) to (6), wherein the outer peripheral wall and the partition walls are mainly composed of one or more selected from cordierite, mullite, alumina, silicon carbide, and Si-bonded silicon carbide.

[0016] (8) The reactor according to any one of (1) to (7), wherein the partition wall has a thickness of 0.05 mm to 5 mm.

[0017] (9) The reactor according to any one of (1) to (8), wherein the porosity of the partition walls is 30% or more and less than 80%.

[0018] (10) The reactor according to any one of (1) to (9), wherein the partition walls have an average pore size of 10 μm to 300 μm.

[0019] (11) The reactor according to any one of (1) to (10), wherein the functional material is an adsorbent.

[0020] (12) The reactor according to (11), wherein the adsorbent is at least one selected from an amine compound, an organometallic complex, and nanoporous ceramics or mesoporous silica carrying the amine compound and / or the organometallic complex.

[0021] (13) The reactor according to (12), wherein the particle diameter of the pellet-shaped functional material is smaller on the outflow end face side than on the center portion in the extension direction of the third cell.

[0022] (14) The reactor according to (12) or (13), wherein the particle diameter of the pellet-shaped functional material is larger on the outer wall side than on the center side in a direction perpendicular to the direction in which the third cells extend.

[0023] (15) The reactor according to any one of (1) to (14), wherein the first cell and / or the second cell is arranged at a position facing the outer peripheral wall.

[0024] (16) The reactor according to any one of (1) to (15), wherein the first plugging portion, the second plugging portion, and the third plugging portion are made of a resin sheet.

[0025] (17) The reactor according to any one of (2) to (16), wherein the third plugging portion and the fourth plugging portion are made of a resin porous sheet.

[0026] (18) The reactor according to any one of (1) to (17), wherein the honeycomb structure has a quadrangular prism shape in which the length of one side of the inflow end face and the outflow end face is 100 to 500 mm, and the length in the direction in which the first cells, the second cells, and the third cells extend is 100 to 1000 mm.

[0027] (19) A method for manufacturing a reactor, comprising: a step of preparing a honeycomb structure having an outer peripheral wall and porous partition walls disposed inside the outer peripheral wall, through which a treatment gas containing a target gas to be captured can flow, the honeycomb structure having first cells, second cells, and third cells extending from an inflow end face to an outflow end face, the third cells being interposed between the first cells and the second cells; a step of forming second plugging portions and third plugging portions on the outflow end face sides of the second cells and the third cells, respectively; a step of filling the third cells with a pellet-shaped functional material; and a step of forming first plugging portions on the inflow end face sides of the first cells.

[0028] (20) A method for manufacturing a reactor, comprising: a step of preparing a honeycomb structure having an outer peripheral wall and porous partition walls disposed inside the outer peripheral wall, through which a treatment gas containing a gas to be captured can flow, the honeycomb structure having first cells, second cells, and third cells extending from an inflow end face to an outflow end face, the third cells being interposed between the first cells and the second cells; a step of forming second plugging portions and third plugging portions on the outflow end face sides of the second cells and the third cells, respectively; a step of filling the third cells with a pellet-shaped functional material; and a step of forming first plugging portions and fourth plugging portions on the inflow end faces of the first cells and the third cells, respectively.

[0029] (21) A gas recovery device for recovering and releasing a target gas contained in a treatment gas, the gas recovery device comprising: a reactor according to any one of (1) to (18); a gas supply pipe capable of supplying the treatment gas or a purge gas to an inlet of the reactor; and a gas discharge pipe capable of discharging the treatment gas or the purge gas from an outlet of the reactor.

[0030] (22) The gas recovery device according to (21), wherein the gas supply pipe has a gas supply branch pipe branched into two, the gas supply branch pipe being a first gas supply branch pipe capable of supplying the processing gas and a second gas supply branch pipe capable of supplying the purge gas; the gas exhaust pipe has a gas exhaust branch pipe branched into two, the gas exhaust branch pipe being a first gas exhaust branch pipe capable of exhausting the processing gas and a second gas exhaust branch pipe capable of exhausting the purge gas; and the gas recovery device further includes a supply gas switching valve capable of blocking the first gas supply branch pipe or the second gas supply branch pipe, and an exhaust gas switching valve capable of blocking the first gas exhaust branch pipe or the second gas exhaust branch pipe.

[0031] (23) The gas recovery apparatus according to (21), wherein the gas supply pipe has two independent gas supply pipes, the gas supply pipe being a first gas supply pipe capable of supplying the processing gas and a second gas supply pipe capable of supplying the purge gas; the gas exhaust pipe has two independent gas exhaust pipes, the gas exhaust pipe being a first gas exhaust pipe capable of exhausting the processing gas and a second gas exhaust pipe capable of exhausting the purge gas; the reactor can be disposed between the first gas supply pipe and the first gas exhaust pipe or between the second gas supply pipe and the second gas exhaust pipe; and the gas recovery apparatus further comprises a transfer mechanism capable of transferring the reactor between the first gas supply pipe and the first gas exhaust pipe or between the second gas supply pipe and the second gas exhaust pipe.

[0032] (24) The gas recovery apparatus according to any one of (21) to (23), further comprising a heating mechanism capable of heating the reactor.

[0033] (25) A gas recovery system for recovering and releasing a gas to be captured contained in a process gas, comprising: a gas recovery device including a detachable part that can attach and detach the reactor described in any one of (1) to (18), a gas supply pipe that can supply the process gas to an inlet of the reactor, and a gas discharge pipe that can discharge the process gas from an outlet of the reactor; a gas release device including a detachable part that can attach and detach the reactor, a gas supply pipe that can supply a purge gas to the inlet of the reactor, and a gas discharge pipe that can discharge the purge gas from the outlet of the reactor; and a transfer device that can transfer the reactor from which the gas to be captured has been recovered by the gas recovery device to the gas release device, and can transfer the reactor from which the gas to be captured has been released by the gas discharge device to the gas recovery device.

[0034] (26) The gas recovery system according to (25), wherein the transfer device includes a vehicle.

[0035] According to the present invention, it is possible to provide a reactor, a manufacturing method thereof, a gas recovery device, and a gas recovery system that can increase the amount of gas recovered by increasing the amount of functional material held while suppressing an increase in pressure loss.

[0036] FIG. 1 is a schematic diagram of an inlet end face of a reactor according to one embodiment of the present invention. FIG. 1 is a schematic diagram of an outlet end face of the reactor of FIG. 1A. FIG. 1 is a schematic diagram of a cross section taken along line a-a' in FIGS. 1A and 1B. FIG. 1 is a partially enlarged view illustrating the flow of a process gas. FIG. 1 is a schematic diagram of an inlet end face of a reactor according to another embodiment of the present invention. FIG. 2 is a schematic diagram of an outlet end face of the reactor of FIG. 2A. FIG. 2 is a partially enlarged view of the inlet end face illustrating the shape of each cell. FIG. 2 is a partially enlarged view of the inlet end face illustrating the shape of each cell. FIG. 2 is a partially enlarged view of the inlet end face illustrating the shape of each cell. FIG. 2 is a partially enlarged view of the inlet end face illustrating the shape of each cell. FIG. 2 is a partially enlarged view of the inlet end face illustrating the shape of each cell. FIG. 3 is a partially enlarged view of the inlet end face illustrating the shape of each cell. FIG. 3 is a schematic diagram of an inlet end face of a reactor according to another embodiment of the present invention. FIG. 9 is a schematic diagram of an outlet end face of the reactor of FIG. 9A. FIG. 9A and 9B are a schematic diagram of a cross section taken along line c-c'. FIG. 9B are partially enlarged views illustrating the flow of a process gas. FIG. 11A is a schematic diagram of an inlet end face of a reactor according to another embodiment of the present invention. FIG. 11A is a schematic diagram of a cross section taken along line dd' in FIG. It is a schematic diagram showing the configuration of a gas recovery device according to one embodiment of the present invention. It is a schematic diagram showing the configuration of a gas recovery device according to another embodiment of the present invention. It is a schematic diagram showing the configuration of a gas recovery system according to one embodiment of the present invention.

[0037] A reactor according to an embodiment of the present invention includes an outer peripheral wall, porous partition walls disposed inside the outer peripheral wall and allowing the flow of a treatment gas containing a target gas to be captured, the partition walls defining first, second, and third cells extending from an inflow end face to an outflow end face, a honeycomb structure having first plugging portions provided in the first cells on the inflow end face side, second plugging portions provided in the second cells on the outflow end face side, and third plugging portions provided in the third cells on the outflow end face side, with the third cells interposed between the first and second cells, and a functional material filled in the third cells.

[0038] Furthermore, a method for manufacturing a reactor according to an embodiment of the present invention includes the steps of: preparing a honeycomb structure having an outer peripheral wall; and porous partition walls disposed inside the outer peripheral wall, through which a treatment gas containing a target gas to be captured can flow, the honeycomb structure having first, second, and third cells extending from an inflow end face to an outflow end face, the third cells being separated from the first cells; forming second and third plugging portions on the outflow end face sides of the second and third cells, respectively; filling the third cells with a functional material; and forming first plugging portions on the inflow end face side of the first cells.

[0039] Furthermore, a gas recovery device according to an embodiment of the present invention is for recovering and releasing a target gas contained in a treatment gas, and includes the reactor, a gas supply pipe capable of supplying the treatment gas or a purge gas to an inlet of the reactor, and a gas discharge pipe capable of discharging the treatment gas or the purge gas from an outlet of the reactor.

[0040] Furthermore, a gas recovery system according to an embodiment of the present invention is for recovering and releasing a target gas contained in a treatment gas, and comprises: a gas recovery device including a detachable part that can be attached to and detached from the reactor, a gas supply pipe that can supply the target gas to the inlet of the reactor, and a gas discharge pipe that can discharge the target gas from the outlet of the reactor; a gas release device including a detachable part that can be attached to and detached from the reactor, a gas supply pipe that can supply a purge gas to the inlet of the reactor, and a gas discharge pipe that can discharge the purge gas from the outlet of the reactor; and a transfer device that can transfer the reactor from which the target gas to be captured has been recovered by the gas recovery device to the gas release device, and that can transfer the reactor from which the target gas to be captured has been released by the gas release device to the gas recovery device.

[0041] The reactor and manufacturing method thereof, gas recovery device, and gas recovery system according to the embodiments of the present invention are configured as described above, thereby increasing the amount of the target gas recovered by increasing the amount of functional material held while suppressing an increase in pressure loss. Furthermore, suppressing an increase in pressure loss reduces the power energy required to circulate the treatment gas through the honeycomb structure, which leads to reduced operating costs of the reactor.

[0042] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments, and it should be understood that modifications and improvements made to the following embodiments based on the ordinary knowledge of those skilled in the art without departing from the spirit of the present invention are also within the scope of the present invention.

[0043] <Reactor> The reactor according to the embodiment of the present invention can be suitably used to recover a target gas to be captured contained in a process gas. The target gas is not particularly limited, but examples thereof include exhaust gases emitted from factories, power plants, etc., and the atmosphere. The exhaust gas is not particularly limited, but examples thereof include combustion exhaust gases generated when burning fossil fuels, coal gasification gas obtained by gasifying coal, and natural gas in thermal power plants, steelworks, etc. Furthermore, the target gas to be captured is not particularly limited, but examples thereof include carbon dioxide (CO2), nitrogen oxides (NO x ), sulfur oxides (SO x Among these, the reactor according to the embodiment of the present invention is particularly useful for recovering carbon dioxide (CO2) contained in combustion exhaust gas and the atmosphere.

[0044] Figure 1A is a schematic diagram of the inlet end of a reactor according to one embodiment of the present invention, Figure 1B is a schematic diagram of the outlet end of the reactor of Figure 1A, and Figure 1C is a schematic diagram of a cross section taken along line aa' of Figures 1A and 1B. 1A to 1C, the reactor 100 includes an outer peripheral wall 10, porous partition walls 30 disposed inside the outer peripheral wall 10 and defining first cells 23, second cells 24, and third cells 25 extending from an inlet end face 20 to an outlet end face 21, a honeycomb structure having first plugging portions 40 provided in the first cells 23 on the inlet end face 20 side, second plugging portions 41 provided in the second cells 24 on the outlet end face 21 side, and third plugging portions 42 provided in the third cells 25 on the outlet end face 21 side, with the third cells 25 interposed between the first cells 23 and the second cells 24, and a functional material 50 filled in the third cells 25. A process gas containing a target gas to be captured can flow through the first cells 23, the second cells 24, and the third cells 25.

[0045] FIG. 1D shows a partially enlarged cross section of the same section as FIG. 1C to illustrate the flow of the process gas. It should be noted that in FIG. 1D , the length of each cell in the extension direction is shorter than in FIG. 1C to facilitate understanding of the description. Also, in FIG. 1D , the arrows indicate the flow direction of the process gas. As shown in FIG. 1D , in the reactor 100, the process gas flows into the second cell 24 and the third cell 25, which are not provided with plugging portions on the inlet end face 20 side. The third cell 25 is filled with a functional material 50, but the process gas can flow through the gaps between the filled functional material 50. Because the second cell 24 has a second plugging portion 41 on the outlet end face 21 side, the process gas that flows into the second cell 24 flows through the porous partition wall 30 into the third cell 25, which is filled with the functional material 50. The process gas that flows into the third cell 25 has the target gas recovered (e.g., adsorbed) by the functional material 50. Since the third plugging portions 42 are provided on the outflow end surface 21 of the third cells 25, the process gas from which the target gas has been collected by the functional material 50 flows into the first cells 23 through the porous partition walls 30. Then, the process gas that has flowed into the first cells 23 flows out from the outflow end surface 21.

[0046] 1A to 1C show an example in which the third cell 25 is interposed entirely between the first cell 23 and the second cell 24. However, the third cell 25 may be interposed at least partially between the first cell 23 and the second cell 24 (i.e., there may be a portion between the first cell 23 and the second cell 24 where the third cell 25 is not interposed). Schematic views of the inlet end face and the outlet end face of a reactor of this configuration are shown in FIGS. 2A and 2B. Note that the cross sections taken along line b-b' in FIGS. 2A and 2B are omitted because they are similar to the cross section taken along line a-a' in FIG. 1A. As shown in FIGS. 2A and 2B, in the reactor 200, the third cell 25 is interposed entirely between the first cell 23 and the second cell 24 in the direction of line b-b', while the third cell 25 is not interposed entirely between the first cell 23 and the second cell 24 in the direction perpendicular to line b-b'. Even with such a structure of the reactor 200, it is possible to obtain the same effects as those of the reactor 100. The arrangement of the first cell 23, the second cell 24, and the third cell 25 is not limited to the forms exemplified in Figures 1A to 1C and 2A to 2B, and may be any arrangement as long as the third cell 25 is interposed at least partially between the first cell 23 and the second cell 24.

[0047] (1. Honeycomb Structure) The shape of the honeycomb structure is not particularly limited as long as it has the above-described structure. For example, the outer shape of a cross section perpendicular to the direction in which the flow channels (first cells 23, second cells 24, and third cells 25) of the honeycomb structure extend can be a polygon such as a triangle, square, hexagon, or octagon, or a round shape such as a circle, ellipse, oval, egg, oval, or rounded rectangle (an overall curved rectangle in which each side and corner is curved and the radius of curvature of each side is larger than the radius of curvature of each corner). Among these shapes, it is preferable that the outer shape of the cross section of the honeycomb structure is quadrangular (i.e., the shape of the honeycomb structure is a square prism). Note that the end faces (inlet end face 20 and outlet end face 21) have the same shape as the cross section.

[0048] In a preferred embodiment, the honeycomb structure has a square prism shape with a side length of 100 to 500 mm (preferably 200 to 400 mm) at the inlet end face 20 and the outlet end face 21, and a length of 100 to 1000 mm (preferably 300 to 500 mm) in the direction of extension of the first cells 23, the second cells 24, and the third cells 25. A honeycomb structure of this size can ensure a sufficient filling amount of the functional material 50 in the third cells 25, thereby ensuring practical use of the reactors 100, 200.

[0049] The shape of each cell (first cell 23, second cell 24, and third cell 25) is not particularly limited, and may be polygonal, such as triangular, rectangular, hexagonal, or octagonal, or round, such as circular, elliptical, oval, egg-shaped, or oval, in a cross section perpendicular to the direction in which the flow paths (first cell 23, second cell 24, and third cell 25) of the honeycomb structure extend. Each cell may have a single shape or a combination of two or more shapes. Among these cell shapes, triangular, rectangular, hexagonal, octagonal, or a combination thereof is preferred. Providing cells with such shapes can reduce pressure loss during the flow of the process gas. The shape of each cell in the cross section is the same as the shape of each cell at the end faces (inlet end face 20 and outlet end face 21).

[0050] Examples of combinations of cells having various shapes are shown in Figures 3 to 8. Figures 3 to 8 are partial enlarged views of the inlet end faces of reactors equipped with cells having various shapes. The embodiment in Figure 3 has two types of hexagonal cells of different sizes. The first cell 23 and the second cell 24 are hexagonal cells of the same size. The hexagonal third cell 25 is smaller than the hexagonal first cell 23 and the second cell 24. The embodiment in Figure 4 has hexagonal cells of the same size. The embodiment in Figure 5 has two types of triangular cells of different sizes. The second cell 24 and the third cell 25 are triangular cells of the same size. The triangular first cell 23 is larger than the triangular second cell 24 and the third cell 25.

[0051] The embodiment of FIG. 6 has octagonal first cells 23 and second cells 24 and a rectangular third cell 25. The embodiment of FIG. 7 has three different sizes of rectangular cells. The first cells 23 and second cells 24 are rectangular cells of the same size. The third cells 25 have two sizes of rectangular shapes, which are smaller than the first cells 23 and second cells 24. The embodiment of FIG. 8 has rectangular and hexagonal cells. The first cells 23 and second cells 24 are rectangular cells of the same size. The third cells 25 are hexagonal. In all of the embodiments of FIGS. 3 to 8, the third cells 25 are arranged between the first cells 23 and second cells 24.

[0052] In the honeycomb structure, the first cells 23 and / or the second cells 24 are preferably arranged at positions facing the peripheral wall 10. Here, a schematic diagram of the inlet end face of a reactor having such a configuration is shown in FIG. 9A, a schematic diagram of the outlet end face is shown in FIG. 9B, and a schematic diagram of the cross section taken along line c-c' in FIGS. 9A and 9B is shown in FIG. 9C. As shown in FIGS. 9A to 9C, the reactor 300 is identical to the reactor 100 except that the first cells 23 are arranged at positions facing the peripheral wall 10. If the third cells 25 filled with the functional material 50 are arranged at positions facing the peripheral wall 10, the inflow or outflow paths for the process gas are reduced, which may prevent the process gas from sufficiently flowing through the third cells 25 facing the peripheral wall 10, and the effect of the functional material 50 may not be fully achieved. Therefore, by arranging the first cells 23 at positions facing the peripheral wall 10 as shown in FIGS. 9A to 9C, the use of unnecessary functional material 50, which is unlikely to fully exert its effect, can be avoided, thereby reducing manufacturing costs. This effect can be obtained not only in the configurations illustrated in Figures 9A to 9C, but also in a configuration in which the second cell 24 is arranged in a position facing the outer peripheral wall 10, or in a configuration in which both the first cell 23 and the second cell 24 are arranged in a position facing the outer peripheral wall 10.

[0053] The honeycomb structure may be a honeycomb bonded body having a plurality of honeycomb segments and a bonding layer bonding the outer peripheral surfaces (the outer peripheral surfaces parallel to the extension direction of the honeycomb segments) of the plurality of honeycomb segments together. The use of a honeycomb bonded body makes it possible to increase the total cross-sectional area of ​​the cells, which is important for ensuring the flow rate of the process gas, while suppressing the occurrence of cracks. The bonding layer can be formed using a bonding material. The bonding material is not particularly limited, but a paste-like material obtained by adding a solvent such as water to a ceramic material can be used. The bonding material may contain the same material as the outer peripheral wall 10 and the partition walls 30. In addition to bonding the honeycomb segments together, the bonding material can also be used as an outer peripheral coating material after the honeycomb segments are bonded.

[0054] The thickness of the partition walls 30 is not particularly limited, but is preferably 0.05 mm to 5 mm, more preferably 0.10 mm to 4.5 mm, and even more preferably 0.15 mm to 4 mm, from the viewpoints of ensuring the strength of the honeycomb structure and reducing pressure loss when a process gas passes through the partition walls 30. In this specification, the "thickness of the partition walls 30" refers to the length of a line segment that connects the centers of gravity of adjacent cells in a cross section of the honeycomb structure that is perpendicular to the direction in which the flow paths (first cells 23, second cells 24, and third cells 25) extend, and the length of the line segment that crosses the partition walls 30. The thickness of the partition walls 30 refers to the average value of the thicknesses of all the partition walls 30.

[0055] The porosity of the partition walls 30 is not particularly limited, but is preferably 30% or more and less than 80%, more preferably 35% to 75%, and even more preferably 40% to 70%, from the viewpoints of ensuring the strength of the honeycomb structure and reducing the pressure loss when the process gas passes through the partition walls 30. In this specification, the "porosity of the partition walls 30" means the porosity of the partition walls 30 measured by mercury porosimetry in accordance with JIS R1655:2003.

[0056] The average pore diameter of the partition walls 30 is not particularly limited, but is preferably 10 μm to 300 μm, more preferably 15 μm to 280 μm, and even more preferably 20 μm to 260 μm, from the viewpoint of ensuring the strength of the honeycomb structure and reducing the pressure loss when the process gas passes through the partition walls 30. In this specification, the "average pore diameter of the partition walls 30" means the pore diameter of the partition walls 30 at an integrated value of 50% in the pore distribution determined by mercury intrusion porosimetry in accordance with JIS R1655:2003.

[0057] The thickness of the peripheral wall 10 is not particularly limited, but is preferably 0.05 mm to 10 mm, more preferably 0.20 mm to 8 mm, and even more preferably 0.30 mm to 6 mm, from the viewpoint of ensuring the strength of the honeycomb structure. In this specification, the thickness of the peripheral wall 10 refers to the length in the normal direction to the peripheral surface of the honeycomb structure from the boundary between the peripheral wall 10 and the outermost cell or partition wall 30 to the peripheral surface of the honeycomb structure, in a cross section perpendicular to the direction in which the flow paths (first cells 23, second cells 24, and third cells 25) of the honeycomb structure extend.

[0058] The cell density of the honeycomb structure is not particularly limited, but from the viewpoints of ensuring the strength of the honeycomb structure and increasing the amount of filling of the functional material 50, it is preferable that the cell density be 0.05 cells / cm. 2 ~25 cells / cm 2 Preferably, the density is 0.1 cells / cm 2 ~20 cells / cm 2 More preferably, 0.5 cells / cm 2 ~15 cells / cm 2 In this specification, the term "cell density" refers to a value obtained by dividing the number of cells by the area of ​​one end face of the honeycomb structure (the total area of ​​the partition walls 30, the first cells 23, the second cells 24, and the third cells 25 excluding the outer peripheral wall 10).

[0059] The material of the outer peripheral wall 10 and the partition walls 30 is not particularly limited, but from the viewpoint of ensuring the strength of the honeycomb structure, it is preferable that the main component be one or more selected from cordierite, mullite, alumina, silicon carbide, and Si-bonded silicon carbide.

[0060] The first plugging portion 40 and the second plugging portion 41 are preferably, but not limited to, dense. Such a configuration makes it easier for the process gas to flow through the flow path as described above. Here, in this specification, "dense" means that the porosity is 10% or less. The porosity of the first plugging portion 40 and the second plugging portion 41 may be 5% or less.

[0061] Although the third plugging portions 42 are not particularly limited, they are preferably porous. With this configuration, as shown in FIG. 10 , the process gas from which the target gas to be captured has been recovered by the functional material 50 also flows out from the outflow end surface 21 through the porous third plugging portions 42, thereby reducing pressure loss during the flow of the process gas. Note that FIG. 10 is a partially enlarged view of a cross section similar to FIG. 1D to illustrate the flow of the process gas. Note that, in this specification, "porous" means that the porosity is 20% or more. Note that the porosity of the third plugging portions 42 may be 30% or more.

[0062] The materials for the first plugging portion 40, the second plugging portion 41, and the third plugging portion 42 are not particularly limited and can be made of known materials such as ceramics and resins. The characteristics of the first plugging portion 40, the second plugging portion 41, and the third plugging portion 42 can be ensured by appropriately selecting the type of material used. For example, if the first plugging portion 40 and the second plugging portion 41 are dense, a resin sheet, dense ceramics, glass, or the like may be selected and used, and from the viewpoints of manufacturing cost, productivity, etc., it is preferable to select and use a resin sheet. Similarly, if the third plugging portion 42 is porous, a resin porous sheet, porous ceramics, glass, or the like may be selected and used, and from the viewpoints of manufacturing cost, productivity, etc., it is preferable to select and use a resin porous sheet.

[0063] In addition to the first plugging portion 40, the second plugging portion 41, and the third plugging portion 42, the honeycomb structure may further include a fourth plugging portion provided in the third cell 25 on the inlet end surface 20 side. This configuration can prevent the functional material 50 filled in the third cell 25 from escaping from the third cell 25. A schematic diagram of the inlet end surface of a reactor having a fourth plugging portion is shown in FIG. 11A, and a schematic diagram of the cross section taken along line dd' in FIG. 11A is shown in FIG. 11B. A schematic diagram of the outlet end surface of this reactor is omitted because it appears similar to FIG. 1B. As shown in FIGS. 11A and 11B, the reactor 400 has the same basic structure as the reactor 100 described above, but further includes a fourth plugging portion 43 provided in the third cell 25 on the inlet end surface 20 side.

[0064] The material of the fourth plugging portion 43 is not particularly limited and can be composed of known materials such as ceramics and resins. The characteristics of the fourth plugging portion 43 can be ensured by appropriately selecting the type of material used. For example, the fourth plugging portion 43 may be dense or porous. However, if the fourth plugging portion 43 is dense, the process gas will not flow in from the inlet end surface 20 of the third cell 25, which may increase pressure loss. Therefore, it is preferable that the fourth plugging portion 43 be porous. This configuration ensures a process gas flow path similar to that shown in FIG. 1D, thereby reducing pressure loss during process gas flow. When the fourth plugging portion 43 is porous, a resin porous sheet, porous ceramics, glass, or the like may be selected and used. From the viewpoints of manufacturing cost and productivity, it is preferable to select a resin porous sheet.

[0065] (2. Functional Material) The functional material 50 is not particularly limited as long as it is capable of recovering the target gas contained in the process gas, and for example, an adsorbent can be used. By using an adsorbent as the functional material 50, the target gas can be adsorbed and recovered, and the recovered target gas can be easily desorbed by changing conditions such as temperature. Here, the term "adsorbent" in this specification means a material that can attract and store the target gas contained in the process gas.

[0066] The adsorbent is not particularly limited and may be selected appropriately depending on the type of gas to be captured. Examples of adsorbents effective for adsorbing target gases such as carbon dioxide (CO2) include amine compounds, organometallic complexes, and nanoporous ceramics or mesoporous silica supported with amine compounds and / or organometallic complexes. These may be used alone or in combination of two or more. Examples of amine compounds include, but are not limited to, monoethanolamine (MEA) and N-methyldiethanolamine (MDEA). Examples of organometallic complexes include, but are not limited to, porous metal-organic frameworks (MOFs) having a structure capable of adsorbing target gases in their pores.

[0067] The functional material 50 is pellet-shaped. Using the pellet-shaped functional material 50 makes it difficult for the functional material 50 to escape from the third cells 25, and increases the space between the functional material 50, thereby reducing pressure loss. In this specification, "pellet-shaped" refers to a shape with a substantially uniform thickness, such as a sphere, a cylinder, an elliptical cylinder, or a polygonal prism (e.g., a triangular prism, a quadrangular prism, a pentagonal prism, a hexagonal prism, etc.), and its cross section may be circular, elliptical, polygonal, or the like. The particle diameter of the pellet-shaped functional material 50 (hereinafter sometimes referred to as "pellet diameter") is not particularly limited, but is, for example, 0.025 to 10 mm, preferably 0.1 to 10 mm, more preferably 0.5 to 10 mm, and even more preferably 1 to 10 mm. The pellet diameter refers to the average value of the minor axis and the major axis. A typical pellet-shaped functional material 50 is spherical or cylindrical with a diameter or length of 0.3 to 10 mm.

[0068] The particle diameter of the pellet-shaped functional material 50 is not particularly limited, but is preferably smaller at the outflow end face 21 side than at the center in the extension direction of the third cells 25. The process gas flowing from the second cells 24 and flowing into the third cells 25 through the partition walls 30 is more likely to flow toward the outflow end face 21 side than toward the center in the extension direction of the third cells 25. Therefore, the above-described configuration prevents the process gas from preferentially flowing toward the outflow end face 21 side, making it easier to uniformly flow the process gas throughout the entire extension direction of the third cells 25. The particle diameter of the pellet-shaped functional material 50 is determined by the following method. Using a microvideoscope manufactured by Keyence Corporation, the diameter of the smallest circle circumscribing the pellet-shaped functional material 50 is measured. This measurement is performed on 100 randomly selected pellet-shaped functional material 50, and the average value is taken as the particle diameter of the pellet-shaped functional material 50.

[0069] The particle diameter of the pellet-shaped functional material 50 is preferably larger on the outer peripheral wall 10 side than on the center side in the direction perpendicular to the extension direction of the third cells 25. The process gas flows easily through the center, but the process gas flows less easily on the outer peripheral wall 10 side than on the center side. Therefore, by adopting the above-described configuration, the process gas is prevented from preferentially flowing into the third cells 25 in the center, and the process gas can be more easily uniformly flowed throughout the entire area in the direction perpendicular to the extension direction of the third cells 25.

[0070] The filling rate of the pellet-shaped functional material 50 in the second cell 24 is not particularly limited, but is preferably 20 to 70%. By controlling the filling rate to such a level, it is possible to increase the recovery efficiency of the target gas contained in the processing gas. Here, the filling rate is, for example, calculated by multiplying the mass (kg) of the filled pellets by the density (kg / m 3 ) to calculate the volume of the filled pellets, and then use this to calculate the volume of the second cell 24 (m 3 ) and multiplying by 100.

[0071] The reactors 100, 200, and 300 according to the embodiments of the present invention are preferably arranged and used so that the extension direction of each cell is vertical, with the inlet end face 20 at the top and the outlet end face 21 at the bottom. By using the reactors 100, 200, and 300 in this manner, it is possible to prevent the functional material 50 from leaking out. Furthermore, the reactor 400 according to the embodiments of the present invention is provided with the fourth plugging portion 43, so there is no risk of the functional material 50 leaking out. Therefore, the reactor 400 according to the embodiments of the present invention can be arranged and used so that the extension direction of each cell is not only vertical but also in various directions (for example, horizontal).

[0072] <Method for Manufacturing Reactor> The method for manufacturing the reactor according to the embodiment of the present invention is not particularly limited as long as it can form the above structure. For example, a method for manufacturing the reactors 100, 200, and 300 according to the embodiment of the present invention includes the steps of: preparing a honeycomb structure having an outer peripheral wall 10 and porous partition walls 30 disposed inside the outer peripheral wall 10, through which a treatment gas containing a target gas to be captured can flow, the partition walls 30 defining first cells 23, second cells 24, and third cells 25 extending from an inlet end face 20 to an outlet end face 21, with the third cells 25 interposed between the first cells 23 and the second cells 24 (Step 1A); forming second plugging portions 41 and third plugging portions 42 on the outlet end face 21 side of the second cells 24 and the third cells 25, respectively (Step 2A); filling the third cells 25 with a functional material 50 (Step 3A); and forming first plugging portions 40 on the inlet end face 20 side of the first cells 23 (Step 4A).

[0073] In step 1A, the method for manufacturing the honeycomb structure is not particularly limited and can be carried out in accordance with methods known in the art. For example, the honeycomb structure can be manufactured as follows. First, a clay containing ceramic powder is extruded into a desired shape to produce a honeycomb formed body. By selecting an appropriate die and jig, the shape and density of each cell, the shape and thickness of the partition walls 30 and the outer peripheral wall 10, etc. can be controlled. The ceramic powder can be the aforementioned ceramic powder or a raw material powder (e.g., a cordierite raw material) that will become the aforementioned ceramic after firing. The cordierite raw material is a raw material that will become cordierite upon firing. The cordierite raw material preferably has a chemical composition of 30 to 45 mass% alumina (Al2O3) (including aluminum hydroxide converted to alumina), 11 to 17 mass% magnesia (MgO), and 42 to 57 mass% silica (SiO2). The clay may contain a binder, a pore-forming agent, a dispersant, water, an organic solvent, etc. The porosity and average pore diameter of the partition walls 30 can be controlled by appropriately selecting the type and amount of the ceramic powder, binder, pore-forming agent, and dispersant used. Next, the honeycomb formed body obtained above is dried and fired to obtain a honeycomb structure. The drying method is not particularly limited, and conventionally known drying methods such as hot air drying, microwave drying, dielectric drying, reduced pressure drying, vacuum drying, and freeze drying can be used. Among these, a drying method that combines hot air drying with microwave drying or dielectric drying is preferred because it can dry the entire honeycomb formed body quickly and uniformly.

[0074] Next, in step 2A, second plugging portions 41 and third plugging portions 42 are formed on the outflow end faces 21 of the second cells 24 and third cells 25 of the honeycomb structure obtained above, respectively. The method for forming each plugging portion is not particularly limited and can be performed according to a conventional method. For example, when each plugging portion is made of a resin sheet, the second plugging portions 41 and third plugging portions 42 can be formed by attaching the resin sheet to the outflow end faces 21 of the second cells 24 and third cells 25. When each plugging portion is made of ceramics, glass, or the like, first, a thin film having openings corresponding to the second cells 24 and third cells 25 is attached to the outflow end face 21 of the honeycomb structure where the second plugging portions 41 and third plugging portions 42 are to be formed. Next, the outflow end surface 21 of the honeycomb structure is immersed in a slurry plugging material (ceramics, glass, etc.), and the plugging material is allowed to penetrate into the second cells 24 and third cells 25 of the honeycomb structure that are not blocked with a thin film, thereby forming the second plugging portion 41 and the third plugging portion 42.

[0075] Next, in step 3A, the functional material 50 is filled into the third cells 25. The filling method is not particularly limited and may be performed according to a conventional method. Next, in step 4A, the first plugging portions 40 are formed on the inlet end surface 20 side of the first cells 23. The method for forming the first plugging portions 40 may be performed in the same manner as the method for forming the second plugging portions 41 and the third plugging portions 42 described above. The order of steps 2A to 4A is not particularly limited, except that step 3A is performed after step 2A. For example, steps 2A, 3A, and 4A may be performed in this order; steps 2A, 4A, and 3A in this order; or steps 4A, 2A, and 3A in this order.

[0076] A manufacturing method of the reactor 400 according to an embodiment of the present invention includes the steps of: preparing a honeycomb structure having an outer peripheral wall 10; and porous partition walls 30 disposed inside the outer peripheral wall 10, through which a treatment gas containing a target gas to be captured can flow, the partition walls 30 defining first cells 23, second cells 24, and third cells 25 extending from an inflow end face 20 to an outflow end face 21, with the third cells 25 interposed between the first cells 23 and the second cells 24 (step 1B); forming second plugging portions 41 and third plugging portions 42 on the outflow end face 21 sides of the second cells 24 and the third cells 25, respectively; filling the third cells 25 with a functional material 50 (step 3B); and forming first plugging portions 40 and fourth plugging portions 43 on the inflow end faces 20 of the first cells 23 and the third cells 25, respectively (step 4B).

[0077] The manufacturing method of the honeycomb structure in steps 1B to 3B can be performed in the same manner as steps 1A to 3A. In step 4B, first plugging portions 40 and fourth plugging portions 43 are formed on the inlet end faces 20 of the first cells 23 and the third cells 25, respectively. The method of forming the first plugging portions 40 and the fourth plugging portions 43 on the inlet end faces 20 of the first cells 23 and the third cells 25 may be performed in the same manner as the method of forming each plugging portion described above. The order of steps 2B to 4B is steps 2B, 3B, and 4B.

[0078] <Gas Recovery Apparatus> A gas recovery apparatus according to an embodiment of the present invention can be suitably used to recover and release a target gas contained in a process gas. FIG. 12 is a schematic diagram showing the configuration of a gas recovery apparatus according to an embodiment of the present invention. As shown in FIG. 12, the gas recovery apparatus 1000 includes a reactor 1100, a gas supply pipe 1200 capable of supplying a process gas or a purge gas to an inlet 1110 of the reactor 1100, and a gas exhaust pipe 1300 capable of exhausting the process gas or the purge gas from an outlet 1120 of the reactor 1100. The reactor 1100 uses the above-described reactors 100, 200, 300, and 400, which can increase the recovery amount of the target gas by increasing the retention amount of the functional material 50 while suppressing an increase in pressure loss. Therefore, the gas recovery apparatus 1000 can also increase the recovery amount of the target gas while suppressing an increase in pressure loss.

[0079] The gas supply pipe 1200 has a gas supply branch pipe branched into two. This gas supply branch pipe can be a first gas supply branch pipe 1210 capable of supplying a process gas, and a second gas supply branch pipe 1220 capable of supplying a purge gas. The gas exhaust pipe 1300 has a gas exhaust branch pipe branched into two. This gas exhaust branch pipe can be a first gas exhaust branch pipe 1310 capable of exhausting a process gas, and a second gas exhaust branch pipe 1320 capable of exhausting a purge gas. The gas recovery apparatus 1000 further includes a supply gas switching valve 1400 capable of blocking the first gas supply branch pipe 1210 or the second gas supply branch pipe 1220, and an exhaust gas switching valve 1500 capable of blocking the first gas exhaust branch pipe 1310 or the second gas exhaust branch pipe 1320.

[0080] In the gas recovery device 1000 having the above-described structure, when recovering the target gas contained in the treatment gas, the supply gas switching valve 1400 is switched to block the second gas supply branch pipe 1220 and open the first gas supply branch pipe 1210, and the exhaust gas switching valve 1500 is switched to block the second gas exhaust branch pipe 1320 and open the first gas exhaust branch pipe 1310. Next, the treatment gas containing the target gas to be captured is supplied from the first gas supply branch pipe 1210 through the gas supply pipe 1200 to the inlet 1110 of the reactor 1100. The target gas to be captured is recovered from the treatment gas supplied to the reactor 1100 and discharged from the outlet 1120. The discharged treatment gas is discharged from the first gas exhaust branch pipe 1310 via the gas exhaust pipe 1300.

[0081] Next, when the target gas to be captured recovered in the reactor 1100 is to be desorbed, the supply gas switching valve 1400 is switched to open the second gas supply branch pipe 1220 and block the first gas supply branch pipe 1210, and the exhaust gas switching valve 1500 is switched to open the second gas exhaust branch pipe 1320 and block the first gas exhaust branch pipe 1310. Next, purge gas is supplied from the second gas supply branch pipe 1220 through the gas supply pipe 1200 to the inlet 1110 of the reactor 1100. The purge gas supplied to the reactor 1100 is discharged from the outlet 1120 together with the target gas to be captured in the functional material 50 of the reactor 1100. The purge gas containing the target gas to be captured is discharged from the second gas exhaust branch pipe 1320 via the gas exhaust pipe 1300. Here, in this specification, the term "purge gas" refers to a gas that can desorb the target gas captured in the functional material 50 of the reactor 1100 and be discharged from the reactor 1100. The purge gas may be selected appropriately depending on the type of target gas. For example, when the target gas is carbon dioxide, water vapor or the like can be used. The water vapor is preferably at a high temperature of 100°C or higher (for example, 120°C).

[0082] Furthermore, in order to heat the purge gas to a predetermined temperature, the gas recovery system 1000 may further include a heating mechanism capable of heating the reactor 1100. With this configuration, the purge gas at room temperature can be supplied from the second gas supply branch pipe 1220 and heated to a predetermined temperature in the reactor 1100. Therefore, it is not necessary to preheat the purge gas to be supplied to the gas recovery system 1000.

[0083] Fig. 13 is a schematic diagram showing the configuration of a gas recovery apparatus according to another embodiment of the present invention. As shown in Fig. 13, a gas recovery apparatus 2000 has the same basic structure as the gas recovery apparatus 1000 of Fig. 12. That is, the gas recovery apparatus 2000 includes a reactor 1100, a gas supply pipe 1200 capable of supplying a process gas or a purge gas to an inlet 1110 of the reactor 1100, and a gas exhaust pipe 1300 capable of exhausting the process gas or the purge gas from an outlet 1120 of the reactor 1100. Therefore, the gas recovery apparatus 2000 can also increase the recovery amount of the target gas while suppressing an increase in pressure loss.

[0084] The gas supply pipe 1200 has two independent gas supply pipes. The two independent gas supply pipes are a first gas supply pipe 2100 capable of supplying a process gas and a second gas supply pipe 2200 capable of supplying a purge gas. The gas exhaust pipe 1300 has two independent gas exhaust pipes. The two independent gas exhaust pipes are a first gas exhaust pipe 2300 capable of exhausting a process gas and a second gas exhaust pipe 2400 capable of exhausting a purge gas. The reactor 1100 can be disposed between the first gas supply pipe 2100 and the first gas exhaust pipe 2300 or between the second gas supply pipe 2200 and the second gas exhaust pipe 2400. The gas recovery device 2000 further includes a transfer mechanism (not shown) capable of transferring the reactor 1100 between the first gas supply pipe 2100 and the first gas exhaust pipe 2300 or between the second gas supply pipe 2200 and the second gas exhaust pipe 2400. The transfer mechanism is not particularly limited, and a known transfer mechanism (for example, a motor-driven transfer mechanism) can be used.

[0085] In the gas recovery device 2000 having the above structure, when recovering the target gas contained in the treatment gas, the reactor 1100 is disposed between the first gas supply pipe 2100 and the first gas exhaust pipe 2300 by a transfer mechanism. Next, the treatment gas containing the target gas is supplied from the first gas supply pipe 2100 to the inlet 1110 of the reactor 1100. The target gas is recovered from the treatment gas supplied to the reactor 1100 and discharged from the outlet 1120. The discharged treatment gas is discharged from the first gas exhaust pipe 2300. Next, when the target gas recovered in the reactor 1100 is to be desorbed, the reactor 1100 is disposed between the second gas supply pipe 2200 and the second gas exhaust pipe 2400 by a transfer mechanism. Next, a purge gas is supplied from the second gas supply pipe 2200 to the inlet 1110 of the reactor 1100. The purge gas supplied to the reactor 1100 is discharged from the outlet 1120 together with the target gas to be captured that has been captured in the functional material 50 of the reactor 1100. The purge gas containing the target gas to be captured is discharged from the second gas discharge pipe 2400. The same purge gas as described above can be used.

[0086] Furthermore, in order to heat the purge gas to a predetermined temperature, the gas recovery device 2000 may further include a heating mechanism capable of heating the reactor 1100 disposed between the second gas supply pipe 2200 and the second gas exhaust pipe 2400. With this configuration, the purge gas at room temperature can be supplied from the second gas supply pipe 2200 and heated to a predetermined temperature in the reactor 1100. Therefore, there is no need to preheat the purge gas to be supplied to the gas recovery device 2000.

[0087] <Gas Recovery System> A gas recovery system according to an embodiment of the present invention can be suitably used to recover and release a target gas contained in a process gas. FIG. 14 is a schematic diagram showing the configuration of a gas recovery system according to an embodiment of the present invention. As shown in FIG. 14, a gas recovery system 3000 includes a gas recovery device 3100, a gas release device 3200, and a transfer device 3300. The gas recovery device 3100 includes a detachable unit 3110 that can be attached to and detached from the reactor 1100, a gas supply pipe 1200 that can supply a process gas to the inlet 1110 of the reactor 1100, and a gas exhaust pipe 1300 that can exhaust the process gas from the outlet 1120 of the reactor 1100. The gas release device 3200 includes a detachable part 3210 that allows the reactor 1100 to be detached, a gas supply pipe 1200 that can supply a purge gas to the inlet 1110 of the reactor 1100, and a gas discharge pipe 1300 that can discharge the purge gas from the outlet 1120 of the reactor 1100. The transfer device 3300 is capable of transferring the reactor 1100, from which the gas to be captured has been recovered by the gas recovery device 3100, to the gas release device 3200, and of transferring the reactor 1100, from which the gas to be captured has been released by the gas release device 3200, to the gas recovery device 3100.

[0088] In the gas recovery system 3000 having the above structure, when recovering the gas to be captured contained in the process gas, the reactor 1100 is placed in the attachment / detachment section 3110 of the gas recovery device 3100 by the transfer device 3300. Next, the process gas containing the gas to be captured is supplied from the gas supply piping 1200 of the gas recovery device 3100 to the inlet 1110 of the reactor 1100. The process gas supplied to the reactor 1100 has the gas to be captured recovered and discharged from the outlet 1120. The discharged process gas is discharged from the gas discharge piping 1300. Next, when the gas to be captured recovered in the reactor 1100 is to be released, the reactor 1100 placed in the gas recovery device 3100 is moved to the attachment / detachment section 3210 of the gas release device 3200 by the transfer device 3300. Next, a purge gas is supplied from the gas supply pipe 1200 of the gas release device 3200 to the inlet 1110 of the reactor 1100. The purge gas supplied to the reactor 1100 is discharged from the outlet 1120 together with the target gas to be captured that has been captured in the functional material 50 of the reactor 1100. The purge gas containing the target gas to be captured is discharged from the gas discharge pipe 1300. The same purge gas as described above can be used.

[0089] Furthermore, in order to heat the purge gas to a predetermined temperature, the gas discharge device 3200 may further include a heating mechanism capable of heating the reactor 1100. With such a configuration, the purge gas can be supplied at room temperature from the gas supply pipe 1200 and heated to a predetermined temperature in the reactor 1100. Therefore, it is not necessary to preheat the purge gas to be supplied to the gas discharge device 3200.

[0090] The transfer device 3300 is not particularly limited, but may include a vehicle. With this configuration, even if the gas recovery device 3100 and the gas release device 3200 are located at distant locations, the reactor 1100 can be transported efficiently.

[0091] DESCRIPTION OF SYMBOLS 10 Outer peripheral wall 20 Inlet end surface 21 Outlet end surface 23 First cell 24 Second cell 25 Third cell 30 Partition wall 40 First plugging portion 41 Second plugging portion 42 Third plugging portion 43 Fourth plugging portion 50 Functional material 100, 200, 300, 400 Reactor 1000, 2000 Gas recovery device 1100 Reactor 1110 Inlet 1120 Outlet 1200 Gas supply pipe 1210 First gas supply branch pipe 1220 Second gas supply branch pipe 1300 Gas exhaust pipe 1310 First gas exhaust branch pipe 1320 Second gas exhaust branch pipe 1400 Supply gas switching valve 1500 Exhaust gas switching valve 2100 First gas supply pipe 2200 Second gas supply pipe 2300 First gas exhaust pipe 2400 Second gas exhaust pipe 3000 Gas recovery system 3100 Gas recovery device 3110 Detachable unit 3200 Gas release device 3210 Detachable unit 3300 Transfer device

Claims

1. An outer peripheral wall, a porous partition wall disposed inside the outer peripheral wall and partitioning and forming a first cell, a second cell, and a third cell through which a processing gas containing a gas to be captured can flow, extending from an inflow end face to an outflow end face, a first plugging portion provided in the first cell on the inflow end face side, a second plugging portion provided in the second cell on the outflow end face side, and a third plugging portion provided in the third cell on the outflow end face side, having a honeycomb structure in which the third cell is interposed between the first cell and the second cell, and a reactor comprising a pellet-shaped functional material having a particle diameter of 0.025 to 10 mm and filled in the third cell.

2. The reactor according to claim 1, wherein the honeycomb structure further has a fourth plugging portion provided in the third cell on the inflow end face side.

3. The reactor according to claim 1 or 2, wherein the third plugging portion is porous.

4. The reactor according to claim 1 or 2, wherein the first plugging portion and the second plugging portion are dense.

5. The reactor according to claim 2, wherein the fourth plugging portion is porous.

6. In a cross section orthogonal to the direction in which the first cell, the second cell, and the third cell extend, the shapes of the first cell, the second cell, and the third cell are a triangle, a quadrilateral, a hexagon, an octagon, or a combination thereof. The reactor according to claim 1 or 2.

7. The reactor according to claim 1 or 2, wherein the outer peripheral wall and the partition wall are mainly composed of one or more selected from cordierite, mullite, alumina, silicon carbide, and Si-bonded silicon carbide.

8. The reactor according to claim 1 or 2, wherein the thickness of the partition wall is 0.05 mm to 5 mm.

9. The reactor according to claim 1 or 2, wherein the porosity of the partition wall is 30% or more and less than 80%.

10. The reactor according to claim 1 or 2, wherein the average pore diameter of the partition wall is 10 μm to 300 μm.

11. The reactor according to claim 1 or 2, wherein the functional material is an adsorbent.

12. The reactor according to claim 11, wherein the adsorbent is at least one selected from an amine compound, an organometallic complex, and nanoporous ceramics or mesoporous silica on which the amine compound and / or the organometallic complex is supported.

13. The reactor according to claim 12, wherein the particle diameter of the pellet-shaped functional material is smaller on the outflow end face side than at the center in the direction in which the third cell extends.

14. The reactor according to claim 12, wherein the particle diameter of the pellet-shaped functional material is larger on the outer peripheral wall side than at the center in a direction orthogonal to the direction in which the third cell extends.

15. The reactor according to claim 1 or 2, wherein the first cell and / or the second cell is disposed at a position facing the outer peripheral wall.

16. The reactor according to claim 1, wherein the first sealing portion, the second sealing portion, and the third sealing portion are made of a resin sheet.

17. The reactor according to claim 2, wherein the third sealing portion and the fourth sealing portion are made of a resin porous sheet.

18. The reactor according to claim 1 or 2, wherein the honeycomb structure has a quadrangular prism shape in which the length of one side of the inflow end face and the outflow end face is 100 to 500 mm, and the length in the direction in which the first cell, the second cell, and the third cell extend is 100 to 1000 mm.

19. A step of preparing a honeycomb structure having an outer peripheral wall and a porous partition wall disposed inside the outer peripheral wall and partitioning the first cell, the second cell, and the third cell that extend from an inflow end face to an outflow end face through which a treatment gas containing a gas to be captured can flow, and the third cell is interposed between the first cell and the second cell; A step of forming a second sealing portion and a third sealing portion on the outflow end face sides of the second cell and the third cell, respectively; A step of filling the third cell with a pellet-shaped functional material having a particle diameter of 0.025 to 10 mm; A step of forming a first sealing portion on the inflow end face side of the first cell A method for manufacturing a reactor, including.

20. A step of preparing a honeycomb structure having an outer peripheral wall and a porous partition wall disposed inside the outer peripheral wall and partitioning the first cell, the second cell, and the third cell that extend from an inflow end face to an outflow end face through which a treatment gas containing a gas to be captured can flow, and the third cell is interposed between the first cell and the second cell; A step of forming a second sealing portion and a third sealing portion on the outflow end face sides of the second cell and the third cell, respectively; A step of filling the third cell with a pellet-shaped functional material having a particle diameter of 0.025 to 10 mm; A step of forming a first sealing portion and a fourth sealing portion on the inflow end faces of the first cell and the third cell, respectively A method for manufacturing a reactor, including.

21. A gas recovery device for recovering and discharging a gas to be captured contained in a treatment gas, The reactor according to claim 1 or 2, and A gas supply pipe capable of supplying the processing gas or the purge gas to the inlet of the reactor, and a gas discharge pipe capable of discharging the processing gas or the purge gas from the outlet of the reactor constitute a gas recovery device.

22. The gas supply pipe has gas supply branch pipes branched into two, and the gas supply branch pipes are a first gas supply branch pipe capable of supplying the processing gas and a second gas supply branch pipe capable of supplying the purge gas. The gas discharge pipe has gas discharge branch pipes branched into two, and the gas discharge branch pipes are a first gas discharge branch pipe capable of discharging the processing gas and a second gas discharge branch pipe capable of discharging the purge gas. The gas recovery device further includes a supply gas switching valve capable of shutting off the first gas supply branch pipe or the second gas supply branch pipe, and a discharge gas switching valve capable of shutting off the first gas discharge branch pipe or the second gas discharge branch pipe. The gas recovery device according to claim 21.

23. The gas supply pipe has two independent gas supply pipes, and the gas supply pipes are a first gas supply pipe capable of supplying the processing gas and a second gas supply pipe capable of supplying the purge gas. The gas discharge pipe has two independent gas discharge pipes, and the gas discharge pipes are a first gas discharge pipe capable of discharging the processing gas and a second gas discharge pipe capable of discharging the purge gas. The reactor can be arranged between the first gas supply pipe and the first gas discharge pipe or between the second gas supply pipe and the second gas discharge pipe. The gas recovery device further includes a transfer mechanism capable of transferring the reactor between the first gas supply pipe and the first gas discharge pipe or between the second gas supply pipe and the second gas discharge pipe. The gas recovery device according to claim 21.

24. The gas recovery device further includes a heating mechanism capable of heating the reactor. The gas recovery device according to claim 21.

25. A gas recovery system for recovering and releasing a gas to be captured contained in a processing gas, comprising a detachable part capable of attaching and detaching the reactor according to claim 1 or 2, a gas supply pipe capable of supplying the processing gas to the inlet of the reactor, and a gas discharge pipe capable of discharging the processing gas from the outlet of the reactor. A gas recovery device A gas discharge device comprising a detachable portion for detaching and attaching the reactor, a gas supply pipe capable of supplying a purge gas to an inlet of the reactor, and a gas discharge pipe capable of discharging the purge gas from an outlet of the reactor. A transfer device capable of transferring the reactor from which the target gas to be captured has been recovered by the gas recovery device to the gas discharge device, and transferring the reactor from which the target gas to be captured has been discharged by the gas discharge device to the gas recovery device. A gas recovery system comprising the same.

26. The gas recovery system according to claim 25, wherein the transfer device includes a vehicle.