Ammonia recovery material, ammonia detection material, basic copper carbonate composite component, ammonia recovery device, ammonia recovery system, ammonia recovery method, and ammonia detection method.

Abstract

The present invention provides an ammonia recovery material and an ammonia detection material that can reduce the concentration of ammonia in the target gas. [Solution] The ammonia recovery material contains basic copper carbonate, and recovers ammonia by adsorbing ammonia gas or by reacting with ammonia gas. The ammonia detection material contains basic copper carbonate, and recovers ammonia by adsorbing ammonia gas or by reacting with ammonia gas, and detects ammonia.

Description

Technical Field

[0001] The present disclosure relates to an ammonia recovery material, an ammonia detection material, a basic copper carbonate composite member, an ammonia recovery device, an ammonia recovery system, an ammonia recovery method, and an ammonia detection method.

Background Art

[0002] Ammonia does not contain carbon in its molecule and does not produce carbon dioxide even when burned. Therefore, by including ammonia in the fuel, the amount of carbon dioxide emissions into the atmosphere can be reduced. Conventionally, in the case of using a device for handling ammonia, a wet scrubber is known as a device for reducing the concentration of ammonia in the gas generated by ammonia leakage or ammonia purge.

[0003] Patent Document 1 discloses a scrubber device including a casing, a gas supply unit capable of supplying a gas containing ammonia into the casing, and a liquid dispersion unit capable of dispersing an absorption liquid supplied from the outside of the casing from the upper part inside the casing. Examples of the absorption liquid supplied from the outside of the casing include fresh water and seawater.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] A wet scrubber, as described in Patent Document 1, is a water-based recovery system and is relatively easy to introduce into a system. On the other hand, with a wet scrubber, ammonia may be released from the absorbent liquid due to collisions between water droplets in the absorbent liquid. Therefore, a wet scrubber may not be able to sufficiently reduce the concentration of ammonia in the target gas.

[0006] This disclosure aims to provide an ammonia recovery material, an ammonia detection material, a basic copper carbonate composite member, an ammonia recovery device, an ammonia recovery system, an ammonia recovery method, and an ammonia detection method that can reduce the concentration of ammonia in a target gas. [Means for solving the problem]

[0007] The ammonia recovery material relating to this disclosure contains basic copper carbonate, and recovers ammonia by the basic copper carbonate adsorbing ammonia gas or by reacting with ammonia gas.

[0008] The ammonia detection material relating to this disclosure contains basic copper carbonate, and detects ammonia by recovering it through the adsorption of ammonia gas by the basic copper carbonate or by reacting with ammonia gas.

[0009] The basic copper carbonate composite member according to this disclosure comprises an ammonia recovery material containing basic copper carbonate and a carrier supporting the ammonia recovery material, and recovers ammonia by the basic copper carbonate adsorbing ammonia gas or by reacting with ammonia gas.

[0010] The ammonia recovery apparatus according to this disclosure comprises a gas containment section for containing a target gas and an ammonia recovery material disposed within the gas containment section in contact with the target gas. The ammonia recovery material contains basic copper carbonate, and ammonia is recovered by the basic copper carbonate adsorbing ammonia gas or by reacting with ammonia gas.

[0011] The ammonia recovery device may further include a first ammonia concentration meter for measuring the ammonia concentration in the target gas within the gas containment section.

[0012] The gas containment section may contain an absorbent liquid that has been in contact with the target gas and absorbed ammonia.

[0013] The ammonia recovery device may further include a second ammonia concentration meter for measuring the ammonia concentration in the absorption liquid.

[0014] The ammonia recovery system according to this disclosure includes a scrubber that supplies an absorbent liquid for absorbing ammonia in contact with a target gas. The ammonia recovery system includes an ammonia recovery device comprising a gas containment section that contains the target gas in contact with the absorbent liquid in the scrubber, and an ammonia recovery material disposed within the gas containment section in contact with the target gas contained within the gas containment section. The ammonia recovery material contains basic copper carbonate, and ammonia is recovered by the basic copper carbonate adsorbing ammonia gas or by reacting with ammonia gas.

[0015] At least a portion of the absorbent liquid that comes into contact with the target gas in the scrubber may be supplied into the gas containment section. At least a portion of the absorbent liquid that comes into contact with the target gas in the scrubber may come into contact with the target gas within the gas containment section.

[0016] The ammonia recovery method described herein recovers ammonia by adsorbing ammonia gas with basic copper carbonate or by reacting with ammonia gas.

[0017] The ammonia detection method described herein involves detecting ammonia by recovering it through the adsorption of ammonia gas by basic copper carbonate or by its reaction with ammonia gas. [Effects of the Invention]

[0018] According to the present disclosure, it is possible to provide an ammonia recovery material, an ammonia detection material, a basic copper carbonate composite member, an ammonia recovery device, an ammonia recovery system, an ammonia recovery method, and an ammonia detection method capable of reducing the concentration of ammonia in a target gas.

Brief Description of the Drawings

[0019] [Figure 1] It is a schematic diagram showing an ammonia recovery device according to an embodiment. [Figure 2] It is a schematic diagram showing an ammonia recovery system according to an embodiment. [Figure 3] It is a schematic diagram showing the state of an exposure test. [Figure 4] It is a graph showing the relationship between the exposure time and the mass increase rate of basic copper carbonate (Cu2CO3(OH)2), α-zirconium phosphate (α-ZrP), and α-titanium phosphate (α-TiP) exposed in a sealed space where aqueous ammonia is placed. [Figure 5] It is a graph showing the relationship between the exposure time and the mass increase rate of basic copper carbonate, basic cobalt carbonate, basic zinc carbonate, basic nickel carbonate, and basic magnesium carbonate exposed in a sealed space where aqueous ammonia is placed. [Figure 6] It is a graph showing the relationship between the exposure time and the mass increase rate of basic copper carbonate, basic cobalt carbonate, basic zinc carbonate, basic nickel carbonate, and basic magnesium carbonate exposed in a sealed space where water is placed. [Figure 7] It is a figure showing a graph showing the relationship between the exposure time and the mass increase rate of basic copper carbonate exposed in a sealed space where aqueous ammonia is placed, together with an external appearance photograph of basic copper carbonate. [Figure 8] It is a powder X-ray diffraction pattern of basic copper carbonate exposed for 0 hours, 1 hour, 3 hours, 6 hours, 10 hours, and 24 hours in a sealed space where aqueous ammonia is placed. [Figure 9] It is an IR (infrared spectroscopy) spectrum of basic copper carbonate exposed for 0 hours and 24 hours in a sealed space where aqueous ammonia is placed. [Figure 10]This is a diagram showing the results of observing basic copper carbonate exposed for 0 hours in a sealed space containing aqueous ammonia using SEM-EDX (scanning electron microscope - energy dispersive X-ray analysis). [Figure 11] This is a diagram showing the results of observing basic copper carbonate exposed for 6 hours in a sealed space containing aqueous ammonia using SEM-EDX. [Figure 12] This is a diagram showing the results of observing basic copper carbonate exposed for 12 hours in a sealed space containing aqueous ammonia using SEM-EDX. [Figure 13] This is a diagram showing the results of observing basic copper carbonate exposed for 24 hours in a sealed space containing aqueous ammonia using SEM-EDX. [Figure 14] This is a diagram showing the results of analyzing basic copper carbonate exposed for 0 hours and 24 hours in a sealed space containing aqueous ammonia using TG-DTA (thermogravimetric measurement - differential thermal analysis).

Embodiments for Carrying Out the Invention

[0020] Hereinafter, several exemplary embodiments will be described with reference to the drawings. Note that the dimensional ratios in the drawings are exaggerated for the convenience of explanation and may be different from the actual ratios.

[0021] [Ammonia Recovery Material and Ammonia Recovery Method] First, the ammonia recovery material and ammonia recovery method according to this embodiment will be described.

[0022] The ammonia recovery material contains basic copper carbonate (CuCO3·Cu(OH)2). And the ammonia recovery material recovers ammonia by the basic copper carbonate adsorbing ammonia gas or reacting with ammonia gas. Also, the ammonia recovery method recovers ammonia by the basic copper carbonate adsorbing ammonia gas or reacting with ammonia gas.

[0023] As described later, basic copper carbonate adsorbs ammonia gas in an ammonia-containing gas atmosphere. Furthermore, basic copper carbonate recovers ammonia by reacting with ammonia gas in an ammonia-containing gas atmosphere. Therefore, ammonia can be recovered using basic copper carbonate.

[0024] The ammonia recovery material may be, for example, a powder containing multiple particles containing basic copper carbonate, a compound of multiple particles, or a combination thereof. The shape of the basic copper carbonate particles is not particularly limited and may be at least one shape selected from the group consisting of needle-shaped, horn-shaped, dendritic, fibrous, flake-shaped, irregular, teardrop-shaped, and spherical. The shape of the compound is not particularly limited and may be sheet-shaped, rod-shaped, spherical, prismatic, spherical, cylindrical, irregular, or a combination thereof.

[0025] The ammonia recovery material may contain 50% or more by mass of basic copper carbonate, 60% or more by mass, 70% or more by mass, 80% or more by mass, 90% or more by mass, 95% or more by mass, or 99% or more by mass.

[0026] [Ammonia detection material and ammonia detection method] Next, the ammonia detection material and ammonia detection method according to this embodiment will be described. The ammonia detection material according to this embodiment contains basic copper carbonate (CuCO3·Cu(OH)2). Ammonia is detected by the basic copper carbonate adsorbing ammonia gas or by reacting with ammonia gas. The ammonia detection method according to this embodiment detects ammonia by the basic copper carbonate adsorbing ammonia gas or by reacting with ammonia gas.

[0027] As described later, basic copper carbonate adsorbs ammonia gas in an ammonia-containing gas atmosphere and changes color from green to blue. Furthermore, basic copper carbonate changes color from green to blue by reacting with ammonia gas in an ammonia-containing gas atmosphere. Therefore, ammonia can be detected by the degree of discoloration of basic copper carbonate. The discoloration of basic copper carbonate increases with exposure time in an ammonia-containing gas atmosphere. Therefore, it is easy to determine when to replace the ammonia detection material.

[0028] The ammonia detection material may be, for example, a powder containing multiple particles containing basic copper carbonate, a compound of multiple particles, or a combination thereof. The shape of the basic copper carbonate particles is not particularly limited and may be at least one shape selected from the group consisting of needle-shaped, horn-shaped, dendritic, fibrous, flake-shaped, irregular, teardrop-shaped, and spherical. The shape of the compound is not particularly limited and may be sheet-shaped, rod-shaped, spherical, prismatic, spherical, cylindrical, irregular, or a combination thereof.

[0029] The ammonia detection material may contain 50% or more by mass of basic copper carbonate, 60% or more by mass, 70% or more by mass, 80% or more by mass, 90% or more by mass, 95% or more by mass, or 99% or more by mass.

[0030] Furthermore, the ammonia recovery material contains basic copper carbonate, and recovers ammonia by adsorbing ammonia gas or by reacting with ammonia gas. Similarly, the ammonia detection material contains basic copper carbonate, and detects ammonia by adsorbing ammonia gas or by reacting with ammonia gas. Therefore, the ammonia recovery material may also be an ammonia detection material that detects ammonia. Specifically, the ammonia recovery material may detect ammonia by adsorbing ammonia gas or by reacting with ammonia gas using basic copper carbonate. Likewise, the ammonia detection material may also be an ammonia recovery material. Specifically, the ammonia detection material may recover ammonia by adsorbing ammonia gas or by reacting with ammonia gas using basic copper carbonate. Therefore, the ammonia detection material may contain basic copper carbonate, and recover and detect ammonia by adsorbing ammonia gas or by reacting with ammonia gas using basic copper carbonate.

[0031] [Basic copper carbonate composite material] Next, the basic copper carbonate composite member according to this embodiment will be described. The basic copper carbonate composite member comprises an ammonia recovery material containing basic copper carbonate and a carrier that supports the ammonia recovery material. Ammonia is recovered by the basic copper carbonate adsorbing ammonia gas or by reacting with ammonia gas. In the basic copper carbonate composite member according to this embodiment, the ammonia recovery material is supported on the carrier, making it easy to handle.

[0032] The shape of the carrier is not particularly limited and may be sheet-like, rod-like, spherical, prismatic, cylindrical, irregular, or a combination thereof. The carrier may be, for example, woven fabric, nonwoven fabric, or a combination thereof. The material of the carrier is not particularly limited but may include at least one selected from the group consisting of cellulose, glass, plastic, carbon, metal, ceramics, and wood.

[0033] The basic copper carbonate composite member may be, for example, a filter comprising an ammonia recovery material containing basic copper carbonate and a carrier that supports the ammonia recovery material and includes a woven or non-woven fabric. By installing such a basic copper carbonate composite member in an exhaust channel through which ammonia-containing gas is discharged, the basic copper carbonate composite member can remove ammonia from the exhaust gas.

[0034] The method for manufacturing basic copper carbonate composite members is not particularly limited and can be manufactured by known methods. For example, a basic copper carbonate composite member can be manufactured by impregnating a carrier in a liquid in which basic copper carbonate is dispersed, and then removing the carrier from the liquid and drying it.

[0035] As mentioned above, the ammonia recovery material may also be an ammonia detection material, and the ammonia detection material may also be an ammonia recovery material. Therefore, the basic copper carbonate composite member may comprise an ammonia detection material containing basic copper carbonate and a carrier supporting the ammonia detection material. Furthermore, ammonia may be detected by the basic copper carbonate adsorbing ammonia gas or by reacting with ammonia gas.

[0036] [Ammonia recovery system] Next, the ammonia recovery device 1 according to this embodiment will be described with reference to Figure 1. As shown in Figure 1, the ammonia recovery device 1 according to this embodiment comprises a gas containment section 10 and an ammonia recovery material 20. The ammonia recovery device 1 may also include a first ammonia concentration meter 30.

[0037] The gas containment section 10 contains the target gas G. The gas containment section 10 may be a tank, a vessel, or a sealed container. The target gas G may contain ammonia gas.

[0038] The ammonia recovery material 20 is placed inside the gas containment section 10 so as to be in contact with the target gas G. As described above, the ammonia recovery material 20 contains basic copper carbonate. Ammonia is recovered by the basic copper carbonate adsorbing the ammonia gas or by reacting with the ammonia gas.

[0039] The first ammonia concentration meter 30 measures the ammonia concentration in the target gas G within the gas containment section 10. By measuring the ammonia concentration in the target gas G, it is possible to discharge the target gas G to the outside of the gas containment section 10 only after confirming that the ammonia concentration in the target gas G has decreased sufficiently. However, if a predetermined time is to be waited until the ammonia concentration in the target gas G has sufficiently decreased before discharging the target gas G to the outside of the gas containment section 10, it is not necessary to measure the ammonia concentration in the target gas G.

[0040] The ammonia recovery device 1 may be a batch type. By recovering ammonia from the target gas in this manner, the ammonia concentration in the target gas G can be further reduced by the ammonia recovery material 20.

[0041] As described above, the ammonia recovery device 1 comprises a gas containment section 10 for containing the target gas G, and an ammonia recovery material 20 arranged inside the gas containment section 10 in contact with the target gas G. The ammonia recovery material 20 contains basic copper carbonate. Ammonia is recovered by the basic copper carbonate adsorbing the ammonia gas or by reacting with the ammonia gas.

[0042] When the target gas G contained in the gas containment section 10 comes into contact with the ammonia recovery material 20, the basic copper carbonate in the ammonia recovery material 20 recovers the ammonia gas from the target gas G. Therefore, the ammonia recovery device 1 according to this embodiment can reduce the concentration of ammonia in the target gas G. In addition, the ammonia recovery device 1 according to this embodiment can be made smaller in size compared to a scrubber 110 or the like which will be described later.

[0043] [Ammonia Recovery System] Next, the ammonia recovery system 100 according to this embodiment will be described with reference to Figure 2. As shown in Figure 2, the ammonia recovery system 100 according to this embodiment comprises a scrubber 110 and an ammonia recovery device 1.

[0044] The scrubber 110 removes ammonia contained in the target gas G. The scrubber 110 supplies an absorbent liquid L that absorbs ammonia to the target gas G in contact with it. In this embodiment, the scrubber 110 is a wet scrubber and includes a tank 111 and a packing material 112.

[0045] Tank 111 contains packing material 112. A target gas supply line 113 is connected to tank 111 to supply target gas G into tank 111. The target gas supply line 113 is connected to the tank 111 below the packing material 112. The target gas G is supplied into tank 111 from below the packing material 112 through the target gas supply line 113. The target gas G supplied into tank 111 rises from bottom to top and passes through the packing material 112. The target gas G that has passed through the packing material 112 is discharged from the target gas outlet 114.

[0046] An absorbent liquid supply line 115 is connected to the tank 111 to supply absorbent liquid L into the tank 111. The absorbent liquid supply line 115 is connected above the packing material 112 of the tank 111. A pump P1 is provided in the absorbent liquid supply line 115. The absorbent liquid L is supplied to the tank 111 from above the packing material 112 through the absorbent liquid supply line 115 by the pump P1. The absorbent liquid L supplied into the tank 111 passes through the packing material 112 from top to bottom.

[0047] The absorbent liquid L is not particularly limited as long as it can absorb ammonia gas. The absorbent liquid L may be, for example, a liquid containing water. The absorbent liquid L may contain tap water, fresh water, or seawater.

[0048] In the packing material 112, the target gas G passing through the packing material 112 from bottom to top comes into gas-liquid contact with the absorbent liquid L passing through the packing material 112 from top to bottom. In the tank 111, the target gas G is absorbed by the absorbent liquid L through gas-liquid contact with the absorbent liquid L, and an absorbent liquid L that has absorbed ammonia is generated. The absorbent liquid L that has passed through the packing material 112 remains at the bottom of the tank 111.

[0049] Tank 111 is connected to a gas line 116 and a liquid line 117. A pump P2 is provided in the liquid line 117. The target gas G, whose ammonia concentration has decreased after contact with the absorbent liquid L in the scrubber 110, is supplied to the ammonia recovery device 1 through the gas line 116. The absorbent liquid L, which has absorbed ammonia after contact with the target gas G in the scrubber 110, is supplied to the ammonia recovery device 1 through the liquid line 117 by the pump P2.

[0050] As described above, the ammonia recovery device 1 comprises a gas containment section 10 and an ammonia recovery material 20. The ammonia recovery device 1 may also include a first ammonia concentration meter 30 and a second ammonia concentration meter 40.

[0051] A gas line 116 is connected to the gas containment section 10. The target gas G is supplied into the gas containment section 10 from the scrubber 110 through the gas line 116. A liquid line 117 is also connected to the gas containment section 10. The absorbent liquid L is supplied into the gas containment section 10 from the scrubber 110 through the liquid line 117.

[0052] The gas containment section 10 contains the target gas G that has come into contact with the absorbent liquid L in the scrubber 110. The ammonia recovery material 20 is positioned inside the gas containment section 10 so as to be in contact with the target gas G contained within the gas containment section 10. The ammonia recovery material 20 contains basic copper carbonate, and the basic copper carbonate recovers ammonia gas by adsorbing it or by reacting with the ammonia gas. Therefore, the ammonia recovery material 20 recovers the ammonia contained in the target gas G. The target gas G, with its ammonia concentration reduced, is discharged from the gas containment section 10.

[0053] In this embodiment, a mounting platform 25 is placed inside the gas containment section 10, and the ammonia recovery material 20 is placed on the mounting platform 25. However, the embodiment is not limited to this configuration, and the ammonia recovery material 20 may be housed in an open container inside the gas containment section 10 so as not to come into contact with the absorbent liquid L.

[0054] The gas containment section 10 contains an absorbent liquid L that has come into contact with the target gas G in the scrubber 110 and absorbed ammonia. Specifically, the absorbent liquid L that has absorbed ammonia in the scrubber 110 is supplied to the gas containment section 10. The absorbent liquid L that has absorbed ammonia then comes into contact with the target gas G contained in the gas containment section 10. As a result, the ammonia in the absorbent liquid L is released into the target gas G, and the ammonia gas released into the target gas G is recovered by the ammonia recovery material 20. Therefore, in such an ammonia recovery device 1, the concentration of ammonia contained in the absorbent liquid L can be reduced. The absorbent liquid L with reduced ammonia concentration in the gas containment section 10 is discharged from the gas containment section 10.

[0055] The second ammonia concentration meter 40 measures the ammonia concentration in the absorbent liquid. By measuring the ammonia concentration in the absorbent liquid L in the gas containment section 10, the absorbent liquid L can be discharged to the outside of the gas containment section 10 only after confirming that the ammonia concentration in the absorbent liquid L has decreased. However, if a predetermined time is waited until the ammonia concentration in the absorbent liquid L has sufficiently decreased before discharging the absorbent liquid L to the outside of the gas containment section 10, it is not necessary to measure the ammonia concentration in the absorbent liquid L.

[0056] As described above, the ammonia recovery system 100 according to this embodiment includes a scrubber 110 that supplies an absorbent liquid L for absorbing ammonia so as to come into contact with the target gas G. The ammonia recovery system 100 includes an ammonia recovery device 1 which comprises a gas containment section 10 that contains the target gas G in contact with the absorbent liquid L in the scrubber 110, and an ammonia recovery material 20 that is placed inside the gas containment section 10 so as to come into contact with the target gas G contained inside the gas containment section 10. The ammonia recovery material 20 contains basic copper carbonate. The ammonia is recovered by the basic copper carbonate adsorbing the ammonia gas or by reacting with the ammonia gas.

[0057] According to the ammonia recovery system 100 of this embodiment, ammonia contained in the target gas G can be absorbed by the absorbent liquid L in the scrubber 110. However, in the scrubber 110, the absorbent liquid L that has absorbed ammonia turns into water droplets, and the ammonia absorbed by the absorbent liquid L may be released when these water droplets collide with each other. Therefore, even if multiple scrubbers 110 are simply arranged in series, there are limitations to reducing the ammonia concentration of the treated gas to below a predetermined concentration. On the other hand, in the ammonia recovery system 100 of this embodiment, ammonia that could not be recovered by the scrubber 110 can be recovered by the ammonia recovery device 1. Therefore, the ammonia concentration in the target gas G can be further reduced.

[0058] At least a portion of the absorbent liquid L that comes into contact with the target gas G in the scrubber 110 may be supplied into the gas containment section 10. At least a portion of the absorbent liquid L that comes into contact with the target gas G in the scrubber 110 may also come into contact with the target gas G in the gas containment section 10. With this configuration, ammonia in the absorbent liquid L is recovered by the ammonia recovery material 20 via the target gas G in the gas containment section 10. Therefore, according to the ammonia recovery system 100 of this embodiment, not only can ammonia in the target gas G be recovered, but ammonia in the absorbent liquid L discharged from the scrubber 110 can also be recovered.

[0059] Furthermore, the ammonia recovery system 100 according to this embodiment includes a scrubber 110 and supplies the absorbent liquid L discharged from the scrubber 110. However, the absorbent liquid L supplied to the ammonia recovery device 1 is not limited to the absorbent liquid L discharged from the scrubber 110.

[0060] In this embodiment, one ammonia recovery device 1 is located downstream of the scrubber 110. However, multiple ammonia recovery devices 1 may be arranged in series. This allows for more reliable ammonia recovery.

[0061] Furthermore, multiple ammonia recovery devices 1 may be arranged in parallel. This allows the ammonia recovery devices 1 to sufficiently recover ammonia even when a large amount of target gas G is discharged from the scrubber 110. For example, a portion of the absorbent liquid L that comes into contact with the target gas G in the scrubber 110 may be supplied into the gas containment section 10. And a portion of the absorbent liquid L that comes into contact with the target gas G in the scrubber 110 may come into contact with the target gas G within the gas containment section 10.

[0062] Ammonia recovery materials, ammonia detection materials, basic copper carbonate composite components, ammonia recovery devices, ammonia recovery systems, ammonia recovery methods, and ammonia detection methods can be used for ammonia detoxification in ammonia storage facilities or ammonia utilization facilities. [Examples]

[0063] The embodiments will be described in more detail below, but the embodiments are not limited to these examples.

[0064] Exposure tests were conducted to screen for inorganic compounds with high ammonia gas adsorption performance. Specifically, as shown in Figure 3, a beaker 225 containing inorganic compound powder 220 was placed inside a sealed container 210 containing 28% by mass aqueous ammonia as liquid La, and the container was sealed. The inorganic compound powder 220 was exposed in the sealed space containing the liquid La after the sealed container 210 was closed. The mass increase rate of the inorganic compound was calculated by measuring the mass of beaker 225 at predetermined time intervals after the sealed container 210 was closed. Figure 4 shows a graph illustrating the relationship between exposure time and mass increase rate for basic copper carbonate (Cu2CO3(OH)2: Wako Pure Chemical Industries, Ltd., product name: basic copper carbonate), α-zirconium phosphate (α-ZrP: Toagosei Co., Ltd., product name: IXE-100), and α-titanium phosphate (α-TiP: homemade). Furthermore, Figure 5 shows a graph illustrating the relationship between exposure time and mass increase rate for basic copper carbonate, basic cobalt carbonate (Kanto Chemical Co., Ltd., product name: Cobalt(II) carbonate (basic)), basic zinc carbonate (Wako Pure Chemical Industries, Ltd., product name: Basic zinc carbonate), basic nickel carbonate (Kanto Chemical Co., Ltd., product name: Nickel carbonate (basic)), and basic magnesium carbonate (Kanto Chemical Co., Ltd., product name: Magnesium carbonate hydroxide).

[0065] As shown in Figure 4, the mass increase rate of basic copper carbonate was found to be lower than that of α-zirconium phosphate and α-titanium phosphate up to 60 minutes of exposure, but increased after 120 minutes. Furthermore, as shown in Figure 5, the mass increase rate of basic copper carbonate was found to be higher than that of basic cobalt carbonate, basic zinc carbonate, basic nickel carbonate, and basic magnesium carbonate, reaching over 50% by mass at 1300 minutes.

[0066] Next, we confirmed whether the mass increase of the inorganic compound powder in the exposure test was due to moisture absorption by water. Specifically, the exposure test was conducted in the same manner as above, except that water was used as the liquid La. Figure 6 shows a graph illustrating the relationship between exposure time and mass increase rate for basic copper carbonate, basic cobalt carbonate, basic zinc carbonate, basic nickel carbonate, and basic magnesium carbonate.

[0067] As shown in Figure 6, the mass increase rate of basic copper carbonate in the space containing water was 5% by mass in 1300 minutes. As shown in Figure 5, the mass increase rate of basic copper carbonate in the space containing ammonia water was 50% by mass or more in 1300 minutes, suggesting that the mass increase of basic copper carbonate was due to ammonia.

[0068] The results shown in Figures 4 to 6 indicate that basic copper carbonate functions as an ammonia recovery material for recovering ammonia.

[0069] Figure 7 shows the results of the exposure test of basic copper carbonate with ammonia water, along with a photograph of the appearance of the basic copper carbonate. As shown in Figure 7, in a space exposed to ammonia water, the color of the basic copper carbonate changed from light green to dark blue in accordance with the rate of mass increase. From Figures 5 and 6, it is considered that most of the mass increase of basic copper carbonate is due to ammonia, indicating that basic copper carbonate can be used as an ammonia detection material in which the degree of ammonia recovery can be grasped by the change in color.

[0070] Next, in the above exposure test, basic copper carbonate exposed to ammonia water in a sealed space for 0 hours, 1 hour, 3 hours, 6 hours, 10 hours, and 24 hours was analyzed using a powder X-ray diffractometer. As shown in Figure 8, no significant change in the powder X-ray diffraction pattern was observed up to 3 hours. On the other hand, after 3 hours, the powder X-ray diffraction pattern of basic copper carbonate changed significantly. The change in the powder X-ray diffraction pattern is thought to be the result of ammonia being incorporated into the basic copper carbonate by a chemical reaction, and the crystal structure of the basic copper carbonate changing. From these results, it is thought that in the initial stages of exposure, ammonia adsorption is dominant in basic copper carbonate, and after a predetermined time, chemical reaction with ammonia becomes dominant.

[0071] Next, in the above exposure test, basic copper carbonate exposed to ammonia water in a sealed space for 0 hours and 24 hours was measured by IR (infrared spectroscopy). The resulting IR spectra are shown in Figure 9. As shown in Figure 9, the IR spectrum of basic copper carbonate exposed to an ammonia atmosphere for 24 hours did not show a clear presence of NH3. This result also suggests that basic copper carbonate chemically reacts with ammonia when exposed to an ammonia atmosphere for 24 hours.

[0072] Next, basic copper carbonate exposed to ammonia water in a sealed space for 0, 6, 12, and 24 hours was observed using SEM-EDX (Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy). These SEM images, along with the EDX analysis results, are shown in Figures 10, 11, 12, and 13, respectively. As shown in Figures 10 to 13, the EDX analysis results confirmed that the atomic amount of nitrogen increased from 1.44 atomic%, 3.40 atomic%, 3.96 atomic%, and 8.44 atomic%, respectively, as the exposure time increased from 0, 6, 12, and 24 hours. Furthermore, the SEM images showed that the shape of the needle-shaped particles changed as the exposure time increased. This result suggests that a chemical reaction between basic copper carbonate and ammonia is progressing with increasing exposure time.

[0073] Next, in the above exposure test, basic copper carbonate exposed to ammonia water in a sealed space for 0 hours and 24 hours was analyzed by TG-DTA (thermogravimetric analysis-differential thermal analysis). The DTA results are shown in the upper part of Figure 14, and the TG results are shown in the lower part of Figure 14. As shown in Figure 14, a mass loss of approximately 18 mass% was observed when the basic copper carbonate exposed for 24 hours was heated to 100°C. This mass loss is presumed to be due to water. Furthermore, a mass loss of 27.1 mass% was observed when the basic copper carbonate exposed for 24 hours was heated from 100°C to 300°C. This mass loss is presumed to be due to ammonia. In addition, almost no mass loss occurred when the basic copper carbonate exposed for 24 hours was heated above 300°C. It is known that when basic copper carbonate is heated, it decomposes into carbon dioxide, water, and copper oxide, as shown in the following reaction equation (1).

[0074] Cu2CO3(OH)2→CO2+H2O+2CuO (1)

[0075] Therefore, when basic copper carbonate exposed for 24 hours was heated to over 300°C, it is presumed that the basic copper carbonate was converted to copper oxide, as shown in reaction equation (1). Furthermore, since an exothermic peak is observed in DTA at around 300°C, it is thought that ammonia is burning.

[0076] Since the typical desorption temperature for gases adsorbed on inorganic compounds is below 200°C, the results in Figure 14 suggest that a chemical reaction is occurring between basic copper carbonate and ammonia. Based on the mass loss rates up to 100°C, from 100°C to 300°C, and above 300°C, it is presumed that basic copper carbonate exposed to an ammonia-water configuration for 24 hours undergoes a chemical transformation into a reactant such as CuO·2,3NH3·1,5H2O.

[0077] Although several embodiments have been described, it is possible to modify or transform the embodiments based on the above disclosure. All components of the above embodiments, and all features described in the claims, may be taken individually and combined, provided that they do not conflict with each other.

[0078] This disclosure can contribute, for example, to United Nations Sustainable Development Goal (SDG) 7, "Ensure access to affordable, reliable, sustainable, and modern energy for all," and Goal 13, "Take urgent action to combat climate change and its impacts." [Explanation of symbols]

[0079] 1. Ammonia recovery device 10 Gas containment section 20 Ammonia recovery material 30. First Ammonia Concentration Meter 40. Second Ammonia Concentration Meter 100 Ammonia Recovery System 110 Scrubber G Target gas L Absorbent Solution

Claims

1. Contains basic copper carbonate, An ammonia recovery material that recovers ammonia by adsorbing ammonia gas with the basic copper carbonate or by reacting with the ammonia gas.

2. Contains basic copper carbonate, An ammonia detection material that detects ammonia by recovering it through the adsorption of ammonia gas by the basic copper carbonate or by its reaction with the ammonia gas.

3. Ammonia recovery material containing basic copper carbonate, A carrier supporting the ammonia recovery material, Equipped with, A basic copper carbonate composite member that recovers ammonia by adsorbing ammonia gas or by reacting with ammonia gas.

4. A gas containment section for containing the target gas, An ammonia recovery material is placed in the gas containment section so as to be in contact with the target gas, Equipped with, The ammonia recovery material contains basic copper carbonate. An ammonia recovery apparatus that recovers ammonia by adsorbing ammonia gas with the basic copper carbonate or by reacting with the ammonia gas.

5. The ammonia recovery apparatus according to claim 4, further comprising a first ammonia concentration meter for measuring the ammonia concentration in the target gas within the gas containment section.

6. The ammonia recovery apparatus according to claim 4 or 5, wherein the gas containment section contains an absorbent liquid that has come into contact with the target gas and absorbed ammonia.

7. The ammonia recovery apparatus according to claim 6, further comprising a second ammonia concentration meter for measuring the ammonia concentration in the absorbent liquid.

8. A scrubber that supplies an ammonia-absorbing solution so that it comes into contact with the target gas, An ammonia recovery apparatus comprising a scrubber, a gas containment section for containing the target gas in contact with the absorbent liquid, and an ammonia recovery material disposed within the gas containment section so as to be in contact with the target gas contained within the gas containment section, Equipped with, The ammonia recovery material contains basic copper carbonate. An ammonia recovery system in which ammonia is recovered by the adsorption of ammonia gas by the basic copper carbonate or by reaction with the ammonia gas.

9. At least a portion of the absorbent liquid that comes into contact with the target gas in the scrubber is supplied into the gas containment section. The ammonia recovery system according to claim 8, wherein at least a portion of the absorbent liquid that comes into contact with the target gas in the scrubber comes into contact with the target gas within the gas containment section.

10. A method for recovering ammonia, wherein basic copper carbonate recovers ammonia by adsorbing ammonia gas or by reacting with the ammonia gas.

11. A method for detecting ammonia, comprising recovering ammonia by adsorbing ammonia gas with basic copper carbonate or by reacting with the ammonia gas, and detecting the presence of ammonia.

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