JP2024021501A - Manufacturing apparatus, manufacturing system and manufacturing method of acid component capturing liquid and recovery method of acid component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a method and the like which efficiently capture an acid component from acid gas.

SOLUTION: There is provided a manufacturing apparatus (1) of acid component capturing liquid in which a plurality of manufacturing units are connected. When the two continuous manufacturing units are respectively a first manufacturing unit (10) and a second manufacturing unit (20), each manufacturing unit includes: gas supply lines (11, 21) of acid gas; liquid supply lines (12, 22) of capturing liquid which captures acid components; contact lines (14, 24) which bring the acid gas into contact with the capturing liquid to obtain the acid component capturing liquid; and separation devices (15, 25) which separate the acid gas from the acid component capturing liquid. The contact line (14) is connected to the liquid supply line (22) via the separation device (15). The acid component capturing liquid separated from the first manufacturing unit (10) is supplied to the liquid supply line (22) as the capturing liquid.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a manufacturing device, a manufacturing system, a manufacturing method, and a method for recovering acid components of an acid component capturing liquid.

In recent years, the emission of greenhouse gases such as carbon dioxide has become a social issue. Therefore, there is a need for technology to recover carbon dioxide from industrially generated exhaust gas and the like.

For example, Patent Document 1 discloses that carbon dioxide contained in the gas to be absorbed is moved inside and outside of the absorption liquid within the microchannels, and the absorption solution after being separated from the treated gas is passed through the recirculation line to each microchannel. A component transfer treatment method is disclosed that includes a circulation step back to the inlet of the component.

International Publication No. 2016/017459

The method described in Patent Document 1 is a method in which carbon dioxide is absorbed into an absorption liquid in multiple stages by recirculation. In this case, in order to efficiently capture acid components such as carbon dioxide in the capture liquid, the combination of the concentration of acid components contained in the acidic gas and the concentration of acid components already captured by the capture liquid must be adjusted at each processing stage. It is preferable to optimize.

However, in the method described in Patent Document 1, the treated gas and the separated absorption liquid are returned to the entrance of the microchannel and recirculated. In this method, it is difficult to change the concentration of carbon dioxide contained in the absorbed gas introduced at the entrance of the microchannel according to the concentration of carbon dioxide in the absorption liquid at each stage, so the absorption efficiency is difficult to optimize.

One aspect of the present invention aims to realize a method of efficiently capturing acid components from acidic gas without circulating an acid component capturing liquid.

A manufacturing apparatus according to one aspect of the present invention is an acid component scavenging liquid manufacturing apparatus in which a plurality of manufacturing units are connected, and two consecutive manufacturing units among the plurality of manufacturing units are connected to a first manufacturing unit. unit and a second manufacturing unit, each of the first manufacturing unit and the second manufacturing unit includes a gas supply line that supplies acidic gas, and a scavenger that captures acid components contained in the acidic gas. A liquid supply line that supplies a capture liquid, the acidic gas supplied from the gas supply line, and the capture liquid supplied from the liquid supply line are brought into contact with each other through flow, and an acid component containing the acid component is produced. a contact line for obtaining a capture liquid; and a separation device that separates the acidic gas that has passed through the contact line and has come into contact with the capture liquid from the acid component capture liquid, and The contact line and the liquid supply line of the second manufacturing unit are connected via the separation device of the first manufacturing unit, and the acid separated by the separation device of the first manufacturing unit is connected to the liquid supply line of the second manufacturing unit. A component capture liquid is supplied to the liquid supply line as the capture liquid in the second manufacturing unit.

A manufacturing system according to one aspect of the present invention is a manufacturing system including a plurality of the manufacturing devices described above, wherein the plurality of manufacturing devices are connected to each other, and two consecutive manufacturing devices among them are connected to a first manufacturing device, respectively. and a second manufacturing device, the acidic gas separated from the acid component capturing liquid by the separation device included in at least one of the manufacturing units included in the first manufacturing device is used in at least one of the manufacturing units provided in the second manufacturing device. It is supplied to the gas supply line that the unit has.

A manufacturing method according to one aspect of the present invention is a manufacturing method for manufacturing the acid component scavenging liquid using the manufacturing apparatus, wherein the scavenging liquid and the acidic gas are brought into contact with each other in the first manufacturing unit. a first trapping step of obtaining a first acid component trapping liquid, supplying the first acid component trapping liquid and the acidic gas to the second manufacturing unit, and bringing the first acid component trapping liquid and the acidic gas into contact with each other; and a second capturing step of obtaining a second acid component capturing liquid.

The acid component recovery method according to one aspect of the present invention includes an acquisition step of obtaining the second acid component capture liquid produced by the production method, and a recovery step of separating the acid component from the second acid component capture liquid. process.

According to one aspect of the present invention, it is possible to realize a method of efficiently capturing acid components from acidic gas without circulating an acid component capture liquid.

1 is a schematic diagram showing a manufacturing apparatus according to an embodiment of the present invention. FIG. 3 is a schematic diagram showing a slag flow flowing through a contact line included in the manufacturing apparatus. FIG. 3 is a schematic diagram showing a separation device included in the manufacturing device. 1 is a schematic diagram showing a manufacturing system according to an embodiment of the present invention. It is a figure showing the amount of carbon dioxide capture and carbon dioxide capture efficiency concerning one example of the present invention. FIG. 7 is a diagram showing the relationship between the amount of carbon dioxide captured and the capture reaction time according to a comparative example.

〔Manufacturing equipment〕
An embodiment of the present invention will be described below. As shown in FIG. 1, a manufacturing apparatus 1 according to the present embodiment is an acid component trapping liquid manufacturing apparatus 1 in which a plurality of manufacturing units are connected. The manufacturing apparatus 1 separates the acid component from the acidic gas by bringing an acidic gas containing an acid component into contact with a capture liquid containing a scavenger that captures the acid component, and capturing the acid component in the capture liquid.

(acid component)
Examples of acid components include carbon dioxide, carbon monoxide, dinitrogen monoxide, hydrogen chloride, hydrogen sulfide, sulfur oxides (SOx), and hydrogen fluoride. Among them, carbon dioxide has a large amount of industrial emissions and is a social problem as a greenhouse gas, so there is a strong social demand for a method to separate it from exhaust gas, etc. It is suitable as The acidic gas containing an acid component is not particularly limited as long as it is a gas containing such an acid component.

(Capturing liquid)
The scavenger contained in the capture liquid is a component that has the function of capturing an acid component in the capture liquid. Examples of the scavenger include organic amine compounds and adsorbents for acid components. Examples of organic amine compounds include primary amines, secondary amines, and tertiary amines.

Examples of primary amines include primary amines having a heterocycle such as 2-methylpiperidine; primary alkanolamines such as monomethanolamine, monoethanolamine, monopropanolamine, and monobutanolamine. .

Examples of secondary amines include secondary alkanolamines such as 2-methylaminoethanol, 2-ethylaminoethanol, 2-isopropylaminoethanol, and 2-n-butylaminoethanol; piperazine, 2-methylpiperazine, 2, Examples include secondary amines having a heterocycle such as 5-dimethylpiperazine and 2-piperidinoethanol.

Examples of tertiary amines include methyldiethanolamine, diethylaminopropanol, diethylaminoethanol, dimethylaminoethanol, dimethylaminomethylpropanol, N-ethyl-N-methylethanolamine, 3-(dimethylamino)propanol, 4-(dimethylamino) Tertiary alkanolamines such as butanol, 4-(diethylamino)butanol, 2-(2-diethylaminoethoxy)ethanol, and 2-(2-dimethylaminoethoxy)ethanol; 1-methyl-2-piperidinemethanol, 1- Examples include tertiary amines having a heterocycle such as ethyl-3-piperidine methanol and 1-(2-hydroxyethyl)piperidine.

Examples of adsorbents for acid components include inorganic porous agents such as zeolites, metal organic frameworks (MOFs), and covalent organic frameworks (COFs).

The capture liquid may be a solution or dispersion of such a capture agent. The scavenger contained in the scavenger liquid may contain two or more types of organic amine compounds, or may contain two or more types of adsorbents for acid components. Further, the scavenger may contain both an organic amine compound and an adsorbent for acid components. In the capture liquid, the solvent for dissolving or dispersing the capture agent may be, for example, water or a mixed solvent of water and an ether-based organic solvent. Examples of the ether organic solvent include 2-propanol, bis(2-ethoxyethyl)ether diethyl carbitol, and bis[2-(2-methoxyethoxy)ethyl]ether.

The concentration of the capture agent in the capture liquid is not particularly limited. For example, when the scavenger is a solution of an organic amine compound, etc., the concentration of the scavenger in the scavenger liquid is preferably 10% by mass or more from the viewpoint of the amount of acid component absorbed, the rate of absorption, the amount of desorption, the rate of desorption, etc. . On the other hand, from the viewpoint of the solubility of the scavenger and the viscosity of the scavenger liquid, the concentration of the scavenger is preferably 70% by mass or less.

In this embodiment, the capture liquid that captures the acid component may be referred to as the acid component capture liquid. The acid component capture liquid does not need to be a capture liquid that has captured acid components up to the capture limit, and any capture liquid that captures even a small amount of acid components may be referred to as an acid component capture liquid. That is, the acid component capturing liquid obtained by the manufacturing apparatus 1 may be reusable as a capturing liquid for further capturing acid components.

(manufacturing unit)
The manufacturing apparatus 1 includes a plurality of manufacturing units. FIG. 1 shows an example in which the manufacturing apparatus 1 includes three manufacturing units: a first manufacturing unit 10, a second manufacturing unit 20, and a third manufacturing unit 30. However, the manufacturing apparatus 1 may include a plurality of manufacturing units, and the number is not particularly limited.

Moreover, regarding the plurality of manufacturing units included in the manufacturing apparatus 1, two consecutive manufacturing units can be defined as a first manufacturing unit and a second manufacturing unit, respectively. In this embodiment, for convenience, three manufacturing units are shown as a first manufacturing unit 10, a second manufacturing unit 20, and a third manufacturing unit 30, respectively. However, the manufacturing unit to which the acid gas and the scavenging liquid are first supplied need not be the first manufacturing unit, and one of any two consecutive manufacturing units may be the first manufacturing unit.

The first manufacturing unit 10 has a first gas supply line 11 , a first liquid supply line 12 , a first merging section 13 , a first contact line 14 , and a first separation device 15 . Similarly, the second manufacturing unit 20 includes a second gas supply line 21, a second liquid supply line 22, a second merging section 23, a second contact line 24, and a second separation device 25. There is. Further, the third manufacturing unit 30 includes a third gas supply line 31, a third liquid supply line 32, a third merging section 33, a third contact line 34, and a third separation device 35. .

The configurations of the second manufacturing unit 20 and the third manufacturing unit 30 are similar to the configuration of the first manufacturing unit 10 unless otherwise specified. That is, the gas supply line, liquid supply line, confluence section, contact line, and separation device that each manufacturing unit has are members that have the same configuration in any manufacturing unit. Therefore, the configuration of the first manufacturing unit 10 will be mainly described below, and the second manufacturing unit 20 and the third manufacturing unit 30 will mainly be described with respect to the differences from the first manufacturing unit 10.

Furthermore, in this embodiment, for each fluid supplied to the first manufacturing unit 10, when the acidic gas is referred to as a first acidic gas, the capture liquid is referred to as a first capture liquid, and the acid component capture liquid is referred to as a first acid component capture liquid. There is. Regarding each fluid supplied to the second manufacturing unit 20, the acidic gas may be referred to as a second acidic gas, the capture liquid may be referred to as a second capture liquid, and the acid component capture liquid may be referred to as a second acid component capture liquid. Regarding each fluid supplied to the third manufacturing unit 30, the acidic gas may be referred to as a third acidic gas, the capture liquid may be referred to as a third capture liquid, and the acid component capture liquid may be referred to as a third acid component capture liquid.

The first gas supply line 11 is a gas flow path that supplies acidic gas. In the manufacturing apparatus 1, the acidic gas supplied to the manufacturing apparatus 1 is divided and supplied to the first gas supply line 11, the second gas supply line 21, and the third gas supply line 31.

The first liquid supply line 12 is a liquid flow path that supplies a captured liquid. The first liquid supply line 12 may be supplied with a capture liquid that does not capture acid components. The first captured liquid that has passed through the first liquid supply line 12 joins the first acidic gas that has passed through the first gas supply line 11 at the first merging section 13 . The first merging section 13 may have any configuration as long as the first gas supply line 11 and the first liquid supply line 12 join together.

The first contact line 14 is a flow path through which the first acidic gas supplied from the first gas supply line 11 and the first capture liquid supplied from the first liquid supply line 12 are brought into contact with each other. The first contact line 14 is downstream of the first gas supply line 11 and the first liquid supply line 12 and is connected to these lines via a first confluence section 13 . Due to the contact between the first acidic gas and the first capture liquid in the first contact line 14, the first capture liquid captures the acid component contained in the first acidic gas, and a first acid component capture liquid is obtained.

The mode of capturing the acid component in the first acid component capturing liquid may be such that the acid component is absorbed into the liquid by binding with a scavenging agent such as an organic amine compound dissolved in the first capturing liquid. It may also be an embodiment in which it is adsorbed to a trapping agent such as an inorganic porous material dispersed in a trapping liquid.

The first contact line 14 is preferably configured as a fine channel. In the first contact line 14, the first acidic gas may be present as gas bubbles dispersed in the first capture liquid. The larger the contact area between the bubbles of the first acidic gas and the first capture liquid, the easier it is for the acid component in the first acidic gas to be captured by the first capture liquid, improving the efficiency of capturing the acid component. Here, if the first contact line 14 is configured as a fine flow path, as shown in FIG. 2, the first acidic gas bubbles and the first captured liquid alternately exist in a so-called slag liquid state. Cheap. Therefore, the contact area between the acid component contained in the first acidic gas and the first capture liquid is easily maximized, and the acid component can be efficiently captured in the first capture liquid.

In order to configure the first contact line 14 as a fine channel, for example, the inner diameter of the first contact line 14 may be 1.5 mm or more and 4.5 mm or less, and may be 1.8 mm or more and 3.5 mm or less. It is preferably 2 mm or more and 2.5 mm or less. If the first contact line 14 is configured as a fine channel having such an inner diameter, the acid component can be efficiently captured in the first capture liquid in the first contact line 14.

The first separation device 15 is a member that separates the first acidic gas that has passed through the first contact line 14 and has come into contact with the first capture liquid from the first acid component capture liquid. FIG. 3 shows an example of the configuration of the first separation device 15. The first acid component capturing liquid and the first acidic gas flow into the first separation device 15 from the first contact line 14 . In the container of the first separation device 15, the first acid gas moves to the gas layer due to the difference in specific gravity between the first acid component capturing liquid and the first acid gas, so that the first acid gas becomes the first acid component. separated from the capture liquid.

Note that the first separation device 15 is not particularly limited as long as it has a configuration that can separate the first acid component capturing liquid and the first acidic gas, and may be a general liquid-gas separation device. The first acidic gas separated from the first separation device 15 is an acidic gas with a lower concentration of acid components than the first acidic gas before being supplied to the first production unit 10, and may be referred to as off-gas. . For convenience, in this specification, the off-gas in which the acid component has been completely removed from the first acidic gas by the first production unit 10 is also described as being included in one aspect of the "acidic gas separated from the separation device". do.

The first separation device 15 is connected to the second liquid supply line 22 . In other words, the first contact line 14 and the second liquid supply line 22 are connected via the first separation device 15. Further, the first acid component capturing liquid separated from the first acidic gas by the first separation device 15 is supplied to the second liquid supply line 22 as a second capturing liquid for capturing acid components in the second manufacturing unit 20. Supplied.

An acidic gas having the same acid component concentration as the first acidic gas supplied to the first gas supply line 11 is supplied to the second gas supply line 21 as a second acidic gas. Similarly to the first manufacturing unit 10, the second manufacturing unit 20 brings the second acidic gas into contact with the second trapping liquid in the second contact line 24 to obtain a second acid component trapping liquid. The separation device 25 separates the second acidic gas and the second acid component trapping liquid after contact with the second trapping liquid.

According to such a configuration, the first capture liquid supplied in the first manufacturing unit 10 is distributed and supplied in series to the second manufacturing unit 20. Thereby, the manufacturing apparatus 1 can bring the acid gas into contact with the trapping liquid in multiple stages without circulating the trapping liquid, and can efficiently trap the acid component in the acidic gas.

Further, the second separation device 25 is connected to a third liquid supply line 32. The second acid component capturing liquid separated from the second acidic gas by the second separation device 25 is supplied to the third liquid supply line 32 as a third capturing liquid for capturing the acid component in the third manufacturing unit 30. be done.

An acidic gas having the same acid component concentration as the first acidic gas and the second acidic gas is supplied to the third gas supply line 31 as the third acidic gas. Similarly to the first manufacturing unit 10 and the second manufacturing unit 20, the third manufacturing unit 30 brings the third acidic gas into contact with the third capturing liquid in the third contact line 34 to produce a third acid component capturing liquid. get. Subsequently, the third manufacturing unit 30 uses the third separation device 35 to separate the third acidic gas and the third acid component capturing liquid after contacting with the third capturing liquid.

In this way, it is preferable that the manufacturing apparatus 1 has three or more manufacturing units. As the number of production units increases, the amount of acid component captured per unit volume in the capture liquid supplied to the production apparatus 1 improves. Therefore, the acid component can be efficiently captured from the acidic gas using a small amount of capturing liquid. Furthermore, in the manufacturing apparatus 1, the acidic gas is divided and supplied to each manufacturing unit. Therefore, when a large amount of acidic gas is supplied to the manufacturing apparatus 1, the acid component can be captured in a shorter time as the number of manufacturing units increases.

Further, the first acidic gas, which is the acidic gas supplied from the first gas supply line 11, and the second acidic gas, which is the acidic gas supplied from the second gas supply line 21, have a concentration of acid components contained in They may be different from each other. Similarly, regarding the third acidic gas, the first acidic gas and the second acidic gas may have different concentrations of acid components contained therein. In other words, the acidic gas supplied to the manufacturing apparatus 1 may contain acid components with different concentrations for each manufacturing unit.

For example, the acidic gas supplied to the manufacturing apparatus 1 may not be divided and supplied to the gas supply lines of each manufacturing unit, but a different acidic gas may be supplied to each gas supply line. In this way, the manufacturing apparatus 1 may include independent gas supply lines for each manufacturing unit, and may be configured to be able to supply acidic gas independently for each gas supply line.

According to such a configuration, the acid component concentration of the acidic gas supplied to each manufacturing unit can be adjusted for each manufacturing unit. Therefore, the acid component concentration of the acidic gas supplied to each manufacturing unit can be optimized so that the acid component can be efficiently captured by the manufacturing apparatus 1 as a whole.

For example, the concentration of the acid component contained in the second acidic gas may be higher than the concentration of the acid component contained in the first acidic gas. Moreover, the concentration of the acid component contained in the third acidic gas may also be higher than the concentration of the acid component contained in the second acidic gas. According to such a configuration, the acidic gas supplied to the manufacturing unit located downstream of the manufacturing apparatus 1 has a higher concentration of the acid component. Thereby, the first manufacturing unit 10 can reliably capture acid components from the first acidic gas having a low concentration of acid components. On the other hand, in the second manufacturing unit 20 and the third manufacturing unit 30 in the latter stages, it is possible to trap the acid component up to a concentration close to the upper limit that can be trapped by the trapping liquid. Thereby, the efficiency of capturing acid components in the manufacturing apparatus 1 as a whole can be increased.

Further, the first acidic gas separated by the first separation device 15 of the first manufacturing unit 10 may be supplied as the second acidic gas to the second manufacturing unit 20. In this case, the second gas supply line 21 may be connected to the first separation device 15. According to such a configuration, the acid component can be further captured in the second manufacturing unit 20 from the off-gas discharged from the first manufacturing unit 10. Therefore, acid components can be captured from acidic gas with high efficiency.

As described above, according to the manufacturing apparatus 1 according to the present embodiment, the acid component contained in the acidic gas can be efficiently captured in the capture liquid. The acid component contained in the acidic gas includes a greenhouse gas such as carbon dioxide or a corrosive component such as hydrogen chloride. The manufacturing apparatus 1 can reduce greenhouse gases or harmful gases emitted into the atmosphere by efficiently capturing such acid components from acidic gases. Such effects are due to, for example, Goal 12.4 of the Sustainable Development Goals (SDGs) advocated by the United Nations, “reducing the release of chemicals into the atmosphere” and Goal 13.3, “mitigating climate change.” It also contributes to achieving this goal.

[Manufacturing system]
A manufacturing system 100 including a plurality of manufacturing apparatuses 1 according to an embodiment of the present invention is also included in one aspect of the present invention. As shown in FIG. 4, in the manufacturing system 100 according to this embodiment, a plurality of (n) manufacturing apparatuses 1 are connected to each other.

Regarding the plurality of manufacturing devices 1 included in the manufacturing system 100, two consecutive manufacturing devices 1 can be defined as a first manufacturing device and a second manufacturing device, respectively. In this embodiment, for convenience, each manufacturing apparatus 1 is shown as a first manufacturing apparatus 1-i, a second manufacturing apparatus 1-ii, and a third manufacturing apparatus 1-iii, and the nth manufacturing apparatus 1 is referred to as the nth manufacturing apparatus 1. -n. However, the manufacturing apparatus 1 to which acidic gas is first supplied in the manufacturing system 100 does not need to be the first manufacturing apparatus, and one of any two consecutive manufacturing apparatuses 1 may be the first manufacturing apparatus.

In FIG. 4, the capture liquids supplied to each manufacturing apparatus 1 are shown as capture liquid i, capture liquid ii, capture liquid iii, and capture liquid n, respectively. Further, the acid component capture liquids obtained from each manufacturing apparatus 1 are shown as acid component capture liquid i, acid component capture liquid ii, acid component capture liquid iii, and acid component capture liquid n, respectively. Further, off-gas separated from each manufacturing apparatus 1 is shown as off-gas i, off-gas ii, off-gas iii, and off-gas n, respectively.

The first manufacturing apparatus 1-i is supplied with acidic gas such as untreated exhaust gas before the acid component is captured. The acidic gas is supplied to each manufacturing unit of the first manufacturing apparatus 1-i to obtain an acid component trapping liquid i, and at the same time, off-gas i is discharged from each manufacturing unit.

The off-gas i discharged from the first manufacturing apparatus 1-i is then supplied as acidic gas to each manufacturing unit of the second manufacturing apparatus 1-ii. At this time, the acidic gas separated from the acid component capturing liquid by the separation device of at least one of the manufacturing units of the first manufacturing apparatus 1-i is separated from the acidic gas by the separation device of at least one of the manufacturing units of the first manufacturing apparatus 1-i. may be supplied to a gas supply line having a

For example, the off-gas i discharged from the most upstream manufacturing unit of the first manufacturing apparatus 1-i may be supplied to the most downstream manufacturing unit of the second manufacturing apparatus 1-ii. Further, the off-gas i discharged from the most downstream manufacturing unit of the first manufacturing apparatus 1-i may be supplied to the most upstream manufacturing unit of the second manufacturing apparatus 1-ii. According to such a configuration, the off-gas discharged from each manufacturing unit of one manufacturing apparatus 1 included in the manufacturing system 100 can be supplied as acidic gas to each manufacturing unit of another manufacturing apparatus 1.

Similarly, in the manufacturing apparatuses 1 after the second manufacturing apparatus 1-ii, the off-gas discharged from the previous manufacturing apparatus 1 is supplied to the next manufacturing apparatus 1 as acidic gas. In this way, the concentration of the acid component in the acid gas is gradually reduced by each manufacturing apparatus 1 repeatedly capturing the acid component from the acid gas and acquiring the acid component capture liquid. Further, each manufacturing apparatus 1 may be supplied with a capture liquid that does not capture the acid component. According to such a configuration, the manufacturing system 100 can efficiently capture the acid component in the acidic gas. If the manufacturing system 100 includes a large number of manufacturing devices 1, it is also possible to completely remove acid components from acidic gas.

〔Production method〕
A manufacturing method for manufacturing an acid component capturing liquid using the manufacturing apparatus 1 according to an embodiment of the present invention is also included in one aspect of the present invention. The manufacturing method according to this embodiment includes a first capturing step and a second capturing step.

The first capturing step is a step in which the first capturing liquid and the first acidic gas are brought into contact with each other in the first manufacturing unit 10 to obtain a first acid component capturing liquid. In addition, in the second trapping step, the first acid component trapping liquid and the second acidic gas are supplied to the second manufacturing unit 20, and the first acid component trapping liquid and the second acidic gas are brought into contact with each other to obtain the second acid component. This is the step of obtaining a capture liquid.

In addition, in the manufacturing method according to the present embodiment, as described above, one of any two consecutive manufacturing units in the manufacturing apparatus 1 may be the first manufacturing unit, and the first capturing step may be performed by This is a step of obtaining a first acid component capturing liquid in the manufacturing unit. Therefore, the second acid component capturing liquid obtained in the second capturing step is not limited to the acid component capturing liquid obtained from the second manufacturing unit from the most upstream in the manufacturing apparatus 1. In the manufacturing apparatus 1, the acid component trapping liquid obtained from at least any manufacturing unit from the second most upstream side onward can be said to be the second acid component trapping liquid obtained in the manufacturing method according to the present embodiment.

A specific example of the manufacturing method according to the present embodiment is as described in the "Manufacturing Apparatus" section, so the description will be omitted here.

[Collection method]
Further, the acid component includes an acquisition step of acquiring the second acid component trapping liquid produced by the manufacturing method according to an embodiment of the present invention, and a recovery step of separating the acid component from the obtained second acid component trapping liquid. A method for recovering is also included in one embodiment of the present invention.

The acquisition step may be carried out by a general method. The acquisition step may be, for example, a step of directly pumping the second acid component capturing liquid separated from the second separation device 25, or a step of acquiring the second acid component capturing liquid through a liquid flow path or the like. Good too.

The recovery step may also be carried out by a general method, for example, it may be a step of heating the second acid component capturing liquid to remove the bond between the scavenger and the acid component.

〔summary〕
A manufacturing apparatus according to aspect 1 of the present invention is an acid component scavenging liquid manufacturing apparatus in which a plurality of manufacturing units are connected, and two consecutive manufacturing units among the plurality of manufacturing units are connected to a first manufacturing unit. unit and a second manufacturing unit, each of the first manufacturing unit and the second manufacturing unit includes a gas supply line that supplies an acidic gas, and a scavenger that captures an acid component contained in the acidic gas. A liquid supply line that supplies a capture liquid, the acidic gas supplied from the gas supply line, and the capture liquid supplied from the liquid supply line are brought into contact with each other through flow, and an acid component containing the acid component is introduced. a contact line for obtaining a capture liquid, and a separation device that separates the acidic gas that has passed through the contact line and has come into contact with the capture liquid from the acid component capture liquid, and The contact line and the liquid supply line of the second manufacturing unit are connected via the separation device of the first manufacturing unit, and the acid separated by the separation device of the first manufacturing unit is connected to the liquid supply line of the second manufacturing unit. A component capture liquid is supplied to the liquid supply line as the capture liquid in the second manufacturing unit.

In the manufacturing apparatus according to Aspect 2 of the present invention, in Aspect 1, the first acidic gas, which is the acidic gas supplied from the gas supply line of the first manufacturing unit, and the gas supply of the second manufacturing unit are provided. The second acidic gas, which is the acidic gas supplied from the line, may have a different concentration of the acid component contained therein.

In the manufacturing apparatus according to aspect 3 of the present invention, in aspect 2, the concentration of the acid component contained in the second acidic gas may be higher than the concentration of the acid component contained in the first acidic gas. .

In the manufacturing apparatus according to aspect 4 of the present invention, in aspect 2 or 3, the second acidic gas may be the acidic gas separated by the separation device of the first manufacturing unit.

In the manufacturing apparatus according to aspect 5 of the present invention, in any one of aspects 1 to 4, the acid component may be carbon dioxide.

In the manufacturing apparatus according to aspect 6 of the present invention, in any one of aspects 1 to 5, the capturing liquid may contain at least one type of organic amine compound as the capturing agent.

In the manufacturing apparatus according to aspect 7 of the present invention, in either of aspects 1 or 6, the contact line may be configured as a fine channel.

A manufacturing system according to aspect 8 of the present invention is a manufacturing system comprising a plurality of manufacturing devices according to any one of aspects 1 to 7, wherein the plurality of manufacturing devices are connected to each other, and two consecutive When the manufacturing apparatuses are respectively referred to as a first manufacturing apparatus and a second manufacturing apparatus, the acidic gas separated from the acid component capturing liquid by a separation device included in at least one of the manufacturing units included in the first manufacturing apparatus is The gas is supplied to a gas supply line of at least one of the manufacturing units included in the manufacturing apparatus.

A manufacturing method according to aspect 9 of the present invention is a manufacturing method for manufacturing the acid component scavenging liquid using the manufacturing apparatus according to any one of aspects 1 to 7, wherein in the first manufacturing unit, the scavenging liquid and the acidic gas are brought into contact with each other to obtain a first acid component trapping liquid, and the first acid component trapping liquid and the acidic gas are supplied to the second production unit, and the first acid component trapping liquid is and a second trapping step of contacting the trapping liquid with the acidic gas to obtain a second acid component trapping liquid.

The acid component recovery method according to aspect 10 of the present invention includes an acquisition step of acquiring the second acid component capturing liquid produced by the manufacturing method according to aspect 9; and a recovery step of separating the.

An embodiment of the present invention will be described below. As an example of the present invention, carbon dioxide in acidic gas containing carbon dioxide was captured using the manufacturing apparatus 1, and the amount of captured carbon dioxide was examined. As a comparative example, carbon dioxide in acidic gas containing carbon dioxide was captured using an acid component capture liquid manufacturing apparatus having a single production unit, and the amount of captured carbon dioxide was examined.

(Experimental conditions)
As the acidic gas containing carbon dioxide, a mixed gas (carbon dioxide 16.7% by volume) obtained by mixing nitrogen gas supplied at a flow rate of 100 cc/min and carbon dioxide gas supplied at a flow rate of 20 cc/min was used. . In the example, the above-mentioned mixed gas containing carbon dioxide at the same concentration was supplied as an acid gas to all three manufacturing units included in the manufacturing apparatus 1.

As the capture liquid, a 30% by mass monoethanolamine aqueous solution containing monoethanolamine (MEA) as a capture agent was used. In addition, the contact line provided in the manufacturing apparatus 1 or the manufacturing apparatus according to the comparative example used a fine flow path configured by a 1/8 inch tube (inner diameter 2.17 mm, outer diameter 3.17 mm).

The results of other experimental conditions and carbon dioxide capture efficiency (%) in Examples and Comparative Examples are shown in Table 1 below. In Table 1 below, "contact line passage time" indicates the time required for the mixed fluid of acidic gas and capture liquid to pass from the inlet to the outlet of the contact line (capture reaction time). Moreover, the "total contact time" indicates the total time during which all the acidic gas and capture liquid supplied to the manufacturing apparatus 1 or the manufacturing apparatus according to the comparative example circulated through the contact line as a mixed fluid.

Moreover, the carbon dioxide capture efficiency indicates the rate at which the amount of carbon dioxide (volume %) in the acid gas decreases after being supplied to the contact line. Regarding the example, the trapping efficiency of the first manufacturing unit 10 alone is referred to as "first", the trapping efficiency of the second manufacturing unit 20 alone is referred to as "second", and the trapping efficiency of the third manufacturing unit 30 alone is referred to as "second". 3" respectively.

In the example, since the manufacturing apparatus 1 including three manufacturing units was used, the mixed fluid of acidic gas and capture liquid flows through the contact lines of each manufacturing unit. For example, since the mixed fluid flows through three contact lines for 4 seconds each, Table 1 describes it as "4 sec (x3)". The same applies to the capture liquid supply amount, carbon dioxide supply amount, and total contact time.

In a comparative example, the length of the contact line or the pressure within the contact line was changed to examine the amount of carbon dioxide trapped under each condition. The pressure in the contact line was regulated by providing a conventional back pressure valve in the contact line. Increasing the pressure in the contact line reduces the volume of the acid gas bubbles in the capture liquid and increases the contact area between the capture liquid and the acid gas bubbles. Further, regarding the acid gas bubbles, the concentration (number of moles) of the acid component per volume increases, and the contact time between the capture liquid and the acid gas bubbles also increases. It is thought that this increases the carbon dioxide capture efficiency in the capture liquid.

(Experimental result)
FIG. 5 shows the carbon dioxide content α (mol CO ₂ /mol MEA) in the capture liquid in Examples and the carbon dioxide capture efficiency (%) in each production unit. In FIG. 5, the result of the first manufacturing unit 10 is shown as "CO2 lean-MEA" from the value of α of the capture liquid supplied to each manufacturing unit. This is because the first manufacturing unit 10 is supplied with a capture liquid that does not capture carbon dioxide (α=0). Further, the results of the second manufacturing unit 20 are shown as "CO2 rich-MEA [α=0.22]", and the results of the third manufacturing unit 30 are shown as "CO2 rich-MEA [α=0.41]".

In the example, α of the final acid component trapping liquid was 0.46. This indicates that carbon dioxide corresponding to about 87% of the upper limit of the carbon dioxide capture capacity of the capture liquid was captured. The capture reaction time in the example was substantially 12 seconds (4 seconds x 3), indicating that carbon dioxide could be captured with extremely high time efficiency.

Next, FIG. 6 shows the relationship between the carbon dioxide content α (mol CO ₂ /mol MEA) in the capture liquid and the passage time of the mixed fluid through the contact line for the results of each comparative example. Figure 6 shows α = 0.0300, which is the upper limit of α for the capture liquid according to the comparative example, and α = 0 for the capture liquid that captured carbon dioxide by batch absorption (simply blowing acidic gas into the capture liquid). A value of .0188 is shown as a reference value. Note that since the upper limit value of α of the capture liquid may vary depending on the conditions of the experimental apparatus, etc., the upper limit value of α of the capture liquid is different between the Examples and the Comparative Example. As shown in Examples and Comparative Examples, the upper limit value of α may be obtained for each experimental condition, and the values obtained in each experiment may be compared with the upper limit value.

The results of each comparative example showed that the value of α was improved by lengthening the capture reaction time (residence time in the micro-channel) in the contact line. The highest value of α was obtained under the conditions where the trapping reaction time was longest, the length of the contact line was 50 m, and the pressure of the contact line was 0.2 MPa. α=0.0258 in this condition is a value indicating that carbon dioxide equivalent to about 86% of the upper limit of the carbon dioxide capture capacity of the capture liquid was captured. However, this condition required a capture reaction time of 200 seconds or more. Furthermore, as the capture reaction time became longer, the efficiency of increasing the amount of carbon dioxide captured decreased, and almost no increase in the amount of carbon dioxide captured was observed after the capture reaction time exceeded about 50 seconds.

From the above results, it was shown that by using the manufacturing apparatus 1 according to an embodiment of the present invention, it is possible to capture acid components such as carbon dioxide from acidic gas with extremely higher time efficiency than conventional methods. .

[Additional notes]
The present invention is not limited to the embodiments and examples described above, and various changes can be made within the scope of the claims. Embodiments obtained by appropriately combining technical means disclosed in different embodiments or examples are also included in the technical scope of the present invention.

1 Manufacturing equipment 10 First manufacturing unit (manufacturing unit)
11 First gas supply line (gas supply line)
12 First liquid supply line (liquid supply line)
14 First contact line (contact line)
15 First separation device (separation device)
20 Second manufacturing unit (manufacturing unit)
21 Second gas supply line (gas supply line)
22 Second liquid supply line (liquid supply line)
24 Second contact line (contact line)
25 Second separation device (separation device)
30 Third manufacturing unit (manufacturing unit)
31 Third gas supply line (gas supply line)
32 Third liquid supply line (liquid supply line)
34 Third contact line (contact line)
35 Third separation device (separation device)
100 Manufacturing system

Claims (10)

An apparatus for producing an acid component scavenging liquid in which a plurality of production units are connected,
Among the plurality of manufacturing units, two consecutive manufacturing units are respectively referred to as a first manufacturing unit and a second manufacturing unit,
Each of the first manufacturing unit and the second manufacturing unit,
a gas supply line that supplies acidic gas;
a liquid supply line that supplies a capture liquid containing a capture agent that captures acid components contained in the acidic gas;
a contact line that allows the acidic gas supplied from the gas supply line and the capture liquid supplied from the liquid supply line to flow and come into contact with each other to obtain an acid component capture liquid containing the acid component;
a separation device that separates the acidic gas that has passed through the contact line and been in contact with the capture liquid from the acid component capture liquid;
The contact line of the first manufacturing unit and the liquid supply line of the second manufacturing unit are connected via the separation device of the first manufacturing unit, and the separation device of the first manufacturing unit An apparatus for producing an acid component capturing liquid, wherein the acid component capturing liquid separated by is supplied to the liquid supply line as the capturing liquid in the second production unit. What is the first acidic gas that is the acidic gas supplied from the gas supply line of the first manufacturing unit and the second acidic gas that is the acidic gas that is supplied from the gas supply line of the second manufacturing unit? 2. The apparatus for producing an acid component capturing liquid according to claim 1, wherein the concentrations of the acid components contained therein are different from each other. The apparatus for producing an acid component capturing liquid according to claim 2, wherein the concentration of the acid component contained in the second acidic gas is higher than the concentration of the acid component contained in the first acidic gas. The apparatus for producing an acid component capturing liquid according to claim 2, wherein the second acidic gas is the acidic gas separated by the separation device of the first production unit. The apparatus for producing an acid component capturing liquid according to claim 1, wherein the acid component is carbon dioxide. The apparatus for producing an acid component trapping liquid according to claim 1, wherein the trapping liquid contains at least one kind of organic amine compound as the trapping agent. The apparatus for producing an acid component-capturing liquid according to claim 1, wherein the contact line is configured as a fine channel. A manufacturing system comprising a plurality of manufacturing devices according to any one of claims 1 to 7,
The plurality of manufacturing devices are connected to each other, and two consecutive manufacturing devices among them are respectively referred to as a first manufacturing device and a second manufacturing device,
The acidic gas separated from the acid component capturing liquid by a separation device included in at least one of the production units included in the first production apparatus is supplied to a gas supply line included in at least one of the production units included in the second production apparatus. A production system for acid component scavenging liquid. A manufacturing method for manufacturing the acid component scavenging liquid using the manufacturing apparatus according to any one of claims 1 to 7, comprising:
In the first manufacturing unit, a first capturing step of contacting the capturing liquid and the acidic gas to obtain a first acid component capturing liquid;
a second trapping step of supplying the first acid component trapping liquid and the acidic gas to the second production unit and bringing the first acid component trapping liquid and the acidic gas into contact to obtain a second acid component trapping liquid; A method for producing an acid component scavenging liquid, comprising: an obtaining step of obtaining the second acid component capturing liquid produced by the production method according to claim 9;
A method for recovering an acid component, comprising a recovery step of separating the acid component from the second acid component capturing liquid.

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