Carbon dioxide treatment apparatus and carbon dioxide treatment method

Abstract

To provide a carbon dioxide treatment apparatus and a carbon dioxide treatment method that can easily separate the absorbent after absorbing carbon dioxide from the absorbent before absorbing carbon dioxide. [Solution] This is a carbon dioxide treatment device 1 that removes carbon dioxide from carbon dioxide-containing gas emitted from a carbon dioxide emission facility. The device 1 is capable of receiving the gas and comprises a treatment unit 2 containing an amine compound and a dispersant. The dispersant has the effect of suppressing the solidification of solid matter produced when the amine compound reacts with carbon dioxide.

Description

Technical Field

[0001] The present invention relates to a carbon dioxide treatment apparatus and a carbon dioxide treatment method.

Background Art

[0002] In recent years, from the perspective of global environmental protection, there has been active discussion about reducing emissions of carbon dioxide, which is a greenhouse gas, but truly effective solutions have not yet been found. As a solution, technologies for efficiently recovering high-concentration carbon dioxide from exhaust gas emitted from industrial facilities and burying and storing it underground or in the sea (CCS: Carbon dioxide Capture and Storage) have been actively studied in recent years. For such carbon dioxide treatment, an absorbent that can reversibly absorb carbon dioxide is used. When causing such an absorbent to absorb carbon dioxide, due to the reversibility of carbon dioxide absorption, there has been a problem in that the apparent rate of the carbon dioxide absorption reaction decreases as the carbon dioxide absorption progresses.

[0003] In order to solve the above problems, for example, by separating the absorbent after absorbing carbon dioxide from the absorbent before absorbing carbon dioxide, the influence of the reverse reaction may be suppressed. In this regard, for example, in Patent Document 1, a carbon dioxide absorbent composed of an amine selected from the group consisting of m-xylenediamine, benzylamine, phenethylamine, p-methoxybenzylamine, and p-trifluoromethylbenzylamine and water is proposed. Since the carbamic acid derivative or bicarbonate formed after such a carbon dioxide absorbent absorbs carbon dioxide has extremely high hydrophobicity, it is described in the same document that it can be separated from the carbon dioxide absorbent before absorbing carbon dioxide.

Prior Art Documents

Patent Documents

[0004] [[ID=二十六]]

Patent Document 1

Summary of the Invention

[0005] Incidentally, when performing carbon dioxide treatment on an industrial scale, it is desirable to easily separate the absorbent after it has absorbed carbon dioxide, in order to reduce costs. Although the carbon dioxide absorbent described in Patent Document 1 can be separated after absorbing carbon dioxide, there was a demand for a simpler separation method.

[0006] Therefore, the object of the present invention is to provide a carbon dioxide treatment apparatus and a carbon dioxide treatment method that can easily separate the absorbent after absorbing carbon dioxide from the absorbent before absorbing carbon dioxide. [Means for solving the problem]

[0007] The present invention relates to a carbon dioxide treatment apparatus for removing carbon dioxide from carbon dioxide-containing gas emitted from a carbon dioxide emission facility, The apparatus is capable of receiving the gas and comprises a processing unit containing an amine compound and a dispersant. The present invention provides a carbon dioxide treatment apparatus in which the dispersant has the effect of suppressing the solidification of solids produced by the reaction of the amine compound with carbon dioxide.

[0008] Furthermore, the present invention relates to a carbon dioxide treatment method for removing carbon dioxide from carbon dioxide-containing gas emitted from a carbon dioxide emission facility, The method described above includes a first step of blowing the gas into a liquid phase containing an amine compound and a dispersant charged in a processing unit, and reacting the amine compound with carbon dioxide to produce a solid, The present invention provides a carbon dioxide treatment method in which the dispersant has an effect of suppressing the solidification of the solid matter. [Effects of the Invention]

[0009] According to the present invention, a carbon dioxide treatment apparatus and a carbon dioxide treatment method are provided that can easily separate the absorbent after absorbing carbon dioxide from the absorbent before absorbing carbon dioxide. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a cross-sectional view showing a preferred embodiment of the carbon dioxide treatment apparatus of the present invention. [Modes for carrying out the invention]

[0011] The present invention will now be described below with reference to the drawings, based on preferred embodiments thereof. First, the carbon dioxide treatment apparatus of the present invention will be described. The carbon dioxide treatment apparatus of the present invention is a device that removes carbon dioxide from carbon dioxide-containing gas emitted from carbon dioxide emission facilities. Examples of carbon dioxide emission facilities include metal refining facilities such as steel mills and non-ferrous metal ironworks, thermal power plants, and kilns for cement clinker production. The carbon dioxide concentration in the carbon dioxide-containing gas emitted from such facilities is typically 1 volume% or more. Furthermore, as will be described later, the carbon dioxide treatment apparatus of the present invention can treat high-concentration carbon dioxide-containing gas, so from the viewpoint of taking advantage of this characteristic, the carbon dioxide concentration in the carbon dioxide-containing gas may be 3 volume% or more, 5 volume% or more, or 10 volume% or more. There is no particular upper limit to the carbon dioxide concentration in the carbon dioxide-containing gas, and the carbon dioxide concentration may be 100 volume%.

[0012] Figure 1 shows a carbon dioxide treatment apparatus 1, which is a preferred embodiment of the present invention. The apparatus 1 comprises a processing unit 2, a regeneration unit 3, and a first pipeline 4 and a second pipeline 5 connecting them.

[0013] The processing unit 2 is equipped with a carbon dioxide introduction pipe 22. One end of the carbon dioxide introduction pipe 22 is connected to the inside of the processing unit 2 (preferably to the processing agent 21 described later), and the other end is connected to a carbon dioxide-containing gas supply source (not shown). Therefore, the processing unit 2 is capable of receiving carbon dioxide-containing gas through the carbon dioxide introduction pipe 22.

[0014] The processing unit 2 contains a treatment agent 21 comprising an amine compound and a dispersant, and is capable of absorbing carbon dioxide from a carbon dioxide-containing gas introduced into the processing unit 2 into the amine compound. As shown in the figure, the treatment agent 21 is typically a liquid. Details of the treatment agent 21 will be described later. Figure 1 shows the solid matter 24 produced in the treatment agent 21 by the reaction of an amine compound with carbon dioxide. This solid matter 24 also contains a dispersant that was pre-added to the treatment agent 21. Details of the dispersant will be described later. In this specification, "amine compounds react with carbon dioxide" and "amine compounds absorb carbon dioxide" encompass both the form in which the amine compound reacts with carbon dioxide and the form in which carbon dioxide is adsorbed onto the amine compound (without reacting with carbon dioxide). When an amine compound reacts with carbon dioxide, the product is typically a bicarbonate or carbamic acid derivative of the amine compound.

[0015] The processing unit 2 is further equipped with an exhaust port 23. One end of the exhaust port 23 is connected to the inside of the processing unit 2, and the other end is connected to the outside of the device 1. The carbon dioxide-containing gas introduced into the processing unit 2 has the carbon dioxide removed by the processing agent 21, and is then released to the outside of the device 1 through the exhaust port 23.

[0016] Apparatus 1 includes a first conduit 4 connecting the processing unit 2 and the regeneration unit 3. The first conduit 4 is a conduit for supplying solid material 24 from the processing unit 2 to the regeneration unit 3. In the illustrated embodiment, the solid material 24 in the processing unit 2 falls into the regeneration unit 3 by gravity. In addition to the solid material 24, the first conduit 4 can also supply the liquid component of the processing agent 21 from the processing unit 2 to the regeneration unit 3. The first pipeline 4 is provided with an opening and closing mechanism 41 for controlling the supply of the solid matter 24 from the treatment unit 2 to the regeneration unit 3. When the opening and closing mechanism 41 is open, the solid matter 24 in the treatment unit 2 drops due to gravity and is supplied through the opening and closing mechanism 41 to the regeneration unit 3. On the other hand, when the opening and closing mechanism 41 is closed, the solid matter 24 in the treatment unit 2 remains in the treatment unit 2. The opening and closing mechanism 41 shown in FIG. 1 is a cock, but the opening and closing mechanism 41 is not limited to such a form and may be, for example, a shutter. The opening and closing mechanism 41 may be connected to a control mechanism (not shown) for controlling its opening and closing state. Thereby, for example, the opening and closing mechanism 41 can be controlled so that the opening and closing state of the opening and closing mechanism 41 automatically switches at regular intervals.

[0017] The regeneration unit 3 is a place where the solid matter 24 supplied through the first pipeline 4 is thermally decomposed by heating the solid matter 24 to generate carbon dioxide and an amine-based compound from the solid matter 24. For this purpose, the regeneration unit 3 is provided with heating means (not shown) for heating the solid matter 24. There is no particular limitation on the type of heating means, and heating means commonly used in this field can be appropriately used. The regeneration unit 3 shown in FIG. 1 houses a treatment agent 21 containing the solid matter 24 supplied from the treatment unit 2 and an amine-based compound generated by the thermal decomposition of the solid matter 24.

[0018] The regeneration unit 3 is provided with a recovery pipe 31 for recovering carbon dioxide generated by heating the solid matter 24. One end of the recovery pipe 31 is connected to the inside of the regeneration unit 3, and the other end is connected to a storage container (not shown) for carbon dioxide. Further, the recovery pipe 31 is provided with a cooling unit 32, and water vapor contained in the recovered carbon dioxide can be liquefied and removed.

[0019] The apparatus 1 includes a second pipeline 5 connecting the processing unit 2 and the regeneration unit 3. Through the second pipeline 5, the amine compound regenerated in the regeneration unit 3 and the dispersant present in the regeneration unit 3 can be supplied to the processing unit 2. The second pipeline 5 includes a pump 51, and by operating this pump, the amine compound and the dispersant can be transported to the processing unit 2.

[0020] Next, the details of the treatment agent 21 contained in the processing unit 2 will be described. The type of the amine compound contained in the treatment agent 21 is not particularly limited as long as it can absorb carbon dioxide. Among them, as the amine compound, it is preferable to use an amine compound that generates a solid (solid 24) hardly soluble in water after absorbing carbon dioxide from the viewpoint of facilitating the separation of the solid 24 and water. Examples of such an amine compound include aralkylamine. Aralkylamine reacts with carbon dioxide to generate a bicarbonate or a carbamic acid derivative.

[0021] When using aralkylamine as the amine compound, from the viewpoint of increasing the carbon dioxide absorption amount per unit mass of aralkylamine, the number of carbon atoms of aralkylamine is preferably 20 or less, more preferably 15 or less, still more preferably 10 or less, and even more preferably 8 or less. In addition, the number of carbon atoms of aralkylamine is 7 or more. Examples of aralkylamine that can be particularly preferably used as the amine compound include m-xylenediamine, benzylamine, phenethylamine, p-methoxybenzylamine, and p-trifluoromethylbenzylamine.

[0022] Aralkylamines have a structure in which an aromatic ring (e.g., a benzene ring or a naphthalene ring) is substituted with an aminoalkyl group. Aralkylamines may contain only one aminoalkyl group or two or more. From the viewpoint of sufficiently reducing the solubility in water of the solid 24 produced by the reaction with carbon dioxide, it is preferable for aralkylamines to contain two or more aminoalkyl groups, and more preferable for them to contain only two. An example of an aralkylamine having two or more aminoalkyl groups is m-xylenediamine.

[0023] The treatment agent 21 may contain water. By adding water to the treatment agent 21, the reaction rate between the amine compound and carbon dioxide can be improved. Furthermore, since the amine compound is diluted with water, the viscosity of the treatment agent 21 decreases, making it easier to supply the solid matter 24 from the treatment unit 2 to the regeneration unit 3. From this viewpoint, the ratio of water to the total amount of water and amine compound contained in the treatment agent 21 is preferably 50% by mass or more, preferably 70% by mass or more, more preferably 85% by mass or more, and even more preferably 90% by mass or more. From a similar viewpoint, the ratio of amine compound to the total amount of water and amine compound contained in the treatment agent 21 is preferably 50% by mass or less, more preferably 30% by mass or less, even more preferably 15% by mass or less, and even more preferably 10% by mass or less.

[0024] From the viewpoint of increasing the concentration of the amine compound in the treatment agent 21 to increase the reaction rate with carbon dioxide, and from the viewpoint of suppressing the dissolution of the solid 24 in water, the ratio of water to the total amount of water and amine compound contained in the treatment agent 21 is preferably 99% by mass or less, more preferably 97% by mass or less, and even more preferably 95% by mass or less. From a similar viewpoint, the ratio of the amine compound to the total amount of water and amine compound contained in the treatment agent 21 is preferably 1% by mass or more, more preferably 3% by mass or more, and even more preferably 5% by mass or more.

[0025] As a result of the inventors' investigations, it was found that when carbon dioxide is absorbed by the treatment agent 21 without a dispersant, the resulting solid matter 24 solidifies, making it difficult to transport the solid matter 24 from the treatment unit 2 to the regeneration unit 3. In order to carry out carbon dioxide treatment on an industrial scale, it is desirable to be able to easily separate the absorbent after absorbing carbon dioxide, so the inventors conducted various investigations. As a result, it was found that the above problem can be solved by including a dispersant that has a solidification-suppressing effect on the solid matter 24 in the treatment agent 21. The mechanism by which the dispersant exerts its solidification-suppressing effect is not clear, but it is possible that, for example, the dispersant acts as a seed crystal, causing the formation of many small crystals of the solid matter 24, thereby suppressing the solidification of the solid matter 24. However, the mechanism by which the dispersant exerts its solidification-suppressing effect is not limited to this.

[0026] The dispersant is not limited as long as it has an anti-caking effect on the solid matter 24, but silica particles are preferred because they have a high anti-caking effect. The reason why silica particles have a high anti-caking effect is not clear, but the inventors believe that the silanol groups of the silica particles interact with the amino groups of the amine compounds, thereby effectively suppressing the caking of the amino compounds. Among these, colloidal silica can be cited as silica particles that have a high anti-caking effect. Commercially available colloidal silica may be used, for example, COMPOL® 80 and COMPOL 120 (both manufactured by Fujimi Incorporated Co., Ltd.).

[0027] From the viewpoint of enhancing the anti-caking effect of the dispersant on the solid matter 24, the average particle size of the particles constituting the dispersant powder is preferably 20 nm or more, more preferably 40 nm or more, and even more preferably 60 nm or more. Furthermore, from a similar viewpoint, the average particle size of the particles constituting the dispersant powder is preferably 1000 nm or less, more preferably 300 nm or less, and even more preferably 100 nm or less. The average particle size can be measured by known methods, such as image processing, zetasizing, or dynamic light scattering.

[0028] From the viewpoint of enhancing the carbon dioxide absorption capacity of amine compounds, the pH of the suspension obtained by suspending the dispersant in water is preferably 7.0 to 12.5, more preferably 8.0 to 11.5, and even more preferably 9.0 to 10.5. The pH of the dispersant is measured by known methods, such as the glass electrode method.

[0029] From the viewpoint of sufficiently suppressing the caking of the solid matter 24, the content of the dispersant in the treatment agent 21 is preferably 0.0001% by mass or more, more preferably 0.001% by mass or more, and even more preferably 0.01% by mass or more. Furthermore, from the viewpoint of separating the amine compound containing carbon dioxide and the dispersant, the content of the dispersant in the treatment agent 21 is preferably 50% by mass or less, more preferably 10% by mass or less, and even more preferably 1% by mass or less.

[0030] From the viewpoint of sufficiently suppressing the caking of the solid matter 24, the ratio of the dispersant content to the amine compound content in the treatment agent 21 (dispersant / amine compound) is preferably 0.0003% by mass or more, more preferably 0.003% by mass or more, and even more preferably 0.03% by mass or more. Furthermore, from the viewpoint of separating the amine compound containing carbon dioxide and the dispersant, the ratio of the dispersant content to the amine compound content in the treatment agent 21 (dispersant / amine compound) is preferably 100% by mass or less, more preferably 50% by mass or less, and even more preferably 15% by mass or less.

[0031] Next, a carbon dioxide treatment method for removing carbon dioxide from carbon dioxide-containing gas emitted from a carbon dioxide emission facility using apparatus 1 will be described. This method comprises the following steps 1 to 3. Step 1: A step in which carbon dioxide-containing gas is blown into the liquid phase (treatment agent 21) containing an amine compound and a dispersant that has been placed in the treatment unit 2, and the amine compound reacts with carbon dioxide to produce a solid 24. Second step: In the regeneration unit 3, the solid matter 24 containing the dispersant, which was produced in the first step, is heated to generate carbon dioxide and amine compounds from the solid matter 24. Third step: A step of supplying the amine-based compound produced in the second step and the dispersant present in the regeneration section 3 to the processing section 2.

[0032] In the first step, carbon dioxide-containing gas is supplied to the processing unit 2 through the carbon dioxide introduction pipe 22. When the carbon dioxide-containing gas passes through the processing agent 21 contained in the processing unit 2, the amine-based compounds in the processing agent 21 react with the carbon dioxide, and solid matter 24 is generated.

[0033] Once a predetermined amount of solid matter 24 is obtained, the supply of carbon dioxide-containing gas to the processing unit 2 is stopped, the opening / closing mechanism 41 is opened, and the solid matter 24 containing the dispersant is supplied to the regeneration unit 3. At this time, a portion of the liquid component (water and amine compound) of the processing agent 21 may be supplied to the regeneration unit 3 together with the solid matter 24 and the dispersant. Thus, in this embodiment, the generation of solid matter 24 by the reaction of the amine compound with carbon dioxide and the supply of the solid matter 24 to the regeneration unit 3 are carried out alternately.

[0034] In the second step, the solid 24 is heated to cause thermal decomposition, generating carbon dioxide and amine compounds. The heating temperature of the solid 24 is preferably 60°C to 140°C, more preferably 70°C to 120°C, and even more preferably 80°C to 100°C. Furthermore, the heating time for the solid matter 24 is preferably 0.5 hours or more and 48 hours or less, more preferably 1 hour or more and 24 hours or less, and even more preferably 1.5 hours or more and 12 hours or less. The carbon dioxide generated in this way is discharged to the outside of the device 1 through the recovery pipe 31.

[0035] In the second step, once the thermal decomposition of the solid matter 24 is complete, the amine compound and dispersant present in the regeneration unit 3 are then supplied to the processing unit 2 using the pump 51 (third step). This allows the amine compound and dispersant present in the regeneration unit 3 to be reused, thereby reducing the cost of carbon dioxide treatment. If water is present in the regeneration unit 3, the water may be supplied to the processing unit 2 together with the amine compound and dispersant.

[0036] By repeating the above steps 1 to 3, carbon dioxide treatment can be performed while reusing the treatment agent 21.

[0037] Generally, the reaction between amine compounds and carbon dioxide is an equilibrium reaction. As the reaction between amine compounds and carbon dioxide progresses, the reaction rate of the reverse reaction gradually increases, leading to a problem where the apparent reaction rate between the amine compounds and carbon dioxide decreases. In contrast, in this processing method, the solid matter 24 produced by the reaction between the amine compounds and carbon dioxide is removed from the processing unit 2. Therefore, the decrease in the apparent reaction rate between the amine compounds and carbon dioxide caused by the presence of the solid matter 24 is suppressed. Furthermore, even when the solid matter 24 is heated in the regeneration unit 3, the decrease in the apparent reaction rate that produces carbon dioxide and amine compounds from the solid matter 24, caused by the presence of the amine compounds, is suppressed because the solid matter 24 is separated from the amine compounds present in the processing unit 2. Furthermore, according to this processing method, because the processing agent 21 contains a dispersant, the solidification of the solid matter 24 produced by the reaction between the amine compound and carbon dioxide is suppressed. Therefore, the solid matter 24 can be transferred from the processing unit 2 to the regeneration unit 3 with a simple operation of opening the opening / closing mechanism 41. In contrast, if a processing agent 21 without a dispersant is used, solidification of the solid matter 24 will occur, and it may not be possible to transfer the solid matter 24 from the processing unit 2 to the regeneration unit 3 simply by opening the opening / closing mechanism 41. Therefore, it becomes necessary to transfer the solid matter 24 from the processing unit 2 to the regeneration unit 3 by manual work, for example, by an operator, which is a significant disadvantage in terms of cost.

[0038] As described above, the carbon dioxide treatment apparatus and carbon dioxide treatment method of the present invention suppress the solidification of solid matter 24 produced by the reaction between amine compounds and carbon dioxide, due to the inclusion of a dispersant in the treatment agent 21. Therefore, even carbon dioxide-containing gases with high carbon dioxide concentrations can be treated without causing problems due to the solidification of solid matter 24.

[0039] Although the present invention has been described above based on its preferred embodiments, the present invention is not limited to the embodiments described above. For example, in the processing method of the embodiment described above, the supply of carbon dioxide-containing gas to the processing unit 2 is stopped once, and then the opening / closing mechanism 41 is opened to supply the solid 24 containing the dispersant to the regeneration unit 3. Alternatively, by supplying carbon dioxide-containing gas to the processing unit 2 with the opening / closing mechanism 41 open, the generation of the solid 24 by the reaction between the amine compound and carbon dioxide and the supply of the solid 24 to the regeneration unit 3 may be carried out simultaneously and continuously. Similarly, the supply of the solid 24 containing the dispersant to the regeneration unit 3 and the heating of the solid 24 may be carried out alternately, or both may be carried out simultaneously and continuously.

[0040] Furthermore, in the above-described embodiment, an opening / closing mechanism 41 was used to supply the solid material 24 from the processing unit 2 to the regeneration unit 3, and a pump 51 was used to supply it from the regeneration unit 3 to the processing unit 2. However, by reversing the vertical relationship between the processing unit 2 and the regeneration unit 3, a pump may be used to supply the solid material 24 from the processing unit 2 to the regeneration unit 3, and an opening / closing mechanism may be used to supply it from the regeneration unit 3 to the processing unit 2. Alternatively, pumps may be used for both supplies.

[0041] The above embodiments of the present invention encompass the following technical concepts. [1] A carbon dioxide treatment device for removing carbon dioxide from carbon dioxide-containing gas emitted from a carbon dioxide emission facility, The apparatus is capable of receiving the gas and comprises a processing unit containing an amine compound and a dispersant. The carbon dioxide treatment apparatus is characterized by a dispersant that has an effect of suppressing the caking of solids produced when the amine compound reacts with carbon dioxide. [2] The carbon dioxide treatment apparatus according to [1], further comprising a regeneration unit that heats the solid containing the dispersant generated in the processing unit to generate carbon dioxide and the amine compound from the solid. [3] The device further comprises a conduit connecting the processing unit and the regeneration unit, The carbon dioxide treatment apparatus according to [2], wherein the pipeline is configured to allow the supply of the amine compound regenerated in the regeneration section and the dispersant present in the regeneration section to the treatment section. [4] The carbon dioxide treatment apparatus according to any one of [1] to [3], wherein the amine compound is an aralkylamine. [5] The carbon dioxide treatment apparatus according to [4], wherein the amine compound contains two or more aminoalkyl groups. [6] The carbon dioxide treatment apparatus according to any one of [1] to [5], wherein the dispersant is silica particles. [7] The carbon dioxide treatment apparatus according to any one of [1] to [6], wherein the dispersant is colloidal silica. [8] A carbon dioxide treatment method for removing carbon dioxide from carbon dioxide-containing gas emitted from a carbon dioxide emission facility, The method described above includes a first step of blowing the gas into a liquid phase containing an amine compound and a dispersant charged in a processing unit, and reacting the amine compound with carbon dioxide to produce a solid, A carbon dioxide treatment method wherein the dispersant has an effect of suppressing the solidification of the solid matter. [9] The carbon dioxide treatment method according to [8], further comprising a second step of heating the solid containing the dispersant generated in the first step in a regeneration unit to generate carbon dioxide and the amine compound from the solid.

[10] The carbon dioxide treatment method according to [9], further comprising a third step of supplying the amine compound produced in the second step and the dispersant present in the regeneration section to the treatment section.

[11] The carbon dioxide treatment method according to any one of [8] to

[10] , wherein the amine compound is an aralkylamine.

[12] The carbon dioxide treatment method according to

[11] , wherein the amine compound contains two or more aminoalkyl groups.

[13] The carbon dioxide treatment method according to any one of [8] to

[12] , wherein the dispersant is silica particles.

[14] The carbon dioxide treatment method according to any one of [8] to

[13] , wherein the dispersant is colloidal silica. [Examples]

[0042] The present invention will be described in more detail below with reference to examples. However, the scope of the present invention is not limited to these examples. Unless otherwise specified, "%" means "mass%".

[0043] [Example 1] A treatment agent 21 was prepared, consisting of 50 mL of a 6% m-xylenediamine aqueous solution and 0.5 g of a dispersant (COMPOL80, colloidal silica, solid content concentration 40%, average particle size 72.0 nm, pH 10.2). This was then introduced into the processing unit 2 of the apparatus 1 shown in Figure 1. Next, carbon dioxide-containing gas (carbon dioxide / nitrogen (v / v) = 9 / 91) was bubbled into the treatment agent 21 at a rate of 50 mL / min for 240 minutes. The resulting solid was highly fluid, and it was easy to transfer the solid to the regeneration unit 3 by opening the opening / closing mechanism 41.

[0044] [Example 2] A solid was generated in the same manner as in Example 1, except that COMPOL120 (colloidal silica, solid content concentration 40%, average particle size 82.5 nm, pH 9.2) was used as a dispersant. The solid was highly fluid, and it was easy to transfer the solid to the regeneration unit 3 by opening the opening / closing mechanism 41.

[0045] [Comparative Example 1] A solid was generated in the same manner as in Example 1, except that a dispersant was not used. The solid was solidified and had low fluidity, so simply opening the opening / closing mechanism 41 was not enough to transfer the solid to the regeneration unit 3.

[0046] [Example 3] In Example 1, the solid material, dispersant, and a portion of the liquid component of the treatment agent 21 were transferred from the processing unit 2 to the regeneration unit 3. The solid material in the regeneration unit 3 was then heated using an oil bath. The heating temperature was set to 110°C, and the gas containing carbon dioxide generated by the heating was recovered from the recovery pipe. The carbon dioxide concentration of the recovered gas peaked 15 minutes after the start of heating and then gradually decreased.

[0047] As is clear from the above results, by including a dispersant in the treatment agent 21, the solidification of the solid 24 produced by the reaction between the amine compound and carbon dioxide can be suppressed, and as a result, the solid 24 can be easily separated from the amine compound before carbon dioxide absorption. [Explanation of symbols]

[0048] 1 device 2 Processing Units 3 Playback section 4 1st pipeline 5 2nd conduit 21 Treatment agent

Claims

1. A carbon dioxide treatment device for removing carbon dioxide from carbon dioxide-containing gases emitted from carbon dioxide emission facilities, The apparatus is capable of receiving the gas and comprises a processing unit containing an amine compound and a dispersant. The carbon dioxide treatment apparatus is characterized by a dispersant that has an effect of suppressing the caking of solids produced when the amine compound reacts with carbon dioxide.

2. The carbon dioxide processing apparatus according to claim 1, further comprising a regeneration unit that heats the solid containing the dispersant generated in the processing unit to generate carbon dioxide and the amine compound from the solid.

3. The system further comprises a conduit connecting the processing unit and the regeneration unit. The carbon dioxide treatment apparatus according to claim 2, wherein the pipeline is configured to allow the supply of the amine compound regenerated in the regeneration section and the dispersant present in the regeneration section to the treatment section.

4. The carbon dioxide treatment apparatus according to claim 1, wherein the amine compound is an aralkylamine.

5. The carbon dioxide treatment apparatus according to claim 4, wherein the amine compound comprises two or more aminoalkyl groups.

6. The carbon dioxide treatment apparatus according to claim 1, wherein the dispersant is silica particles.

7. The carbon dioxide treatment apparatus according to claim 1, wherein the dispersant is colloidal silica.

8. A carbon dioxide treatment method for removing carbon dioxide from carbon dioxide-containing gases emitted from carbon dioxide emission facilities, The method described above includes a first step of blowing the gas into a liquid phase containing an amine compound and a dispersant charged in a processing unit, and reacting the amine compound with carbon dioxide to produce a solid, A carbon dioxide treatment method wherein the dispersant has an effect of suppressing the solidification of the solid matter.

9. The carbon dioxide treatment method according to claim 8, further comprising a second step of heating the solid containing the dispersant generated in the first step in a regeneration unit to generate carbon dioxide and the amine compound from the solid.

10. The carbon dioxide treatment method according to claim 9, further comprising a third step of supplying the amine compound produced in the second step and the dispersant present in the regeneration section to the treatment section.

11. The carbon dioxide treatment method according to claim 8, wherein the amine compound is an aralkylamine.

12. The carbon dioxide treatment method according to claim 11, wherein the amine compound contains two or more aminoalkyl groups.

13. The carbon dioxide treatment method according to claim 8, wherein the dispersant is silica particles.

14. The carbon dioxide treatment method according to claim 8, wherein the dispersant is colloidal silica.

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