CO2 extraction and storage system

Abstract

Conventionally, CO2 absorbents such as isophorone diamine are used, and the CO2 absorption process at low temperatures and the CO2 extraction process at high temperatures are carried out in separate tanks. However, once the CO2 absorbent such as isophorone diamine absorbs CO2 and solidifies (changes into carbamic acid), it becomes difficult to move it to the other tank, which presents a problem. [Solution] Even when CO2 absorbents such as isophorone diamine absorb CO2 and solidify (change into carbamic acid), the system does not require movement. By creating a (medium to high) vacuum inside the tank, the amount of air inside the tank is reduced, and the concentration of CO2 extracted from the carbamic acid increases accordingly.

Description

Technical Field

[0001] The present invention relates to a technology that uses a CO₂ absorbent such as isophoronediamine to extract CO₂ from the air, increase the CO₂ concentration, and store CO₂ at high pressure in a storage tank. <Characteristics of Isophoronediamine (Liquid Phase)> · It can absorb and release CO₂ with high efficiency (when it absorbs CO₂, it changes to solid carbamic acid). · Since it has the property of being difficult to volatilize, even if it is continuously used, the amount to be replenished is small. · Since it releases CO₂ at a low temperature of 60°C, it can be sufficiently covered by energy such as solar heat, solar power generation, and geothermal energy. [[ID=q14]] · It can be repeatedly used while being circulated without wasting expensive materials. · It functions not only at a low concentration of several ppm of CO₂ but also at a high concentration of about 30%.

Background Art

[0002] Conventionally, a CO₂ absorbent such as isophoronediamine is used, and the CO₂ absorption process at low temperature and the process of extracting CO₂ at high temperature are carried out in separate tanks. Therefore, when a CO₂ absorbent such as isophoronediamine absorbs CO₂ and solidifies (changes to carbamic acid), there is a problem that it is difficult to transfer the solid carbamic acid to another tank.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Even if CO2 absorbents such as isophorone diamine absorb CO2 and solidify (change into carbamic acid), creating a (medium to high) vacuum inside the tank reduces the amount of air inside, thereby increasing the concentration of CO2 extracted from the carbamic acid. [Means for solving the problem]

[0005] Equipped with an intake pump (high-pressure pump) and an exhaust pump (vacuum pump), and with temperature control capabilities, a large tank containing a CO2 absorbent such as isophorone diamine is placed inside. In order to capture more CO2 (0.04%) from the air, atmospheric air is drawn into the large tank at high pressure, creating a low-temperature, high-pressure state. This allows more CO2 to be absorbed by the isophorone diamine (converted to carbamic acid). Then, the air is discharged using the exhaust pump (vacuum pump) (creating a vacuum), and the inside of the tank is then heated to a high temperature, separating and extracting CO2 from the carbamic acid, filling the large tank with a low concentration of CO2. The low-concentration CO2 is transferred to a small tank (which has the same structure as the large tank but is pre-vacuumed) (by connecting the exhaust pump (vacuum pump) of the large tank with the intake pump (compression pump) of the small tank), compressed, and left at low temperature to be absorbed by isophorone diamine (converted to carbamic acid). Then, the air is expelled using the exhaust pump (vacuum pump) (creating a vacuum), and the inside of the small tank is then heated to a high temperature, separating and extracting CO2 from the carbamic acid, and the small tank is filled with high-concentration CO2. Next, the exhaust pump (vacuum pump) of the small tank is connected to a CO2 high-pressure storage tank, and the high-concentration CO2 is stored in the CO2 high-pressure storage tank under high pressure. [Effects of the Invention]

[0006] By installing this system on a wooden artificial island, using the electricity generated by the wave power on the wooden artificial island, and deploying it on a large scale offshore, carbon neutrality can be achieved before 2050, even with the use of some fossil fuels. [Brief explanation of the drawing]

[0007] [Figure 1] Overview of the CO2 Extraction and Storage System [Modes for carrying out the invention]

[0008] Equipped with an intake pump (high-pressure pump) and an exhaust pump (vacuum pump), and with temperature control capabilities, a large tank containing a CO2 absorbent such as isophorone diamine is placed inside. In order to capture more CO2 (0.04%) from the air, atmospheric air is drawn into the large tank at high pressure, creating a low-temperature, high-pressure state. This allows more CO2 to be absorbed by the isophorone diamine (converted to carbamic acid). Then, the air is discharged using the exhaust pump (vacuum pump) (creating a vacuum), and the inside of the tank is then heated to a high temperature, separating and extracting CO2 from the carbamic acid, filling the large tank with a low concentration of CO2. The low-concentration CO2 is transferred to a small tank (which has the same structure as the large tank but is pre-vacuumed) (by connecting the exhaust pump (vacuum pump) of the large tank with the intake pump (compression pump) of the small tank), compressed, and left at low temperature to be absorbed by isophorone diamine (converted to carbamic acid). Then, the air is expelled using the exhaust pump (vacuum pump) (creating a vacuum), and the inside of the small tank is then heated to a high temperature, separating and extracting CO2 from the carbamic acid, and the small tank is filled with high-concentration CO2. Next, the exhaust pump (vacuum pump) of the small tank is connected to a CO2 high-pressure storage tank, and the high-concentration CO2 is stored in the CO2 high-pressure storage tank under high pressure.

[0009] In Figure 1, a CO2 extraction and storage system is provided, in which a large tank equipped with an intake pump and an exhaust pump and capable of temperature control is placed, containing a CO2 absorbent such as isophorone diamine, and in order to take in more CO2 from the air, the intake pump draws air into the large tank at high pressure, creating a low-temperature, high-pressure state, allowing more CO2 to be absorbed by the isophorone diamine and converted into solid-phase carbamic acid, and the exhaust pump discharges the air, creating a vacuum state, and then the inside of the large tank is heated to a high temperature, thereby separating and extracting CO2 from the carbamic acid, and the large tank is filled with a low concentration of CO2, and furthermore, the CO2 is stored in a container with the same structure as the large tank. A CO2 extraction and storage system is provided, wherein the exhaust pump of a large tank and the intake pump of the small tank are connected to a small tank that has been pre-vacuumed by the exhaust pump, the low-concentration CO2 is compressed and drawn into the small pump, the CO2 is absorbed by isophorone diamine and converted to carbamic acid by being left at a low temperature, the air is then discharged by the exhaust pump to create a vacuum, and then the inside of the small tank is heated to a high temperature, thereby separating and extracting CO2 from the carbamic acid, and the small tank is filled with high-concentration CO2, and the exhaust pump of the small tank is then connected to a high-pressure CO2 storage tank, and the high-concentration CO2 is stored in the high-pressure CO2 storage tank. [Industrial applicability]

[0010] By installing this system on a wooden artificial island, using the electricity generated by the wave power on the wooden artificial island, and deploying it on a large scale offshore, carbon neutrality can be achieved before 2050, even with the use of some fossil fuels.

Claims

[Claim 1] A CO2 extraction and storage system is provided, which includes an intake pump and an exhaust pump, and a large tank capable of temperature control, containing a CO2 absorbent such as isophorone diamine, and in order to take in more CO2 from the air, the intake pump draws air into the large tank at high pressure, creating a low-temperature, high-pressure state, allowing more CO2 to be absorbed by the isophorone diamine and converted into solid-phase carbamic acid, and the exhaust pump discharges the air, creating a vacuum state, and then the large tank is heated to a high temperature, thereby separating and extracting CO2 from the carbamic acid, and the large tank is filled with low-concentration CO2, and furthermore, the CO2 is removed from the large tank, which has the same structure as the exhaust pump, A CO2 extraction and storage system is provided in which, by connecting the exhaust pump of a large tank and the intake pump of the small tank to a small tank that has been pre-vacuumed by an air pump, low-concentration CO2 is compressed and drawn into the small pump, the CO2 is absorbed by isophorone diamine and converted to carbamic acid by being left at a low temperature, the air is then discharged by the exhaust pump to create a vacuum, and then the inside of the small tank is heated to a high temperature, thereby separating and extracting CO2 from the carbamic acid, and the small tank is filled with high-concentration CO2.

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