CO2 Extraction and Storage System

Abstract

Conventionally, CO2 absorbents such as isophoronediamine were used, and the low-temperature CO2 absorption process and the high-temperature CO2 extraction process were carried out in separate tanks. However, there was an issue that once the CO2 absorbent such as isophoronediamine absorbed the CO2 and solidified (converted into carbamic acid), it became difficult to move it to another tank. [Solution] This system does not require moving even if CO2 absorbents such as isophoronediamine absorb and solidify (convert into carbamic acid), and by creating a (medium to high) vacuum inside the tank, the amount of air inside the tank is reduced, thereby increasing the concentration of CO2 extracted from the carbamic acid.

Description

[Technical field]

[0001] The present invention proposes a technology that uses a CO2 absorbent such as isophoronediamine to extract CO2 from the air, increase the CO2 concentration, and store the CO2 under high pressure in a storage tank. <Characteristics of Isophoronediamine (liquid phase)> Highly efficient CO2 absorption and release (when CO2 is absorbed, it turns into solid carbamic acid) - It is less volatile, so you only need to add a small amount even if you use it continuously. Since CO2 is released at a low temperature of 60°C, it can be fully utilized with solar heat, photovoltaic power generation, and geothermal energy. · Expensive materials can be recycled and reused without waste. - It works not only with low concentrations of CO2 of a few ppm, but also with high concentrations of around 30%. [Background technology]

[0002] Conventionally, a CO2 absorbent such as isophoronediamine was used, and the low-temperature CO2 absorption process and the high-temperature CO2 extraction process were carried out in separate tanks. However, when the CO2 absorbent such as isophoronediamine absorbed CO2 and solidified (converted into carbamic acid), it became difficult to transfer the solid carbamic acid to another tank. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent application 2018-094876 Summary of the Invention [Problem to be solved by the invention]

[0004] Even if a CO2 absorbent such as isophoronediamine absorbs CO2 and solidifies (converts into carbamic acid), by creating a (medium to high) vacuum inside the tank, i.e., reducing the amount of air inside the tank, the concentration of CO2 extracted from the carbamic acid is increased accordingly. [Means for solving the problem]

[0005] Equipped with an intake pump (high-pressure pump) and an exhaust pump (vacuum pump), a large tank capable of temperature control is filled with CO2 absorbents such as isophoronediamine, and in order to capture as much CO2 (0.04%) from the air, air is sucked into the large tank at high pressure, creating a low-temperature, high-pressure state, and as much CO2 is absorbed by the isophoronediamine (converted into carbamic acid).The air is then exhausted (created a vacuum state) using an exhaust pump (vacuum pump), and the tank is then heated to a high temperature, separating and extracting the CO2 from the carbamic acid, filling the large tank with low-concentration CO2. The low-concentration CO2 is moved to a small tank (previously evacuated) of the same structure as the large tank (the exhaust pump (vacuum pump) is connected to the suction pump (compression pump) of the small tank), compressed, and left at low temperature to be absorbed by isophoronediamine (converted into carbamic acid).The air is then expelled (created a vacuum) using the exhaust pump (vacuum pump), and the small tank is then heated to a high temperature, separating and extracting the 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 under high pressure in the CO2 high-pressure storage tank. Effect of the Invention

[0006] By installing this system on a wooden artificial island and deploying it on a large scale out at sea, using electricity generated by wave power from the island, it would be possible to achieve carbon neutrality without having to wait until 2050, while still using some fossil fuels. [Brief description of the drawings]

[0007] [Figure 1] Overview of the CO2 Extraction and Storage System DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Equipped with an intake pump (high-pressure pump) and an exhaust pump (vacuum pump), a large tank capable of temperature control is filled with CO2 absorbents such as isophoronediamine, and in order to capture as much CO2 (0.04%) from the air, air is sucked into the large tank at high pressure, creating a low-temperature, high-pressure state, and as much CO2 is absorbed by the isophoronediamine (converted into carbamic acid).The air is then exhausted (created a vacuum state) using an exhaust pump (vacuum pump), and the tank is then heated to a high temperature, separating and extracting the CO2 from the carbamic acid, filling the large tank with low-concentration CO2. The low-concentration CO2 is moved to a small tank (previously evacuated) of the same structure as the large tank (the exhaust pump (vacuum pump) is connected to the suction pump (compression pump) of the small tank), compressed, and left at low temperature to be absorbed by isophoronediamine (converted into carbamic acid).The air is then expelled (created a vacuum) using the exhaust pump (vacuum pump), and the small tank is then heated to a high temperature, separating and extracting the 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 under high pressure in the CO2 high-pressure storage tank.

[0009] In FIG. 1, a CO2 extraction and storage system is provided that is equipped with an intake pump and an exhaust pump, and a CO2 absorbent such as isophorone diamine is placed in a large tank that can be temperature controlled. In order to capture more CO2 from the air, the intake pump uses high pressure to draw air into the large tank, creating a low temperature and high pressure state, allowing more CO2 to be absorbed by isophorone diamine and converted into solid carbamic acid. The exhaust pump uses a vacuum to exhaust the air, and the large tank is then heated to a high temperature, whereby CO2 is separated and extracted from the carbamic acid, and the large tank is filled with low concentration CO2. The CO2 extraction and storage system further comprises a storage tank having the same structure as the large tank, and a storage tank for storing CO2. A small tank that has already been evacuated by the exhaust pump is connected to the exhaust pump of the large tank and the suction pump of the small tank, so that the low concentration CO2 is compressed and sucked into the small pump, and the small tank is left to stand at low temperature to cause isophorone diamine to absorb the CO2 and convert it to carbamic acid.The air is then expelled by the exhaust pump to create a vacuum, and the small tank is then heated to a high temperature to separate and extract CO2 from the carbamic acid, and the small tank is filled with high concentration CO2.This is a CO2 extraction and storage system, and the exhaust pump of the small tank is then connected to a CO2 high-pressure storage tank, so that the high concentration CO2 can be stored at high pressure in the CO2 high-pressure storage tank. [Industrial Applicability]

[0010] By installing this system on a wooden artificial island and deploying it on a large scale out at sea, using electricity generated by wave power from the island, it would be possible to achieve carbon neutrality without having to wait until 2050, while still using some fossil fuels.

Claims

[Claim 1] A CO2 extraction and storage system that is equipped with an intake pump and an exhaust pump, and that contains a CO2 absorbent material made of isophorone diamine in a large tank that can be temperature controlled, and that uses the intake pump to draw air into the large tank at high pressure to create a low-temperature, high-pressure state and absorb more CO2 into the isophorone diamine, which can then be converted into solid carbamic acid, in order to capture more CO2 from the air. The exhaust pump uses the exhaust pump to exhaust air, creating a vacuum, and then the large tank is heated to a high temperature, whereby CO2 is separated and extracted from the carbamic acid, and the large tank is filled with low-concentration CO2. The CO2 extraction and storage system further uses a CO2 extractor that extracts the CO2 from the carbamic acid and converts it into a low-concentration CO2 gas. A CO2 extraction and storage system in which a small tank that has already been evacuated by an exhaust pump is connected to the exhaust pump of a large tank and the suction pump of the small tank, compressing and inhaling the low-concentration CO2 into the small tank, leaving it at low temperature to allow isophoronediamine to absorb the CO2 and convert it into carbamic acid, and then the air is expelled by the exhaust pump to create a vacuum, and the small tank is then heated to a high temperature to separate and extract CO2 from the carbamic acid, filling the small tank with high-concentration CO2. The exhaust pump of the small tank is then connected to a CO2 high-pressure storage tank, and the high-concentration CO2 can be stored at high pressure in the CO2 high-pressure storage tank.

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