Absorbent suitable for capturing CO2 through electrochemical mediation amine regeneration method and application

Abstract

The invention discloses an absorbent suitable for capturing CO2 by an electrochemical mediated amine regeneration method and application. The absorbent is prepared from organic amine, electrolyte and water, the organic amine comprises one or more of ethylenediamine, hydroxyethyl ethylenediamine, diethylenetriamine, triethylene tetramine, aminoethyl piperazine, benzylamine and N-methyldiethanolamine; the electrolyte is inorganic salt or organic salt; the inorganic salt electrolyte comprises one or more of sodium sulfate, potassium sulfate, sodium iodide, potassium iodide, sodium bromide, potassium bromide, magnesium sulfate, aluminum sulfate and zinc sulfate; and the organic salt electrolyte contains one or more of potassium glutamate, sodium glutamate, potassium glycinate, sodium glycinate, potassium alanine, sodium alanine, potassium sarcosine and sodium sarcosine. The concentrations of the organic amine and the electrolyte in the absorbent are 1-5 mo1 / kg and 0.2-1 mo1 / kg respectively. The absorbent has the characteristics of high stability, low corrosivity, large absorption capacity, stable absorption and desorption, good cycle performance and the like.

Description

Technical Field

[0001] This invention relates to the field of carbon dioxide capture and absorbent technology, specifically to an absorbent suitable for capturing CO2 using an electrochemically mediated amine regeneration method and its application. Background Technology

[0002] Currently, methods for capturing CO2 from low-partial-pressure flue gas include chemical absorption, solid-state adsorption, membrane separation, and cryogenic separation. Among these, chemical absorption is the most commonly chosen method for CO2 capture in CCUS projects due to its technological maturity and application prospects. Chemical absorption achieves CO2 separation from other gases by selectively reacting an absorbent with CO2 in the mixed flue gas. The reverse reaction is then used for regeneration, releasing high-purity CO2 for enrichment. However, chemical absorption absorbents have evolved through three generations. The first generation used single organic amines, resulting in a single composition and limited advantages. The second generation used composite amine absorbents, combining single organic amines to allow for customization based on flue gas properties, but these consumed more energy. The third generation used phase-change absorbents, which separate the CO2-rich phase after absorption, requiring only desorption of the CO2-rich phase, thus reducing regeneration energy consumption. However, the problem of absorbent escape remains unresolved.

[0003] Electrochemically mediated amine regeneration technology involves the formation of metal ions through anodic oxidation in a metal medium. These ions compete with CO2 and organic amines to form carbamates, occupying the CO2 sites within the carbamates to form metal-amine complexes, thereby releasing CO2. The desorbed CO2-poor solution is then transferred to the cathode cell, where the metal-amine complexes are reduced to elemental metals and deposited onto the cathode, achieving low-energy regeneration of the organic amines. Since aqueous solutions of organic amines typically have very low conductivity, current electrochemically mediated amine regeneration technologies usually require the addition of salts such as NaCl, KCl, NaNO3, and KNO3 to the anode and cathode electrolytes as additives to increase the ionic conductivity of the solution, reduce the resistance between the electrodes, and thus lower the cell voltage and energy consumption.

[0004] However, electrolytic cells are usually made of stainless steel, and solutions containing chlorine or nitrate can easily corrode stainless steel electrolytic cells during long-term use. In addition, there are few types of absorbents suitable for CO2 capture by electrochemically mediated amine regeneration, and there are problems such as unstable absorption and desorption, small absorption capacity, poor circulation performance, and insufficient stability. Summary of the Invention

[0005] The purpose of this invention is to provide an absorbent and its application suitable for CO2 capture by electrochemically mediated amine regeneration. This absorbent has the characteristics of high stability, low corrosivity, large absorption capacity, stable absorption and desorption, and good cycle performance.

[0006] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0007] An absorbent suitable for CO2 capture using an electrochemically mediated amine regeneration method is composed of water, an organic amine, and an electrolyte. The organic amine includes one or more of ethylenediamine, hydroxyethylethylenediamine, diethylenetriamine, triethylenetetramine, aminoethylpiperazine, benzylamine, and N-methyldiethanolamine, with a total amine concentration of 1–5 mol / kg in the absorbent. The electrolyte is an inorganic salt electrolyte or an organic salt electrolyte. The inorganic salt electrolyte includes one or more of sodium sulfate, potassium sulfate, sodium iodide, potassium iodide, sodium bromide, potassium bromide, magnesium sulfate, aluminum sulfate, and zinc sulfate. The organic salt electrolyte includes one or more of potassium glutamate, monosodium glutamate, potassium glycinate, sodium glycinate, potassium alanine, sodium alanine, potassium sarcosinate, and sodium sarcosinate. The concentration of the electrolyte in the absorbent is 0.2–1 mol / kg.

[0008] Preferably, the organic amine is composed of ethylenediamine, hydroxyethylethylenediamine, diethylenetriamine, triethylenetetramine, aminoethylpiperazine, benzylamine, and N-methyldiethanolamine in a molar ratio of 1:(0.5-2):(0.5-2):(0.5-2):(0.5-2):(0.5-2):(0.5-2):(0.5-2).

[0009] Preferably, the inorganic salt electrolyte is composed of sodium sulfate, potassium sulfate, sodium iodide, potassium iodide, sodium bromide, potassium bromide, magnesium sulfate, aluminum sulfate, and zinc sulfate in a molar ratio of 1:(1~2):(1~2):(1~2):(1~2):(1~2):(1~2):(1~2):(1~2):(1~2):(1~2).

[0010] Preferably, the organic salt electrolyte is composed of potassium glutamate, sodium glutamate, potassium glycine, sodium glycine, potassium alanine, sodium alanine, potassium sarcosinate, and sodium sarcosinate in a molar ratio of 1:1:1:1:2:1:1:1.

[0011] Preferably, the total amine concentration of the organic amine in the absorbent is 5 mol / kg; and the concentration of the electrolyte in the absorbent is 0.5 mol / kg.

[0012] To achieve the above-mentioned objectives, the present invention also provides the application of the absorbent suitable for CO2 capture by electrochemically mediated amine regeneration in CO2 capture and recovery, wherein the CO2 originates from flue gas from thermal power generation, steel and cement industries, and ship exhaust.

[0013] Preferably, the temperature for absorbing CO2 is 20–60°C, and the temperature for desorbing CO2 is 20–60°C.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] (1) In this invention, ethylenediamine (EDA), hydroxyethyl ethylenediamine (AEEA), diethylenetriamine (DETA), triethylenetetramine (TETA), aminoethylpiperazine (AEP), benzylamine (BZA), and N-methyldiethanolamine (MDEA) are selected as absorbents. Compared with ethanolamine (MEA), they have higher reaction rates, CO2 absorption rates, and absorption capacities. At the same time, they significantly improve the cathode Faraday efficiency, which is beneficial to the improvement of the metal recycling performance and recycling absorption capacity.

[0016] (2) In this invention, aminoethylpiperazine (AEP) and N-methyldiethanolamine (MDEA) contain tertiary amine groups, which can effectively reduce the resistance of the absorbent solution and improve the electrochemical performance of the absorbent in the CO2 desorption stage.

[0017] (3) In this invention, aminoethylpiperazine (AEP) and benzylamine (BZA) have stable cyclic structures, and have the advantages of low corrosivity and high stability, low corrosivity to carbon steel and stainless steel, low self-oxidative degradation rate, and small environmental impact.

[0018] (4) The electrolyte selected in this invention includes both organic and inorganic salts; the addition of electrolytes can significantly reduce the solution resistance and significantly reduce the corrosion rate of stainless steel compared to nitrates; at the same time, inorganic salt electrolytes can reduce the ammonia escape of organic amine absorbents.

[0019] (5) The absorbent prepared by the present invention has the characteristics of high stability, low corrosivity, stable absorption and desorption, large absorption capacity, good cycle performance, high metal utilization rate, and low energy consumption. Attached Figure Description

[0020] Figure 1 This is a flowchart illustrating the application method of the absorbent prepared in this invention. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present application.

[0022] Unless otherwise specified, all chemicals and reagents used in the following examples were commercially available. The gas source was simulated industrial flue gas (volume fraction: 15% CO2 + 85% N2). Both the anode and cathode used GBT2 copper electrodes, and the desorption current was 100 A / m. 2 .

[0023] Example 1

[0024] An absorbent suitable for CO2 capture using an electrochemically mediated amine regeneration method is provided, comprising a mixture of organic amine, electrolyte, and water. The organic amine consists of ethylenediamine (EDA), hydroxyethyl ethylenediamine (AEEA), diethylenetriamine (DETA), triethylenetetramine (TETA), aminoethylpiperazine (AEP), benzylamine (BZA), and N-methyldiethanolamine (MDEA) in a molar ratio of 1:1:1:1:1:1:1, with a total amine concentration of 5 mol / kg. The electrolyte is an inorganic salt electrolyte composed of sodium sulfate, potassium sulfate, sodium iodide, potassium iodide, sodium bromide, potassium bromide, magnesium sulfate, aluminum sulfate, and zinc sulfate in a molar ratio of 1:1:1:1:1:1:1:1:1:1, with a total electrolyte concentration of 0.5 mol / kg. The absorbent suitable for CO2 capture using an electrochemically mediated amine regeneration method is prepared by mixing and homogenizing the organic amine, electrolyte, and water.

[0025] Example 2

[0026] An absorbent suitable for CO2 capture using an electrochemically mediated amine regeneration method is provided, comprising a mixture of organic amine, electrolyte, and water. The organic amine consists of ethylenediamine (EDA), hydroxyethyl ethylenediamine (AEEA), diethylenetriamine (DETA), triethylenetetramine (TETA), aminoethylpiperazine (AEP), benzylamine (BZA), and N-methyldiethanolamine (MDEA) in a molar ratio of 1:2:1:1:1:1:1, with a total amine concentration of 5 mol / kg. The electrolyte is an inorganic salt electrolyte composed of sodium sulfate, potassium sulfate, sodium iodide, potassium iodide, sodium bromide, potassium bromide, magnesium sulfate, aluminum sulfate, and zinc sulfate in a molar ratio of 1:2:1:1:1:1:1:1:1, with a total electrolyte concentration of 0.5 mol / kg. The absorbent for CO2 capture using an electrochemically mediated amine regeneration method is prepared by mixing and homogenizing the organic amine, electrolyte, and water.

[0027] Example 3

[0028] An absorbent suitable for CO2 capture using an electrochemically mediated amine regeneration method is disclosed, comprising a mixture of organic amine, electrolyte, and water. The organic amine consists of ethylenediamine (EDA), hydroxyethyl ethylenediamine (AEEA), diethylenetriamine (DETA), triethylenetetramine (TETA), aminoethylpiperazine (AEP), benzylamine (BZA), and N-methyldiethanolamine (MDEA) in a molar ratio of 1:1:2:1:1:1:1, with a total amine concentration of 5 mol / kg. The electrolyte is an inorganic salt electrolyte composed of sodium sulfate, potassium sulfate, sodium iodide, potassium iodide, sodium bromide, potassium bromide, magnesium sulfate, aluminum sulfate, and zinc sulfate in a molar ratio of 1:1:2:1:1:1:1:1:1, with a total electrolyte concentration of 0.5 mol / kg. The absorbent for CO2 capture using an electrochemically mediated amine regeneration method is prepared by mixing and homogenizing the organic amine, electrolyte, and water.

[0029] Example 4

[0030] An absorbent suitable for CO2 capture using an electrochemically mediated amine regeneration method is provided, comprising a mixture of organic amine, electrolyte, and water. The organic amine consists of ethylenediamine (EDA), hydroxyethyl ethylenediamine (AEEA), diethylenetriamine (DETA), triethylenetetramine (TETA), aminoethylpiperazine (AEP), benzylamine (BZA), and N-methyldiethanolamine (MDEA) in a molar ratio of 1:1:1:2:1:1:1, with a total amine concentration of 5 mol / kg. The electrolyte is an inorganic salt electrolyte composed of sodium sulfate, potassium sulfate, sodium iodide, potassium iodide, sodium bromide, potassium bromide, magnesium sulfate, aluminum sulfate, and zinc sulfate in a molar ratio of 1:1:1:2:1:1:1:1:1, with a total electrolyte concentration of 0.5 mol / kg. The absorbent for CO2 capture using an electrochemically mediated amine regeneration method is prepared by mixing and homogenizing the organic amine, electrolyte, and water.

[0031] Example 5

[0032] An absorbent suitable for CO2 capture using an electrochemically mediated amine regeneration method is provided, comprising a mixture of organic amine, electrolyte, and water. The organic amine consists of ethylenediamine (EDA), hydroxyethylethylenediamine (AEEA), diethylenetriamine (DETA), triethylenetetramine (TETA), aminoethylpiperazine (AEP), benzylamine (BZA), and N-methyldiethanolamine (MDEA) in a molar ratio of 1:1:1:1:1:2:1:1, with a total amine concentration of 5 mol / kg. The electrolyte is an inorganic salt electrolyte composed of sodium sulfate, potassium sulfate, sodium iodide, potassium iodide, sodium bromide, potassium bromide, magnesium sulfate, aluminum sulfate, and zinc sulfate in a molar ratio of 1:1:1:1:1:2:1:1:1:1, with a total electrolyte concentration of 0.5 mol / kg. The absorbent for CO2 capture using an electrochemically mediated amine regeneration method is prepared by mixing and homogenizing the organic amine, electrolyte, and water.

[0033] Example 6

[0034] An absorbent suitable for CO2 capture using an electrochemically mediated amine regeneration method is disclosed, comprising a mixture of organic amine, electrolyte, and water. The organic amine consists of ethylenediamine (EDA), hydroxyethyl ethylenediamine (AEEA), diethylenetriamine (DETA), triethylenetetramine (TETA), aminoethylpiperazine (AEP), benzylamine (BZA), and N-methyldiethanolamine (MDEA) in a molar ratio of 1:1:1:1:1:2:1, with a total amine concentration of 5 mol / kg. The electrolyte is an inorganic salt electrolyte composed of sodium sulfate, potassium sulfate, sodium iodide, potassium iodide, sodium bromide, potassium bromide, magnesium sulfate, aluminum sulfate, and zinc sulfate in a molar ratio of 1:1:1:1:1:1:2:1:1:1, with a total electrolyte concentration of 0.5 mol / kg. The absorbent for CO2 capture using an electrochemically mediated amine regeneration method is prepared by mixing and homogenizing the organic amine, electrolyte, and water.

[0035] Example 7

[0036] An absorbent suitable for CO2 capture using an electrochemically mediated amine regeneration method is disclosed, comprising a mixture of organic amine, electrolyte, and water. The organic amine consists of ethylenediamine (EDA), hydroxyethyl ethylenediamine (AEEA), diethylenetriamine (DETA), triethylenetetramine (TETA), aminoethylpiperazine (AEP), benzylamine (BZA), and N-methyldiethanolamine (MDEA) in a molar ratio of 1:1:1:1:1:1:2, with a total amine concentration of 5 mol / kg. The electrolyte is an inorganic salt electrolyte composed of sodium sulfate, potassium sulfate, sodium iodide, potassium iodide, sodium bromide, potassium bromide, magnesium sulfate, aluminum sulfate, and zinc sulfate in a molar ratio of 1:1:1:1:1:1:1:2:1:1, with a total electrolyte concentration of 0.5 mol / kg. The absorbent for CO2 capture using an electrochemically mediated amine regeneration method is prepared by mixing and homogenizing the organic amine, electrolyte, and water.

[0037] Example 8

[0038] An absorbent suitable for CO2 capture using an electrochemically mediated amine regeneration method is provided, comprising a mixture of organic amine, electrolyte, and water. The organic amine consists of ethylenediamine (EDA), hydroxyethylethylenediamine (AEEA), diethylenetriamine (DETA), triethylenetetramine (TETA), aminoethylpiperazine (AEP), benzylamine (BZA), and N-methyldiethanolamine (MDEA) in a molar ratio of 1:1:1:1:1:2:1:1, with a total amine concentration of 5 mol / kg. The electrolyte is an inorganic salt electrolyte composed of sodium sulfate, potassium sulfate, sodium iodide, potassium iodide, sodium bromide, potassium bromide, magnesium sulfate, aluminum sulfate, and zinc sulfate in a molar ratio of 1:1:1:1:1:1:1:1:2:1, with a total electrolyte concentration of 0.5 mol / kg. The absorbent for CO2 capture using an electrochemically mediated amine regeneration method is prepared by mixing and homogenizing the organic amine, electrolyte, and water.

[0039] Example 9

[0040] An absorbent suitable for CO2 capture using an electrochemically mediated amine regeneration method is provided, comprising a mixture of organic amine, electrolyte, and water. The organic amine consists of ethylenediamine (EDA), hydroxyethyl ethylenediamine (AEEA), diethylenetriamine (DETA), triethylenetetramine (TETA), aminoethylpiperazine (AEP), benzylamine (BZA), and N-methyldiethanolamine (MDEA) in a molar ratio of 1:1:1:1:1:2:1:1, with a total amine concentration of 5 mol / kg. The electrolyte is an inorganic salt electrolyte composed of sodium sulfate, potassium sulfate, sodium iodide, potassium iodide, sodium bromide, potassium bromide, magnesium sulfate, aluminum sulfate, and zinc sulfate in a molar ratio of 1:1:1:1:1:1:1:1:1:2, with a total electrolyte concentration of 0.5 mol / kg. The absorbent for CO2 capture using an electrochemically mediated amine regeneration method is prepared by mixing and homogenizing the organic amine, electrolyte, and water.

[0041] Example 10

[0042] An absorbent suitable for CO2 capture using an electrochemically mediated amine regeneration method is disclosed, comprising a mixture of organic amine, electrolyte, and water. The organic amine consists of ethylenediamine (EDA), hydroxyethyl ethylenediamine (AEEA), diethylenetriamine (DETA), triethylenetetramine (TETA), aminoethylpiperazine (AEP), benzylamine (BZA), and N-methyldiethanolamine (MDEA) in a molar ratio of 1:1:2:1:1:1, with a total amine concentration of 5 mol / kg. The electrolyte is an organic salt electrolyte composed of potassium glutamate, sodium glutamate, potassium glycinate, sodium glycinate, potassium alanine, sodium alanine, potassium sarcosinate, and sodium sarcosinate in a molar ratio of 1:1:1:1:2:1:1:1, with a total electrolyte concentration of 0.5 mol / kg. The absorbent for CO2 capture using an electrochemically mediated amine regeneration method is prepared by mixing and homogenizing the organic amine, electrolyte, and water.

[0043] Example 11

[0044] An absorbent suitable for CO2 capture using an electrochemically mediated amine regeneration method is disclosed, comprising a mixture of organic amine, electrolyte, and water. The organic amine consists of ethylenediamine (EDA), hydroxyethyl ethylenediamine (AEEA), diethylenetriamine (DETA), triethylenetetramine (TETA), aminoethylpiperazine (AEP), benzylamine (BZA), and N-methyldiethanolamine (MDEA) in a molar ratio of 1:1:1:2:1:1:1, with a total amine concentration of 5 mol / kg. The electrolyte is an organic salt electrolyte composed of potassium glutamate, sodium glutamate, potassium glycinate, sodium glycinate, potassium alanine, sodium alanine, potassium sarcosinate, and sodium sarcosinate in a molar ratio of 1:1:1:1:2:1:1:1, with a total electrolyte concentration of 0.5 mol / kg. The absorbent for CO2 capture using an electrochemically mediated amine regeneration method is prepared by mixing and homogenizing the organic amine, electrolyte, and water.

[0045] Example 12

[0046] An absorbent suitable for CO2 capture using an electrochemically mediated amine regeneration method is disclosed, comprising a mixture of organic amine, electrolyte, and water. The organic amine consists of ethylenediamine (EDA), hydroxyethyl ethylenediamine (AEEA), diethylenetriamine (DETA), triethylenetetramine (TETA), aminoethylpiperazine (AEP), benzylamine (BZA), and N-methyldiethanolamine (MDEA) in a molar ratio of 2:1:1:1:1:1:1, with a total amine concentration of 5 mol / kg. The electrolyte is an organic salt electrolyte composed of potassium glutamate, sodium glutamate, potassium glycinate, sodium glycinate, potassium alanine, sodium alanine, potassium sarcosinate, and sodium sarcosinate in a molar ratio of 1:1:1:1:2:1:1:1, with a total electrolyte concentration of 0.5 mol / kg. The absorbent for CO2 capture using an electrochemically mediated amine regeneration method is prepared by mixing and homogenizing the organic amine, electrolyte, and water.

[0047] The absorbent solutions prepared in the above examples were tested according to the following experimental steps:

[0048] like Figure 1As shown, before the reaction begins, the absorbent is first absorbed by CO2 and then fed into the anode and cathode tanks to become anolyte and catholyte, respectively. The electrochemical workstation is started, and the anode tank undergoes desorption, while the cathode tank undergoes electrodeposition. During the reaction, the catholyte is pumped to the top of the absorption tower via a peristaltic pump for spraying, where it contacts the CO2-containing flue gas to absorb CO2, becoming a CO2-rich liquid stored at the bottom of the absorption tower. It is then transported to the anode tank via a peristaltic pump to become anolyte. Desorption occurs in the anode tank of the electrochemical desorption reactor, and the gas and liquid phases undergo CO2 stripping separation in a flash tank. The CO2 gas is separated from the system, while the liquid is pumped into the cathode tank of the electrochemical desorption reactor for electrodeposition, becoming a CO2-lean liquid, which serves as the absorbent for subsequent CO2 absorption reactions, forming a closed loop. The temperature for CO2 absorption is 20–60℃, and the temperature for CO2 desorption is also 20–60℃.

[0049] The desorption energy consumption (W, kJ / mol) is calculated as the ratio of actual electricity consumption to the molar amount of CO2 desorbed, and its expression is as follows: Equation I:

[0050]

[0051] In Equation I, t0 is the CO2 desorption time (s); U is the applied voltage (V); This represents the molar amount of CO2 desorbed.

[0052] The definitions of anode Faraday efficiency (AFE) and cathode Faraday efficiency (CFE) are shown in Equation II:

[0053]

[0054] In Equation II, Δm A It is the mass change (g) before and after desorption at the anode electrode; Δm C t0 is the mass change (g) before and after cathode electrode deposition; t0 is the CO2 desorption time (s); M Cu M is the molecular weight of Cu. Cu =63.5 g / mol; I is the applied current (A); F is the Faraday constant, F = 96485 C / mol.

[0055] The experimental results for capturing CO2 in exhaust gas, as shown in Table 1, are as follows:

[0056] Table 1. Experimental Results of CO2 Capture in Exhaust Gas

[0057]

[0058]

[0059] As shown in Table 1, the desorption energy consumption of the absorbent prepared in this invention is below 50 KJ / mol CO2, which significantly reduces desorption energy consumption compared to chemical absorption CO2 capture technology and electrochemically mediated amine regeneration technology. Furthermore, the absorbent prepared in this invention utilizes a low-corrosive electrolyte and an effective organic amine absorbent, effectively reducing the electrochemical resistance of the solution while maintaining good anodic Faraday efficiency. This results in a significant improvement in cathodic Faraday efficiency, enhances the recycling rate of the metal electrode, and maintains favorable conditions for subsequent CO2 reabsorption.

[0060] In summary, the highly stable and low-corrosive absorbent system of the present invention, applicable to the electrochemically mediated amine regeneration method for capturing CO2, has the characteristics of high stability, low corrosivity, stable absorption and desorption, large absorption capacity, good cycle performance, high metal utilization rate, and low energy consumption.

Claims

1. An absorbent suitable for CO2 capture using an electrochemically mediated amine regeneration method, characterized in that, It is composed of water, organic amines, and electrolytes; the organic amines include one or more of ethylenediamine, hydroxyethylethylenediamine, diethylenetriamine, triethylenetetramine, aminoethylpiperazine, benzylamine, and N-methyldiethanolamine, and the total amine concentration of organic amines in the absorbent is 1-5 mol / kg; the electrolyte is an inorganic salt electrolyte or an organic salt electrolyte, the inorganic salt electrolytes include one or more of sodium sulfate, potassium sulfate, sodium iodide, potassium iodide, sodium bromide, potassium bromide, magnesium sulfate, aluminum sulfate, and zinc sulfate; the organic salt electrolytes include one or more of potassium glutamate, monosodium glutamate, potassium glycinate, sodium glycinate, potassium alanine, sodium alanine, potassium sarcosinate, and sodium sarcosinate; the concentration of electrolytes in the absorbent is 0.2-1 mol / kg.

2. The absorbent for CO2 capture using an electrochemically mediated amine regeneration method according to claim 1, characterized in that, The organic amine is composed of ethylenediamine, hydroxyethylethylenediamine, diethylenetriamine, triethylenetetramine, aminoethylpiperazine, benzylamine, and N-methyldiethanolamine in a molar ratio of 1:(0.5~2):(0.5~2):(0.5~2):(0.5~2):(0.5~2):(0.5~2):(0.5~2).

3. The absorbent for capturing CO2 using an electrochemically mediated amine regeneration method according to claim 1, characterized in that, The inorganic salt electrolyte is composed of sodium sulfate, potassium sulfate, sodium iodide, potassium iodide, sodium bromide, potassium bromide, magnesium sulfate, aluminum sulfate, and zinc sulfate in a molar ratio of 1:(1~2):(1~2):(1~2):(1~2):(1~2):(1~2):(1~2):(1~2):(1~2):(1~2).

4. The absorbent for capturing CO2 using an electrochemically mediated amine regeneration method according to claim 1, characterized in that, The organic salt electrolyte is composed of potassium glutamate, sodium glutamate, potassium glycine, sodium glycine, potassium alanine, sodium alanine, potassium sarcosinate, and sodium sarcosinate in a molar ratio of 1:1:1:1:2:1:1:

1.

5. The absorbent for capturing CO2 using an electrochemically mediated amine regeneration method according to claim 1, characterized in that, The total amine concentration of organic amines in the absorbent is 5 mol / kg; the concentration of electrolytes in the absorbent is 0.5 mol / kg.

6. The application of an absorbent for capturing CO2 using an electrochemically mediated amine regeneration method as described in any one of claims 1-5 in CO2 capture and recovery, wherein the CO2 originates from flue gas from thermal power generation, steel and cement industries, and ship exhaust.

7. The application according to claim 6, characterized in that, The temperature range for CO2 absorption is 20–60℃, and the temperature range for CO2 desorption is also 20–60℃.

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