Amine absorbent with oxidative degradation resistance function and preparation method thereof

Abstract

The invention relates to an amine absorbent with an oxidative degradation resistance function and a preparation method thereof, the amine absorbent comprises an AEA absorbent and an antioxidant degradation agent, and the antioxidant degradation agent accounts for 0.1% of the AEA absorbent by mass; the AEEA absorbent is prepared from AEEA and water; the antioxidant degradation agent is one of ascorbic acid, bisphenol A, EDTA-2Na (Ethylene Diamine Tetraacetic Acid) and diamylamine; or the antioxidant degradation agent is a mixture of chitosan and thymol. The preparation method comprises the following steps: uniformly mixing the AEEA and the water according to the ratio to obtain a 30wt% AEEA aqueous solution as an AEEA absorbent, and preparing an antioxidant degradation inhibitor; and finally, adding the antioxidant degradation inhibitor into the AEEA absorbent according to the formula ratio. The method is simple, the prepared amine absorbent can have an oxidative degradation resisting function, the degradation rate of the amine absorbent can be effectively reduced, the service life of the amine absorbent can be prolonged, and the capture cost of CO2 can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide capture, and in particular to an amine absorbent with an anti-oxidation and degradation function and a preparation method thereof. Background Art

[0002] Alcoholamine solution is the most mature carbon capture technology supporting reagent, which has the advantages of high absorption rate and good effect. However, during the CO2 absorption process, the alcoholamine solution will degrade under the action of O2 and high temperature, causing loss and corrosion to the solvent itself and equipment, and increasing operating costs.

[0003] AEEA (hydroxyethylethylenediamine) is a highly efficient absorbent that shows significant advantages in CO2 capture and removal. However, in practical applications, AEEA absorbents may face the problem of oxidative degradation, which will affect their absorption efficiency and stability. Therefore, the development of AEEA absorbents with anti-oxidative degradation function is of great significance for improving the stability and service life of AEEA absorbents. Summary of the invention

[0004] The purpose of the present invention is to provide an amine absorbent with anti-oxidation degradation function and a preparation method thereof. The preparation method is simple, and the prepared amine absorbent can have anti-oxidation degradation function, which can effectively slow down the degradation rate of the amine absorbent, extend the service life of the amine absorbent, and reduce the capture cost of CO2.

[0005] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is:

[0006] An amine absorbent with antioxidant degradation function comprises an AEEA absorbent and an antioxidant degradation agent, wherein the antioxidant degradation agent accounts for 0.1% of the mass fraction of the AEEA absorbent; the AEEA absorbent is prepared from AEEA and water; the antioxidant degradation agent is one of ascorbic acid, bisphenol A, EDTA-2Na, and diamylamine; or the antioxidant degradation agent is a mixture of chitosan and thymol.

[0007] Preferably, the molar ratio between chitosan and thymol is 1:(0.5-2).

[0008] Preferably, the molar ratio between chitosan and thymol is 1:1.

[0009] Preferably, in the AEEA absorbent, the mass fraction of AEEA is 30%.

[0010] The present invention also provides a method for preparing the above-mentioned amine absorbent with antioxidant degradation function, which comprises the following steps: firstly, AEEA and water are uniformly mixed according to a ratio to obtain a 30wt% AEEA aqueous solution as the AEEA absorbent, and then one of ascorbic acid, bisphenol A, EDTA-2Na, and diamylamine is selected as an antioxidant degradation inhibitor, or chitosan and thymol are uniformly mixed according to a ratio to obtain an antioxidant degradation inhibitor; finally, the antioxidant degradation inhibitor is added to the AEEA absorbent according to a formula amount to obtain the amine absorbent with antioxidant degradation function.

[0011] The AEEA absorbent in the present invention is the basic absorption liquid used to absorb most of the CO2 in the flue gas; the antioxidant degradation agent is used to protect the 30wt% AEEA aqueous solution to prevent oxidative degradation under the action of O2 and thermal degradation under high temperature.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The amine absorbent with antioxidant degradation function prepared by the present invention has relatively stable absorption and desorption performance after the laboratory degradation cycle. When fully loaded with CO2, the degradation temperature is 120°C, and the O2 partial pressure is 1Mpa, compared with the undegraded amine absorbent, the absorption performance of the blank group after 2 weeks of degradation is reduced by nearly 99.35% compared with the undegraded state, and the desorption performance is reduced by nearly 90.75%. After adding 0.1vt% chitosan and thymol (molar ratio of 1:1) to the amine absorbent, the absorption / desorption performance of AEEA is significantly higher than that of the blank group and other antioxidant degradation inhibitors. During the entire degradation cycle, the absorption performance can be increased by up to 144.83% compared with the blank group, and the desorption performance can be increased by up to 50.94%. The anti-degradation effect can effectively reduce the degradation rate of AEEA, thereby increasing the service life of AEEA and reducing the cost of CO2 capture. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Comparison diagram of degradation absorption and degradation desorption of the absorbent prepared in Example 1 and the blank group for capturing and absorbing CO2; (a) Degradation absorption comparison diagram; (b) Degradation desorption comparison diagram

[0015] Figure 2 Comparison diagram of degradation absorption and degradation desorption of the absorbent prepared in Example 2 and the blank group for capturing and absorbing CO2; (a) degradation absorption comparison diagram; (b) degradation desorption comparison diagram;

[0016] Figure 3 Comparison diagram of degradation absorption and degradation desorption of the absorbent prepared in Example 3 and the blank group for capturing and absorbing CO2; (a) degradation absorption comparison diagram; (b) degradation desorption comparison diagram;

[0017] Figure 4 Comparison diagram of degradation absorption and degradation desorption of the absorbent prepared in Example 4 and the blank group for capturing and absorbing CO2; (a) degradation absorption comparison diagram; (b) degradation desorption comparison diagram;

[0018] Figure 5 Comparison diagram of degradation absorption and degradation desorption of the absorbent prepared in Example 5 and the blank group for capturing and absorbing CO2; (a) degradation absorption comparison diagram; (b) degradation desorption comparison diagram;

[0019] Figure 6 Comparison diagram of degradation absorption and degradation desorption of the absorbent prepared in Example 6 and the blank group for capturing and absorbing CO2; (a) degradation absorption comparison diagram; (b) degradation desorption comparison diagram;

[0020] Figure 7 Comparison diagram of degradation absorption and degradation desorption of the absorbent prepared in Example 7 and the blank group for capturing and absorbing CO2; (a) degradation absorption comparison diagram; (b) degradation desorption comparison diagram;

[0021] Figure 8 Comparison diagrams of degradation absorption and degradation desorption of the absorbents prepared in Example 8 and the blank group for capturing and absorbing CO2; (a) degradation absorption comparison diagram; (b) degradation desorption comparison diagram.

[0022] Fig. 9 Comparison diagrams of degradation absorption and degradation desorption of the absorbents prepared in Example 9 and the blank group for capturing and absorbing CO2; (a) degradation absorption comparison diagram; (b) degradation desorption comparison diagram. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with specific embodiments.

[0024] Blank Group

[0025] The difference from the example is that no antioxidant degradation agent is included. That is, AEEA and water are uniformly mixed to obtain a 30 wt% AEEA absorbent as the amine absorbent of the blank group.

[0026] Example 1

[0027] An amine absorbent with anti-oxidation degradation function comprises an AEEA absorbent and an anti-oxidation degradation agent, wherein the anti-oxidation degradation agent accounts for 0.1% of the mass fraction of the AEEA absorbent; the AEEA absorbent is prepared from AEEA and water, wherein the mass fraction of AEEA is 30%; and the anti-oxidation degradation agent is ascorbic acid.

[0028] The preparation method is as follows: firstly, AEEA and water are uniformly mixed according to a ratio to obtain a 30wt% AEEA absorbent; then, ascorbic acid is added to the AEEA absorbent according to a formula amount to obtain an amine absorbent with an anti-oxidation degradation function.

[0029] The absorbents prepared in Example 1 and the blank group were subjected to antioxidant degradation and CO2 capture experiments according to the parameters in Tables 1 and 2, that is, the antioxidant degradation experiment was carried out at a degradation pressure of 1.0 MPa and a kettle temperature of 120°C. The absorption experiment was carried out at a ventilation rate of 200 mL / min, and the desorption experiment was carried out at 130°C. Both the absorption experiment and the desorption experiment were carried out at normal pressure. The results are shown in FIG. Figure 1 shown.

[0030] from Figure 1 It can be seen that the CO2 absorption / desorption performance of the blank group and Example 1 decreases significantly with the extension of the degradation time. Compared with the blank group, the CO2 absorption / desorption amount of Example 1 on the 6th, 10th and 14th day of degradation is higher or approximately equal, while the CO2 absorption / desorption amount on the 3rd day of degradation is lower. This is because in the early stage of adding the antioxidant degradation inhibitor, there are already a large number of free radicals in the system, and these free radicals will quickly trigger oxidative degradation reactions. Although the antioxidant degradation inhibitor in Example 1 has the ability to capture free radicals, when there are a large number of free radicals, the antioxidant degradation inhibitor cannot quickly and effectively capture all free radicals, resulting in a general initial anti-degradation effect. In summary, the absorbent prepared in Example 1 has certain antioxidant degradation performance on the 6th, 10th and 14th day of degradation.

[0031] Table 1 Antioxidant degradation experimental parameters

[0032]

[0033] Table 2 CO2 capture and purification experimental operating parameters

[0034]

[0035] Example 2

[0036] An amine absorbent with anti-oxidation degradation function comprises an AEEA absorbent and an anti-oxidation degradation agent, wherein the anti-oxidation degradation agent accounts for 0.1% of the mass fraction of the AEEA absorbent; the AEEA absorbent is prepared from AEEA and water, wherein the mass fraction of AEEA is 30%; and the anti-oxidation degradation agent is bisphenol A.

[0037] The preparation method is consistent with that in Example 1.

[0038] The absorbents prepared in Example 2 and the blank group were subjected to CO2 capture and antioxidant degradation experiments according to the parameters in Tables 1 and 2. The experimental process was the same as in Example 1. The CO2 capture experimental results are shown in Figure 2 shown.

[0039] from Figure 2 It can be seen that the CO2 absorption / desorption performance of the blank group and Example 2 decreases significantly with the extension of degradation time. Compared with the blank group, the CO2 absorption / desorption amount of Example 2 on the 6th, 10th and 14th days of degradation is higher or approximately equal, while the CO2 absorption / desorption amount on the 3rd day of degradation is lower. This is because there are a large number of free radicals in the system at the beginning of degradation, and these free radicals will quickly trigger oxidative degradation reactions. Although the antioxidant degradation inhibitor in Example 2 has the ability to capture free radicals, when there are a large number of free radicals, the antioxidant degradation inhibitor cannot quickly and effectively capture all free radicals, resulting in a general initial anti-degradation effect; in addition, since the solution pH is greater at the beginning of degradation, the solution pH continues to decrease as the degradation reaction proceeds, so that the antioxidant performance of the antioxidant degradation inhibitor in Example 2 is better exerted. In summary, the absorbent prepared in Example 2 has certain antioxidant degradation performance on the 6th, 10th and 14th days of degradation.

[0040] Example 3

[0041] An amine absorbent with anti-oxidation degradation function comprises an AEEA absorbent and an anti-oxidation degradation agent, wherein the anti-oxidation degradation agent accounts for 0.1% of the mass fraction of the AEEA absorbent; the AEEA absorbent is prepared from AEEA and water, wherein the mass fraction of AEEA is 30%; and the anti-oxidation degradation agent is EDTA-2Na.

[0042] The preparation method is consistent with that in Example 1.

[0043] The absorbents prepared in Example 3 and the blank group were subjected to CO2 capture and anti-oxidation degradation experiments according to the parameters in Tables 1 and 2. The experimental process was the same as in Example 1. The results of the CO2 capture experiment are shown in Figure 3 shown.

[0044] from Figure 3It can be seen that the CO2 absorption / desorption performance of the blank group and Example 3 decreases significantly with the extension of degradation time. Compared with the blank group, Example 3 has a higher CO2 absorption on the 6th and 14th days of degradation, and a higher CO2 desorption on the 6th day of degradation, while the CO2 absorption / desorption at other degradation times is lower. This is because there are already a large number of free radicals in the system at the initial stage of degradation, and these free radicals will quickly trigger oxidative degradation reactions. The antioxidant degradation inhibitor in Example 3 mainly acts as a metal ion chelator to reduce the metal ion content in the solution, and indirectly plays an anti-degradation role by removing free radicals in the solution, and the generation of certain degradation products affects the CO2 absorption / desorption. In summary, Example 3 has certain antioxidant degradation performance on the 6th and 14th days of degradation.

[0045] Example 4

[0046] An amine absorbent with anti-oxidation degradation function comprises an AEEA absorbent and an anti-oxidation degradation agent, wherein the anti-oxidation degradation agent accounts for 0.1% of the mass fraction of the AEEA absorbent; the AEEA absorbent is prepared from AEEA and water, wherein the mass fraction of AEEA is 30%; and the anti-oxidation degradation agent is diamylamine.

[0047] The preparation method is consistent with that in Example 1.

[0048] The absorbents prepared in Example 4 and the blank group were subjected to CO2 capture and antioxidant degradation experiments according to the parameters in Tables 1 and 2. The experimental process was the same as in Example 1. The results of the CO2 capture experiment are shown in Figure 4 shown.

[0049] from Figure 4 It can be seen that the CO2 absorption / desorption performance of the blank group and Example 4 decreases significantly with the extension of degradation time. Compared with the blank group, the CO2 absorption / desorption amount of Example 4 on the 6th and 14th days of degradation is higher or approximately equal, while the CO2 absorption / desorption amount on the 3rd and 10th days of degradation is lower. This is because there are a large number of free radicals in the system at the initial stage of degradation, which will quickly trigger oxidative degradation reactions, and the antioxidant degradation inhibitor in Example 4 has a certain ability to capture free radicals, but because of its relatively simple alkylamine structure, its ability in anti-oxidative degradation is relatively weak, resulting in a general initial anti-degradation effect. The generation of certain degradation products during the degradation process will increase or decrease the CO2 absorption / desorption amount, and as the degradation reaction proceeds, the antioxidant degradation inhibitor in Example 4 is continuously consumed, resulting in a decrease in the antioxidant degradation ability. In short, Example 4 has certain antioxidant degradation performance on the 6th and 14th days of degradation.

[0050] Example 5

[0051] An amine absorbent with anti-oxidation degradation function comprises an AEEA absorbent and an anti-oxidation degradation agent, wherein the anti-oxidation degradation agent accounts for 0.1% of the mass fraction of the AEEA absorbent; the AEEA absorbent is prepared from AEEA and water, wherein the mass fraction of AEEA is 30%; and the anti-oxidation degradation agent is a mixture of chitosan and thymol in a molar ratio of 1:1.

[0052] The preparation method comprises the following steps: firstly, AEEA and water are uniformly mixed according to a ratio to obtain a 30wt% AEEA absorbent; then, chitosan and thymol are uniformly mixed according to a ratio to obtain an antioxidant degradation inhibitor; and finally, the antioxidant degradation inhibitor is added to the AEEA absorbent according to a formula amount to obtain an amine absorbent with an antioxidant degradation function.

[0053] The absorbents prepared in Example 5 and the blank group were subjected to CO2 capture and antioxidant degradation experiments according to the parameters in Table 1 and Table 2. The experimental process was the same as in Example 1. The CO2 capture experimental results are shown in Figure 5 shown.

[0054] from Figure 5 It can be seen that the CO2 absorption / desorption performance of the blank group and Example 5 significantly decreases with the extension of the degradation time. Compared with the blank group, the CO2 absorption / desorption amount of Example 5 during the entire degradation period is higher. This is because the antioxidant degradation inhibitor in Example 5 has a strong ability to capture free radicals, so the anti-degradation effect during the entire degradation period is good. In summary, Example 5 has a strong antioxidant degradation ability throughout the degradation period.

[0055] Example 6

[0056] An amine absorbent with anti-oxidation degradation function comprises an AEEA absorbent and an anti-oxidation degradation agent, wherein the anti-oxidation degradation agent accounts for 0.1% of the mass fraction of the AEEA absorbent; the AEEA absorbent is prepared from AEEA and water, wherein the mass fraction of AEEA is 30%; the anti-oxidation degradation agent is a mixture of chitosan and thymol in a molar ratio of 1:1.5.

[0057] The preparation method is consistent with that of Example 5.

[0058] The absorbents prepared in Example 6 and the blank group were subjected to CO2 capture and antioxidant degradation experiments according to the parameters in Table 1 and Table 2. The experimental process was the same as in Example 1. The CO2 capture experimental results are shown in Figure 6 shown.

[0059] from Figure 6It can be seen that the CO2 absorption / desorption performance of the blank group and Example 6 decreases significantly with the extension of degradation time. Compared with the blank group, Example 6 has a higher CO2 absorption on the 6th and 14th days of degradation, a lower CO2 absorption on the 3rd and 10th days of degradation, and a higher CO2 desorption during the entire degradation cycle. This is because there are a large number of free radicals in the system at the beginning of degradation, which will quickly trigger oxidative degradation reactions. Although the antioxidant degradation inhibitor in Example 6 has a certain ability to capture free radicals, in the case of a large number of free radicals, the antioxidant degradation inhibitor cannot quickly and effectively capture all free radicals, resulting in a general initial anti-degradation effect; in addition, due to the adjustment of the ratio of different antioxidant components in the mixture, the synergistic effect is weakened or eliminated, resulting in a decrease in antioxidant degradation ability. And the generation of certain degradation products during the degradation process will increase or reduce the CO2 absorption / desorption. In summary, Example 6 has a strong antioxidant degradation ability on the 6th and 14th days of degradation.

[0060] Example 7

[0061] An amine absorbent with antioxidant degradation function comprises an AEEA absorbent and an antioxidant degradation agent, wherein the antioxidant degradation agent accounts for 0.1% of the mass fraction of the AEEA absorbent; the AEEA absorbent is prepared from AEEA and water, wherein the mass fraction of AEEA is 30%; and the antioxidant degradation agent is a mixture of chitosan and thymol in a molar ratio of 1.5:1.

[0062] The preparation method is consistent with that of Example 5.

[0063] The absorbents prepared in Example 7 and the blank group were subjected to CO2 capture and antioxidant degradation experiments according to the parameters in Tables 1 and 2. The experimental process was the same as in Example 1. The results of the CO2 capture experiment are shown in Figure 7 shown.

[0064] from Figure 7It can be seen that the CO2 absorption / desorption performance of the blank group and Example 7 decreases significantly with the extension of degradation time. Compared with the blank group, Example 7 has a higher CO2 absorption on the 6th and 14th days of degradation, a lower CO2 absorption on the 3rd and 10th days of degradation, and a higher or approximately equal CO2 desorption during the entire degradation cycle. This is because there are already a large number of free radicals in the system at the initial stage of degradation, and these free radicals will quickly trigger oxidative degradation reactions. Although the antioxidant degradation inhibitor in Example 7 has a certain ability to capture free radicals, in the case of a large number of free radicals, the antioxidant degradation inhibitor cannot quickly and effectively capture all free radicals, resulting in a general initial anti-degradation effect; in addition, due to the adjustment of the ratio of different antioxidant components in the mixture, the synergistic effect is weakened or eliminated, resulting in a decrease in antioxidant degradation ability. And the generation of certain degradation products during the degradation process will increase or reduce the CO2 absorption / desorption. In summary, Example 7 has a strong antioxidant degradation ability on the 6th and 14th days of degradation.

[0065] Example 8

[0066] An amine absorbent with anti-oxidation degradation function comprises an AEEA absorbent and an anti-oxidation degradation agent, wherein the anti-oxidation degradation agent accounts for 0.1% of the mass fraction of the AEEA absorbent; the AEEA absorbent is prepared from AEEA and water, wherein the mass fraction of AEEA is 30%; the anti-oxidation degradation agent is a mixture of chitosan and thymol in a molar ratio of 1:2.

[0067] The preparation method is consistent with that of Example 5.

[0068] The absorbents prepared in Example 8 and the blank group were subjected to CO2 capture and antioxidant degradation experiments according to the parameters in Tables 1 and 2. The experimental process was the same as in Example 1. The results of the CO2 capture experiment are shown in Figure 8 shown.

[0069] from Figure 8It can be seen that the CO2 absorption / desorption performance of the blank group and Example 8 decreases significantly with the extension of degradation time. Compared with the blank group, Example 8 has a higher CO2 absorption on the 6th and 14th days of degradation, a lower CO2 absorption on the 3rd and 10th days of degradation, and a higher CO2 desorption on the 3rd, 6th and 14th days of degradation, and a lower CO2 desorption on the 10th day of degradation. This is because there are a large number of free radicals in the system at the initial stage of degradation, and these free radicals will quickly trigger oxidative degradation reactions. Although the antioxidant degradation inhibitor in Example 8 has a certain ability to capture free radicals, in the case of a large number of free radicals, the antioxidant degradation inhibitor cannot quickly and effectively capture all free radicals, resulting in a general initial anti-degradation effect. In addition, due to the adjustment of the ratio of different antioxidant components in the mixture, the synergistic effect is weakened or eliminated, resulting in a decrease in antioxidant degradation ability. And the generation of certain degradation products during the degradation process will increase or reduce the CO2 absorption / desorption amount. In summary, Example 8 has a strong antioxidant degradation ability on the 6th and 14th days of degradation.

[0070] Example 9

[0071] An amine absorbent with anti-oxidation degradation function comprises an AEEA absorbent and an anti-oxidation degradation agent, wherein the anti-oxidation degradation agent accounts for 0.1% of the mass fraction of the AEEA absorbent; the AEEA absorbent is prepared from AEEA and water, wherein the mass fraction of AEEA is 30%; and the anti-oxidation degradation agent is a mixture of chitosan and thymol in a molar ratio of 2:1.

[0072] The preparation method is consistent with that of Example 5.

[0073] The absorbents prepared in Example 9 and the blank group were subjected to CO2 capture and antioxidant degradation experiments according to the parameters in Tables 1 and 2. The experimental process was the same as in Example 1. The results of the CO2 capture experiment are shown in Fig. 9 shown.

[0074] from Fig. 9It can be seen that the CO2 absorption / desorption performance of the blank group and Example 9 decreases significantly with the extension of degradation time. Compared with the blank group, Example 9 has a higher CO2 absorption on the 6th and 14th days of degradation, a lower CO2 absorption on the 3rd and 10th days of degradation, and a higher CO2 desorption during the entire degradation cycle. This is because there are a large number of free radicals in the system at the initial stage of degradation, and these free radicals will quickly trigger oxidative degradation reactions. Although the antioxidant degradation inhibitor in Example 9 has a certain ability to capture free radicals, in the case of a large number of free radicals, the antioxidant degradation inhibitor cannot quickly and effectively capture all free radicals, resulting in a general initial anti-degradation effect. In addition, due to the adjustment of the ratio of different antioxidant components in the mixture, the synergistic effect is weakened or eliminated, resulting in a decrease in antioxidant degradation ability. And the generation of certain degradation products during the degradation process will increase or reduce the CO2 absorption / desorption amount. In summary, Example 9 has a strong antioxidant degradation ability on the 6th and 14th days of degradation.

[0075] In summary, the composite anti-degradation inhibitor (chitosan: thymol 1:1 physical mixture) prepared by the present invention with anti-oxidative degradation function for AEEA reacts with O2 or removes active free radicals in the solution, reduces or blocks free radical chain reactions, slows down the oxidative degradation reaction of the AEEA absorbent under high temperature and O2, reduces the degradation rate of AEEA, ensures the long-term stable operation of the AEEA absorbent, improves the service life of the AEEA absorbent, and reduces the capture cost. Compared with the blank control, the blank group has a degradation temperature of 120°C and a degradation pressure of 1Mpa O2 partial pressure. After degradation for two weeks, the absorption and desorption performance of the blank group decreased by 99.35% and 90.75% respectively compared with the non-degraded state. The addition of chitosan and thymol 1:1 physical mixture (molar ratio) has excellent antioxidant degradation performance compared with other formulas. During the entire degradation cycle, the absorption performance can be increased by up to 144.83% compared with the blank group, and the desorption performance can be increased by up to 50.94%, which well protects the AEEA absorbent.

Claims

1. An amine absorbent having an anti-oxidative degradation function, characterized in that: It comprises an AEEA absorbent and an antioxidant degradation agent, wherein the antioxidant degradation agent accounts for 0.1% of the mass fraction of the AEEA absorbent; The AEEA absorbent is prepared from AEEA and water; The antioxidant degradation agent is one of ascorbic acid, bisphenol A, EDTA-2Na and diamylamine; or the antioxidant degradation agent is a mixture of chitosan and thymol.

2. The amine absorbent with anti-oxidative degradation function according to claim 1, characterized in that: The molar ratio of chitosan to thymol is 1:(0.5-2).

3. The amine absorbent with anti-oxidative degradation function according to claim 2, characterized in that: The molar ratio of chitosan to thymol is 1:

1.

4. The amine absorbent with anti-oxidative degradation function according to claim 1 or 2, characterized in that: In the AEEA absorbent, the mass fraction of AEEA is 30%.

5. A method for preparing an amine absorbent having an anti-oxidative degradation function as claimed in any one of claims 1 to 4, characterized in that: First, AEEA and water are uniformly mixed according to a ratio to obtain a 30wt% AEEA aqueous solution as an AEEA absorbent, and then one of ascorbic acid, bisphenol A, EDTA-2Na, and diamylamine is selected as an antioxidant degradation inhibitor, or chitosan and thymol are uniformly mixed according to a ratio to obtain an antioxidant degradation inhibitor; finally, the antioxidant degradation inhibitor is added to the AEEA absorbent according to a formula amount to prepare an amine absorbent with antioxidant degradation function.

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