An amine absorbent with antioxidant degradation function and a preparation method thereof
By adding antioxidant degradation agents to the AEEA absorbent, the oxidative degradation problem of amine solution in the CO2 capture process was solved, the stability and absorption performance of the absorbent were improved, and the operating costs were reduced.
Patent Information
- Application Number
- CN202411967597.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2044-12-30
AI Technical Summary
Existing alcohol amine solutions are susceptible to oxidative degradation during the CO2 capture process, affecting absorption efficiency and stability and increasing operating costs.
AEEA absorbent is compounded with antioxidant degradation agent (such as ascorbic acid, bisphenol A, EDTA-2Na, diamylamine or a mixture of chitosan and thymol) to prepare amine absorbent with antioxidant degradation function, which slows down oxidative degradation by capturing free radicals and scavenging active substances.
The anti-oxidation and degradation performance of the AEEA absorbent was significantly improved, the service life was extended, the CO2 capture cost was reduced, the absorption performance was increased by 144.83%, and the desorption performance was increased by 50.94%.
Smart Images
Figure CN119548950B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of carbon dioxide capture, in particular to an amine absorbent with anti-oxidative degradation function and a preparation method thereof. BACKGROUND
[0002] Alcohol amine solution is the most mature carbon capture technology reagent at present, which has the advantages of large absorption rate and good effect. However, alcohol amine solution will be degraded under the action of O2 and high temperature during the absorption of CO2, which will cause damage and corrosion to the solvent itself and the equipment, and increase the operation cost.
[0003] AEEA (hydroxyethyl ethylenediamine) as a high-efficiency absorbent, has shown significant advantages in CO2 capture and removal. However, in practical application, AEEA absorbent may face the problem of oxidative degradation, which will affect its absorption efficiency and stability. Therefore, developing AEEA absorbent with anti-oxidative degradation function is of great significance to improve the stability and service life of AEEA absorbent. SUMMARY
[0004] The present application aims to provide an amine absorbent with anti-oxidative degradation function and a preparation method thereof. The preparation method is simple, and the prepared amine absorbent can have anti-oxidative degradation function, which can effectively slow down the degradation rate of the amine absorbent, prolong the service life of the amine absorbent, and reduce the capture cost of CO2.
[0005] To achieve the above-mentioned application purposes, the technical solutions adopted by the present application are as follows:
[0006] An amine absorbent with anti-oxidative degradation function comprises AEEA absorbent and an anti-oxidative degradation agent, the anti-oxidative degradation agent accounts for 0.1% of the mass fraction of the AEEA absorbent; the AEEA absorbent is prepared from AEEA and water; the anti-oxidative degradation agent is one of ascorbic acid, bisphenol A, EDTA-2Na, and dipentylamine; or the anti-oxidative degradation agent is a mixture of chitosan and thymol.
[0007] Preferably, the molar ratio between the chitosan and the thymol is 1:(0.5-2).
[0008] Preferably, the molar ratio between the chitosan and the thymol is 1:1.
[0009] Preferably, in the AEEA absorbent, the mass fraction of AEEA is 30%.
[0010] The application also provides a preparation method of the amine absorbent with the anti-oxidative degradation function. AEEA and water are mixed according to a proportion to obtain a 30wt% AEEA aqueous solution as the AEEA absorbent, then one of ascorbic acid, bisphenol A, EDTA-2Na and dipentylamine is selected as the anti-oxidative degradation inhibitor or the anti-oxidative degradation inhibitor is obtained by mixing chitosan and thymol according to a proportion, finally the anti-oxidative degradation inhibitor is added into the AEEA absorbent according to a formula amount to obtain the amine absorbent with the anti-oxidative degradation function.
[0011] The AEEA absorbent is a basic absorption liquid and is used for absorbing most of CO2 in flue gas, and the anti-oxidative degradation agent is used for protecting the 30wt% AEEA aqueous solution from oxidative degradation under the action of O2 and thermal degradation under high temperature.
[0012] Compared with the prior art, the application has the following beneficial effects:
[0013] The amine absorbent with the anti-oxidative degradation function prepared by the application has relatively stable absorption and desorption performances after the degradation cycle in the laboratory. When the CO2 is fully loaded, the degradation temperature is 120 DEG C and the O2 partial pressure is 1Mpa, compared with the non-degraded amine absorbent, the absorption performance of the blank group after two weeks of degradation is reduced by nearly 99.35% compared with that before degradation, and the desorption performance is reduced by nearly 90.75%. After adding 0.1vt% chitosan and thymol (molar ratio of 1:1) into the amine absorbent, the absorption and desorption performances of the AEEA absorbent after degradation are obviously higher than those of the blank group and other anti-oxidative degradation inhibitors, the absorption performance of the blank group can be increased by 144.83% at most, and the desorption performance can be increased by 50.94% at most. The anti-degradation effect can effectively reduce the degradation rate of AEEA, thereby increasing the service life of AEEA and reducing the CO2 capture cost. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 The degradation absorption and degradation desorption contrast diagrams of the absorbents prepared for the example 1 and the blank group for capturing and absorbing CO2 respectively; (a) degradation absorption contrast diagram; (b) degradation desorption contrast diagram
[0015] Figure 2 The degradation absorption and degradation desorption contrast diagrams of the absorbents prepared for the example 2 and the blank group for capturing and absorbing CO2 respectively; (a) degradation absorption contrast diagram; (b) degradation desorption contrast diagram
[0016] Figure 3 The degradation absorption and degradation desorption contrast diagrams of the absorbents prepared for the example 3 and the blank group for capturing and absorbing CO2 respectively; (a) degradation absorption contrast diagram; (b) degradation desorption contrast diagram
[0017] Figure 4 Comparison diagrams of degradation absorption and degradation desorption of the absorbent prepared for Example 4 and the blank group for capturing absorption of CO2; (a) degradation absorption comparison diagram; (b) degradation desorption comparison diagram;
[0018] Figure 5 Comparison diagrams of degradation absorption and degradation desorption of the absorbent prepared for Example 5 and the blank group for capturing absorption of CO2; (a) degradation absorption comparison diagram; (b) degradation desorption comparison diagram;
[0019] Figure 6 Comparison diagrams of degradation absorption and degradation desorption of the absorbent prepared for Example 6 and the blank group for capturing absorption of CO2; (a) degradation absorption comparison diagram; (b) degradation desorption comparison diagram;
[0020] Figure 7 Comparison diagrams of degradation absorption and degradation desorption of the absorbent prepared for Example 7 and the blank group for capturing absorption of CO2; (a) degradation absorption comparison diagram; (b) degradation desorption comparison diagram;
[0021] Figure 8 Comparison diagrams of degradation absorption and degradation desorption of the absorbent prepared for Example 8 and the blank group for capturing absorption of CO2; (a) degradation absorption comparison diagram; (b) degradation desorption comparison diagram.
[0022] Figure 9 Comparison diagrams of degradation absorption and degradation desorption of the absorbent prepared for Example 9 and the blank group for capturing absorption of CO2; (a) degradation absorption comparison diagram; (b) degradation desorption comparison diagram. DETAILED DESCRIPTION
[0023] The application will be further described in detail below in combination with specific examples.
[0024] Blank group
[0025] Different from the examples, the blank group does not include the antioxidant degradation agent. That is, 30wt% AEEA absorbent obtained by uniformly mixing AEEA and water is used as the amine absorbent of the blank group.
[0026] Example 1
[0027] The amine absorbent with antioxidant degradation function includes AEEA absorbent and antioxidant degradation agent, and the antioxidant degradation agent accounts for 0.1% of the mass fraction of the AEEA absorbent; the AEEA absorbent is prepared by AEEA and water, and the mass fraction of AEEA is 30%; and the antioxidant degradation agent is ascorbic acid.
[0028] The preparation method is as follows: first, uniformly mixing AEEA and water according to the ratio to obtain 30wt% AEEA absorbent; then adding ascorbic acid into the AEEA absorbent according to the formula amount to prepare the amine absorbent with the anti-oxidative degradation function.
[0029] The absorbents prepared in Example 1 and the blank group were subjected to anti-oxidative degradation and CO2 capture experiments according to the parameters in Tables 1 and 2, i.e., the anti-oxidative degradation experiment was carried out at a degradation pressure of 1.0 MPa and a kettle temperature of 120℃. The absorption experiment was carried out at a ventilation rate of 200 mL / min, and the desorption experiment was carried out at 130℃. Both the absorption experiment and the desorption experiment were carried out at normal pressure. The results are shown in Tables 3 and 4. Figure 1
[0030] As can be seen from Figure 1 , the CO2 absorption / desorption performance of the blank group and Example 1 decreased significantly with the extension of the degradation time. Compared with the blank group, the CO2 absorption / desorption amount of Example 1 was higher or approximately equal on the 6th, 10th and 14th days of degradation, and lower on the 3rd day of degradation. This is because in the initial stage of adding the anti-oxidative degradation inhibitor, there are already a large number of free radicals in the system, which can quickly initiate the oxidative degradation reaction. Although the anti-oxidative degradation inhibitor in Example 1 has the ability to capture free radicals, in the case of a large number of free radicals, the anti-oxidative degradation inhibitor cannot quickly and effectively capture all free radicals, resulting in general anti-degradation effect in the initial stage. In summary, the absorbent prepared in Example 1 has certain anti-oxidative degradation performance on the 6th, 10th and 14th days of degradation.
[0031] Table 1 Anti-oxidative degradation experiment parameters
[0032]
[0033] Table 2 CO2 capture purification experiment operation parameters
[0034]
[0035] Example 2
[0036] An amine absorbent with anti-oxidative degradation function comprises AEEA absorbent and anti-oxidative degradation agent, the anti-oxidative 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-oxidative degradation agent is bisphenol A.
[0037] The preparation method is consistent with that of 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 FIG. Figure 2 shown.
[0039] from Figure 2 It can be seen that the CO2 absorption / desorption performance of the blank group and Example 2 decreased 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 day of degradation was higher or approximately equal, while the CO2 absorption / desorption amount on the 3rd day of degradation was lower. This is because a large number of free radicals already exist 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 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 higher at the initial stage 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 day of degradation.
[0040] Example 3
[0041] An amine absorbent with anti-oxidation and degradation function comprises an AEEA absorbent and an antioxidant degradation agent, wherein the antioxidant degradation agent accounts for 0.1% by mass 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 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 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 FIG. 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 prolongation of the degradation time. Compared with the blank group, Example 3 has higher CO2 absorption amount at the 6th and 14th days of degradation, higher CO2 desorption amount at the 6th day of degradation, and lower CO2 absorption / desorption amount at other degradation times. This is because a large number of free radicals exist in the system at the initial stage of degradation, which can rapidly initiate oxidative degradation reaction. The anti-oxidative degradation inhibitor in Example 3 mainly acts as a metal ion chelating agent to reduce the content of metal ions in the solution, and indirectly plays an anti-degradation role by scavenging free radicals in the solution, and the generation of certain degradation products affects the CO2 absorption / desorption amount. In summary, Example 3 has certain anti-oxidative degradation performance at the 6th and 14th days of degradation.
[0045] Example 4
[0046] An amine absorbent with anti-oxidative degradation function, comprising an AEEA absorbent and an anti-oxidative degradation agent, the anti-oxidative degradation agent accounting 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-oxidative degradation agent is dipentylamine.
[0047] The preparation method is consistent with that of Example 1.
[0048] The absorbents prepared from Example 4 and the blank group are subjected to CO2 capture and anti-oxidative degradation experiments according to the parameters in Tables 1 and 2, and the experimental process is the same as that of Example 1. The CO2 capture experimental results are shown in Table 3. Figure 4
[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 prolongation of the degradation time. Compared with the blank group, Example 4 has higher or approximately equal CO2 absorption / desorption amount at the 6th and 14th days of degradation, and lower CO2 absorption / desorption amount at the 3rd and 10th days of degradation. This is because a large number of free radicals exist in the system at the initial stage of degradation, which can rapidly initiate oxidative degradation reaction, and the anti-oxidative degradation inhibitor in Example 4 has certain free radical capture ability, but its relatively simple alkylamine structure leads to relatively weak anti-oxidative degradation ability, resulting in general anti-degradation effect at the initial stage. The generation of certain degradation products during the degradation process can increase or decrease the CO2 absorption / desorption amount, and the anti-oxidative degradation inhibitor in Example 4 is continuously consumed during the degradation reaction, resulting in the decrease of the anti-oxidative degradation ability. In summary, Example 4 has certain anti-oxidative degradation performance at the 6th and 14th days of degradation.
[0050] Example 5
[0051] An amine absorbent with an antioxidant degradation function comprises an AEEA absorbent and an antioxidant degradation agent, wherein the antioxidant degradation agent accounts for 0.1% by mass 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 1:1.
[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 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 FIG. Figure 5 shown.
[0054] from Figure 5 As can be seen, the CO2 absorption / desorption performance of the blank control and Example 5 decreased significantly with increasing degradation time. Compared to the blank control, Example 5 exhibited higher CO2 absorption / desorption throughout the degradation cycle. This is because the antioxidant degradation inhibitor in Example 5 has a strong ability to capture free radicals, resulting in a strong anti-degradation effect throughout the degradation cycle. In summary, Example 5 exhibits strong antioxidant degradation capabilities throughout the entire degradation cycle.
[0055] Example 6
[0056] An amine absorbent with an antioxidant degradation function comprises an AEEA absorbent and an antioxidant degradation agent, wherein the antioxidant degradation agent accounts for 0.1% by mass 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 1:1.5.
[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 FIG. Figure 6 shown.
[0059] from Figure 6It can be seen that the CO2 absorption / desorption performance of the blank group and Example 6 decreased significantly with the prolongation of the degradation time. Compared with the blank group, Example 6 had higher CO2 absorption amount at the 6th and 14th days of degradation, lower CO2 absorption amount at the 3rd and 10th days of degradation, and higher CO2 desorption amount during the entire degradation period. This is because there are a large number of free radicals in the system at the initial stage of degradation, which can rapidly initiate oxidative degradation reactions. Although the anti-oxidative degradation inhibitor in Example 6 has a certain ability to capture free radicals, in the case of a large number of free radicals, the anti-oxidative degradation inhibitor cannot quickly and effectively capture all free radicals, resulting in general anti-degradation effect at the initial stage. In addition, the proportion of different antioxidant components in the mixture is adjusted, thereby weakening or eliminating the synergistic effect, resulting in a decrease in the anti-oxidative degradation ability. And the generation of some degradation products during the degradation process can increase or decrease the CO2 absorption / desorption amount. In summary, the anti-oxidative degradation ability of Example 6 is stronger at the 6th and 14th days of degradation.
[0060] Example 7
[0061] An amine absorbent with anti-oxidative degradation function, comprising an AEEA absorbent and an anti-oxidative degradation agent, the anti-oxidative degradation agent accounting 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-oxidative degradation agent is a mixture of chitosan and thymol with a molar ratio of 1.5:1.
[0062] The preparation method is consistent with that of Example 5.
[0063] The absorbents prepared from Example 7 and the blank group were subjected to CO2 capture and anti-oxidative degradation experiments according to the parameters in Tables 1 and 2, and the experimental process was the same as that in Example 1. The CO2 capture experiment results are shown in Figure 7 .
[0064] From Figure 7It can be seen that the CO2 absorption / desorption performance of the blank group and Example 7 decreased significantly with the prolongation of the degradation time. Compared with the blank group, Example 7 had higher CO2 absorption amount at the 6th and 14th days of degradation, lower CO2 absorption amount at the 3rd and 10th days of degradation, and higher or approximately equal CO2 desorption amount during the entire degradation period. This is because there are a large number of free radicals in the system at the initial stage of degradation, which can rapidly initiate oxidative degradation reactions. Although the anti-oxidative degradation inhibitor in Example 7 has a certain ability to capture free radicals, in the case of a large number of free radicals, the anti-oxidative degradation inhibitor cannot quickly and effectively capture all free radicals, resulting in general anti-degradation effect at the initial stage. In addition, the proportion of different antioxidant components in the mixture is adjusted, thereby weakening or eliminating the synergistic effect, resulting in a decrease in the anti-oxidative degradation ability. And the generation of some degradation products during the degradation process can increase or decrease the CO2 absorption / desorption amount. In summary, the anti-oxidative degradation ability of Example 7 is stronger at the 6th and 14th days of degradation.
[0065] Example 8
[0066] An amine absorbent with anti-oxidative degradation function, comprising an AEEA absorbent and an anti-oxidative degradation agent, the anti-oxidative degradation agent accounting 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-oxidative degradation agent is a mixture of chitosan and thymol with 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 anti-oxidative degradation experiments according to the parameters in Tables 1 and 2, and the experimental process was the same as that in Example 1. The CO2 capture experiment results are shown in Figure 8 .
[0069] From Figure 8It can be seen that the CO2 absorption / desorption performance of the blank group and Example 8 decreased significantly with the extension of the degradation time. Compared with the blank group, Example 8 had higher CO2 absorption amount at the 6th and 14th days of degradation, lower CO2 absorption amount at the 3rd and 10th days of degradation, and higher CO2 desorption amount at the 3rd, 6th and 14th days of degradation, and lower CO2 desorption amount at 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, which can rapidly initiate 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 general antioxidant degradation effect at the initial stage. In addition, due to the adjustment of the proportion 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 some degradation products during the degradation process can increase or decrease the CO2 absorption / desorption amount. In summary, the antioxidant degradation ability of Example 8 is stronger at the 6th and 14th days of degradation.
[0070] Example 9
[0071] An amine absorbent with antioxidant degradation function, comprising an AEEA absorbent and an antioxidant degradation agent, the antioxidant degradation agent accounting 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 antioxidant degradation agent is a mixture of chitosan and thymol with 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, and the experimental process was the same as that in Example 1. The results of the CO2 capture experiment are shown in Table 3. Figure 9
[0074] From Figure 9 It can be seen that the CO2 absorption / desorption performance of the blank group and Example 9 significantly decreases with the extension of the degradation time. Compared with the blank group, Example 9 has higher CO2 absorption amount at the 6th and 14th days of degradation, lower CO2 absorption amount at the 3rd and 10th days of degradation, and higher CO2 desorption amount during the entire degradation period. This is because a large number of free radicals exist in the system at the initial stage of degradation, which can rapidly initiate oxidative degradation reaction. 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 general antioxidant degradation effect at the initial stage. In addition, the proportion of different antioxidant components in the mixture is adjusted, thereby weakening or eliminating the synergistic effect, resulting in a decrease in antioxidant degradation capacity. And the generation of some degradation products during the degradation process can increase or decrease the CO2 absorption / desorption amount. In summary, the antioxidant degradation capacity of Example 9 is stronger at the 6th and 14th days of degradation.
[0075] In summary, the composite antioxidant degradation inhibitor (chitosan:thymol 1:1 physical mixture) prepared in the present application has antioxidant degradation function for AEEA, which reduces or blocks the free radical chain reaction by reacting with O2 or scavenging active free radicals in the solution, slows down the oxidative degradation reaction of AEEA absorbent under the action of high temperature and O2, reduces the degradation rate of AEEA, ensures the long-period smooth operation of AEEA absorbent, improves the service life of AEEA absorbent, and reduces the trapping cost. Compared with the blank control, the absorption and desorption performance of the amine absorbent prepared in the present application decreases by 99.35% and 90.75%, respectively, after two weeks of degradation at a degradation temperature of 120℃ and a degradation pressure of 1Mpa O2 partial pressure compared with that before degradation. The antioxidant degradation performance of the chitosan and thymol 1:1 physical mixture (molar ratio) is superior to that of other formulations, and the absorption performance can be increased by 144.83% and the desorption performance can be increased by 50.94% at most during the entire degradation period compared with the blank group, which well protects the AEEA absorbent.
Claims
1. An amine absorbent having an anti-oxidative degradation function, characterized in that: The invention 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; and 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 according to any one of claims 1 to 4, characterized in that: First, AEEA and water are mixed evenly according to a ratio to obtain a 30wt% AEEA aqueous solution as an AEEA absorbent, and then chitosan and thymol are mixed evenly according to a ratio to obtain an antioxidant degradation inhibitor; finally, the antioxidant degradation inhibitor is added to the AEEA absorbent according to the formula amount to prepare an amine absorbent with antioxidant degradation function.
Citation Information
Patent Citations
Nanoscale silicon dioxide deodorization composite film spraying agent as well as preparation method and application thereof
CN114713012A
Fragrance composition
US20090126644A1