A modified resin carbon dioxide capturing agent, and a preparation method and a regeneration method thereof

Abstract

The present application relates to carbon capture and storage technology field, especially to a kind of modified resin carbon dioxide capture agent and its preparation method and regeneration method, comprising the following weight parts of raw materials: urea formaldehyde resin 2-10 parts, cysteine 0.5-2 parts, chitosan 1-5 parts, gelatin 5-15 parts, titanium dioxide 0.5-2 parts and N-hydroxyethyl piperazine 4-8 parts.The modified resin carbon dioxide capture agent obtained by careful design of raw material combination and interaction, its internal abundant active site and pore structure significantly improve its carbon dioxide adsorption capacity;At the same time, it not only has good anti-UV aging ability, but also can catalyze the decomposition of NO X Reduce its damage to resin, so that the resin can maintain good performance stability during long-term use;Finally, the interaction of various components in the resin makes the modified resin form a strong anti-interference structure, and this structure can make the modified resin still maintain good capture performance in complex environment.

Description

Technical Field

[0001] This invention relates to the field of carbon capture, utilization and storage, and in particular to a modified resin carbon dioxide capture agent and its preparation and regeneration methods. Background Technology

[0002] With the increasing severity of global climate change, reducing greenhouse gas emissions, especially carbon dioxide (CO2) emissions, has become a focus of international attention. Carbon capture, utilization and storage (CCUS) technology, as an important means of emission reduction, is of great significance for promoting the green transformation of the energy structure and fostering sustainable economic and social development.

[0003] CCUS technology encompasses the entire chain from CO2 capture at the source, transportation, utilization, to final secure storage. CO2 capture, as the primary link in this chain, directly impacts the efficiency and cost of subsequent utilization and storage. Traditional CO2 capture methods, such as chemical absorption and physical adsorption, while achieving effective CO2 capture to some extent, generally suffer from high energy consumption, difficulties in material regeneration, and high costs, limiting their large-scale commercial application. Therefore, developing novel, efficient, and economical CO2 capture materials has become a current research hotspot.

[0004] In recent years, resin materials have shown great potential in the field of gas separation and capture due to their excellent processability, high specific surface area, and tunable chemical properties. In particular, chemical modification can significantly enhance the selective adsorption capacity of resin materials for specific gases, providing a new approach for achieving efficient and low-cost CO2 capture. Modified resins can capture CO2 not only through physical adsorption but also through chemical bonding to achieve even higher capture efficiency. Furthermore, under certain designs, the adsorbent can be recycled and regenerated, greatly reducing operating costs.

[0005] However, while modified resins have shown great potential in carbon dioxide capture, the following problems still exist:

[0006] 1. High cost: Its preparation process often involves complex chemical modification steps and high-cost raw materials, resulting in high overall cost and limiting the competitiveness of modified resins in large-scale commercial applications.

[0007] 2. Regeneration difficulties: Some modified resins are difficult to regenerate effectively after capturing carbon dioxide. The regeneration process may require high temperature, high pressure, or special chemical reagents, which not only increases operating costs but may also cause secondary pollution to the environment;

[0008] 3. Limited selectivity: Although the selective adsorption capacity of modified resins for carbon dioxide can be improved through chemical modification, in practical applications, they may still be affected by other gases (such as nitrogen, oxygen, etc.), resulting in less than ideal selectivity.

[0009] 4. Insufficient stability: Some modified resins may experience performance degradation due to chemical degradation, physical wear, etc. during long-term use, which will affect their stability and service life.

[0010] In view of this, the present invention is proposed. Summary of the Invention

[0011] The purpose of this invention is to provide a modified resin carbon dioxide capture agent and its preparation and regeneration methods. The modified resin carbon dioxide capture agent of this invention has excellent carbon dioxide adsorption performance, anti-aging performance and anti-interference performance.

[0012] In a first aspect, the present invention provides a modified resin carbon dioxide scavenger, comprising the following raw materials in parts by weight:

[0013] The ingredients are 2-10 parts urea-formaldehyde resin, 0.5-2 parts cysteine, 1-5 parts chitosan, 5-15 parts gelatin, 0.5-2 parts titanium dioxide, and 4-8 parts N-hydroxyethylpiperazine.

[0014] As a preferred embodiment of this technical solution, the chitosan is acid-soluble chitosan.

[0015] Acid-soluble chitosan, due to its optimized molecular structure and exposed active groups, can more effectively adsorb carbon dioxide. Therefore, using acid-soluble chitosan in combination with other components can significantly improve the carbon dioxide capture capacity of modified resins. Furthermore, while chitosan itself has a certain adsorption capacity for various substances, acid-soluble chitosan exhibits strong selective adsorption of carbon dioxide. Thus, choosing acid-soluble chitosan can effectively reduce interference from other gases during the adsorption process. Finally, mixing acid-soluble chitosan with other resin components can enhance the overall stability of the capture agent, maintaining stable capture performance over a wide range of temperature and humidity conditions.

[0016] As a preferred embodiment of this technical solution, the gelatin is food-grade gelatin.

[0017] First, using food-grade gelatin in modified resin carbon dioxide scavengers ensures the safety of the scavenger and avoids harm to humans and the environment during use. Second, food-grade gelatin has good compatibility, which helps improve the overall performance and stability of the scavenger, thus maintaining a stable scavenging effect during use. Food-grade gelatin also has excellent foaming properties, forming a large number of microbubbles in the scavenger. These bubbles not only increase the porosity of the scavenger and improve its carbon dioxide adsorption capacity, but also make the scavenger more fluffy and easier to handle during use. Food-grade gelatin contains abundant amino groups, which can interact with carbon dioxide, improving the adsorption efficiency and selectivity of the scavenger. At the same time, amino groups can also react with other active groups (such as carboxyl and hydroxyl groups) to form cross-linked structures, further enhancing the stability and durability of the scavenger. Finally, as a natural polymer compound, food-grade gelatin has good biocompatibility and biodegradability, which not only reduces environmental pollution but also enables resource recycling.

[0018] As a preferred embodiment of this technical solution, the titanium dioxide has a particle size of 0.2-0.4 μm, and industrial-grade titanium dioxide can be directly selected.

[0019] Titanium dioxide with a particle size of 0.2-0.4 μm has an extremely high specific surface area, providing more adsorption sites and thus improving the adsorption capacity of the trap for carbon dioxide. Simultaneously, using titanium dioxide of a specific particle size allows for the regulation of the macroporous structure of the polymer, resulting in a polymer adsorbent matrix with a uniform pore structure. This facilitates the diffusion and transport of carbon dioxide molecules, thereby increasing the adsorption rate and amount of the trap. Furthermore, titanium dioxide can form a relatively uniform network covering on the surface of the polymer pores, further improving the adsorption / desorption cycle stability of the material, thereby extending the lifespan of the trap and reducing replacement costs. Finally, selecting industrial-grade titanium dioxide as a raw material can also reduce production costs and simplify the production process.

[0020] Specifically, the active free radicals generated by TiO2 under ultraviolet light can effectively catalytically oxidize nitrogen oxides to NO3. - Similarly, it can catalytically oxidize sulfur oxides to sulfates; therefore, the introduction of TiO2 can reduce SO2 levels. X NO X Competitive adsorption of CO2. Furthermore, resins and gelatin exposed outdoors are susceptible to aging due to ultraviolet radiation, while the introduction of TiO2 can block or absorb ultraviolet rays, extending the overall service life.

[0021] As a preferred embodiment of this technical solution, the modified resin carbon dioxide scavenger of the present invention comprises the following raw materials in parts by weight:

[0022] The ingredients are: 4-6 parts urea-formaldehyde resin, 0.5-2 parts cysteine, 2-4 parts chitosan, 8-12 parts gelatin, 0.5-2 parts titanium dioxide, and 4-8 parts N-hydroxyethylpiperazine.

[0023] Secondly, the present invention also discloses a method for preparing the above-mentioned modified resin carbon dioxide scavenger, specifically including the following steps:

[0024] S1. Immediately add cysteine ​​to the aqueous solution of urea-formaldehyde resin, allow it to react fully, and obtain a mixed solution;

[0025] S2. Add chitosan to the mixed solution in step S1 and dissolve it completely to obtain a modified solution;

[0026] S3. Immediately add titanium dioxide to the modified solution in step S2 and stir thoroughly to obtain a mixed suspension.

[0027] S4. Add gelatin and N-hydroxyethylpiperazine sequentially to the mixed suspension in step S3, and stir thoroughly to obtain the modified resin;

[0028] S5. The modified resin is heated and molded to obtain a modified resin carbon dioxide scavenger.

[0029] In the preparation method of this invention, firstly, cysteine ​​is immediately added to an aqueous solution of urea-formaldehyde resin to ensure sufficient contact and reaction between cysteine ​​and urea-formaldehyde resin, forming a stable chemical bond, thereby improving the overall performance of the trap. Next, chitosan is added to the mixed solution and fully dissolved to further increase the adsorption sites of the trap, and the unique chemical structure of chitosan is acid-soluble to improve the selective adsorption capacity of the trap for carbon dioxide. Then, titanium dioxide is added to the modified solution and stirred thoroughly to form a stable suspension, providing a good foundation for subsequent molding and adsorption processes. Furthermore, the foaming properties of gelatin are introduced to allow air to smoothly enter the resin interior, while N-hydroxyethylpiperazine is used to adjust the overall liquid resin to a weakly alkaline state, further improving the adsorption capacity for carbon dioxide. Finally, the prepared modified resin can be either filled and molded according to a mold or applied to the desired working environment to capture carbon dioxide.

[0030] Therefore, the preparation method of the modified resin carbon dioxide scavenger of this invention does not require harsh conditions such as high temperature and high pressure, reducing energy consumption and safety hazards. Furthermore, each step is relatively simple and easy to control. Thus, this method is suitable for large-scale industrial production and can meet the needs of various fields for carbon dioxide scavengers.

[0031] As a preferred embodiment of this technical solution, in step S1, the mass ratio of urea-formaldehyde resin to water in the aqueous solution of urea-formaldehyde resin is 1:(2-4).

[0032] As a preferred embodiment of this technical solution, in step S4, N-hydroxyethylpiperazine is added to adjust the pH of the system to 8-9.

[0033] As a preferred embodiment of this technical solution, in step S5, during the heating and molding process, the temperature is controlled at 50-70℃ and the time is 2-4 hours. After heating is completed, the mixture is cooled to room temperature to obtain the modified resin carbon dioxide scavenger.

[0034] Finally, the present invention also discloses a method for regenerating the above-mentioned modified resin carbon dioxide scavenger, specifically: the exhausted modified resin carbon dioxide scavenger is treated at 70-90℃ for 5-15 minutes to obtain the regenerated modified resin carbon dioxide scavenger.

[0035] This invention regenerates the exhausted trap by treating it at 70-90℃ for 5-15 minutes. This temperature range and time duration are gentler than traditional high-temperature regeneration methods (such as the MEA amine washing method, which requires desorption at 100-150℃). Furthermore, it eliminates the need for complex chemical reagents or cumbersome procedures, reducing both operational difficulty and potential pollution and waste during regeneration. The regenerated trap retains high adsorption efficiency and can be recycled multiple times, effectively extending its lifespan.

[0036] The modified resin carbon dioxide scavenger of the present invention has at least the following beneficial effects:

[0037] The modified resin carbon dioxide trap of the present invention comprises the following raw materials in parts by weight: 2-10 parts urea-formaldehyde resin, 0.5-2 parts cysteine, 1-5 parts chitosan, 5-15 parts gelatin, 0.5-2 parts titanium dioxide, and 4-8 parts N-hydroxyethylpiperazine. Firstly, urea-formaldehyde resin has good viscosity and easy processability, and is relatively inexpensive, making it an ideal matrix for preparing the trap. Furthermore, urea-formaldehyde resin releases formaldehyde during its preparation process, and formaldehyde can react with the amino group in cysteine, thereby immobilizing the cysteine ​​and preventing its loss in subsequent steps. Cysteine ​​is an amino acid containing both amino and carboxyl groups; it not only reacts with formaldehyde in urea-formaldehyde resin but also undergoes esterification with chitosan. In addition, the presence of amino and carboxyl groups in cysteine ​​increases the active sites of the resin, enhancing its adsorption capacity for carbon dioxide. Chitosan, a natural polymer, is also rich in amino and hydroxyl groups. Its cross-linked structure, formed by esterification with the carboxyl groups of cysteine, not only enhances the mechanical strength of the resin but also introduces amino groups, improving the adsorption efficiency of carbon dioxide. Titanium dioxide, as an excellent photocatalyst, can effectively catalyze NO… XThe decomposition of titanium dioxide reduces its damage to the resin, thus extending its service life. Simultaneously, titanium dioxide possesses excellent UV resistance, significantly improving the resin's resistance to UV aging outdoors. Gelatin's foaming properties increase the resin's internal porosity, facilitating air (including carbon dioxide) entry and enhancing adsorption efficiency. N-hydroxyethylpiperazine, as a regulator, adjusts the overall liquid resin to a weakly alkaline environment, which is beneficial for carbon dioxide absorption and fixation. Therefore, the amino groups in gelatin, combined with N-hydroxyethylpiperazine, further enhance the resin's adsorption capacity for carbon dioxide.

[0038] Therefore, through a carefully designed combination and interaction of raw materials, the modified resin carbon dioxide scavenger obtained in this invention exhibits significantly enhanced adsorption capacity for carbon dioxide due to its abundant active sites and porous structure; simultaneously, it not only possesses excellent resistance to UV aging but also catalyzes NO… X The decomposition of the resin reduces its damage to the resin, allowing the resin to maintain good performance stability during long-term use. Finally, the interaction of various components in the resin results in the modified resin forming a structure with strong anti-interference properties, which enables the modified resin to maintain good collection performance in complex environments. Detailed Implementation

[0039] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0040] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application. As used herein, the singular form includes the plural form unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this description, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0041] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Example 1

[0043] In this embodiment, the modified resin carbon dioxide scavenger comprises the following raw materials in parts by weight:

[0044] 2 parts urea-formaldehyde resin, 0.5 parts cysteine, 1 part acid-soluble chitosan, 5 parts food-grade gelatin, 0.5 parts industrial-grade titanium dioxide, and 4-8 parts N-hydroxyethylpiperazine.

[0045] The preparation method of the modified resin carbon dioxide scavenger in this embodiment includes the following steps:

[0046] S1. Dissolve urea-formaldehyde resin in water at twice the weight of urea-formaldehyde resin, then immediately add cysteine ​​to the aqueous solution of urea-formaldehyde resin and allow it to react fully to obtain a mixed solution.

[0047] S2. Add chitosan to the mixed solution in step S1 and dissolve it completely to obtain a modified solution;

[0048] S3. Immediately add titanium dioxide to the modified solution in step S2 and stir thoroughly to obtain a mixed suspension.

[0049] S4. Add gelatin to the mixed suspension in step S3, then adjust the pH of the system to 8-9 using N-hydroxyethylpiperazine, and stir thoroughly to obtain the modified resin.

[0050] S5. The modified resin is heated at 50°C for 4 hours and then cooled to room temperature to obtain the modified resin carbon dioxide scavenger.

[0051] Example 2

[0052] In this embodiment, the modified resin carbon dioxide scavenger comprises the following raw materials in parts by weight:

[0053] 10 parts urea-formaldehyde resin, 2 parts cysteine, 5 parts acid-soluble chitosan, 15 parts food-grade gelatin, 2 parts industrial-grade titanium dioxide, and 4-8 parts N-hydroxyethylpiperazine.

[0054] The preparation method of the modified resin carbon dioxide scavenger in this embodiment includes the following steps:

[0055] S1. Dissolve urea-formaldehyde resin in water at 4 times its weight, then immediately add cysteine ​​to the urea-formaldehyde resin aqueous solution and allow it to react fully to obtain a mixed solution.

[0056] S2. Add chitosan to the mixed solution in step S1 and dissolve it completely to obtain a modified solution;

[0057] S3. Immediately add titanium dioxide to the modified solution in step S2 and stir thoroughly to obtain a mixed suspension.

[0058] S4. Add gelatin to the mixed suspension in step S3, then adjust the pH of the system to 8-9 using N-hydroxyethylpiperazine, and stir thoroughly to obtain the modified resin.

[0059] S5. The modified resin is heated at 70°C for 2 hours and then cooled to room temperature to obtain the modified resin carbon dioxide scavenger.

[0060] Example 3

[0061] In this embodiment, the modified resin carbon dioxide scavenger comprises the following raw materials in parts by weight:

[0062] 4 parts urea-formaldehyde resin, 0.5 parts cysteine, 2 parts acid-soluble chitosan, 8 parts food-grade gelatin, 0.5 parts industrial-grade titanium dioxide, and 4-8 parts N-hydroxyethylpiperazine.

[0063] The preparation method of the modified resin carbon dioxide scavenger in this embodiment includes the following steps:

[0064] S1. Dissolve urea-formaldehyde resin in water at a ratio of 3 times the weight of urea-formaldehyde resin, then immediately add cysteine ​​to the aqueous solution of urea-formaldehyde resin and allow it to react fully to obtain a mixed solution.

[0065] S2. Add chitosan to the mixed solution in step S1 and dissolve it completely to obtain a modified solution;

[0066] S3. Immediately add titanium dioxide to the modified solution in step S2 and stir thoroughly to obtain a mixed suspension.

[0067] S4. Add gelatin to the mixed suspension in step S3, then adjust the pH of the system to 8-9 using N-hydroxyethylpiperazine, and stir thoroughly to obtain the modified resin.

[0068] S5. The modified resin is heated at 60°C for 3 hours and then cooled to room temperature to obtain the modified resin carbon dioxide scavenger.

[0069] Example 4

[0070] In this embodiment, the modified resin carbon dioxide scavenger comprises the following raw materials in parts by weight:

[0071] The ingredients are: 6 parts urea-formaldehyde resin, 2 parts cysteine, 4 parts acid-soluble chitosan, 12 parts food-grade gelatin, 2 parts industrial-grade titanium dioxide, and 4-8 parts N-hydroxyethylpiperazine.

[0072] The preparation method of the modified resin carbon dioxide scavenger in this embodiment includes the following steps:

[0073] S1. Dissolve urea-formaldehyde resin in water at a ratio of 3 times the weight of urea-formaldehyde resin, then immediately add cysteine ​​to the aqueous solution of urea-formaldehyde resin and allow it to react fully to obtain a mixed solution.

[0074] S2. Add chitosan to the mixed solution in step S1 and dissolve it completely to obtain a modified solution;

[0075] S3. Immediately add titanium dioxide to the modified solution in step S2 and stir thoroughly to obtain a mixed suspension.

[0076] S4. Add gelatin to the mixed suspension in step S3, then adjust the pH of the system to 8-9 using N-hydroxyethylpiperazine, and stir thoroughly to obtain the modified resin.

[0077] S5. The modified resin is heated at 60°C for 3 hours and then cooled to room temperature to obtain the modified resin carbon dioxide scavenger.

[0078] Example 5

[0079] In this embodiment, the modified resin carbon dioxide scavenger comprises the following raw materials in parts by weight:

[0080] 5 parts urea-formaldehyde resin, 1 part cysteine, 3 parts acid-soluble chitosan, 10 parts food-grade gelatin, 1 part industrial-grade titanium dioxide, and 4-8 parts N-hydroxyethylpiperazine.

[0081] The preparation method of the modified resin carbon dioxide scavenger in this embodiment includes the following steps:

[0082] S1. Dissolve urea-formaldehyde resin in water at a ratio of 3 times the weight of urea-formaldehyde resin, then immediately add cysteine ​​to the aqueous solution of urea-formaldehyde resin and allow it to react fully to obtain a mixed solution.

[0083] S2. Add chitosan to the mixed solution in step S1 and dissolve it completely to obtain a modified solution;

[0084] S3. Immediately add titanium dioxide to the modified solution in step S2 and stir thoroughly to obtain a mixed suspension.

[0085] S4. Add gelatin to the mixed suspension in step S3, then adjust the pH of the system to 8-9 using N-hydroxyethylpiperazine, and stir thoroughly to obtain the modified resin.

[0086] S5. The modified resin is heated at 60°C for 3 hours and then cooled to room temperature to obtain the modified resin carbon dioxide scavenger.

[0087] Example 6

[0088] In this embodiment, the modified resin carbon dioxide scavenger comprises the following raw materials in parts by weight:

[0089] 5 parts urea-formaldehyde resin, 1.5 parts cysteine, 3 parts acid-soluble chitosan, 10 parts food-grade gelatin, 1.5 parts industrial-grade titanium dioxide, and 4-8 parts N-hydroxyethylpiperazine.

[0090] The preparation method of the modified resin carbon dioxide scavenger in this embodiment includes the following steps:

[0091] S1. Dissolve urea-formaldehyde resin in water at a ratio of 3 times the weight of urea-formaldehyde resin, then immediately add cysteine ​​to the aqueous solution of urea-formaldehyde resin and allow it to react fully to obtain a mixed solution.

[0092] S2. Add chitosan to the mixed solution in step S1 and dissolve it completely to obtain a modified solution;

[0093] S3. Immediately add titanium dioxide to the modified solution in step S2 and stir thoroughly to obtain a mixed suspension.

[0094] S4. Add gelatin to the mixed suspension in step S3, then adjust the pH of the system to 8-9 using N-hydroxyethylpiperazine, and stir thoroughly to obtain the modified resin.

[0095] S5. The modified resin is heated at 55°C for 4 hours and then cooled to room temperature to obtain the modified resin carbon dioxide scavenger.

[0096] Compare with Example 1

[0097] This comparative example is basically the same as Example 5, except that polypropylene resin is used instead of urea-formaldehyde resin in Example 1.

[0098] Compare with Example 2

[0099] This comparative example is basically the same as Example 5, except that acrylic resin is used instead of urea-formaldehyde resin in Example 1.

[0100] Compare with Example 3

[0101] This comparative example is basically the same as Example 5, except that glycine is used instead of cysteine ​​in Example 1.

[0102] Compare with Example 4

[0103] This comparative example is basically the same as Example 5, except that glutamic acid is used instead of cysteine ​​in Example 1.

[0104] Compare with Example 5

[0105] This comparative example is basically the same as Example 5, except that food-grade pectin is used instead of food-grade gelatin in Example 1.

[0106] Experimental Example 1

[0107] The modified resin carbon dioxide scavengers prepared in Example 5 and Comparative Examples 1-5 were tested for carbon dioxide adsorption performance. The test methods are as follows:

[0108] Set up 30m 3 A sealed laboratory equipped with a carbon dioxide sensor and a 300m³ / h filtration system. 3A fan with a capacity of / h places the modified resin carbon dioxide scavenger in a sealed laboratory.

[0109] Start the fan and set it to 300m 3 The fan operates at a flow rate of / h. Parameters such as current and voltage are observed and recorded during operation, as well as changes in carbon dioxide concentration in the laboratory. The reading of the carbon dioxide sensor is recorded every minute.

[0110] The test results are shown in Table 1-2.

[0111] Table 1. Adsorption effect of different traps on carbon dioxide in Example 5 and Comparative Examples 1-5

[0112]

[0113]

[0114] Table 2 shows the adsorption effect of different traps on carbon dioxide after 100 cycles in Example 5 and Comparative Examples 1-5.

[0115]

[0116] As shown in Tables 1-2, the carbon dioxide trap prepared in Example 5 of the present invention has a higher adsorption rate for carbon dioxide and good cycle stability compared with the control examples 1-5.

[0117] Experimental Example 2

[0118] The present invention further regenerated the failed trapping agent in Experiment Example 1 and tested the adsorption performance of the regenerated trapping agent. The test results are shown in Table 3.

[0119] The regeneration method is as follows: the exhausted trapping agent is treated at 80°C for 10 minutes to obtain the regenerated trapping agent.

[0120] Table 3. Adsorption effect of different failed traps on carbon dioxide after regeneration in Example 5 and Comparative Examples 1-5.

[0121]

[0122] As shown in Table 3, the trapping agent prepared in Example 5 of the present invention can still maintain a high adsorption efficiency after failure and regeneration compared with the control examples 1-5, effectively extending the service life of the trapping agent.

[0123] Experimental Example 3

[0124] The present invention also tested the anti-interference performance of the modified resin carbon dioxide traps prepared in Example 5 and Comparative Examples 1-5, and the test methods are as follows:

[0125] Set up 30m 3 A sealed laboratory equipped with carbon dioxide sensors, nitrogen dioxide sensors, and a 300m³ / h filtration system. 3 A fan with a capacity of / h was used to place the modified resin carbon dioxide scavenger in a sealed laboratory and introduce 400PPM of NO2.

[0126] Start the fan and set it to 300m 3 The fan was operated at a flow rate of / h. Parameters such as current and voltage during operation were observed and recorded, as well as changes in carbon dioxide concentration in the laboratory. The reading of the carbon dioxide sensor was recorded every minute. The test results are shown in Table 4.

[0127] Table 4 Anti-interference performance data

[0128]

[0129] As shown in Table 4, the trapping agent prepared in Example 5 of the present invention can still maintain good trapping performance in a nitrogen dioxide environment compared with the control examples 1-5, and has excellent anti-interference performance.

[0130] In summary, the modified resin carbon dioxide scavenger prepared by this invention not only possesses excellent carbon dioxide adsorption performance, but also exhibits high stability and anti-interference performance.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A modified resin carbon dioxide scavenger, characterized in that, The ingredients include the following parts by weight: 2-10 parts urea-formaldehyde resin, 0.5-2 parts cysteine, 1-5 parts chitosan, 5-15 parts gelatin, 0.5-2 parts titanium dioxide, and 4-8 parts N-hydroxyethylpiperazine; The preparation method of the modified resin carbon dioxide scavenger includes the following steps: S1. Immediately add cysteine ​​to the aqueous solution of urea-formaldehyde resin, allow it to react fully, and obtain a mixed solution; S2. Add chitosan to the mixed solution in step S1 and dissolve it completely to obtain a modified solution; S3. Immediately add titanium dioxide to the modified solution in step S2 and stir thoroughly to obtain a mixed suspension. S4. Add gelatin and N-hydroxyethylpiperazine sequentially to the mixed suspension in step S3, and stir thoroughly to obtain the modified resin; S5. The modified resin is heated and molded to obtain a modified resin carbon dioxide scavenger.

2. The modified resin carbon dioxide scavenger according to claim 1, characterized in that, The chitosan is acid-soluble chitosan.

3. The modified resin carbon dioxide scavenger according to claim 1, characterized in that, The gelatin is food-grade gelatin.

4. The modified resin carbon dioxide scavenger according to claim 1, characterized in that, The titanium dioxide has a particle size of 0.2-0.4 μm.

5. The modified resin carbon dioxide scavenger according to claim 1, characterized in that, The ingredients include the following parts by weight: The ingredients are: 4-6 parts urea-formaldehyde resin, 0.5-2 parts cysteine, 2-4 parts chitosan, 8-12 parts gelatin, 0.5-2 parts titanium dioxide, and 4-8 parts N-hydroxyethylpiperazine.

6. A method for preparing the modified resin carbon dioxide scavenger according to any one of claims 1-5, characterized in that, Includes the following steps: S1. Immediately add cysteine ​​to the aqueous solution of urea-formaldehyde resin, allow it to react fully, and obtain a mixed solution; S2. Add chitosan to the mixed solution in step S1 and dissolve it completely to obtain a modified solution; S3. Immediately add titanium dioxide to the modified solution in step S2 and stir thoroughly to obtain a mixed suspension. S4. Add gelatin and N-hydroxyethylpiperazine sequentially to the mixed suspension in step S3, and stir thoroughly to obtain the modified resin; S5. The modified resin is heated and molded to obtain a modified resin carbon dioxide scavenger.

7. The preparation method according to claim 6, characterized in that, In step S1, the mass ratio of urea-formaldehyde resin to water in the aqueous solution of urea-formaldehyde resin is 1:(2-4).

8. The preparation method according to claim 6, characterized in that, In step S4, N-hydroxyethylpiperazine is added to adjust the pH of the system to 8-9.

9. The preparation method according to claim 6, characterized in that, In step S5, during the heating and molding process, the temperature is controlled at 50-70℃ and the time is 2-4 hours.

10. A method for regenerating the modified resin carbon dioxide scavenger according to any one of claims 1-5, characterized in that, The degraded modified resin carbon dioxide scavenger was treated at 70-90℃ for 5-15 minutes to obtain the regenerated modified resin carbon dioxide scavenger.

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