A high-efficiency composite CO2 capture agent and its preparation method and application

Abstract

The present application relates to the field of waste gas recovery and utilization, and in particular to a high-efficiency composite CO2 capture agent, a preparation method thereof, and an application thereof; the method comprises: dissolving an activator and a main absorbent separately, mixing them, and then subjecting the mixture to microwave treatment at a preset temperature and for a preset time to obtain a composite absorbent; adding a stabilizer, a corrosion inhibitor, and an antioxidant to the composite absorbent in sequence under vacuum conditions to obtain a high-efficiency composite CO2 capture agent; the mass ratio of the activator to the main absorbent is 1:1 to 1:5; subjecting the activator and the main absorbent to a microwave reaction, utilizing the high energy of the microwave to cause the active ingredients in the activator and the main absorbent to generate polyamine-based protonated products and activated amino products, thereby reducing the viscosity of the high-efficiency composite CO2 capture agent, controlling the ratio of the activator to the main absorbent, improving the CO2 capture efficiency, and increasing the CO2 capture amount, thereby obtaining a low-viscosity high-efficiency composite CO2 capture agent under simple process conditions, and applying the same on a large scale in industry.

Description

Technical Field

[0001] The present application relates to the field of waste gas recovery and utilization, and in particular to a high-efficiency composite CO2 capture agent and its preparation method and application. Background Art

[0002] The main CO2 capture technologies include pre-combustion capture, post-combustion capture, oxygen-enriched combustion technology, and chemical chain combustion technology. Post-combustion capture technology refers to a technology that separates CO2 from other components in the flue gas produced after combustion to achieve CO2 enrichment. At present, the technology that has been more deeply studied in post-combustion capture technology is mainly chemical absorption. The chemical absorption technology of CO2 usually includes three main process steps: low-temperature purification of flue gas, high-temperature desorption and regeneration of absorbent, and further storage and utilization of the desorbed CO2. However, the CO2 partial pressure in post-combustion flue gas is usually less than 0.15 atmospheres. Therefore, a chemical absorbent with strong binding force with CO2 is needed to separate and capture CO2. How to select an absorbent that performs well in terms of absorption rate, regeneration energy consumption, absorbent loss, etc. has become the most critical part of the current research on chemical absorption method.

[0003] Currently, chemical absorption methods primarily utilize ethanolamine to dissociate in an aqueous solution, converting the solution to an alkaline state. This process then chemically reacts with the acidic CO2 gas to capture and absorb CO2. Traditional ethanolamine single-agent scavengers are suitable for treating low CO2 concentrations in flue gas. They offer excellent carbon capture and separation performance, achieving a carbon capture rate of up to 99.99% under optimal process conditions. Their simple operation system has made them the most widely used and adaptable flue gas decarbonization technology for coal-fired power plants internationally. However, these scavengers suffer from low capture capacity, short high-efficiency capture times, high solution regeneration energy consumption, and the tendency to degrade, generating toxic byproducts. They are also prone to equipment corrosion at high temperatures.

[0004] Because a single absorbent struggles to simultaneously meet the requirements of high absorption rate, high absorption capacity, and low solution viscosity, many researchers have focused on composite capture agents. However, current preparation methods for composite capture agents are either difficult to commercialize due to high product viscosity, or hinder scalable application due to complex processes, low reaction efficiency, high energy consumption, and high raw material costs. Therefore, developing a method for preparing highly efficient composite CO2 capture agents with low viscosity and a simple process is a pressing technical challenge. Summary of the Invention

[0005] The present application provides a high-efficiency composite CO2 capture agent and its preparation method and application, in order to solve the technical problems in the prior art that the preparation method of the composite CO2 capture agent is difficult to achieve industrial application due to the high viscosity of the product, or difficult to be applied on a large scale due to complex process, low reaction efficiency, high energy consumption and high raw material cost.

[0006] In a first aspect, the present application provides a method for preparing a high-efficiency composite CO2 capture agent, the method comprising:

[0007] The activator and the main absorbent are dissolved separately, mixed, and then subjected to microwave treatment at a preset temperature and a preset time to obtain a composite absorbent containing a multi-amino protonation reaction product and an amino activation product;

[0008] Adding a stabilizer, a corrosion inhibitor and an antioxidant to the composite absorbent in sequence under vacuum conditions to obtain a high-efficiency composite CO2 capture agent;

[0009] Wherein, the mass ratio of the activator to the main absorbent is 1:1 to 1:5.

[0010] Optionally, the preset temperature is 30° C. to 80° C.; and / or,

[0011] The preset time is 5 minutes to 30 minutes.

[0012] Optionally, the frequency of the microwave treatment is 2 GHz to 20 GHz, and the power of the microwave treatment is 500 W to 1500 kW.

[0013] Optionally, the activator includes at least one of sodium carbonate, imidazole ionic liquid and tetrafluoroborate ionic liquid.

[0014] Optionally, the main absorbent includes an organic amine main absorbent and / or an amino acid salt main absorbent.

[0015] Optionally, the stabilizer includes red mud and / or carbide slag; and / or,

[0016] The corrosion inhibitor comprises at least one of imidazoline, imidazoline derivatives, quaternary ammonium salts, cetyltrimethylammonium bromide, polyvinylamine, polyaspartic acid, fiber derivatives, potassium iodide and thiourea;

[0017] The antioxidant includes at least one of hydroquinone, pyrocatechol, resorcinol and pyrogallol.

[0018] In a second aspect, the present application provides a high-efficiency composite CO2 capture agent, which is prepared by the method described in the first aspect. The raw materials of the high-efficiency composite CO2 capture agent include, in parts by weight:

[0019] Main absorbent: 10-50 parts, activator: 5-25 parts, stabilizer: 1-10 parts, corrosion inhibitor: 0.5-5 parts, antioxidant: 0-5 parts, water: 50-250 parts.

[0020] In a third aspect, the present application provides an application of a high-efficiency composite CO2 capture agent, which includes using the high-efficiency composite CO2 capture agent obtained by the method described in the first aspect or the high-efficiency composite CO2 capture agent described in the second aspect for capturing CO2.

[0021] Optionally, the application includes the steps of:

[0022] The high-efficiency composite CO2 capture agent is used to absorb CO2 in the flue gas and perform a capture reaction to obtain a capture agent-rich liquid;

[0023] Separating the solid phase stabilizer from the collector rich solution, then adding a desorption aid, and performing a desorption reaction to obtain a regenerated lean solution;

[0024] Cooling the regenerated lean liquid and then performing solid-liquid separation to obtain a regenerated high-efficiency composite CO2 capture agent;

[0025] Wherein, the weight portion of the desorption aid is 1 to 5 parts;

[0026] The capture reaction is carried out in a manner of continuously or intermittently adding a stabilizer.

[0027] Optionally, the desorption reaction temperature is 90° C. to 115° C.; and / or,

[0028] The terminal temperature of the cooling is 20°C to 35°C.

[0029] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0030] The embodiment of the present application provides a method for preparing a high-efficiency composite CO2 capture agent. Compared with the existing technology, it only requires microwave reaction of the activator and the main absorbent. The high energy of the microwave is used to make the active ingredients in the activator and the main absorbent generate polyamine-based protonated products and activated amino products, and at the same time, the activator and the main absorbent are completely dispersed. The generated polyamine-based protonated products and activated amino products have good water solubility, so that the viscosity of the high-efficiency composite CO2 capture agent can be effectively reduced. At the same time, the ratio of the activator and the main absorbent is controlled, thereby controlling the microwave reaction to generate a large amount of polyamine-based protonated products and activated amino products. The generated polyamine-based protonated products and activated amino products can also increase the binding rate between the CO2 capture agent and CO2, thereby improving the CO2 capture efficiency and the CO2 capture amount. Therefore, a low-viscosity high-efficiency composite CO2 capture agent can be obtained under simple process conditions, which can be used on a large scale in industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] Figure 1 A schematic flow chart of a method for preparing a high-efficiency composite CO2 capture agent provided in an embodiment of the present application;

[0034] Figure 2 Schematic diagram of the application process of the high-efficiency composite CO2 capture agent provided in the embodiments of the present application. DETAILED DESCRIPTION

[0035] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0036] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0037] The creative thinking of this application is: the current direction of the preparation method of the composite capture agent is:

[0038] (1) Using composite scavengers to mix organic amines with different characteristics or organic amines with ionic liquids to obtain new absorbents with high absorption rate and absorption capacity while low regeneration energy consumption and loss has become one of the current research focuses. This method effectively avoids the shortcomings of the reaction between a single scavenger and CO2 by synergistically utilizing the advantages of different components in the process of capturing CO2, thereby improving the capture capacity and reducing the regeneration energy consumption, achieving the effect of "taking the best from the best and making up for the worst". However, the cyclic stability of the composite scavenger prepared by the mixing method still depends on the capture performance of each component of the mixed scavenger, and the viscosity of the composite amine scavenger is relatively high, especially the scavenger compounded with ionic liquid, which is not conducive to industrial application.

[0039] (2) After mixing the organic amine with the ionic liquid, heating them to react and form an alcoholamine-type ionic liquid, this avoids the problems of high viscosity and low capture capacity of the collector prepared by the traditional composite method. However, this process is complex, with low reaction efficiency, high energy consumption, and high raw material costs, which is not conducive to large-scale application.

[0040] Therefore, how to provide a method for preparing a high-efficiency composite CO2 capture agent with low viscosity and simple process is a technical problem that needs to be solved urgently.

[0041] like Figure 1 As shown, the embodiment of the present application provides a method for preparing a high-efficiency composite CO2 capture agent, the method comprising:

[0042] S1. The activator and the main absorbent are dissolved separately and mixed, and then microwave-treated at a preset temperature and a preset time to obtain a composite absorbent containing a multi-amino protonated reaction product and an amino-containing activated product;

[0043] S2. A stabilizer, a corrosion inhibitor and an antioxidant were sequentially added to the composite absorbent under vacuum conditions to obtain an efficient composite CO2 capture agent;

[0044] Wherein, the mass ratio of the activator to the main absorbent is 1:1 to 1:5.

[0045] In the embodiments of the present application, controlling the specific mass ratio of the activator and the main absorbent can effectively control the content of polyamine-based protonated products and activated amino products, thereby effectively improving the capture capacity and capture efficiency of the capture agent for CO2 and reducing the viscosity of the capture agent.

[0046] In some optional embodiments, the preset temperature is 30° C. to 80° C.; and / or,

[0047] The preset time is 5 minutes to 30 minutes.

[0048] In the embodiments of the present application, the specific time and temperature of the microwave reaction are controlled to ensure the microwave effect on the activator and the main absorber, thereby ensuring that a sufficient number of polyamine-based protonated products and activated amino products are generated in the activator and the main absorber, thereby improving the capture capacity and capture efficiency of the capture agent for CO2, and ensuring the effect of reducing the viscosity of the capture agent.

[0049] In some optional embodiments, the frequency of the microwave treatment is 2 GHz to 20 GHz, and the power of the microwave treatment is 500 W to 1500 W.

[0050] In the embodiments of the present application, controlling the specific frequency and power of the microwave treatment can further ensure the microwave effect on the activator and the main absorber, thereby ensuring that a sufficient number of polyamine-based protonated products and activated amino products are generated in the activator and the main absorber.

[0051] In some optional embodiments, the activator includes at least one of sodium carbonate, imidazole ionic liquid and tetrafluoroborate ionic liquid.

[0052] In the embodiments of the present application, controlling the specific activator can effectively ensure the activation effect of the activator on the main absorber, thereby ensuring that a sufficient number of polyamine-based protonated products and activated amino products can be obtained in the subsequent microwave reaction process, thereby improving the capture capacity and capture efficiency of the capture agent for CO2, and ensuring the effect of reducing the viscosity of the capture agent.

[0053] In some optional embodiments, the main absorbent includes an organic amine main absorbent and / or an amino acid salt main absorbent.

[0054] In the embodiments of the present application, controlling the specific main absorber can ensure that a sufficient number of polyamine-based protonated products and activated amino products can be obtained during the subsequent microwave reaction process, thereby improving the CO2 capture capacity and capture efficiency of the capture agent and ensuring the effect of reducing the viscosity of the capture agent.

[0055] In some optional embodiments, the stabilizer includes red mud and / or carbide slag; and / or,

[0056] The corrosion inhibitor comprises at least one of imidazoline, imidazoline derivatives, quaternary ammonium salts, cetyltrimethylammonium bromide, polyvinylamine, polyaspartic acid, fiber derivatives, potassium iodide and thiourea;

[0057] The antioxidant includes at least one of hydroquinone, pyrocatechol, resorcinol and pyrogallol.

[0058] In the embodiments of the present application, by controlling the specific types of stabilizers, corrosion inhibitors and antioxidants, the generated polyamine-based protonated products and activated amino products can be stabilized through the stabilizers, corrosion inhibitors and antioxidants, thereby improving the capture capacity and capture efficiency of the capture agent for CO2 and ensuring the effect of reducing the viscosity of the capture agent.

[0059] Based on a general inventive concept, the present application provides a high-efficiency composite CO2 capture agent, which is prepared by the method. The raw materials of the high-efficiency composite CO2 capture agent include, in parts by weight:

[0060] Main absorbent: 10-50 parts, activator: 5-25 parts, stabilizer: 1-10 parts, corrosion inhibitor: 0.5-5 parts, antioxidant: 0-5 parts, water: 50-250 parts.

[0061] In the embodiments of the present application, controlling the specific composition of the high-efficiency composite CO2 capture agent can effectively ensure the normal capture function of the CO2 capture agent, while improving the desorption performance of the capture agent, reducing the corrosion performance of the reaction system, improving the antioxidant properties of the capture agent, and extending the life of the capture agent.

[0062] The high-efficiency composite CO2 capture agent is prepared by the above-mentioned method. The specific steps of the method can be referred to the above-mentioned embodiments. Since the high-efficiency composite CO2 capture agent adopts part or all of the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0063] Based on a general inventive concept, the present application provides an application of a high-efficiency composite CO2 capture agent, which includes using the high-efficiency composite CO2 capture agent obtained by the method or the high-efficiency composite CO2 capture agent for capturing CO2.

[0064] This application is realized based on the high-efficiency composite CO2 capture agent prepared by the above method. The specific steps of the method can refer to the above embodiments. Since this application adopts part or all of the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0065] like Figure 2 As shown, in some optional embodiments, the application includes the steps of:

[0066] S1. Using the efficient composite CO2 capture agent to absorb CO2 in the flue gas, and performing a capture reaction to obtain a capture agent-rich liquid;

[0067] S2 separation of the solid phase stabilizer in the rich solution of the capture agent, after adding a desorption aid, and the desorption reaction is carried out to obtain a regenerated lean solution;

[0068] S3 cooling the regenerated lean liquid, after solid-liquid separation, to obtain a regenerated efficient composite CO2 capture agent;

[0069] Wherein, the weight portion of the desorption aid is 1 to 5 parts;

[0070] The capture reaction is carried out in a manner of continuously or intermittently adding a stabilizer.

[0071] In the embodiment of the present application, through the practical application of a high-efficiency composite CO2 capture agent, the solid phase stabilizer in the capture agent rich liquid is separated out, and then a desorption aid is added. The CO2 in the capture agent rich liquid can be completely desorbed by the desorption aid, and then the regenerated lean liquid is cooled and the solid-liquid separation is performed, thereby realizing the recycling of the high-efficiency composite CO2 capture agent and the desorption aid.

[0072] In the subsequent capture process, the recovered high-efficiency composite CO2 capture agent can be continuously or intermittently added with a stabilizer, and then stirred evenly before being transported to a CO2 capture reactor to circulate and capture CO2. By continuously adding stabilizers, the reaction activity of the activated amino product with CO2 under alkaline conditions is enhanced, thereby maintaining the stability of the reaction performance of the composite capture agent.

[0073] The desorption aid includes at least one of trimellitic anhydride, adipic acid, suberic acid, phthalic acid, sebacic acid, boric acid, tungstic acid and molybdic acid.

[0074] In some optional embodiments, the temperature of the desorption reaction is 90° C. to 115° C.; and / or,

[0075] The terminal temperature of the cooling is 20°C to 35°C.

[0076] In the embodiment of the present application, controlling the temperature of the desorption reaction can effectively ensure that the CO2 in the capture agent rich solution is completely desorbed, thereby obtaining a regenerated lean solution rich in CO2 capture agent, which is convenient for the subsequent regeneration of the efficient composite CO2 capture agent.

[0077] Controlling the specific endpoint temperature of cooling can ensure that the solubility of the high-efficiency composite CO2 capture agent in the regenerated lean liquid decreases with the change of temperature, thereby realizing the precipitation of the high-efficiency composite CO2 capture agent in the form of crystals, facilitating the separation of the high-efficiency composite CO2 capture agent and the desorption aid, thereby realizing the recycling of the high-efficiency composite CO2 capture agent and the desorption aid.

[0078] The present application will be further described below in conjunction with specific examples. It should be understood that these examples are intended to illustrate the present application only and are not intended to limit the scope of the present application. The experimental methods in the following examples where specific conditions are not specified are usually measured in accordance with national standards. If there are no corresponding national standards, then the methods are carried out in accordance with general international standards, conventional conditions, or according to the conditions recommended by the manufacturer.

[0079] Example 1

[0080] The raw materials of the high-efficiency composite CO2 capture agent include: main absorbent, activator, stabilizer, corrosion inhibitor, and antioxidant, which are ethanolamine, imidazole ionic liquid, red mud, quaternary ammonium salt, hydroquinone and water respectively. Among them, the mass ratio of ethanolamine, imidazole ionic liquid, red mud, quaternary ammonium salt, hydroquinone and water is 10:5:1:0.5:0.5:50.

[0081] The method for preparing the above-mentioned high-efficiency composite CO2 capture agent comprises the following steps:

[0082] S1. The activator and the main absorbent are dissolved separately and mixed, and then microwave-treated at a preset temperature and a preset time to obtain a composite absorbent containing a multi-amino protonated reaction product and an amino-containing activated product;

[0083] S2. Add stabilizer, corrosion inhibitor and antioxidant to the composite absorbent in sequence under vacuum environment to obtain a high-efficiency composite CO2 capture agent.

[0084] The preset temperature is 30℃; the preset time is 5 minutes.

[0085] The frequency of the microwave treatment is 2 GHz, and the power of the microwave treatment is 500 kW.

[0086] The high-efficiency composite CO2 capture is used for CO2 removal reaction, and the specific steps are as follows:

[0087] S1. Using a high-efficiency composite CO2 capture agent to absorb CO2 in the flue gas and react to obtain a capture agent-rich liquid;

[0088] S2. Separating the solid phase stabilizer from the collector-rich solution, adding a desorption aid, and performing a desorption reaction to obtain a regenerated lean solution;

[0089] S3. Cooling the regenerated lean liquid and then performing solid-liquid separation to obtain a regenerated efficient composite CO2 capture agent;

[0090] The desorption reaction temperature was 90°C; the cooling endpoint temperature was 20°C.

[0091] The analytical aid is a mixture of adipic acid and phthalic acid.

[0092] Example 2

[0093] Comparing Example 2 with Example 1, the difference between Example 2 and Example 1 is:

[0094] The raw materials of the high-efficiency composite CO2 capture agent include: main absorbent, activator, stabilizer, corrosion inhibitor, and antioxidant, which are ethanolamine, imidazole ionic liquid, red mud, quaternary ammonium salt, hydroquinone and water respectively. Among them, the mass ratio of ethanolamine, imidazole ionic liquid, red mud, quaternary ammonium salt, hydroquinone and water is 10:5:1:0.5:0.5:50.

[0095] The preset temperature is 60℃; the preset time is 10 minutes.

[0096] The frequency of the microwave treatment is 5 GHz, and the power of the microwave treatment is 00 kW.

[0097] The desorption reaction temperature was 90°C; the cooling endpoint temperature was 25°C.

[0098] The analytical aid is a mixture of boric acid, tungstic acid and sebacic acid.

[0099] Example 3

[0100] Comparing Example 3 with Example 1, the difference between Example 3 and Example 1 is:

[0101] The raw materials of the high-efficiency composite CO2 capture agent include: the main absorbent, activator, stabilizer, corrosion inhibitor, and antioxidant are diethylenetriamine, tetrafluoroborate ionic liquid, a mixture of carbide slag and red mud (mixed in a ratio of 1:1 by mass), imidazoline and its derivatives, resorcinol and water, among which the mass ratio of diethylenetriamine, tetrafluoroborate ionic liquid, a mixture of carbide slag and red mud (mixed in a ratio of 1:1 by mass), imidazoline and its derivatives, resorcinol and water is 10:5:1:0.5:0.5:50.

[0102] The preset temperature is 70℃; the preset time is 30 minutes.

[0103] The frequency of the microwave treatment is 15 GHz, and the power of the microwave treatment is 1000 kW.

[0104] The desorption reaction temperature was 90°C; the cooling endpoint temperature was 30°C.

[0105] The analytical aid is a mixture of molybdic acid and sebacic acid.

[0106] Example 4

[0107] Comparing Example 4 with Example 1, the difference between Example 4 and Example 1 is:

[0108] The raw materials of the high-efficiency composite CO2 capture agent include: the main absorbent, activator, stabilizer, corrosion inhibitor, and antioxidant are lysine, imidazole ionic liquid, carbide slag and red mud mixture (according to the mass ratio of 1:2), imidazoline and its derivatives, resorcinol and water, among which the mass ratio of lysine, imidazole ionic liquid, carbide slag and red mud mixture (according to the mass ratio of 1:2), imidazoline and its derivatives, resorcinol and water is 30:20:10:1:1:100.

[0109] The preset temperature is 70℃; the preset time is 30 minutes.

[0110] The frequency of the microwave treatment is 15 GHz, and the power of the microwave treatment is 1000 kW.

[0111] The desorption reaction temperature was 100°C; the cooling endpoint temperature was 30°C.

[0112] Adipic acid was used as the analytical aid.

[0113] Example 5

[0114] Comparing Example 5 with Example 1, the difference between Example 5 and Example 1 is:

[0115] The raw materials of the high-efficiency composite CO2 capture agent include: the main absorbent, activator, stabilizer, corrosion inhibitor, and antioxidant are respectively a mixture of triethylenediamine and lysine (according to the mass ratio of 1:1), imidazole ionic liquid, a mixture of carbide slag and red mud, polyethylene amine and aspartic acid (according to the mass ratio of 1:1), and pyroquinone and water. Among them, the mass ratio of triethylenediamine and lysine mixture (according to the mass ratio of 1:1), imidazole ionic liquid, a mixture of carbide slag and red mud, polyethylene amine and aspartic acid (according to the mass ratio of 1:1), and pyroquinone to water is 50:25:10:5:5:250.

[0116] The preset temperature is 80℃; the preset time is 10 minutes.

[0117] The frequency of the microwave treatment is 20 GHz, and the power of the microwave treatment is 1500 W.

[0118] The desorption reaction temperature was 100°C; the cooling endpoint temperature was 20°C.

[0119] Tungstic acid is used as an analytical aid.

[0120] Example 6

[0121] Comparing Example 6 with Example 1, the difference between Example 6 and Example 1 is:

[0122] The raw materials of the high-efficiency composite CO2 capture agent include: the main absorbent, activator, stabilizer, corrosion inhibitor, and antioxidant are diethylenetriamine, imidazole ionic liquid, carbide slag, polyethylene amine and aspartic acid (according to the mass ratio of 1:1), catechol and water, among which the mass ratio of diethylenetriamine, imidazole ionic liquid, carbide slag, polyethylene amine and aspartic acid (according to the mass ratio of 1:1), catechol and water is 50:25:10:5:5:200.

[0123] The preset temperature is 70℃; the preset time is 30 minutes.

[0124] The frequency of the microwave treatment is 15 GHz, and the power of the microwave treatment is 1000 W.

[0125] The desorption reaction temperature was 90°C; the cooling endpoint temperature was 30°C.

[0126] Adipic acid was used as the analytical aid.

[0127] Example 7

[0128] Comparing Example 7 with Example 1, the difference between Example 7 and Example 1 is:

[0129] The raw materials of the high-efficiency composite CO2 capture agent include: the main absorbent, activator, stabilizer, corrosion inhibitor, and antioxidant are respectively a mixture of triethylenediamine and lysine (according to the mass ratio of 1:1), imidazole ionic liquid, a mixture of carbide slag and red mud, polyethylene amine and aspartic acid (according to the mass ratio of 1:1), and pyroquinone and water. Among them, the mass ratio of triethylenediamine and lysine mixture (according to the mass ratio of 1:1), imidazole ionic liquid, a mixture of carbide slag and red mud, polyethylene amine and aspartic acid (according to the mass ratio of 1:1), and pyroquinone to water is 50:25:10:5:5:250.

[0130] The preset temperature is 80℃; the preset time is 10 minutes.

[0131] The frequency of the microwave treatment is 10 GHz, and the power of the microwave treatment is 1000 kW.

[0132] The desorption reaction temperature was 90°C; the cooling endpoint temperature was 20°C.

[0133] Sebacic acid was used as the analytical aid.

[0134] Example 8

[0135] Comparing Example 8 with Example 1, the difference between Example 8 and Example 1 is:

[0136] The raw materials of the high-efficiency composite CO2 capture agent include: the main absorbent, activator, stabilizer, corrosion inhibitor, and antioxidant are respectively a mixture of triethylenediamine and lysine (according to the mass ratio of 1:1), imidazole ionic liquid, a mixture of carbide slag and red mud, polyethylene amine and aspartic acid (according to the mass ratio of 1:1), and pyroquinone and water. Among them, the mass ratio of triethylenediamine and lysine mixture (according to the mass ratio of 1:1), imidazole ionic liquid, a mixture of carbide slag and red mud, polyethylene amine and aspartic acid (according to the mass ratio of 1:1), and pyroquinone to water is 50:0:0:5:5:250.

[0137] The preset temperature is 80℃; the preset time is 30 minutes.

[0138] The frequency of the microwave treatment is 20 GHz, and the power of the microwave treatment is 1500 W.

[0139] The desorption reaction temperature was 115°C; the cooling endpoint temperature was 35°C.

[0140] Sebacic acid was used as the analytical aid.

[0141] Comparative Example 1

[0142] Comparing Comparative Example 1 with Example 1, the difference between Comparative Example 1 and Example 1 is:

[0143] The microwave reaction step was omitted, and the remaining steps and recipes were the same.

[0144] Comparative Example 2

[0145] Comparing Comparative Example 2 with Example 1, the difference between Comparative Example 2 and Example 1 is:

[0146] The preset temperature is 20℃; the preset time is 2 minutes.

[0147] Comparative Example 3

[0148] Comparing Comparative Example 3 with Example 1, the difference between Comparative Example 3 and Example 1 is:

[0149] The preset temperature is 90℃; the preset time is 45 minutes.

[0150] Comparative Example 4

[0151] Comparing Comparative Example 4 with Example 1, the difference between Comparative Example 4 and Example 1 is:

[0152] The frequency of the microwave treatment was 1.5 GHz, and the power of the microwave treatment was 400 W.

[0153] Comparative Example 5

[0154] Comparing Comparative Example 5 with Example 1, the difference between Comparative Example 5 and Example 1 is:

[0155] The frequency of the microwave treatment was 21 GHz, and the power of the microwave treatment was 1600 W.

[0156] Related experiments and effect data:

[0157] The high-efficiency composite CO2 capture agent obtained in the embodiment and comparative example was used for CO2 removal reaction. After three experiments, the highest capture efficiency and the effective capture time were calculated. At the same time, the desorption efficiency and the viscosity of the capture agent rich liquid were calculated. The results are shown in Table 1.

[0158] Table 1 Table of capture process parameters of high-efficiency composite CO2 capture agents obtained in various examples and comparative examples

[0159]

[0160]

[0161] As can be seen from the data in Table 1, the present application provides a method for preparing a high-efficiency composite CO2 scavenger, which utilizes the high energy of microwaves to enable the active ingredients in the activator and the main absorbent to generate polyamine-based protonated products and activated amino products, while completely dispersing the activator and the main absorbent. The generated polyamine-based protonated products and activated amino products have good water solubility, so that the viscosity of the high-efficiency composite CO2 scavenger can be effectively reduced. At the same time, the ratio of the activator and the main absorbent is controlled, thereby controlling the microwave reaction to generate a large amount of polyamine-based protonated products and activated amino products. The generated polyamine-based protonated products and activated amino products can also increase the binding rate between the CO2 scavenger and CO2, thereby improving the CO2 capture efficiency while increasing the CO2 capture amount. Therefore, a low-viscosity, high-efficiency composite CO2 scavenger can be obtained under simple process conditions, which can be used on a large scale in industry.

[0162] One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0163] (1) The embodiment of the present application provides a method for preparing a high-efficiency composite CO2 capture agent, by using a main absorbent and an activator in the capture agent under the action of microwaves to generate polyamine-based protonated products and activated amino products. By adjusting the ratio of the main absorbent and the activator, the content of the polyamine-based protonated products and the activated amino products is controlled, thereby effectively improving the CO2 capture capacity and capture efficiency of the capture agent and reducing the viscosity of the capture agent. At the same time, by adding a desorption aid, a corrosion inhibitor, an antioxidant, and preparing an aqueous solution, the desorption performance of the capture agent is improved, the corrosion performance of the reaction system is reduced, the antioxidant property of the capture agent is improved, and the life of the capture agent is extended.

[0164] (2) The embodiment of the present application provides an application for preparing a high-efficiency composite CO2 capture agent, by continuously adding a stabilizer thereto, thereby enhancing the reaction activity of the activated amino product therein with CO2 under alkaline conditions, thereby maintaining the stability of the reaction performance of the composite capture agent; at the same time, the corrosion inhibitor in the high-efficiency composite CO2 capture agent of the present application can not only introduce hydrophobic chains, polar groups and non-polar groups to slow down the corrosion of metal containers, but also the metal ions in the corrosion inhibitor can combine with the carboxyl group of the amino acid, thereby reducing its volatility.

[0165] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity and should not be understood as a hard limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numbers within the range. For example, the description of a range from 1 to 6 should be considered to have specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which applies regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0166] In this application, unless otherwise specified, the directional words used, such as "upper" and "lower", refer specifically to the directions of the drawings in the accompanying drawings. In addition, in the description of the present application specification, the terms "including", "comprising", etc. mean "including but not limited to". In this article, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. In this article, "and / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. Wherein A and B can be singular or plural. In this article, "at least one" refers to one or more, and "plurality" refers to two or more. "At least one", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, "at least one of a, b, or c", or "at least one of a, b and c", can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, c can be single or multiple.

[0167] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A method for preparing a high-efficiency composite CO2 capture agent, characterized in that: The method comprises: The activator and the main absorbent are dissolved separately and mixed, and then subjected to microwave treatment at a preset temperature and a preset time to obtain a composite absorbent containing a multi-amino protonation reaction product and an amino activation product; wherein the preset temperature is 30° C. to 80° C., the preset time is 5 min to 30 min, the frequency of the microwave treatment is 2 GHz to 20 GHz, and the power of the microwave treatment is 500 W to 1500 W; Adding a stabilizer, a corrosion inhibitor and an antioxidant to the composite absorbent in sequence under vacuum conditions to obtain a high-efficiency composite CO2 capture agent; Wherein, the mass ratio of the activator to the main absorbent is 1:1 to 1:5; The activator includes at least one of an imidazole ionic liquid and a tetrafluoroborate ionic liquid; The main absorbent includes an organic amine main absorbent and / or an amino acid salt main absorbent; The stabilizer includes red mud and / or carbide slag; The corrosion inhibitor comprises at least one of imidazoline, imidazoline derivatives, cetyltrimethylammonium bromide, polyvinylamine, polyaspartic acid, fiber derivatives, potassium iodide and thiourea; The antioxidant includes at least one of hydroquinone, catechol, resorcinol and pyrogallol.

2. A high-efficiency composite CO2 capture agent, characterized in that: The high-efficiency composite CO2 capture agent is prepared by the method according to claim 1. The raw materials of the high-efficiency composite CO2 capture agent include, in parts by weight: Main absorbent: 10-50 parts, activator: 5-25 parts, stabilizer: 1-10 parts, corrosion inhibitor: 0.5-5 parts, antioxidant: 0-5 parts, water: 50-250 parts.

3. Application of a high-efficiency composite CO2 capture agent, characterized in that: The application includes using the high-efficiency composite CO2 capture agent obtained by the method described in claim 1 or the high-efficiency composite CO2 capture agent described in claim 2 to capture CO2.

4. The use according to claim 3, characterized in that The application comprises the steps of: The high-efficiency composite CO2 capture agent is used to absorb CO2 in the flue gas and perform a capture reaction to obtain a capture agent-rich liquid; Separating the solid phase stabilizer from the collector rich solution, then adding a desorption aid, and performing a desorption reaction to obtain a regenerated lean solution; Cooling the regenerated lean liquid and then performing solid-liquid separation to obtain a regenerated high-efficiency composite CO2 capture agent; Wherein, the weight portion of the desorption aid is 1 to 5 parts; The capture reaction is carried out in a manner of continuously or intermittently adding a stabilizer.

5. The use according to claim 4, characterized in that The desorption reaction temperature is 90°C to 115°C; and / or, The terminal temperature of the cooling is 20°C to 35°C.

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