Organic amine absorbent suitable for carbon capture from cement kiln flue gas and preparation method and application thereof

Abstract

The application belongs to the technical field of carbon capture, and discloses an organic amine absorbent suitable for carbon capture of cement kiln flue gas, and a preparation method and application thereof. The organic amine absorbent comprises the following components in mass fraction: 3.0-6.0 parts of a main agent, 1.0 parts of an auxiliary agent, 0.1-0.5 parts of a promoter, and 0.1-0.5 parts of a stabilizer. The main agent comprises a binary amine, the auxiliary agent comprises a tertiary amine, and the promoter is one or more of 1,3,5-tri-tert-butylbenzene, tert-butyl acetate, triphenyl carbinol and triphenyl phosphine. The application can take into account high-temperature degradation resistance and selective adsorption of impurities, and simultaneously solves the problems of insufficient high-temperature stability and lack of anti-impurity interference ability of the organic amine absorbent in the prior art.

Description

Technical Field

[0001] This invention belongs to the field of carbon capture technology, specifically relating to an organic amine absorbent suitable for carbon capture of cement kiln flue gas, its preparation method, and its application. Background Technology

[0002] The cement industry accounts for 7%-8% of global industrial CO2 emissions, with flue gas from cement kiln calcination being the primary source. This type of flue gas exhibits significantly different characteristics from those from thermal power plants and steel mills: First, it experiences large temperature fluctuations and is consistently located in the medium-to-high temperature range, making conventional organic amine absorbents prone to oxidative degradation above 80℃, leading to a 3-5 times increase in absorption capacity decay rate; second, it contains complex and high-concentration impurities, particularly SO2. X It reacts with organic amines to form stable amine salts, causing the absorbent to be "permanently deactivated." X This accelerates the oxidation of amine solution, and dust particles easily adhere to the surface of the absorbent to form slurry, clogging equipment pipelines; thirdly, high humidity and high water vapor environment will dilute the effective concentration of absorbent, while aggravating equipment corrosion and shortening the system operation cycle.

[0003] While existing organic amine absorbents for carbon capture can balance absorption and desorption performance, they still have the following problems when applied to cement kiln flue gas conditions:

[0004] Insufficient high-temperature stability: In environments above 60℃, the oxidative degradation rate of organic amines begins to increase, which is far below the tolerance requirements of cement kiln flue gas at normal temperatures.

[0005] Lack of resistance to impurity interference: SO2 present in the carbon capture system x NO x Impurities such as chloride ions and metal ions can accelerate the degradation of organic amines, resulting in a significant reduction in service life and making it impossible to meet the continuous treatment requirements of cement kiln flue gas.

[0006] Therefore, how to develop a composite absorbent that combines high-temperature resistance to degradation and selective adsorption of impurities is a technical problem that needs to be solved in the field of carbon capture absorbents for cement kiln flue gas. Summary of the Invention

[0007] The purpose of this invention is to provide an organic amine absorbent suitable for carbon capture in cement kiln flue gas, in order to solve the technical problem of the lack of organic amine absorbents in the prior art that have both high-temperature resistance to degradation and selective adsorption of impurities.

[0008] The organic amine absorbent for carbon capture in cement kiln flue gas comprises, by weight, the following components: 3.0-6.0 parts of main agent, 1.0 part of auxiliary agent, 0.1-0.5 parts of accelerator, and 0.1-0.5 parts of stabilizer. The main agent includes diamine, the auxiliary agent includes tertiary amine, and the accelerator is one or more of 1,3,5-triter-tert-butylbenzene, tert-butyl acetate, triphenylmethanol, and triphenylphosphine.

[0009] Preferably, the main agent includes one or more of 2-amino-2-methyl-propanol, hydroxyethyl ethylenediamine, N,N-dimethylethylenediamine, 1,3-propanediamine, N,N-dimethyl-1,3-propanediamine, N,N-dimethyl-3-aminopropylamine, and piperazine.

[0010] Preferably, the excipient includes N One or more of methyldiethanolamine, triethanolamine, diethylene glycol monomethyl etheramine, triethylene glycol monomethyl etheramine, and 1-dimethylamino-2-propanol.

[0011] Preferably, the stabilizer is catechol.

[0012] Preferably, the absorbent further includes water as a solvent, and the total mass concentration of the main agent, excipient, promoter and stabilizer is 30-40 wt%.

[0013] Preferably, the organic amine absorbent has the following properties: absorption temperature of 30-50℃, desorption temperature of 110-130℃, absorption load of 0.6-1.0 mol / mol, and circulation capacity of 1.20-1.65 mol / kg.

[0014] The present invention also provides a method for preparing the organic amine absorbent for carbon capture of cement kiln flue gas as described above, comprising:

[0015] S1. Mix the main agent, excipient, accelerator and stabilizer in a warm water bath according to the component ratio of the organic amine absorbent above, and stir for the first time to obtain a mixed solution;

[0016] S2. Place the mixed solution obtained in step S1 in a cold water bath and add the corresponding mass of solvent water according to the above component dosages for a second stirring to obtain a special absorbent for carbon capture of cement kiln flue gas.

[0017] Preferably, in step S1, the temperature of the warm water bath is 30-50℃, the stirring speed for the first stirring is 400-900 r / min, and the stirring time is 20-60 min.

[0018] In step S2, the cold water bath temperature is 10-20℃, the second stirring speed is 300-700 r / min, and the time is 10-40 min.

[0019] The present invention also provides the application of the organic amine absorbent for carbon capture of cement kiln flue gas as described above in the field of carbon dioxide capture.

[0020] In the above applications, the target of carbon dioxide capture is cement kiln flue gas, whose temperature fluctuates between 50-400℃. x The concentration range is 100-3000 mg / Nm³, NO x The concentration range is 200-2000 mg / Nm³, Cl - Concentration range: 100-150 mg / Nm 3 .

[0021] The technical advantages of this invention are as follows: This invention utilizes the selection of the components and dosage of the promoter to accelerate the diffusion and reaction of carbon dioxide in the absorbent, thereby increasing the absorption rate. During desorption, it reduces the viscosity of the absorbent, thus reducing desorption energy consumption. Simultaneously, the large-volume substituents in the improved promoter surround the nitrogen atom of the tertiary amine, forming a spatial barrier that can, to some extent, inhibit the protonation of the tertiary amine and reduce its interaction with Cl. - The combination of these properties enhances stability. Therefore, this invention achieves a balance between high-temperature resistance to degradation and selective adsorption of impurities, while simultaneously addressing the problems of insufficient high-temperature stability and lack of resistance to impurity interference in existing organic amine absorbents. Attached Figure Description

[0022] Figure 1 A schematic diagram of the structure of a carbon capture system using an organic amine absorbent suitable for carbon capture in cement kiln flue gas, according to the present invention. Detailed Implementation

[0023] The following detailed description of the embodiments, with reference to the accompanying drawings, will further illustrate the specific implementation of the present invention, in order to help those skilled in the art to have a more complete, accurate, and in-depth understanding of the inventive concept and technical solution of the present invention.

[0024] like Figure 1 As shown, this invention provides an organic amine absorbent suitable for carbon capture in cement kiln flue gas, comprising the following components by mass: 3.0-6.0 parts of a main agent, 1.0 part of an auxiliary agent, 0.1-0.5 parts of an accelerator, and 0.1-0.5 parts of a stabilizer. The main agent comprises a diamine, the auxiliary agent comprises a tertiary amine, and the accelerator is one or more of 1,3,5-tri-tert-butylbenzene, tert-butyl acetate, triphenylmethanol, and triphenylphosphine. The stabilizer is catechol.

[0025] The absorbent also includes water as a solvent, and the total mass concentration (mass concentration of the active ingredient) of the main agent, excipient, promoter and stabilizer is 30-40 wt%.

[0026] The main agent includes one or more of 2-amino-2-methyl-propanol, hydroxyethyl ethylenediamine, N,N-dimethyl ethylenediamine, 1,3-propanediamine, N,N-dimethyl-1,3-propanediamine, N,N-dimethyl-3-aminopropylamine, and piperazine.

[0027] The excipients include N One or more of methyldiethanolamine, triethanolamine, diethylene glycol monomethyl etheramine, triethylene glycol monomethyl etheramine, and 1-dimethylamino-2-propanol.

[0028] Among the above components, the main absorbent is a diamine, which is the primary active ingredient responsible for reacting chemically with carbon dioxide to achieve its absorption. Diamines have two amino groups, resulting in a higher absorption rate and lower regeneration energy consumption compared to monoamine compounds, thus simultaneously enhancing both the absorption and desorption performance of the absorbent.

[0029] The excipient is composed of tertiary amines, which have the characteristics of slow absorption rate but high regeneration efficiency and low regeneration energy consumption. As an excipient, it can effectively improve the desorption performance of the absorbent.

[0030] Accelerators can promote the diffusion and reaction of carbon dioxide in the absorbent through physical or chemical actions, thereby increasing the absorption rate. Simultaneously, accelerators can reduce the viscosity of the absorbent during desorption, thus reducing desorption energy consumption. In this invention, the selection of the accelerator's components and dosage is a core improvement, and experiments have shown that the addition of the accelerator has a positive effect on improving regeneration efficiency. Cement kiln flue gas contains Cl... - Tertiary amines readily undergo protonation, reacting with negatively charged Cl-. - The formation of stable salts leads to the deactivation of the absorbent. The improved promoter, with its bulky substituents, surrounds the nitrogen atom of the tertiary amine, forming a steric barrier that can, to some extent, suppress the protonation of the tertiary amine and reduce its interaction with Cl-. - The combination of these factors enhances stability.

[0031] The stabilizer used is catechol, which can chelate with metal ions to form complexes, and can also act as a reducing agent to inhibit the oxidative degradation of organic amines, thereby reducing the absorption of SO₂. X NO X Deactivation caused by impurities such as metal ions can extend the service life of the absorbent to some extent.

[0032] The organic amine absorbent provided by this invention has the following performance characteristics: absorption temperature of 30-50℃, desorption temperature of 110-130℃, absorption load of 0.6-1.0 mol / mol, and circulation capacity of 1.20-1.65 mol / kg.

[0033] The specific implementation of this solution is as follows.

[0034] Example 1.

[0035] Prepare 100g of a composite absorbent (solution of organic amine absorbent), wherein the components and their amounts are as follows:

[0036] Main ingredient: 2-amino-2-methyl-propanol 24g;

[0037] Excipient: N-methyldiethanolamine 8g;

[0038] Accelerator: 1,3,5-tri-tert-butylbenzene 2.4g;

[0039] Stabilizer: Catechol 2.4g;

[0040] Solvent: 63.2g of deionized water.

[0041] Example 2.

[0042] Prepare 100g of composite absorbent, wherein the components and their amounts are as follows:

[0043] Main components: 20g of hydroxyethyl ethylenediamine and 8g of piperazine;

[0044] Excipient: Triethanolamine 7g;

[0045] Accelerator: 2.1g tert-butyl acetate;

[0046] Stabilizer: Catechol 2.1g;

[0047] Solvent: 60.8g of deionized water.

[0048] Example 3.

[0049] Prepare 100g of composite absorbent, wherein the components and their amounts are as follows:

[0050] Main components: 16.5g of N,N-dimethyl-1,3-propanediamine and 11g of 1,3-propanediamine;

[0051] Excipient: Diethylene glycol monomethyl etheramine 5.5g;

[0052] Accelerator: Triphenylmethanol 2.75g;

[0053] Stabilizer: Catechol 2.75g;

[0054] Solvent: 61.5g of deionized water.

[0055] Example 4.

[0056] Prepare 100g of composite absorbent, wherein the components and their amounts are as follows:

[0057] Main ingredient: Hydroxyethyl ethylenediamine 24g;

[0058] Excipient: N-methyldiethanolamine 6g;

[0059] Accelerator: Triphenylphosphine 1.8g;

[0060] Stabilizer: Catechol 1.8g;

[0061] Solvent: 66.4g of deionized water.

[0062] Example 5.

[0063] Prepare 100g of composite absorbent, wherein the components and their amounts are as follows:

[0064] Main components: 17g of N,N-dimethyl-1,3-propanediamine and 12.75g of 1,3-propanediamine;

[0065] Excipient: Diethylene glycol monomethyl etheramine 8.5g;

[0066] Accelerator: Triphenylmethanol 0.85g;

[0067] Stabilizer: Catechol 0.85g;

[0068] Solvent: 60.05g of deionized water.

[0069] Example 6.

[0070] Prepare 100g of composite absorbent, wherein the components and their amounts are as follows:

[0071] Main components: 18g of 2-amino-2-methyl-propanol and 9g of piperazine;

[0072] Excipient: Triethanolamine 7.5g;

[0073] Accelerator: Triphenylmethanol 2.25g;

[0074] Stabilizer: 2.25g of catechol;

[0075] Solvent: 61g of deionized water.

[0076] Example 7.

[0077] Prepare 100g of composite absorbent, wherein the components and their amounts are as follows:

[0078] Main components: 16g of hydroxyethyl ethylenediamine and 14g of N,N-dimethyl ethylenediamine;

[0079] Excipient: 1-Dimethylamino-2-propanol 5g;

[0080] Accelerator: 1,3,5-tri-tert-butylbenzene 2.5g;

[0081] Stabilizer: Catechol 2.5g;

[0082] Solvent: 60g of deionized water.

[0083] Example 8.

[0084] Prepare 100g of composite absorbent, wherein the components and their amounts are as follows:

[0085] Main components: 20g of N,N-dimethyl-3-aminopropylamine and 8.8g of piperazine;

[0086] Excipient: Triethylene glycol monomethyl etheramine 9g;

[0087] Accelerator: 0.9g tert-butyl acetate;

[0088] Stabilizer: Catechol 0.9g;

[0089] Solvent: 60.4g of deionized water.

[0090] The present invention also provides a method for preparing the above-mentioned organic amine absorbent, comprising the following steps:

[0091] S1. Mix the main agent, excipient, accelerator and stabilizer in a warm water bath according to the component ratio of the organic amine absorbent mentioned above, and stir for the first time to obtain a mixed solution.

[0092] In this step, the temperature of the warm water bath is 30-50℃, the stirring speed for the first time is 400-900 r / min, and the time is 20-60 min.

[0093] S2. Place the mixed solution obtained in step S1 in a cold water bath and add the corresponding mass of solvent water according to the above component dosages for a second stirring to obtain a special absorbent for carbon capture of cement kiln flue gas.

[0094] In this step, the cold water bath temperature is 10-20℃, the second stirring speed is 300-700r / min, and the time is 10-40min.

[0095] As a comparative example, the applicant also conducted the following experiments.

[0096] Comparative Example 1.

[0097] Prepare 100g of composite absorbent, wherein the components and their amounts are as follows:

[0098] Main ingredient: ethanolamine 30g;

[0099] Solvent: 70g of deionized water.

[0100] Comparative Example 2.

[0101] Prepare 100g of composite absorbent, wherein the components and their amounts are as follows:

[0102] Main ingredient: 2-amino-2-methyl-propanol 24g;

[0103] Excipient: N-methyldiethanolamine 8g;

[0104] Stabilizer: Catechol 2.4g;

[0105] Solvent: 65.6g of deionized water.

[0106] Comparative Example 3.

[0107] Prepare 100g of composite absorbent, wherein the components and their amounts are as follows:

[0108] Main components: 16.5g of N,N-dimethyl-1,3-propanediamine and 11g of 1,3-propanediamine;

[0109] Excipient: Diethylene glycol monomethyl etheramine 5.5g;

[0110] Accelerator: Triphenylmethanol 2.75g;

[0111] Solvent: 64.25g of deionized water.

[0112] Comparative Example 4.

[0113] Prepare 100g of composite absorbent, wherein the components and their amounts are as follows:

[0114] Main components: 16.5g of N,N-dimethyl-1,3-propanediamine and 11g of 1,3-propanediamine;

[0115] Excipient: Diethylene glycol monomethyl etheramine 5.5g;

[0116] Accelerator: Triphenylmethanol 2.75g;

[0117] Stabilizer: Catechol 2.75g;

[0118] Solvent: 61.5g of deionized water.

[0119] Comparative Example 5.

[0120] Prepare 100g of composite absorbent, wherein the components and their amounts are as follows:

[0121] Main components: 5g of N,N-dimethyl-1,3-propanediamine and 5g of 1,3-propanediamine;

[0122] Excipient: Diethylene glycol monomethyl etheramine 21g;

[0123] Accelerator: 5g of triphenylmethanol;

[0124] Stabilizer: 1g of catechol;

[0125] Solvent: 63g of deionized water.

[0126] The corresponding preparation methods for the comparative examples include:

[0127] S1. In Comparative Example 1, the organic amine absorbent uses ethanolamine as a single substance, so there is no need to stir and mix it. In other comparative examples, the corresponding components need to be mixed in a warm water bath according to the component ratio of the organic amine absorbent mentioned above, and stirred for the first time to obtain a mixed solution.

[0128] S2. Place the mixed solution obtained in step S1 or ethanolamine that meets the component ratio in a cold water bath and add the corresponding mass of solvent water according to the above component dosage for a second stirring to obtain a special absorbent for carbon capture of cement kiln flue gas.

[0129] Performance verification: The products obtained in Examples 1-9 of the present invention and the products in Comparative Examples 1-5 were subjected to performance tests. The relevant experimental requirements and performance descriptions are as follows.

[0130] Experiment requirements:

[0131] Absorption process of absorbent: The absorbent is placed under the flue gas of cement kiln at a temperature of 30-50℃ to absorb CO2.

[0132] Absorbent regeneration process: After the absorption reaction is completed, the absorbent is placed in a stirring speed of 600-1000 rpm and an oil bath temperature of 110-130℃ to desorb CO2.

[0133] Absorbent degradation process: After the absorption reaction is completed, the absorbent is placed in the cement kiln flue gas at a pressure of 0.5 MPa and a temperature of 120℃ for accelerated degradation.

[0134] Performance Description:

[0135] Circulation capacity: The difference between the amount of CO2 (mol) absorbed by a unit mass of amine (kg) in the rich solution and the amount of CO2 (mol) enriched by a unit mass of amine (kg) in the lean solution after desorption.

[0136] Absorption load: The amount of CO2 absorbed per unit absorbent (mol / mol).

[0137] Retention rate: The ratio (%) of the organic amine content in the degraded absorbent to the organic amine content in the fresh absorbent.

[0138] Based on the above experiments, the circulation capacity, absorption load, regeneration efficiency, and retention rate of the absorbent were determined and calculated. The results are shown in Tables 1 and 2.

[0139] Table 1: Comparison of Cyclic Capacity and Absorbed Load between Embodiments and Comparative Examples of the Invention

[0140]

[0141] Table 1 shows the performance of the examples and comparative examples in terms of carbon dioxide absorption. It can be seen that the absorption load of Examples 1-9 is higher than that of Comparative Example 1 (conventional 30% wt ethanolamine absorbent), indicating that the present invention has a higher capacity for carbon dioxide absorption and can absorb more carbon dioxide. The cycle capacity and absorption load of Example 1 are both higher than those of Comparative Example 2, indicating that the accelerator can effectively enhance the absorption effect of the absorbent. The cycle capacity and absorption load of Example 3 are both higher than those of Comparative Example 5, indicating that with the same total amount of main agent, excipient, and accelerator, the specific proportions of the components of the present invention can achieve better absorption performance.

[0142] Table 2: Comparison of retention rates between embodiments and comparative examples of the present invention

[0143]

[0144] Table 2 shows the changes in retention rates of the examples and comparative examples over degradation time. The retention rates of Examples 1-4 were higher than those of Comparative Example 1 (traditional 30% wt ethanolamine absorbent) throughout the entire time period, indicating that the present invention has stronger stability and a longer service life under the high temperature and high pressure conditions of cement kiln flue gas. The retention rate of Example 1 was higher than that of Comparative Example 2, indicating that the accelerator of the present invention enhanced the stability of the absorbent to a certain extent. The retention rate of Example 3 was higher than that of Comparative Example 4, indicating that the accelerator of the present invention has a unique dual effect of promoting absorption and enhancing stability compared to absorbents used in the prior art. The retention rate of Example 3 was higher than that of Comparative Example 3, indicating that the stabilizer has a significant effect on improving the stability of the absorbent.

[0145] This invention also provides the application of the above-mentioned organic amine absorbent, applying the above-mentioned organic amine absorbent to a carbon capture system for cement kiln flue gas (such as...). Figure 1 (As shown).

[0146] Cement kiln flue gas has the following characteristics: First, the temperature fluctuates significantly depending on the kiln type and production conditions, with a typical fluctuation range of 50-400℃, and under some conditions, the fluctuation can exceed 150℃; second, the impurities are complex and highly concentrated, including SO₂. X Concentrations can reach 100-3000 mg / Nm 3 NO X Concentrations can reach 200-2000 mg / Nm 3 Without in-depth treatment or co-processing, SO2 concentrations are closer to the upper limit. Even after ultra-low emission retrofitting, SO2 emissions that meet standards... X NO X The concentrations are still no higher than 35 mg / Nm 3 50mg / Nm 3 Cl -The content is usually around 100 mg / Nm 3 If alternative fuels are used, the concentration can reach 120-150 mg / Nm³. 3 Specific measures are still needed; thirdly, the humidity of flue gas is greatly affected by the moisture content of raw materials, air humidity, and fuel type, and the volume fraction is generally between 8% and 16%.

[0147] The cement kiln flue gas carbon capture system includes an absorption tower, a desorption tower, a water scrubbing tower, a heat exchanger, a storage tank, and liquid / gas pipelines. The fluid circulation of the cement kiln flue gas carbon capture system is divided into two parts: absorbent circulation and scrubbing liquid circulation. After pretreatment in the three-in-one water scrubbing tower, the cement kiln flue gas enters the absorption tower via an induced draft fan. The flue gas and the lean absorbent solution come into counter-current contact inside the tower, where CO2 is absorbed by the lean solution. The flue gas after CO2 removal enters the water scrubbing tower, where the lean solution carried by the airflow is washed down and recycled. The decarbonized flue gas is discharged from the top of the tower. The rich absorbent solution is pressurized by a rich solution pump from the bottom of the absorption tower, enters the lean-rich solution heat exchanger for heating, and is then sent to the desorption tower for desorption. The desorbed regeneration gas (mainly CO2 and water vapor) is discharged from the top of the desorption tower, and after passing through the top condenser and gas-liquid separator, high-purity CO2 gas is obtained. After regeneration, the lean liquor is cooled by the lean-rich liquor heat exchanger, pressurized by the lean liquor pump, cooled in the lean liquor cooler, and then returned to the absorption tower, thus completing the cycle of continuous absorption and desorption of CO2 by the absorbent.

[0148] In view of the characteristics of cement kiln flue gas, Figure 1 The carbon capture system shown utilizes the organic amine absorbent provided by this invention. A three-in-one water scrubbing tower achieves integrated treatment to reduce flue gas temperature, decrease harmful impurities, and regulate flue gas humidity, controlling flue gas conditions within a certain range. In this invention, the main agent, excipient, accelerator, and stabilizer all possess good thermal stability, and the large-volume substituents on the accelerator can, to some extent, inhibit the protonation of tertiary amines and reduce their interaction with Cl. - The combination of [various factors]. Stabilizers can combine with SO. X An acid-base neutralization reaction occurs, or it reacts with NO. X A redox reaction occurs, enabling selective adsorption of impurities and protecting other components.

[0149] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. An organic amine absorbent suitable for carbon capture in cement kiln flue gas, characterized in that, The product comprises, by weight, the following components: 3.0-6.0 parts of main agent, 1.0 part of excipient, 0.1-0.5 parts of accelerator, and 0.1-0.5 parts of stabilizer, wherein the main agent includes a diamine, the excipient includes a tertiary amine, the accelerator is one or more of 1,3,5-tri-tert-butylbenzene, tert-butyl acetate, triphenylmethanol, and triphenylphosphine; and the stabilizer is catechol.

2. The organic amine absorbent for carbon capture in cement kiln flue gas according to claim 1, characterized in that, The main agent includes one or more of hydroxyethyl ethylenediamine, N,N-dimethyl ethylenediamine, 1,3-propanediamine, N,N-dimethyl-1,3-propanediamine, and piperazine.

3. The organic amine absorbent for carbon capture in cement kiln flue gas according to claim 1, characterized in that, The excipients include N One or more of methyldiethanolamine, triethanolamine, diethylene glycol monomethyl etheramine, and 1-dimethylamino-2-propanol.

4. An organic amine absorbent for carbon capture in cement kiln flue gas according to claim 1, characterized in that, The absorbent also includes water as a solvent, and the total mass concentration of the main agent, excipient, accelerator and stabilizer is 30-40 wt%.

5. An organic amine absorbent for carbon capture in cement kiln flue gas according to claim 1, characterized in that, The properties of the organic amine absorbent include: absorption temperature of 30-50℃, desorption temperature of 110-130℃, absorption load of 0.6-1.0 mol / mol, and circulation capacity of 1.20-1.65 mol / kg.

6. A method for preparing an organic amine absorbent for carbon capture in cement kiln flue gas according to any one of claims 1-5, characterized in that, include: S1. Mix the main agent, excipient, accelerator and stabilizer in a warm water bath according to the component ratio of the organic amine absorbent above, and stir for the first time to obtain a mixed solution; S2. Place the mixed solution obtained in step S1 in a cold water bath and add the corresponding mass of solvent water according to the above component dosages for a second stirring to obtain a special absorbent for carbon capture of cement kiln flue gas.

7. The method for preparing an organic amine absorbent suitable for carbon capture in cement kiln flue gas according to claim 6, characterized in that, In step S1, the temperature of the warm water bath is 30-50℃, the stirring speed for the first time is 400-900 r / min, and the time is 20-60 min. In step S2, the cold water bath temperature is 10-20℃, the second stirring speed is 300-700 r / min, and the time is 10-40 min.

8. The application of an organic amine absorbent for carbon capture of cement kiln flue gas according to claims 1-5 in the field of carbon dioxide capture.

9. The application of the organic amine absorbent for carbon capture of cement kiln flue gas according to claim 8 in the field of carbon dioxide capture, wherein, The target for carbon dioxide capture is cement kiln flue gas, whose temperature fluctuates between 50-400℃. x The concentration range is 100-3000 mg / Nm³, NO x The concentration range is 200-2000 mg / Nm³, Cl - Concentration range: 100-150 mg / Nm 3 .

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