Efficient decarburizing agent and preparation method thereof

Abstract

The invention relates to the technical field of natural gas decarburization, and particularly discloses an efficient decarburization agent and a preparation method thereof. The invention relates to an efficient decarburizing agent, which is prepared from the following raw materials: 40 to 60 parts of double modified 3-(diethoxymethylsilyl) propylamine; 10 to 25 parts of N-methyl monoethanolamine; 13 to 30 parts of sulfolane; 5 to 15 parts of piperazine; 3-10 parts of an activating component; 5 to 10 parts of deionized water; 0.5-3 parts of a stabilizer; 0.1 to 1 part of an antioxidant; the dual modified 3-(diethoxy methylsilyl) propylamine is obtained by carrying out modification treatment on 3-(diethoxy methylsilyl) propylamine by gamma-aminopropyltriethoxysilane and polyethylene glycol diglycidyl ether. The activating component is prepared from a metal organic framework material and N-vinyl pyrrolidone. The efficient decarburizing agent can be used for decarburizing natural gas, petroleum gas and the like, and has the advantages of being high in adsorption capacity, high in adsorption rate and high in high temperature resistance.

Description

Technical Field

[0001] This application relates to the field of natural gas decarbonization technology, and more specifically, to a highly efficient decarbonization agent and its preparation method. Background Technology

[0002] Natural gas, as a crucial component of clean energy, plays a vital role in energy structure transformation and the achievement of carbon neutrality goals through its efficient utilization. However, natural gas often contains 0.5%-8% by volume of acidic components such as carbon dioxide. These substances not only reduce the calorific value of natural gas but also exacerbate corrosion of metal pipelines during transportation and affect the stability of subsequent liquefaction processes. Decarbonization treatment can reduce the CO2 content in natural gas to ≤2% or ≤50ppm, thereby improving energy efficiency, extending equipment lifespan, and meeting natural gas quality requirements.

[0003] In related technologies, such as the patent document with publication number CN114540089B, a natural gas desulfurization and decarbonization agent and its application method are disclosed. The decarbonization agent components include 40 parts of 3-(diethoxymethylsilyl)propylamine and 60 parts of diethylene glycol dimethyl ether; or 50 parts of 3-(diethoxymethylsilyl)propylamine, 40 parts of diethylene glycol dimethyl ether, and 10 parts of isopropanol; or 60 parts of 3-(diethoxymethylsilyl)propylamine, 20 parts of sulfolane, 10 parts of isopropanol, and 10 parts of diethylene glycol dimethyl ether. In this decarbonization agent, silylamine compounds serve as the core active ingredient, achieving adsorption through acid-base neutralization or salt formation reactions between amino groups and CO2; the organic solvent is used to adjust the system viscosity and improve mass transfer efficiency.

[0004] However, in actual use, when the operating temperature of the decarbonization tower exceeds 60°C, the hydrolysis rate of the silane-based amine compounds accelerates, leading to a decrease in the concentration of active ingredients and consequently a reduction in the CO2 adsorption capacity. Furthermore, the silane-based amines form long-chain polymers or network macromolecules through hydrolysis and condensation, increasing the solution viscosity and thus reducing the mass transfer efficiency of the decarbonization system, further decreasing the CO2 adsorption rate. In summary, the decarbonization agents in this technology suffer from insufficient high-temperature stability. Summary of the Invention

[0005] To improve the high-temperature stability of decarbonizing agents and ensure that they have better adsorption capacity and adsorption rate under high-temperature conditions, this application provides a high-efficiency decarbonizing agent and its preparation method.

[0006] The high-efficiency decarbonization agent provided in this application adopts the following technical solution: A highly efficient decarbonizing agent comprises the following raw materials by weight: 40-60 parts of double-modified 3-(diethoxymethylsilyl)propylamine; 10-25 parts of N-methylmonoethanolamine; 13-30 parts of sulfolane; Piperazine 5-15 parts; 3-10 parts of activating component; 5-10 parts deionized water; Stabilizer 0.5-3 parts; Antioxidant 0.1-1 part; The dual-modified 3-(diethoxymethylsilyl)propylamine was obtained by modifying 3-(diethoxymethylsilyl)propylamine with γ-aminopropyltriethoxysilane and polyethylene glycol diglycidyl ether. The activating components include metal-organic framework materials and N-vinylpyrrolidone.

[0007] By employing the above technical solution, aminopropyl silane groups are introduced onto the surface of 3-(diethoxymethylsilyl)propylamine molecules via γ-aminopropyltriethoxysilane. The aminopropyl silane groups possess certain chemical activity, and their structural characteristics facilitate subsequent modification reactions and enhance the adsorption capacity for carbon dioxide. Simultaneously, this modification alters the electron cloud distribution and spatial structure of the original molecule to some extent, laying the foundation for preventing high-temperature hydrolysis. The amino groups in the preliminary modified product undergo a ring-opening reaction with the epoxy groups of polyethylene glycol diglycidyl ether. The polyethylene glycol segments are hydrophilic and can form a coating layer on the molecular surface. This coating layer has a significant steric hindrance effect, preventing water molecules from approaching the core structure of silane-based amine compounds, thereby effectively preventing hydrolysis of silane-based amine compounds under high-temperature conditions. This avoids the problem of increased solution viscosity caused by hydrolysis-condensation forming long-chain polymers or network macromolecules, thus ensuring the mass transfer efficiency of the decarbonization system at high temperatures. On the other hand, the hydrophilicity of polyethylene glycol segments enables them to interact with carbon dioxide molecules, increasing the adsorption capacity for carbon dioxide. The metal-organic framework material in the activating component possesses a high specific surface area and a regular pore structure, providing numerous adsorption sites and exhibiting strong adsorption capacity for carbon dioxide molecules. N-vinylpyrrolidone improves the dispersibility of the metal-organic framework material in the decarbonizing agent system, allowing it to better exert its adsorption effect. Together, these two components synergistically increase the adsorption capacity of the decarbonizing agent for carbon dioxide. Therefore, the decarbonizing agent of this application exhibits good high-temperature stability, ensuring optimal adsorption capacity and rate under high-temperature conditions.

[0008] Optionally, the dual-modified 3-(diethoxymethylsilyl)propylamine is prepared by the following method: A. Mix 3-(diethoxymethylsilyl)propylamine with a solution of γ-aminopropyltriethoxysilane, then add toluenesulfonic acid, and stir the mixture at 40-60°C for 2-4 hours under nitrogen protection to obtain a preliminary modified product. B. The preliminary modified product is reacted with polyethylene glycol diglycidyl ether solution at 50-70℃ for 1-3 hours to obtain bis-modified 3-(diethoxymethylsilyl)propylamine.

[0009] By employing the above technical solution, the first step of the reaction is carried out at 40-60℃ under nitrogen protection. The suitable temperature and protective atmosphere ensure a stable reaction, avoid side reactions, and effectively introduce the aminopropyl silane group. Toluenesulfonic acid, as a catalyst, helps to increase the reaction rate of introducing the aminopropyl silane group. The second step is carried out at 50-70℃. This temperature range is conducive to the full reaction between polyethylene glycol diglycidyl ether and the initially modified product, forming a stable polyethylene glycol segment encapsulation layer. By precisely controlling the reaction conditions, the stability of the dual-modified product is ensured, thereby better achieving the effects of improving high-temperature stability, increasing adsorption capacity, and improving adsorption rate.

[0010] Optionally, in step A, the mass concentration of the γ-aminopropyltriethoxysilane solution is 5%-10%; the mass ratio of 3-(diethoxymethylsilyl)propylamine to the γ-aminopropyltriethoxysilane solution is 1:(0.4-0.6).

[0011] Optionally, in step A, the amount of toluenesulfonic acid added is 1.5%-2.5% of the total mass of the solutions of 3-(diethoxymethylsilyl)propylamine and γ-aminopropyltriethoxysilane.

[0012] By adopting the above technical solution, toluenesulfonic acid, as a catalyst, can accelerate the first-step modification reaction rate and improve production efficiency when added in an appropriate amount. Simultaneously, a suitable catalyst dosage ensures the reaction proceeds fully, effectively introducing the aminopropyl silane group, laying the foundation for the subsequent formation of a stable dual-modified structure, and improving the high-temperature stability and adsorption performance of the decarbonizing agent.

[0013] Optionally, in step B, the mass concentration of the polyethylene glycol diglycidyl ether solution is 3%-8%; the mass ratio of the preliminary modified product to the polyethylene glycol diglycidyl ether solution is 1:(0.4-0.8).

[0014] Optionally, the activating component includes 20%-40% metal-organic framework material and 60%-80% N-vinylpyrrolidone.

[0015] The aforementioned proportion of activating components allows the high specific surface area and strong adsorption capacity of the metal-organic framework material to fully exert a synergistic effect with the dispersing effect of N-vinylpyrrolidone. This ensures sufficient adsorption sites for carbon dioxide adsorption while also enabling the metal-organic framework material to be uniformly dispersed in the decarbonizing agent system, thereby improving adsorption efficiency and increasing the adsorption capacity and rate of the decarbonizing agent.

[0016] Optionally, the metal-organic framework material is either UiO-66-NH2 or MIL-125-NH2.

[0017] Optionally, the stabilizer comprises 2-mercaptobenzothiazole, dilauryl thiodipropionate, and tris(2,4-di-tert-butylphenyl) phosphite in a mass ratio of 1:(1-2):(0.5-1.5).

[0018] The stabilizer system with the above-mentioned ratio effectively enhances the synergistic mechanism of "chelation-decomposition-capture" in the stabilizer system of this application, fundamentally inhibiting the high-temperature hydrolysis and oxidative degradation of silane-based amines, and solving the problem of viscosity increase and mass transfer efficiency decrease caused by hydrolysis and condensation in traditional decarbonizing agents. The above-mentioned stabilizer system effectively improves the high-temperature stability of the decarbonizing agent, which is beneficial for maintaining better adsorption capacity and adsorption rate under high-temperature conditions.

[0019] Optionally, the antioxidant is either DBPC or BHT.

[0020] This application also provides a method for preparing a highly efficient decarbonization agent, using the following technical solution: A method for preparing a highly efficient decarbonizing agent includes the following steps: S1. After heating and melting piperazine, add N-methyl monoethanolamine and mix and stir to form base solution A. Then mix sulfolane and bis-modified 3-(diethoxymethylsilyl) to form base solution B. S2. Add base solution A and base solution B to the mixing tank, then add deionized water and stir for 30-40 minutes. Then add the activating component, stabilizer and antioxidant and stir for 30-45 minutes to obtain a high-efficiency decarbonizing agent.

[0021] By employing the above technical solution, piperazine is first melted by heating and then mixed with N-methylmonoethanolamine to form base solution A. Next, sulfolane and bis-modified 3-(diethoxymethylsilyl)propylamine are mixed to form base solution B. Then, base solutions A and B are added to a mixing vessel, followed by the sequential addition of deionized water, activating components, stabilizers, and antioxidants, followed by stirring and mixing. This stepwise mixing method facilitates thorough and uniform mixing of the raw materials, ensuring that each component can fully exert its function, thereby producing a high-performance, efficient decarbonizing agent that improves its high-temperature stability, adsorption capacity, and adsorption rate.

[0022] In summary, this application has the following beneficial effects: 1. This application utilizes γ-aminopropyltriethoxysilane and polyethylene glycol diglycidyl ether to modify 3-(diethoxymethylsilyl)propylamine. The first step introduces an aminopropylsilyl group, altering the molecular electron cloud distribution and spatial structure, laying the foundation for preventing high-temperature hydrolysis. The second step forms a polyethylene glycol segment encapsulation layer, which, through steric hindrance, effectively prevents water molecules from approaching the core structure of the silane, avoiding hydrolysis-condensation at high temperatures to form long-chain polymers or network macromolecules. This solves the problems of reduced active ingredient concentration, increased solution viscosity, and reduced mass transfer efficiency caused by hydrolysis in traditional decarbonizing agents at high temperatures. Simultaneously, the stabilizer, consisting of 2-mercaptobenzothiazole, dilauryl thiodipropionate, and tris(2,4-di-tert-butylphenyl)phosphite, works synergistically in a specific ratio, fundamentally inhibiting the high-temperature hydrolysis and oxidative degradation of the silane through a "chelation-decomposition-capture" mechanism. This further enhances the high-temperature stability of the decarbonizing agent, ensuring its stable decarbonizing effect even under high-temperature conditions.

[0023] 2. The polyethylene glycol segments of the dual-modified 3-(diethoxymethylsilyl)propylamine in this application are hydrophilic, enabling them to generate dipole-dipole interactions with carbon dioxide molecules, thus increasing their adsorption and binding capacity for carbon dioxide. The metal-organic framework (MOF) material in the activating component possesses a high specific surface area and a regular pore structure, providing numerous adsorption sites and exhibiting strong adsorption capacity for carbon dioxide molecules. N-vinylpyrrolidone improves the dispersibility of the MOF material in the decarbonizing agent system, allowing it to better exert its adsorption effect. The synergistic effect of these two components fully utilizes the high adsorption capacity of the MOF material and the dispersing effect of N-vinylpyrrolidone, ensuring sufficient adsorption sites while ensuring uniform dispersion of the MOF material, thereby improving adsorption efficiency. Furthermore, the amino groups contained in N-methylmonoethanolamine and piperazine, acting as basic groups, can also react with carbon dioxide, further increasing the adsorption capacity of the decarbonizing agent for carbon dioxide.

[0024] 3. The amino groups in the N-methylmonoethanolamine and piperazine in the decarbonizing agent of this application can rapidly undergo acid-base neutralization or salt formation reactions with carbon dioxide, accelerating the process of carbon dioxide transfer from the gas phase to the liquid phase and being adsorbed, thus providing a basis for improving the adsorption rate. Sulfolane, as an organic solvent, has good solubility and suitable viscosity, which can adjust the viscosity of the decarbonizing agent system, improve the mass transfer efficiency of carbon dioxide in it, promote the contact reaction between carbon dioxide and adsorbent components, and thus effectively enhance the adsorption rate of the decarbonizing agent. Detailed Implementation

[0025] The present application will be further described in detail below with reference to the embodiments.

[0026] Preparation example of bis-modified 3-(diethoxymethylsilyl)propylamine Preparation Example 1 Bis-modified 3-(diethoxymethylsilyl)propylamine was prepared by the following method: A. Mix 10 kg of 3-(diethoxymethylsilyl)propylamine with 4 kg of 5% γ-aminopropyltriethoxysilane solution, then add 0.21 kg of toluenesulfonic acid, and stir the mixture at 40 °C for 4 hours under nitrogen protection to obtain the preliminary modified product. B. 10 kg of the preliminary modified product and 4 kg of a 3% polyethylene glycol diglycidyl ether solution were stirred at 50 °C for 3 hours to obtain bis-modified 3-(diethoxymethylsilyl)propylamine.

[0027] Preparation Example 2 Bis-modified 3-(diethoxymethylsilyl)propylamine was prepared by the following method: A. Mix 10 kg of 3-(diethoxymethylsilyl)propylamine with 5 kg of 8% γ-aminopropyltriethoxysilane solution, then add 0.3 kg of toluenesulfonic acid, and stir the mixture at 50°C for 3 hours under nitrogen protection to obtain the preliminary modified product. B. 10 kg of the preliminary modified product and 6 kg of a 5% polyethylene glycol diglycidyl ether solution were stirred at 60 °C for 2 hours to obtain bis-modified 3-(diethoxymethylsilyl)propylamine.

[0028] Preparation Example 3 Bis-modified 3-(diethoxymethylsilyl)propylamine was prepared by the following method: A. Mix 10 kg of 3-(diethoxymethylsilyl)propylamine with 6 kg of 10% γ-aminopropyltriethoxysilane solution, then add 0.4 kg of toluenesulfonic acid, and stir the mixture at 60 °C for 2 hours under nitrogen protection to obtain the preliminary modified product. B. 10 kg of the preliminary modified product and 8 kg of 8% polyethylene glycol diglycidyl ether solution were stirred at 70 °C for 1 hour to obtain bis-modified 3-(diethoxymethylsilyl)propylamine.

[0029] Preparation Example 4 Modified 3-(diethoxymethylsilyl)propylamine was prepared by the following method: 10 kg of 3-(diethoxymethylsilyl)propylamine was mixed with 6 kg of 10% γ-aminopropyltriethoxysilane solution, and then 0.4 kg of toluenesulfonic acid was added. The mixture was stirred at 60 °C for 2 hours under nitrogen protection to obtain modified 3-(diethoxymethylsilyl)propylamine.

[0030] Preparation Example 5 Modified 3-(diethoxymethylsilyl)propylamine was prepared by the following method: 10 kg of 3-(diethoxymethylsilyl)propylamine was reacted with 8 kg of 8% polyethylene glycol diglycidyl ether solution at 70 °C for 1 hour to obtain modified 3-(diethoxymethylsilyl)propylamine.

[0031] Example Example 1 A highly efficient decarbonizing agent, the raw material composition and dosage of which are shown in Table 1, wherein the bis-modified 3-(diethoxymethylsilyl)propylamine is selected from the bis-modified 3-(diethoxymethylsilyl)propylamine prepared in Preparation Example 1; the ratio of the activating component is 20% UiO-66-NH2 and 80% N-vinylpyrrolidone; the stabilizer is 2-mercaptobenzothiazole, dilaurate thiodipropionate and tris(2,4-di-tert-butylphenyl) phosphite in a mass ratio of 1:1:0.5; and the antioxidant is DBPC.

[0032] A method for preparing a highly efficient decarbonizing agent includes the following steps: S1. After heating and melting piperazine, add N-methyl monoethanolamine and mix and stir to form base solution A. Then mix sulfolane and bis-modified 3-(diethoxymethylsilyl) to form base solution B. S2. Add base solution A and base solution B to the mixing tank, then add deionized water, stir and mix for 30 minutes, then add the activating component, stabilizer and antioxidant and stir for 30 minutes to obtain a high-efficiency decarbonizing agent.

[0033] Example 2 A highly efficient decarbonizing agent, the raw material composition and dosage of which are shown in Table 1, wherein the bis-modified 3-(diethoxymethylsilyl)propylamine is selected from the bis-modified 3-(diethoxymethylsilyl)propylamine prepared in Preparation Example 2; the ratio of the activating component is 30% UiO-66-NH2 and 70% N-vinylpyrrolidone; the stabilizer is 2-mercaptobenzothiazole, dilaurate thiodipropionate and tris(2,4-di-tert-butylphenyl) phosphite in a mass ratio of 1:1.5:1; and the antioxidant is DBPC.

[0034] A method for preparing a highly efficient decarbonizing agent includes the following steps: S1. After heating and melting piperazine, add N-methyl monoethanolamine and mix and stir to form base solution A. Then mix sulfolane and bis-modified 3-(diethoxymethylsilyl) to form base solution B. S2. Add base solution A and base solution B to the mixing tank, then add deionized water and stir for 35 minutes. Then add the activating component, stabilizer and antioxidant and stir for 38 minutes to obtain a high-efficiency decarbonizing agent.

[0035] Example 3 A highly efficient decarbonizing agent, the raw material composition and dosage of which are shown in Table 1, wherein the bis-modified 3-(diethoxymethylsilyl)propylamine is selected from the bis-modified 3-(diethoxymethylsilyl)propylamine prepared in Preparation Example 3; the ratio of the activating component is 40% UiO-66-NH2 and 60% N-vinylpyrrolidone; the stabilizer is 2-mercaptobenzothiazole, dilaurate thiodipropionate and tris(2,4-di-tert-butylphenyl)phosphite in a mass ratio of 1:2:1.5; and the antioxidant is DBPC.

[0036] A method for preparing a highly efficient decarbonization agent includes the following steps: S1. After heating and melting piperazine, add N-methyl monoethanolamine and mix and stir to form base solution A. Then mix sulfolane and bis-modified 3-(diethoxymethylsilyl) to form base solution B. S2. Add base solution A and base solution B to the mixing tank, then add deionized water and stir for 40 minutes. Then add the activating component, stabilizer and antioxidant and stir for 45 minutes to obtain a high-efficiency decarbonizing agent.

[0037] Table 1. Raw material composition and dosage (kg) of the decarbonizing agent in Examples 1-3

[0038] Example 4 A highly efficient decarbonizing agent, which differs from Example 1 in that, in this example, MIL-125-NH2 is used in an equal amount to replace UiO-66-NH2 as the metal-organic framework material in the raw material activation component.

[0039] Example 5 A highly efficient decarbonizing agent, which differs from Example 1 in that the antioxidant used in this example is BHT.

[0040] Example 6 A highly efficient decarbonizing agent, which differs from Example 1 in that the raw material stabilizer in this example is replaced by an equal amount of dilauryl thiodipropionate.

[0041] Comparative Example Comparative Example 1 A decarbonizing agent is obtained by uniformly mixing 30 kg of N-aminoethyl-3-aminopropylmethyldimethoxysilane and 70 kg of diethylene glycol dimethyl ether.

[0042] Comparative Example 2 A highly efficient decarbonizing agent, which differs from Example 1 in that the raw materials in this comparative example use an equal amount of modified 3-(diethoxymethylsilyl)propylamine obtained in Preparation Example 4 instead of its double-modified 3-(diethoxymethylsilyl)propylamine.

[0043] Comparative Example 3 A highly efficient decarbonizing agent, which differs from Example 1 in that an equal amount of modified 3-(diethoxymethylsilyl)propylamine prepared in Preparation Example 5 is used instead of its double-modified 3-(diethoxymethylsilyl)propylamine in the raw materials of this comparative example.

[0044] Comparative Example 4 A highly efficient decarbonizing agent, which differs from Example 1 in that no activating component was added to the raw materials of this comparative example, and the difference was made up with deionized water.

[0045] Performance testing 1. Static adsorption capacity test Experimental Method: 50g of decarbonizing agent was placed in a constant-temperature sealed reactor (500mL volume, 3MPa pressure). High-purity N2 (99.99%) was introduced to purge air for 30min. Then, CO2 gas was introduced into the reactor, maintaining a pressure of 1.5MPa, and the mixture was stirred at a constant temperature (300r / min) for 4h. After adsorption equilibrium, the pressure was reduced to atmospheric pressure, and the remaining CO2 concentration was analyzed by gas chromatography. The mass of CO2 adsorbed per unit mass of decarbonizing agent (mg / g) was calculated using the law of conservation of mass. Two groups of samples were prepared for each decarbonizing agent obtained in Examples 1-6 and Comparative Example 4. Adsorption experiments were conducted in constant-temperature sealed reactors at temperatures of 25℃ and 70℃, respectively. The results are shown in Table 2.

[0046] 2. Adsorption rate test Experimental method: 50g of decarbonizing agent was placed in a 500mL high-pressure reactor, and CO2 was introduced to a pressure of 2.0MPa. The reactor was stirred at a constant temperature of 25℃ and 70℃ (500r / min), and the rate of decrease of CO2 partial pressure per unit time was recorded to indirectly characterize the adsorption rate. The results are shown in Table 2.

[0047] Table 2 Detection Results

[0048] As shown in Table 2, in Example 1, under 70°C, the adsorption capacity decreased from 195 mg / g to 186 mg / g, a decrease of approximately 4.6%. The adsorption rate decreased from 8.8 kPa / min to 7.9 kPa / min, a decrease of approximately 10.2%. In Example 2, the adsorption capacity decreased by approximately 4.6%, and the adsorption rate decreased by approximately 12.4%. In Example 3, the adsorption capacity decreased by approximately 7.0%, and the adsorption rate decreased by approximately 14.4%. In Example 4, the adsorption capacity decreased by approximately 3.6%, and the adsorption rate decreased by approximately 10.2%. In comparison, the traditional decarbonizing agent in Comparative Example 1 showed an adsorption capacity decrease of approximately 38.4% and an adsorption rate decrease of approximately 57.9%. Therefore, it is demonstrated that the decarbonizing agent provided in this application has better high-temperature resistance, and the decrease in adsorption capacity and adsorption rate under high-temperature conditions is significantly less than that of traditional decarbonizing agents. The double-modified 3-(diethoxymethylsilyl)propylamine used in this application has a polyethylene glycol segment that forms a steric hindrance layer, inhibiting the hydrolysis of silylamine and reducing viscosity increase; the activating components (UiO-66-NH2 and N-vinylpyrrolidone) synergistically provide adsorption sites and improve dispersibility, thereby enhancing the adsorption stability of the decarbonizing agent at high temperatures.

[0049] In Example 5, the adsorption capacity decreased by approximately 5.1%, and the adsorption rate decreased by approximately 9.4%. This indicates that replacing the antioxidant with BHT provides an antioxidant effect comparable to DBPC and can inhibit the oxidative degradation of silane-based amines; the dual modifiers and the activating component interact stably, and the adsorption performance at high temperatures decreases by a rate similar to that of Example 1.

[0050] In Example 6, the adsorption capacity decreased by approximately 10.7%, and the adsorption rate decreased by approximately 17.2%. Because the stabilizer used was only dilauryl thiodipropionate, it lacked the chelating effect of 2-mercaptobenzothiazole and the free radical scavenging ability of phosphite, and could not effectively inhibit the high-temperature hydrolysis and oxidation of silane-based amines, resulting in a decrease in the concentration of active ingredients, an increase in solution viscosity, a decrease in mass transfer efficiency, and a significant decrease in adsorption performance.

[0051] The adsorption capacity of Comparative Example 2 decreased by approximately 35.6%, and the adsorption rate decreased by approximately 42.3%. 3-(diethoxymethylsilyl)propylamine only introduces aminopropylsilyl groups and lacks the steric hindrance protection of polyethylene glycol segments. At high temperatures, water molecules can still contact the core structure of silylamine, leading to hydrolysis-condensation reactions, increased viscosity, and reduced mass transfer efficiency.

[0052] The adsorption capacity of Comparative Example 3 decreased by approximately 33.5%, and the adsorption rate decreased by approximately 49.4%. 3-(diethoxymethylsilyl)propylamine was only encapsulated by polyethylene glycol without introducing aminopropyl silyl groups to change the molecular structure. The core structure of the silylamine was not stable enough, and hydrolysis could still occur at high temperatures. Furthermore, the polyethylene glycol segments themselves may be degraded by high-temperature oxidation, leading to the failure of the encapsulation layer.

[0053] The adsorption capacity of Comparative Example 4 decreased by approximately 10.9%, and the adsorption rate decreased by approximately 40.2%. Due to the lack of added active components, the decarbonizing agent lacked high specific surface area adsorption sites of metal-organic framework materials, and the dispersing effect of N-vinylpyrrolidone also disappeared. At high temperatures, the decarbonizing agent mainly relied on the reaction of amines with CO2, but the adsorption sites were insufficient, and the mass transfer efficiency decreased due to the increase in viscosity, resulting in an accelerated decline in adsorption performance.

[0054] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high efficiency decarburizer characterized by, Raw materials comprising the following weight components: a double modified 3-(diethoxymethylsilyl) propylamine 40-60 parts; N-methyl monoethanolamine 10-25 parts; sulfolane 13-30 parts; piperazine 5-15 parts; an activating component 3-10 parts; deionized water 5-10 parts; a stabilizer 0.5-3 parts; an antioxidant 0.1-1 part; the double modified 3-(diethoxymethylsilyl) propylamine is obtained by modifying 3-(diethoxymethylsilyl) propylamine with γ-aminopropyl triethoxysilane and polyethylene glycol diglycidyl ether; the activating component comprises a metal organic framework material and N-vinyl pyrrolidone.

2. The high efficiency decarburizer according to claim 1, characterized in that: the double modified 3-(diethoxymethylsilyl) propylamine is prepared by the following method: A. Mix 3-(diethoxymethylsilyl) propylamine with a γ-aminopropyl triethoxysilane solution, then add toluenesulfonic acid, stir at 40-60°C for 2-4 hours under nitrogen protection to obtain a preliminary modified product; B. Stir the preliminary modified product with a polyethylene glycol diglycidyl ether solution at 50-70°C for 1-3 hours to obtain the double modified 3-(diethoxymethylsilyl) propylamine.

3. The high efficiency decarburizer of claim 2, wherein: In step A, the mass concentration of the γ-aminopropyl triethoxysilane solution is 5%-10%; the mass ratio of 3-(diethoxymethylsilyl) propylamine to the γ-aminopropyl triethoxysilane solution is 1:(0.4-0.6).

4. The highly efficient decarburizer according to claim 3, characterized in that: In step A, the amount of toluenesulfonic acid added is 1.5%-2.5% of the total mass of 3-(diethoxymethylsilyl) propylamine and the γ-aminopropyl triethoxysilane solution.

5. The highly efficient decarburizer according to claim 2, characterized in that: In step B, the mass concentration of the polyethylene glycol diglycidyl ether solution is 3%-8%; the mass ratio of the preliminary modified product to the polyethylene glycol diglycidyl ether solution is 1:(0.4-0.8).

6. The highly efficient decarburizer according to claim 1, wherein: The activating component comprises a metal organic framework material 20%-40% and N-vinyl pyrrolidone 60%-80%.

7. The highly efficient decarburizer according to claim 6, characterized in that: The metal organic framework material is any one of UiO-66-NH2 and MIL-125-NH2.

8. The highly efficient decarburizer of claim 1, wherein: The stabilizer comprises 2-mercaptobenzothiazole, dilauryl thiodipropionate and tris(2,4-di-tert-butylphenyl) phosphite in a mass ratio of 1:(1-2):(0.5-1.5).

9. The highly efficient decarburizer of claim 1, wherein: The antioxidant is any one of DBPC and BHT.

10. A method for preparing a high-efficiency decarburizer according to any one of claims 1-9, characterized in that, The method comprises the following steps: S1. After melting the piperazine, add N-methyl monoethanolamine to form a base liquid A, then mix and stir the sulfolane and the double modified 3-(diethoxymethylsilyl) propylamine to form a base liquid B; S2. Add the base liquid A and the base liquid B to a mixing kettle, then add deionized water, stir and mix for 30-40 min, then add the activating component, the stabilizer and the antioxidant, stir for 30-45 min to obtain the high-efficiency decarbonizing agent.

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