Chain-like aliphatic triamine absorbent as well as preparation method and application thereof

Abstract

The invention provides a chain-like aliphatic triamine absorbent as well as a preparation method and application thereof, and relates to the technical field of carbon dioxide capture. The chain-like aliphatic triamine absorbent comprises chain-like aliphatic triamine with a structure as shown in a formula I and a solvent, # imgabs0 # is shown as a formula I; in the formula I, R1 is C1-C2 alkyl; and R2 and R3 are independently H or a C1-C3 alkyl group. According to the chain-like aliphatic triamine, a three-carbon unit with a branched chain is adopted as a basic structure framework, through coupling and compounding of ternary amino active sites, the reaction driving force of the chain-like aliphatic triamine in the carbon dioxide chemical trapping process is enhanced, and then the trapping capacity and the trapping rate are effectively improved. The chain-like aliphatic triamine absorbent provided by the invention has the advantages of high carbon dioxide capture capacity and high capture rate.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide capture, and in particular to a chain fatty triamine absorbent, a preparation method thereof, and an application thereof. Background Art

[0002] Carbon dioxide is the primary greenhouse gas. Excessive industrial carbon emissions can lead to global climate anomalies and local environmental disasters. Carbon capture, utilization, and storage (CCUS) is the most effective means of addressing the current pressure to reduce carbon emissions. The rapid, low-energy carbon capture process forms the premise and foundation of CCUS technology.

[0003] Currently, chemical absorption, exemplified by a 30 wt% ethanolamine solution (Equation 1), remains the most mature and widely used flue gas carbon capture strategy in the industrial sector. It boasts advantages such as rapid response, high CO2 selectivity, wide applicability, and low equipment and material costs. Numerous demonstration plants have been built and put into operation both domestically and internationally. However, structural defects inherent in ethanolamine absorbents limit the number of amine active sites within their molecules, resulting in low CO2 capture capacity and slow capture rates. Furthermore, during recycling, ethanolamine absorbents are commonly subject to issues such as decreased capture efficiency due to thermal / oxidative degradation and the escape of small organic amine molecules.

[0004] The above-mentioned inherent shortcomings limit the further optimization and development of alcoholamine absorbents at the molecular structure level. Therefore, industry and academia urgently need to develop a new generation of non-alcoholamine absorption systems with higher activity in order to improve the capture capacity and reaction driving force from the source.

[0005] . Summary of the Invention

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a chain fatty triamine absorbent and its preparation method and application. The chain fatty triamine absorbent provided by the present invention has the advantages of high capture capacity and fast capture rate, and has good performance in the absorption-desorption cycle of carbon dioxide.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions: In one aspect, the present invention provides a chain fatty triamine absorbent, which comprises a chain fatty triamine having a structure shown in Formula I and a solvent; Formula I; In the formula I, R 1 is a C1~C2 alkyl group; R 2 and R 3 are independently H or C1~C3 alkyl.

[0008] Another aspect of the present invention provides a method for preparing a chain fatty triamine absorbent, the method comprising mixing a chain fatty triamine having a structure shown in Formula I with a solvent; The preparation method of the chain fatty triamine of the structure shown in Formula I comprises the following steps: mixing compound 1 and compound 2, and performing a heating alkylation reaction under closed conditions to obtain the chain fatty triamine of the structure shown in Formula I; ; In the compound 1, R 1 is a C1~C2 alkyl group; in the compound 2, R 2 and R 3 are independently H or C1~C3 alkyl.

[0009] Another aspect of the present invention provides use of the chain fatty triamine absorbent according to the present invention and / or the chain fatty triamine absorbent prepared by the method for preparing the chain fatty triamine absorbent according to the present invention in the field of carbon dioxide capture.

[0010] By adopting the above technical solution, the beneficial effects of the present invention are: The chain fatty triamine provided by the present invention adopts a three-carbon unit with a branched chain as the basic structural skeleton. Through the coupling and compounding of the ternary amine active sites, the reaction driving force of the carbon dioxide chemical absorption process is enhanced, thereby achieving the dual effects of significantly improving the capture capacity and capture rate.

[0011] The present invention provides a method for preparing the chain fatty triamine described in the above technical solution. The preparation method provided by the present invention has fewer operating steps, a simple production process, and is suitable for industrial large-scale synthesis.

[0012] The present invention provides a chain fatty triamine absorbent, comprising the above-mentioned chain fatty triamine and a solvent. Compared with the traditional alcohol amine absorption method, the present invention carries out targeted design and optimization of the absorbent structure at the molecular level, and has the following excellent performance: through the synergistic effect generated by the coupling and compounding between the active sites of the ternary amine group embedded in the branched four-carbon unit skeleton, the intermolecular reaction in the conventional carbon dioxide chemical absorption process is regulated to proceed intramolecularly, thereby greatly enhancing the capture capacity and capture rate. As shown in the test results of the embodiment, the carbon dioxide capture capacity of the chain fatty triamine absorbent provided by the present invention can reach up to 16.2 wt% within 60 minutes under the conditions of 40°C and 0.1 MPa, and the capture rate is 0.27 wt% / min. It shows that the absorbent provided by the present invention has a high capture capacity and a fast capture rate. DETAILED DESCRIPTION

[0013] Hereinafter, the chain fatty triamine absorbent provided by the present invention and its preparation method and application embodiments are described in detail.

[0014] The "range" disclosed in this application is defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundaries of a particular range. The range defined in this way can be inclusive or exclusive of the end values, and can be arbitrarily combined, i.e., any lower limit can be combined with any upper limit to form a range. For example, if a range of 60 to 120 and 80 to 110 is listed for a particular parameter, it is understood that a range of 60 to 110 and 80 to 120 is also expected. In addition, if the minimum range values ​​listed are 1 and 2, and if the maximum range values ​​listed are 3, 4, and 5, then the following ranges can all be expected: 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4, and 2 to 5. In this application, unless otherwise specified, the numerical range "a to b" represents an abbreviation of any real number combination between a and b, wherein a and b are both real numbers. For example, a numerical range of "0-5" indicates that all real numbers between "0-5" are listed herein, and "0-5" is simply an abbreviation for these numerical combinations. Furthermore, stating that a parameter is an integer ≥ 2 is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0015]

Chain fatty triamine absorbent

[0016] The chain fatty triamine used in this aspect adopts a three-carbon unit with a branched chain as the basic structural skeleton. Through the coupling and compounding of the ternary amine active sites, the reaction driving force of the carbon dioxide chemical absorption process is enhanced, thereby achieving the dual effect of significantly improving the capture capacity and capture rate.

[0017] In some embodiments, the chain fatty triamine has a structure shown in any one of Formula I-1 to Formula I-10: Formula I-1, Formula I-2, Formula I-3, Formula I-4, Formula I-5, Formula I-6, Formula I-7, Formula I-8, Formula I-9, Formula I-10.

[0018] In the chain fatty triamine absorbent provided by the present invention, the chain fatty triamine having the structure shown in Formula I accounts for 25% by mass of the chain fatty triamine absorbent.

[0019] In the chain fatty triamine absorbent provided by the present invention, the solvent accounts for 75% by mass of the chain fatty triamine absorbent.

[0020] In one embodiment of the present invention, the solvent is water. The chain fatty triamine absorbent is composed of 25% by weight of chain fatty triamine and 75% by weight of water.

[0021] In summary, the present invention provides a chain fatty triamine absorbent, comprising the above-mentioned chain fatty triamine and a solvent. Compared with the traditional alcohol amine absorption method, the present invention carries out targeted design and optimization of the absorbent structure at the molecular level, and has the following excellent performance: through the synergistic effect produced by the coupling and compounding between the active sites of the ternary amine group embedded in the branched three-carbon unit skeleton, the intermolecular reaction in the conventional carbon dioxide chemical absorption process is regulated to proceed intramolecularly, thereby greatly enhancing the capture capacity and capture rate. As shown in the test results of the embodiment, the carbon dioxide capture capacity of the chain fatty triamine absorbent provided by the present invention can reach up to 16.2 wt% within 60 minutes under the conditions of 40°C and 0.1 MPa, and the capture rate is 0.27wt% / min. It shows that the absorbent provided by the present invention has a high capture capacity and a fast capture rate.

[0022]

Preparation method of chain fatty triamine absorbent

[0023] In the present invention, further, a method for preparing a chain fatty triamine having a structure shown in Formula I comprises the following steps: mixing compound 1 and compound 2, and performing a heating alkylation reaction under closed conditions to obtain a chain fatty triamine having a structure shown in Formula I; ; In the compound 1, R 1 is a C1~C2 alkyl group, such as methyl or ethyl; in the compound 2, R 2 and R 3are independently H or C1~C3 alkyl, such as H, methyl, ethyl, propyl, isopropyl.

[0024] Furthermore, the molar ratio of compound 1 to compound 2 is 1:(4-12.5), which can be 1:(4-10), 1:(4-8), 1:(8-10), or 1:(10-12.5), preferably 1:(4-10), and more preferably 1:(8-10).

[0025] Furthermore, the temperature of the heating alkylation reaction is 60-140°C, optionally 60-120°C, 120-140°C, preferably 60-120°C, more preferably 60-100°C; the heating alkylation reaction time is 10-24 h, preferably 10-16 h, more preferably 10-14 h.

[0026] The invention provides a preparation method of a chain fatty triamine, which has few operation steps, a simple production process and is suitable for industrial large-scale synthesis.

[0027] Furthermore, the present invention has no special requirements for the preparation method of the chain fatty triamine absorbent. In a specific embodiment, the chain fatty triamine and water can be directly mixed evenly.

[0028]

application

[0029] Furthermore, when the chain aliphatic triamine provided by the present invention is used to capture carbon dioxide, the carbon dioxide volume concentration in the mixed gas stream can be, for example, 99%. The mixed gas stream pressure can be, for example, 0.1 MPa. The absorption temperature can be, for example, 40°C. The absorbent regeneration temperature can be, for example, 100°C.

[0030] Furthermore, the present invention has no special requirements for the source of the carbon dioxide-containing mixed gas stream, and any source known in the art can be used, such as power plant flue gas, refinery exhaust gas, steel mill exhaust gas, cement plant exhaust gas, petrochemical plant exhaust gas, water gas, biogas, natural gas or carbonate ore decomposition gas.

[0031] The beneficial effects of the present invention are further illustrated below with reference to the examples.

[0032] In order to make the invention objectives, technical solutions and beneficial technical effects of the present invention clearer, the present invention is further described in detail below with reference to the examples. However, it should be understood that the examples of the present invention are only for the purpose of explaining the present invention and are not intended to limit the present invention, and the examples of the present invention are not limited to the examples given in the specification. In the examples, where no specific experimental conditions or operating conditions are specified, the products were prepared under conventional conditions or under the conditions recommended by the material supplier.

[0033] Furthermore, it should be understood that the one or more method steps mentioned in the present invention do not exclude the presence of other method steps before or after the combination step, or the insertion of other method steps between these explicitly mentioned steps, unless otherwise specified. It should also be understood that the combination connection relationship between one or more devices / apparatuses mentioned in the present invention does not exclude the presence of other devices / apparatuses before or after the combination device / apparatus, or the insertion of other devices / apparatuses between two explicitly mentioned devices / apparatuses, unless otherwise specified. Furthermore, unless otherwise specified, the numbering of each method step is merely a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or to define the scope of the present invention. Changes or adjustments to their relative relationships, without substantially changing the technical content, should also be considered within the scope of the present invention.

[0034] In the following examples, unless otherwise specified, various raw materials of the present invention can be purchased commercially or prepared according to conventional methods in the art.

[0035] Example 1 Synthesis of 2-methyl-1,2,3-propanetriamine I-1

[0036] 1,3-Dichloro-2-methyl-2-propylamine hydrochloride (100 mmol, 17.85 g) and aqueous ammonia (60 mL, 30 wt%, 1000 mmol) were added sequentially to a 150 mL autoclave. The mixture was sealed and reacted at 100°C for 12 h with magnetic stirring at 600 r / min. The autoclave was immersed in an ice-water bath for 0.5 h. The reaction solution was then transferred to a 250 mL separatory funnel and extracted with dichloromethane (100 mL x 2). The resulting organic phase was dried over anhydrous sodium sulfate, and the solvent dichloromethane was removed using a rotary evaporator. 2-methyl-1,2,3-propanetriamine was then distilled under reduced pressure. NMR characterization data: 1 H NMR (400 MHz, CDCl3) δ=1.01 (s, 3H), 2.10-2.19 (m, 4H), consistent with the desired product.

[0037] Example 2 N1 ,N 3 Synthesis of 2-trimethyl-1,2,3-propanetriamine I-2

[0038] 1,3-Dichloro-2-methyl-2-propylamine hydrochloride (100 mmol, 17.85 g) and methylamine aqueous solution (60 mL, 40 wt%, 700 mmol) were added sequentially to a 150 mL autoclave. The mixture was sealed and reacted at 80 °C for 14 h with magnetic stirring at 600 r / min. The autoclave was immersed in an ice-water bath for 0.5 h, and the reaction solution was then transferred to a 250 mL separatory funnel and extracted with dichloromethane (100 mL x 2). The resulting organic phase was dried over anhydrous sodium sulfate, the solvent dichloromethane was removed using a rotary evaporator, and distilled under reduced pressure to obtain N 1 ,N 3 ,2-trimethyl-1,2,3-propanetriamine. NMR characterization data: 1 H NMR (400 MHz, CDCl3) δ=1.03 (s, 3H), 2.13-2.22 (m, 4H), 2.34 (s, 6H), consistent with the target product.

[0039] Example 3 N 1 ,N 3 Synthesis of diethyl-2-methyl-1,2,3-propanetriamine I-3

[0040] 1,3-Dichloro-2-methyl-2-propylamine hydrochloride (100 mmol, 17.85 g) and an aqueous solution of ethylamine (75 mL, 25 wt%, 500 mmol) were sequentially added to a 150 mL autoclave. The mixture was sealed and reacted at 90 °C for 16 h with magnetic stirring at 600 r / min. The autoclave was immersed in an ice-water bath for 0.5 h, and the reaction solution was then transferred to a 250 mL separatory funnel and extracted with dichloromethane (100 mL x 2). The resulting organic phase was dried over anhydrous sodium sulfate, the solvent dichloromethane was removed using a rotary evaporator, and then distilled under reduced pressure to obtain N 1 ,N 3 -Diethyl-2-methyl-1,2,3-propanetriamine. NMR characterization data: 1 H NMR (400 MHz, CDCl3) δ=1.00 (s, 3H), 1.09 (t, 6H), 2.11-2.20 (m, 4H), 2.38 (q, 4H), consistent with the target product.

[0041] Example 4 N 1 ,N 3 -Synthesis of diisopropyl-2-methyl-1,2,3-propanetriamine I-4

[0042] 1,3-Dichloro-2-methyl-2-propylamine hydrochloride (100 mmol, 17.85 g) and an aqueous isopropylamine solution (75 mL, 25 wt%, 400 mmol) were added sequentially to a 150 mL autoclave. The mixture was sealed and reacted at 110 °C for 18 h with magnetic stirring at 600 r / min. The autoclave was immersed in an ice-water bath for 0.5 h, after which the reaction solution was transferred to a 250 mL separatory funnel and extracted with dichloromethane (100 mL x 2). The resulting organic phase was dried over anhydrous sodium sulfate, the solvent dichloromethane was removed using a rotary evaporator, and then distilled under reduced pressure to obtain N 1 ,N 3 -Diisopropyl-2-methyl-1,2,3-propanetriamine. NMR characterization data: 1 HNMR (400 MHz, CDCl3) δ=1.01 (s, 3H), 1.07 (d, 12H), 2.14-2.24 (m, 4H), 2.41(m, 2H), consistent with the target product.

[0043] Example 5 N 1 ,N 1 ,N 3 ,N 3 Synthesis of 2-pentamethyl-1,2,3-propanetriamine I-5

[0044] 1,3-Dichloro-2-methyl-2-propylamine hydrochloride (100 mmol, 17.85 g) and dimethylamine aqueous solution (80 mL, 25 wt%, 550 mmol) were added sequentially to a 150 mL autoclave. The mixture was sealed and reacted at 70 °C for 10 h with magnetic stirring at 600 r / min. The autoclave was immersed in an ice-water bath for 0.5 h, and the reaction solution was then transferred to a 250 mL separatory funnel and extracted with dichloromethane (100 mL x 2). The resulting organic phase was dried over anhydrous sodium sulfate, the solvent dichloromethane was removed using a rotary evaporator, and N was distilled under reduced pressure to obtain N 1 ,N 1 ,N 3 ,N 3 ,2-pentamethyl-1,2,3-propanetriamine. NMR characterization data: 1H NMR (400 MHz, CDCl3) δ=1.02 (s, 3H), 2.16-2.22 (m, 4H), 2.31 (s, 12H), consistent with the target product.

[0045] Example 6 N 1 ,N 1 ,N 3 ,N 3 -Synthesis of Tetraethyl-2-methyl-1,2,3-propanetriamine I-6

[0046] 1,3-Dichloro-2-methyl-2-propylamine hydrochloride (100 mmol, 17.85 g) and diethylamine aqueous solution (90 mL, 25 wt%, 420 mmol) were added sequentially to a 150 mL autoclave. The mixture was sealed and reacted at 60 °C for 20 h with magnetic stirring at 600 r / min. The autoclave was immersed in an ice-water bath for 0.5 h, and the reaction solution was then transferred to a 250 mL separatory funnel and extracted with dichloromethane (100 mL x 2). The resulting organic phase was dried over anhydrous sodium sulfate, the solvent dichloromethane was removed using a rotary evaporator, and distilled under reduced pressure to obtain N 1 ,N 1 ,N 3 ,N 3 -Tetraethyl-2-methyl-1,2,3-propanetriamine. NMR characterization data: 1 HNMR (400 MHz, CDCl3) δ=1.01 (s, 3H), 1.11 (t, 12H), 2.17-2.25 (m, 4H), 2.34 (q, 8H), consistent with the target product.

[0047] Example 7 N 1 ,N 3 -Diethyl-N 1 ,N 3 Synthesis of 2-trimethyl-1,2,3-propanetriamine I-7

[0048] 1,3-Dichloro-2-methyl-2-propylamine hydrochloride (100 mmol, 17.85 g) and methylethylamine aqueous solution (85 mL, 20 wt%, 480 mmol) were added sequentially to a 150 mL autoclave. The mixture was sealed and reacted at 60 °C for 20 h with magnetic stirring at 600 r / min. The autoclave was immersed in an ice-water bath for 0.5 h, and the reaction solution was then transferred to a 250 mL separatory funnel and extracted with dichloromethane (100 mL x 2). The resulting organic phase was dried over anhydrous sodium sulfate, the solvent dichloromethane was removed using a rotary evaporator, and N was distilled under reduced pressure to obtain N 1 ,N 3 -Diethyl-N 1 ,N 3 ,2-trimethyl-1,2,3-propanetriamine. NMR characterization data: 1 H NMR (400 MHz, CDCl3) δ=1.01 (s, 3H), 1.07-1.11 (m, 12H), 2.14-2.20 (m, 4H), 2.30 (q, 4H), consistent with the target product.

[0049] Example 8 Synthesis of 2-ethyl-1,2,3-propanetriamine I-8

[0050] 1,3-Dichloro-2-ethyl-2-propylamine hydrochloride (100 mmol, 19.25 g) and aqueous ammonia (75 mL, 30 wt%, 1250 mmol) were added sequentially to a 150 mL autoclave. The mixture was sealed and reacted at 120 °C for 15 h with magnetic stirring at 600 r / min. The autoclave was immersed in an ice-water bath for 0.5 h, after which the reaction solution was transferred to a 250 mL separatory funnel and extracted with dichloromethane (100 mL x 2). The resulting organic phase was dried over anhydrous sodium sulfate, the solvent dichloromethane was removed using a rotary evaporator, and 2-ethyl-1,2,3-propanetriamine was obtained by vacuum distillation. NMR characterization data: 1 H NMR (400 MHz, CDCl3) δ=0.82 (t, 3H), 1.03 (q, 2H), 2.15-2.21 (m, 4H), consistent with the desired product.

[0051] Example 9 2-Ethyl-N 1 ,N 3 Synthesis of dimethyl-1,2,3-propanetriamine I-9

[0052] 1,3-Dichloro-2-ethyl-2-propylamine hydrochloride (100 mmol, 19.25 g) and methylamine aqueous solution (70 mL, 40 wt%, 820 mmol) were added sequentially to a 150 mL autoclave. The mixture was sealed and reacted at 130 °C for 24 h with magnetic stirring at 600 r / min. The autoclave was immersed in an ice-water bath for 0.5 h, and the reaction solution was then transferred to a 250 mL separatory funnel and extracted with dichloromethane (100 mL x 2). The resulting organic phase was dried over anhydrous sodium sulfate, and the solvent dichloromethane was removed using a rotary evaporator. 2-Ethyl-N-propylamine was then distilled under reduced pressure to obtain the product. 1 ,N 3 -Dimethyl-1,2,3-propanetriamine. NMR characterization data: 1 H NMR (400 MHz, CDCl3) δ=0.85 (t, 3H), 1.03 (q, 2H), 2.16-2.25 (m, 4H), 2.33 (s, 6H), consistent with the target product.

[0053] Example 10 2-Ethyl-N 1 ,N 1 ,N 3 ,N 3 -Synthesis of Tetramethyl-1,2,3-propanetriamine I-10

[0054] 1,3-Dichloro-2-ethyl-2-propylamine hydrochloride (100 mmol, 19.25 g) and dimethylamine solution (95 mL, 25 wt%, 650 mmol) were added sequentially to a 150 mL autoclave. The mixture was sealed and reacted at 140 °C for 22 h with magnetic stirring at 600 r / min. The autoclave was immersed in an ice-water bath for 0.5 h, and the reaction solution was then transferred to a 250 mL separatory funnel and extracted with dichloromethane (100 mL x 2). The resulting organic phase was dried over anhydrous sodium sulfate, and the solvent dichloromethane was removed using a rotary evaporator. 2-Ethyl-N-propylamine was then distilled under reduced pressure to obtain 2-ethyl-N-propylamine. 1 ,N 1 ,N 3 ,N 3 -Tetramethyl-1,2,3-propanetriamine. NMR characterization data: 1 HNMR (400 MHz, CDCl3) δ=0.83 (t, 3H), 1.01 (q, 2H), 2.13-2.20 (m, 4H), 2.32(s, 12H), consistent with the target product.

[0055] Application Example 1 Into a 250 mL round-bottom flask, 25 g of the chain fatty triamine obtained in Examples 1 to 10 and 75 g of deionized water were added. After stirring evenly, carbon dioxide was slowly introduced. The volume concentration of carbon dioxide in the mixed gas stream was 99%, the mixed gas flow rate was 150 mL / min, the pressure was 0.1 MPa, and the absorption temperature was 40°C. The inlet and outlet gas flow rates were recorded in real time using a gas flow meter. The test results of the carbon dioxide capture performance of the chain fatty triamine absorbent are shown in Table 1: Table 1 Carbon dioxide capture performance of chain fatty triamine absorbent

[0056] As shown in Table 1, the chain fatty triamine absorbent provided by the present invention has excellent carbon dioxide absorption effect, among which the performance of I-1, I-2 and I-8 are better than that of conventional diethylenetriamine.

[0057] Application Example 2

[0058] Under magnetic stirring conditions, a 250 mL round-bottom flask containing 100 g of the carbon dioxide saturated chain fatty triamine absorbent in Application Example 1 was placed in an oil bath. The oil bath temperature was raised to 120 °C (regeneration temperature was 100 °C), and the inlet and outlet gas flows were recorded in real time using a gas flow meter. The desorption performance test results of the chain fatty triamine absorbent are shown in Table 2: Table 2 Desorption performance of chain fatty triamine absorbent

[0059] As can be seen from Table 2, the chain fatty triamine absorbent provided by the present invention has a good desorption effect on carbon dioxide, which is better than conventional diethylenetriamine.

[0060] In view of this, the present invention aims to provide a chain fatty triamine solution as a carbon dioxide chemical absorbent, as well as a method for preparing the chain fatty triamine. The chain fatty triamine absorbent provided by the present invention has a high capture capacity, a fast capture rate, and good absorption-desorption cycle performance.

[0061] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

[0062] The numerical values ​​and numerical ranges used in the present invention are for clarification purposes only and are not intended to be limiting. Although the data and numerical ranges set forth in the specific embodiments of the present invention have been measured and recorded as accurately as possible, these data and numerical ranges inevitably contain certain errors, which are inevitably generated by the standard deviations that are generally present in various tests.

Claims

1. A chain fatty triamine absorbent, characterized in that: The chain fatty triamine absorbent comprises a chain fatty triamine having a structure shown in Formula I and a solvent; Formula I; In the formula I, R 1 is a C1~C2 alkyl group; R 2 and R 3 are independently H or C1~C3 alkyl.

2. The chain fatty triamine absorbent according to claim 1, characterized in that: The chain fatty triamine has a structure shown in any one of Formula I-1 to Formula I-10: Formula I-1, Formula I-2, Formula I-3, Formula I-4, Formula I-5, Formula I-6, Formula I-7, Formula I-8, Formula I-9, Formula I-10.

3. The chain fatty triamine absorbent according to claim 1, characterized in that: The mass proportion of the chain fatty triamine with the structure shown in Formula I in the chain fatty triamine absorbent is 25%; the mass proportion of the solvent in the chain fatty triamine absorbent is 75%.

4. The chain fatty triamine absorbent according to claim 1, characterized in that: The solvent is water.

5. The method for preparing the chain fatty triamine absorbent according to any one of claims 1 to 4, characterized in that: The preparation method of the chain fatty triamine absorbent comprises mixing a chain fatty triamine having a structure shown in formula I with a solvent; The preparation method of the chain fatty triamine of the structure shown in Formula I comprises the following steps: mixing compound 1 and compound 2, and performing a heating alkylation reaction under closed conditions to obtain the chain fatty triamine of the structure shown in Formula I; ； In the compound 1, R 1 is a C1~C2 alkyl group; in the compound 2, R 2 and R 3 are independently H or C1~C3 alkyl.

6. The method for preparing the chain fatty triamine absorbent according to claim 5, characterized in that: Also includes any one or more of the following conditions: A1) the molar ratio of compound 1 to compound 2 is 1:(4-12.5); A2) the temperature of the heating alkylation reaction is 60-140°C; A3) The heating alkylation reaction time is 10 to 24 hours.

7. The method for preparing the chain fatty triamine absorbent according to claim 6, characterized in that: Also includes any one or more of the following conditions: A11) the molar ratio of compound 1 to compound 2 is 1:(4-10); A21) The temperature of the heating alkylation reaction is 60-120°C; A31) The heating alkylation reaction time is 10 to 16 hours.

8. Use of the chain fatty triamine absorbent according to any one of claims 1 to 4 and / or the chain fatty triamine absorbent prepared by the method for preparing the chain fatty triamine absorbent according to any one of claims 5 to 7 in the field of carbon dioxide capture.

9. The use according to claim 8, characterized in that When the chain fatty triamine absorbent is used to capture carbon dioxide, any one or more of the following conditions may also be met: B1) The volume concentration of carbon dioxide in the mixed gas stream is 99%; B2) The mixed air flow pressure is 0.1 MPa; B3) The absorption temperature is 40°C; B4) The absorbent regeneration temperature is 100 °C.

Images