Chain fatty triamine absorbent, its preparation method and application

Abstract

This invention provides a chain-like fatty triamine absorbent, its preparation method, and its application, relating to the field of carbon dioxide capture technology. The chain-like fatty triamine absorbent comprises a chain-like fatty triamine with the structure shown in Formula I and a solvent; Formula I; in Formula I, R 1 It is a C1~C2 alkyl group; R 2 and R 3 It is independently H or C1~C3 alkyl. The chain-like aliphatic triamine of the present invention uses a branched three-carbon unit as the basic structural framework. Through the coupling and complexation of the three-amine active sites, the reaction driving force of its carbon dioxide chemical capture process is enhanced, thereby effectively improving the capture capacity and capture rate. The chain-like aliphatic triamine absorbent provided by the present invention has the advantages of high carbon dioxide capture capacity and fast capture rate.

Description

Technical Field

[0001] This invention relates to the field of carbon dioxide capture technology, and in particular to a chain-like fatty triamine absorbent, its preparation method, and its application. Background Technology

[0002] Carbon dioxide is the primary greenhouse gas, and excessive industrial carbon emissions can lead to global climate anomalies and localized environmental disasters. Carbon capture, utilization, and storage (CCUS) technology is the most effective means to address current pressures to reduce carbon emissions, and rapid, low-energy carbon capture processes form the premise and foundation of CCUS technology.

[0003] Currently, the chemical absorption method (reaction formula 1), represented by 30 wt% ethanolamine solution, remains the most mature and widely used flue gas carbon capture strategy in the industrial field. It boasts advantages such as rapid response, high carbon dioxide selectivity, wide applicability, and low equipment and material costs, and several demonstration plants have been built and put into operation both domestically and internationally. However, due to the inherent structural defects of amine absorbents, the number of active amine sites in their molecules is limited, resulting in a relatively low carbon dioxide capture capacity and a slow capture rate. Furthermore, during recycling, amine absorbents commonly suffer from problems such as decreased capture efficiency due to thermal / oxidative degradation and escape of small-molecule organic amines.

[0004] The aforementioned inherent shortcomings limit the further optimization and development of alcohol amine absorbents at the molecular structure level. Therefore, industry and academia urgently need to develop a new generation of non-alcohol amine absorption systems with higher activity in order to improve 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 this invention is to provide a chain-like aliphatic triamine absorbent, its preparation method and application. The chain-like aliphatic triamine absorbent provided by this invention has advantages such as high capture capacity and fast capture rate, and has good performance in the absorption-desorption cycle of carbon dioxide.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0008] The present invention provides a chain-like fatty triamine absorbent, wherein the chain-like fatty triamine absorbent comprises a chain-like fatty triamine with the structure shown in Formula I and a solvent; Formula I;

[0009] In Equation I, R 1 It is a C1~C2 alkyl group; R 2 and R 3 It is independently H or C1~C3 alkyl.

[0010] Another aspect of the present invention provides a method for preparing a chain-like fatty triamine absorbent, the method comprising mixing a chain-like fatty triamine with the structure shown in Formula I with a solvent to obtain the absorbent;

[0011] The preparation method of the chain aliphatic triamine with the structure shown in Formula I includes the following steps: mixing compound 1 and compound 2, and carrying out a heating alkylation reaction under closed conditions to obtain the chain aliphatic triamine with the structure shown in Formula I.

[0012] ;

[0013] In compound 1, R 1 It is a C1~C2 alkyl group; in compound 2, R 2 and R 3 It is independently H or C1~C3 alkyl.

[0014] In another aspect, the present invention provides the application of the chain-like fatty triamine absorbent according to the present invention and / or the chain-like fatty triamine absorbent prepared by the preparation method of the chain-like fatty triamine absorbent according to the present invention in the field of carbon dioxide capture.

[0015] By adopting the aforementioned technical solution, the beneficial effects of the present invention are:

[0016] The chain-like aliphatic triamine provided by this invention uses a three-carbon unit with branched chains as the basic structural framework. Through the coupling and complexation of the three-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] This invention provides a method for preparing the chain-like aliphatic triamine described above. The preparation method provided by this invention has few operation steps, a simple production process, and is suitable for large-scale industrial synthesis.

[0018] This invention provides a chain-like aliphatic triamine absorbent, comprising the aforementioned chain-like aliphatic triamine and a solvent. Compared with the traditional alkanolamine absorption method, this invention features targeted design and optimization of the absorbent structure at the molecular level, resulting in superior performance: through the synergistic effect of coupling and complexation between the active sites of the ternary amine groups embedded in the branched four-carbon unit skeleton, the intermolecular reactions in the conventional carbon dioxide chemical absorption process are controlled to occur intramolecularly, thereby significantly enhancing the capture capacity and capture rate. As shown in the test results of the examples, under conditions of 40 °C and 0.1 MPa, the chain-like aliphatic triamine absorbent provided by this invention can achieve a maximum carbon dioxide capture capacity of 16.2 wt% and a capture rate of 0.27 wt% / min within 60 min. This demonstrates that the absorbent provided by this invention has high capture capacity and fast capture rate. Detailed Implementation

[0019] The following details the implementation of the chain-like fatty triamine absorbent, its preparation method, and its applications provided by the present invention.

[0020] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60~120 and 80~110 are listed for a specific parameter, it is also expected that ranges of 60~110 and 80~120 are also included. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1~3, 1~4, 1~5, 2~3, 2~4, and 2~5. In this application, unless otherwise stated, the numerical range "a~b" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0~5" indicates that all real numbers between "0~5" have been listed in this article; "0~5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0021] [Chain-like fatty triamine absorbent]

[0022] This invention provides a chain-like fatty triamine absorbent, which comprises a chain-like fatty triamine with the structure shown in Formula I and a solvent; Formula I;

[0023] In Equation I, R 1 It is a C1~C2 alkyl group, such as methyl or ethyl; R 2 and R 3 It is independently H or C1~C3 alkyl, such as H, methyl, ethyl, propyl, isopropyl.

[0024] The chain-like aliphatic triamine used in this method employs a three-carbon unit with branched chains as the basic structural framework. Through the coupling and complexation of the three-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.

[0025] In some embodiments, the chain-like aliphatic triamine has the structure shown in any one of formulas I-1 to I-10:

[0026] Formula I-1, Formula I-2,

[0027] Formula I-3, Formula I-4,

[0028] Formula I-5, Formula I-6,

[0029] Formula I-7, Formula I-8,

[0030] Formula I-9, Formula I-10.

[0031] In the chain-like fatty triamine absorbent provided by the present invention, the chain-like fatty triamine with the structure shown in Formula I accounts for 25% by mass.

[0032] In the chain-like fatty triamine absorbent provided by the present invention, the solvent accounts for 75% of the mass of the chain-like fatty triamine absorbent.

[0033] In one embodiment of the present invention, the solvent is water. The chain-like aliphatic triamine absorbent is composed of 25% by mass of chain-like aliphatic triamine and 75% by mass of water.

[0034] In summary, this invention provides a chain-like aliphatic triamine absorbent comprising the aforementioned chain-like aliphatic triamine and a solvent. Compared to the traditional alkanolamine absorption method, this invention features targeted design and optimization of the absorbent structure at the molecular level, resulting in superior performance: through the synergistic effect of coupling and complexation between the active sites of the three-membered amine groups embedded in the branched three-carbon unit skeleton, the intermolecular reactions in the conventional carbon dioxide chemical absorption process are controlled to occur intramolecularly, thereby significantly enhancing the capture capacity and capture rate. As shown in the test results of the examples, under conditions of 40 °C and 0.1 MPa, the chain-like aliphatic triamine absorbent provided by this invention can achieve a maximum carbon dioxide capture capacity of 16.2 wt% and a capture rate of 0.27 wt% / min within 60 min. This demonstrates that the absorbent provided by this invention has high capture capacity and fast capture rate.

[0035] [Preparation method of chain-like fatty triamine absorbent]

[0036] The present invention also provides a method for preparing a chain-like fatty triamine absorbent, wherein the method comprises mixing a chain-like fatty triamine with the structure shown in Formula I with a solvent.

[0037] In this invention, the method for preparing the chain-like aliphatic triamine with the structure shown in Formula I further includes the following steps: mixing compound 1 and compound 2, and performing a heating alkylation reaction under closed conditions to obtain the chain-like aliphatic triamine with the structure shown in Formula I;

[0038] ;

[0039] In compound 1, R 1 It is a C1-C2 alkyl group, such as methyl or ethyl; in compound 2, R 2 and R 3 It is independently H or C1~C3 alkyl, such as H, methyl, ethyl, propyl, isopropyl.

[0040] Further, 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).

[0041] Furthermore, the temperature of the heating alkylation reaction is 60~140 ℃, preferably 60~120 ℃ or 120~140 ℃, more preferably 60~120 ℃, and more preferably 60~100 ℃; the heating alkylation reaction time is 10~24 h, preferably 10~16 h, and more preferably 10~14 h.

[0042] The present invention provides a method for preparing chain-like aliphatic triamines with few operation steps, a simple production process, and is suitable for large-scale industrial synthesis.

[0043] Furthermore, the present invention does not have special requirements for the preparation method of the chain-like fatty triamine absorbent. In one specific embodiment, the chain-like fatty triamine can be directly mixed with water until homogeneous.

[0044]

application

[0045] The present invention also provides the application of the chain-like fatty triamine absorbent prepared according to the present invention and / or the chain-like fatty triamine absorbent prepared by the preparation method of the chain-like fatty triamine absorbent according to the present invention in the field of carbon dioxide capture.

[0046] Furthermore, when the chain-like aliphatic triamine provided by the present invention is used to capture carbon dioxide, the volume concentration of carbon dioxide in the mixed gas flow can be, for example, 99%. The pressure of the mixed gas flow 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.

[0047] Furthermore, the present invention does not have any special requirements for the source of the carbon dioxide-containing mixed gas flow; any source well known in the art is acceptable, such as flue gas from power plants, tail gas from oil refineries, tail gas from steel plants, tail gas from cement plants, tail gas from petrochemical plants, water gas, biogas, natural gas, or decomposition gas from carbonate ores.

[0048] The beneficial effects of the present invention will be further illustrated below with reference to the embodiments.

[0049] To make the inventive objectives, technical solutions, and beneficial effects of this invention clearer, the invention is further described in detail below with reference to embodiments. However, it should be understood that the embodiments of this invention are merely for illustrative purposes and not for limiting the invention, and the embodiments are not limited to those given in the specification. Unless otherwise specified, specific experimental or operational conditions in the embodiments were prepared under conventional conditions or according to the conditions recommended by the material supplier.

[0050] Furthermore, it should be understood that the existence of other method steps before or after the combined steps, or the insertion of other method steps between these explicitly mentioned steps, does not preclude the existence of other method steps before or after the combined steps, or the insertion of other method steps between these explicitly mentioned steps, unless otherwise stated. It should also be understood that the combined connection relationship between one or more devices / apparatus mentioned in this invention does not preclude the existence of other devices / apparatus before or after the combined devices / apparatus, or the insertion of other devices / apparatus between these explicitly mentioned devices / apparatus, unless otherwise stated. Moreover, unless otherwise stated, the numbering of each method step is merely a convenient tool for identifying each method step, and not for limiting the order of the method steps or limiting the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0051] In the following embodiments, unless otherwise specified, all the raw materials of the present invention are commercially available or prepared according to conventional methods in the art.

[0052] Example 1

[0053] Synthesis of 2-methyl-1,2,3-propanetriamine I-1

[0054]

[0055] 1,3-Dichloro-2-methyl-2-propanediamine hydrochloride (100 mmol, 17.85 g) and ammonia (60 mL, 30 wt%, 1000 mmol) were sequentially added to a 150 mL high-pressure reactor. The reactor was sealed and reacted at 100 °C for 12 h with magnetic stirring at 600 rpm. The reactor was then immersed in an ice-water bath for 0.5 h. The reaction mixture was then transferred to a 250 mL separatory funnel and extracted with dichloromethane (100 mL × 2). The resulting organic phase was dried over anhydrous sodium sulfate, and the dichloromethane solvent was removed using a rotary evaporator. The resulting product was then distilled under reduced pressure to obtain 2-methyl-1,2,3-propanetriamine. NMR characterization data: 1 ¹H NMR (400 MHz, CDCl₃) δ=1.01 (s, 3H), 2.10-2.19 (m, 4H), consistent with the target product.

[0056] Example 2

[0057] N 1 N 3 Synthesis of 2-trimethyl-1,2,3-propanetriamine I-2

[0058]

[0059] 1,3-Dichloro-2-methyl-2-propanamine hydrochloride (100 mmol, 17.85 g) and methylamine aqueous solution (60 mL, 40 wt%, 700 mmol) were sequentially added to a 150 mL high-pressure reactor. The reactor was sealed and reacted at 80 °C for 14 h with magnetic stirring at 600 r / min. The reactor was then immersed in an ice-water bath for 0.5 h. The reaction mixture was then transferred to a 250 mL separatory funnel and extracted with dichloromethane (100 mL × 2). The resulting organic phase was dried over anhydrous sodium sulfate, and the dichloromethane solvent was removed using a rotary evaporator. The resulting product was then distilled under reduced pressure to obtain N₂. 1 N 3 2-Trimethyl-1,2,3-propanetriamine. NMR characterization data: 1 ¹H NMR (400MHz, CDCl₃) δ=1.03 (s, 3H), 2.13-2.22 (m, 4H), 2.34 (s, 6H), consistent with the target product.

[0060] Example 3

[0061] N 1 N 3 Synthesis of 1-Diethyl-2-methyl-1,2,3-propanetriamine I-3

[0062]

[0063] 1,3-Dichloro-2-methyl-2-propanamine hydrochloride (100 mmol, 17.85 g) and ethylamine aqueous solution (75 mL, 25 wt%, 500 mmol) were sequentially added to a 150 mL high-pressure reactor. The reactor was sealed and reacted at 90 °C for 16 h with magnetic stirring at 600 r / min. The reactor was then immersed in an ice-water bath for 0.5 h. The reaction mixture was then transferred to a 250 mL separatory funnel and extracted with dichloromethane (100 mL × 2). The resulting organic phase was dried over anhydrous sodium sulfate, and the dichloromethane solvent was removed using a rotary evaporator. The resulting product was then distilled under reduced pressure to obtain N₂. 1 N 3 -Diethyl-2-methyl-1,2,3-propanetriamine. NMR characterization data: 1 ¹H 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.

[0064] Example 4

[0065] N 1 N 3 Synthesis of 1-diisopropyl-2-methyl-1,2,3-propanetriamine I-4

[0066]

[0067] 1,3-Dichloro-2-methyl-2-propylamine hydrochloride (100 mmol, 17.85 g) and isopropylamine aqueous solution (75 mL, 25 wt%, 400 mmol) were sequentially added to a 150 mL high-pressure reactor. The reactor was sealed and reacted at 110 °C for 18 h with magnetic stirring at 600 r / min. The reactor was then immersed in an ice-water bath for 0.5 h. The reaction mixture was then transferred to a 250 mL separatory funnel and extracted with dichloromethane (100 mL × 2). The resulting organic phase was dried over anhydrous sodium sulfate, and the dichloromethane solvent was removed using a rotary evaporator. The resulting product was then distilled under reduced pressure to obtain N₂. 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.

[0068] Example 5

[0069] N1 N 1 N 3 N 3 Synthesis of 2-pentamethyl-1,2,3-propanetriamine I-5

[0070]

[0071] 1,3-Dichloro-2-methyl-2-propanamine hydrochloride (100 mmol, 17.85 g) and dimethylamine aqueous solution (80 mL, 25 wt%, 550 mmol) were sequentially added to a 150 mL high-pressure reactor. The reactor was sealed and reacted at 70 °C for 10 h with magnetic stirring at 600 r / min. The reactor was then immersed in an ice-water bath for 0.5 h. The reaction mixture was then transferred to a 250 mL separatory funnel and extracted with dichloromethane (100 mL × 2). The resulting organic phase was dried over anhydrous sodium sulfate, and the dichloromethane solvent was removed using a rotary evaporator. The resulting product was then distilled under reduced pressure to obtain N2. 1 N 1 N 3 N 3 2-Pentamethyl-1,2,3-Propanetriamine. NMR characterization data: 1 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.

[0072] Example 6

[0073] N 1 N 1 N 3 N 3 Synthesis of tetraethyl-2-methyl-1,2,3-propanetriamine I-6

[0074]

[0075] 1,3-Dichloro-2-methyl-2-propanamine hydrochloride (100 mmol, 17.85 g) and diethylamine aqueous solution (90 mL, 25 wt%, 420 mmol) were sequentially added to a 150 mL high-pressure reactor. The reactor was sealed and reacted at 60 °C for 20 h with magnetic stirring at 600 r / min. The reactor was then immersed in an ice-water bath for 0.5 h. The reaction mixture was then transferred to a 250 mL separatory funnel and extracted with dichloromethane (100 mL × 2). The resulting organic phase was dried over anhydrous sodium sulfate, and the dichloromethane solvent was removed using a rotary evaporator. The resulting product was then distilled under reduced pressure to obtain N₂. 1 N 1 N 3 N3 -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.

[0076] Example 7

[0077] N 1 N 3 -Diethyl-N 1 N 3 Synthesis of 2-trimethyl-1,2,3-propanetriamine I-7

[0078]

[0079] 1,3-Dichloro-2-methyl-2-propanamine hydrochloride (100 mmol, 17.85 g) and methyl ethylamine aqueous solution (85 mL, 20 wt%, 480 mmol) were sequentially added to a 150 mL high-pressure reactor. The reactor was sealed and reacted at 60 °C for 20 h with magnetic stirring at 600 r / min. The reactor was then immersed in an ice-water bath for 0.5 h. The reaction mixture was then transferred to a 250 mL separatory funnel and extracted with dichloromethane (100 mL × 2). The resulting organic phase was dried over anhydrous sodium sulfate, and the dichloromethane solvent was removed using a rotary evaporator. The resulting product was then distilled under reduced pressure to obtain N2. 1 N 3 -Diethyl-N 1 N 3 2-Trimethyl-1,2,3-propanetriamine. NMR characterization data: 1 ¹H 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.

[0080] Example 8

[0081] Synthesis of 2-ethyl-1,2,3-propanetriamine I-8

[0082]

[0083] 1,3-Dichloro-2-ethyl-2-propanediamine hydrochloride (100 mmol, 19.25 g) and ammonia (75 mL, 30 wt%, 1250 mmol) were sequentially added to a 150 mL high-pressure reactor. The reactor was sealed and reacted at 120 °C for 15 h with magnetic stirring at 600 rpm. The reactor was then immersed in an ice-water bath for 0.5 h. The reaction mixture was then transferred to a 250 mL separatory funnel and extracted with dichloromethane (100 mL × 2). The resulting organic phase was dried over anhydrous sodium sulfate, and the dichloromethane solvent was removed using a rotary evaporator. The resulting product was then distilled under reduced pressure to obtain 2-ethyl-1,2,3-propanetriamine. NMR characterization data: 1 ¹H NMR (400 MHz, CDCl₃) δ=0.82 (t, 3H), 1.03 (q, 2H), 2.15-2.21 (m, 4H), consistent with the target product.

[0084] Example 9

[0085] 2-Ethyl-N 1 N 3 Synthesis of 1,2,3-propanetriamine I-9

[0086]

[0087] 1,3-Dichloro-2-ethyl-2-propanamine hydrochloride (100 mmol, 19.25 g) and methylamine aqueous solution (70 mL, 40 wt%, 820 mmol) were sequentially added to a 150 mL high-pressure reactor. The reactor was sealed and reacted at 130 °C for 24 h with magnetic stirring at 600 r / min. The reactor was then immersed in an ice-water bath for 0.5 h. The reaction mixture was then transferred to a 250 mL separatory funnel and extracted with dichloromethane (100 mL × 2). The resulting organic phase was dried over anhydrous sodium sulfate, and the dichloromethane solvent was removed using a rotary evaporator. The resulting product was then distilled under reduced pressure to obtain 2-ethyl-N... 1 N 3 -Dimethyl-1,2,3-propanetriamine. NMR characterization data: 1 ¹H 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.

[0088] Example 10

[0089] 2-Ethyl-N 1 N 1 N 3 N 3Synthesis of Tetramethyl-1,2,3-Propanetriamine I-10

[0090]

[0091] 1,3-Dichloro-2-ethyl-2-propylamine hydrochloride (100 mmol, 19.25 g) and dimethylamine solution (95 mL, 25 wt%, 650 mmol) were sequentially added to a 150 mL high-pressure reactor. The reactor was sealed and reacted at 140 °C for 22 h with magnetic stirring at 600 r / min. The reactor was then immersed in an ice-water bath for 0.5 h. The reaction mixture was then transferred to a 250 mL separatory funnel and extracted with dichloromethane (100 mL × 2). The resulting organic phase was dried over anhydrous sodium sulfate, and the dichloromethane solvent was removed using a rotary evaporator. The resulting product was then distilled under reduced pressure to obtain 2-ethyl-N... 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.

[0092] Application Example 1

[0093] 25 g of the chain-like aliphatic triamine obtained in Examples 1-10 and 75 g of deionized water were added to a 250 mL round-bottom flask. After stirring evenly, carbon dioxide was slowly introduced. The volume concentration of carbon dioxide in the mixed gas flow was 99%, the 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 results of the carbon dioxide capture performance test of the chain-like aliphatic triamine absorbent are shown in Table 1.

[0094] Table 1. Carbon dioxide capture performance of chain-like aliphatic triamine absorbents

[0095]

[0096] As shown in Table 1, the chain-like aliphatic triamine absorbents provided by the present invention have excellent absorption effects on carbon dioxide, among which I-1, I-2 and I-8 all have better performance than conventional diethylenetriamine.

[0097] Application Example 2

[0098] Under magnetic stirring, a 250 mL round-bottom flask containing 100 g of the chain-like aliphatic triamine absorbent saturated with carbon dioxide from Application Example 1 was placed in an oil bath. The oil bath temperature was raised to 120 ℃ (regeneration temperature is 100 ℃). The inlet and outlet gas flow rates were recorded in real time using a gas flow meter. The desorption performance test results of the chain-like aliphatic triamine absorbent are shown in Table 2.

[0099] Table 2 Desorption performance of chain-like aliphatic triamine absorbents

[0100]

[0101] As shown in Table 2, the chain-like aliphatic triamine absorbent provided by the present invention has a good desorption effect on carbon dioxide, which is superior to that of conventional diethylenetriamine.

[0102] In view of this, the purpose of this invention is to provide a type of chain-like aliphatic triamine solution as a chemical absorbent for carbon dioxide, and a method for preparing such chain-like aliphatic triamines. The chain-like aliphatic triamine absorbent provided by this invention has high capture capacity, fast capture rate, and good absorption-desorption recycling performance.

[0103] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

[0104] The numerical values ​​and ranges used in this invention are clarifications, not limitation. Although the data and ranges stated in certain embodiments of this invention have been measured and recorded with the utmost precision, they inevitably contain certain errors due to the standard deviations present in various tests.

Claims

1. A chain-like fatty triamine absorbent, characterized in that, The chain-like fatty triamine absorbent comprises a chain-like fatty triamine with the structure shown in Formula I and a solvent; Formula I; In Equation I, R 1 It is a C1~C2 alkyl group; R 2 and R 3 Independently, it is H or a C1~C3 alkyl group; Chain-like aliphatic triamines use branched three-carbon units as the basic structural framework, and are coupled and compounded through the active sites of the three amino groups.

2. The chain-like fatty triamine absorbent according to claim 1, characterized in that, Chain-like aliphatic triamines have the structures shown in any one of formulas I-1 to 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-like fatty triamine absorbent according to claim 1, characterized in that, The chain-like fatty triamine with the structure shown in Formula I accounts for 25% by mass in the chain-like fatty triamine absorbent; the solvent accounts for 75% by mass in the chain-like fatty triamine absorbent.

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

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

6. The method for preparing the chain-like fatty triamine absorbent according to claim 5, characterized in that, It also includes 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 for the heating alkylation reaction is 60~140 ℃; A3) The heating alkylation reaction time is 10~24 h.

7. The method for preparing the chain-like fatty triamine absorbent according to claim 6, characterized in that, It also includes one or more of the following conditions: A11) The molar ratio of compound 1 and compound 2 is 1:(4~10). (A21) The temperature for the heating alkylation reaction is 60~120 ℃; The heating alkylation reaction described in A31) takes 10-16 h.

8. The application of the chain-like fatty triamine absorbent prepared according to any one of claims 1 to 4 and / or the chain-like fatty triamine absorbent prepared according to any one of claims 5 to 7 in the field of carbon dioxide capture.

9. The application according to claim 8, characterized in that, When chain-like aliphatic triamine absorbents are used to capture carbon dioxide, they also include one or more of the following conditions: B1) The volume concentration of carbon dioxide in the mixed gas stream is 99%; B2) The pressure of the mixed airflow is 0.1 MPa; B3) The absorption temperature is 40 ℃; B4) The absorbent regeneration temperature is 100 ℃.

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