Polyamine and its preparation method and application

Abstract

The present invention relates to the field of carbon capture technology and discloses a polymeric amine, its preparation method, and application. The polymeric amine has a structure represented by the following formula (1), formula (2), or formula (3), wherein R1, R2, or R3 are each independently a C1-C10 hydrocarbon group, a hydroxyethyl group, a hydroxypropyl group, a hydroxybutyl group, an aminoethyl group, or an aminopropyl group. The polymeric amine of the present invention can form a synergistic effect with carbon dioxide within the nanoscale region of the molecular chain by adjusting the ratio of primary, secondary, and tertiary amines, thereby providing a high-performance carbon absorbent. #imgabs0#

Description

Technical Field

[0001] The present invention relates to the technical field of carbon capture, and in particular to a polymeric amine and a preparation method and application thereof. Background Art

[0002] As the only carbon capture technology that can be commercialized on a large scale, chemical absorption has attracted much attention. The chemical absorption methods reported so far mainly use organic amine substances as carbon dioxide absorbents, and most of them are based on small molecule organic amines. The industry mainly uses alcohol amine absorption methods, such as using substances such as ethanolamine, diethanolamine, triethanolamine, methylethanolamine, methyldiethanolamine or isobutanolamine to absorb carbon dioxide. The most representative of these is the use of a 30% by weight monoethanolamine aqueous solution to absorb carbon dioxide. However, these organic amine absorbent molecules contain a small number of amino groups, a low nitrogen content, a small carbon dioxide absorption capacity, and a low viscosity of the absorbent, and the small molecule compounds are more volatile. Traditional polymeric organic amines are mainly polyethyleneimine (PEI), including linear PEI and branched PEI. Secondary amines are the main component of their molecular structure, and the proportion of primary and tertiary amine structures is extremely low. The absorption rate is slow, and their performance is not enough to absorb carbon dioxide efficiently.

[0003] The absorption capacity, absorption rate, reaction heat, and physical properties of organic amine absorbents, such as viscosity, density, and volatility, are directly related to CO2 absorption efficiency, capture energy consumption, and the operating cost of the entire CO2 capture and storage (CCS) system. In industrial operations, current organic amine absorption processes suffer from high vapor pressure and volatility, resulting in significant amine losses and a significant impact on the equipment's surrounding environment. Therefore, it is often necessary to install recovery towers or water scrubbers after the capture tower to reduce amine escape, but this increases the cost of carbon capture.

[0004] Therefore, a new type of polymeric amine absorbent is developed which is difficult to volatilize, has a high nitrogen content, a strong carbon dioxide absorption capacity, a fast absorption rate, and has a simple synthesis method and is easy to industrially produce. Summary of the Invention

[0005] The purpose of the present invention is to overcome the problems of the existing organic amine carbon dioxide absorbents, such as a small number of amine groups, a low nitrogen content, a small carbon dioxide absorption capacity, low viscosity, volatility, slow absorption rate, and insufficient performance for efficient carbon dioxide absorption. The present invention provides a polymeric amine that is non-volatile, has a high nitrogen content, a strong carbon dioxide absorption capacity, a fast absorption rate, and a simple synthesis method, which is easy to industrialize and produce.

[0006] In order to achieve the above object, the first aspect of the present invention provides a polymeric amine having a structure shown in the following formula (1), formula (2) or formula (3):

[0007]

[0008] Wherein, R1, R2 or R3 are each independently a C1-C10 hydrocarbon group, a hydroxyethyl group, a hydroxypropyl group, a hydroxybutyl group, an aminoethyl group or an aminopropyl group.

[0009] Preferably, the weight average molecular weight of the polymeric amine is 500 to 20,000.

[0010] A second aspect of the present invention provides a method for preparing a polymeric amine, which comprises the following steps: subjecting an amine salt to a polymerization reaction with an initiator to obtain a polymer product, and post-treating the polymer product to obtain the polymeric amine.

[0011] Preferably, the amine salt is an allylamine salt, an N-substituted allylamine salt, and an N,N-disubstituted allylamine salt.

[0012] Preferably, the allylamine salt is allylamine hydrochloride, the N-substituted allylamine salt is N-hydroxyethyl allylamine hydrochloride or N-methyl allylamine hydrochloride, and the N,N-disubstituted allylamine salt is N,N-dihydroxyethyl allylamine hydrochloride or N,N-dimethyl allylamine hydrochloride.

[0013] Preferably, the weight ratio of the allylamine salt, the N-substituted allylamine salt and the N,N-disubstituted allylamine salt is 1:(0.5-2):(0.4-1).

[0014] Preferably, the weight ratio of the amine salt to the initiator is (1-100):1.

[0015] Preferably, the initiator is potassium persulfate and sodium bisulfite, and the weight ratio of potassium persulfate to sodium bisulfite is 1:(0.8-1.2).

[0016] Preferably, the polymerization reaction temperature is 45 to 125° C., and the polymerization reaction time is 4 to 72 hours.

[0017] Preferably, the polymerization reaction is carried out under a nitrogen atmosphere.

[0018] The third aspect of the present invention provides use of the above-mentioned polymeric amine in absorbing carbon dioxide.

[0019] Compared with the prior art, the above technical solution of the present invention has the following advantages:

[0020] 1. The polymeric amine structure of the present invention has the characteristic of high nitrogen content, low vapor pressure, low volatility, strong carbon dioxide absorption capacity, fast absorption speed and large absorption capacity, which is conducive to the reaction with carbon dioxide.

[0021] 2. The synthesis method of the polymeric amine of the present invention is simple and easy to industrialize.

[0022] 3. The polymeric amine in the present invention can form a synergistic effect with carbon dioxide in the nanoscale region of the molecular chain by adjusting the ratio of primary amine, secondary amine and tertiary amine, and is a carbon absorbent with good performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a graph of CO2 concentration after simulated flue gas with a CO2 content of 13% by volume passes through a polymeric amine solution. DETAILED DESCRIPTION

[0024] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0025] The endpoints of the ranges and any values ​​disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

[0026] The first aspect of the present invention provides a polymeric amine having a structure as shown in the following formula (1), formula (2) or formula (3):

[0027]

[0028] Wherein, R1, R2 or R3 are each independently a C1-C10 hydrocarbon group, a hydroxyethyl group, a hydroxypropyl group, a hydroxybutyl group, an aminoethyl group or an aminopropyl group.

[0029] In the present invention, the weight average molecular weight of the polymeric amine is 500 to 20,000.

[0030] In the present invention, the weight average molecular weight of the polymeric amine is 500 to 20,000 as measured by gel permeation chromatography (the gel permeation chromatography instrument is a PL-GPC 220 gel permeation chromatography instrument produced by PL Company of the United Kingdom, with tetrahydrofuran (THF) as solvent and styrene standard sample as calibration).

[0031] A second aspect of the present invention provides a method for preparing a polymeric amine, which comprises the following steps: subjecting an amine salt to a polymerization reaction with an initiator to obtain a polymer product, and post-treating the polymer product to obtain the polymeric amine.

[0032] In the present invention, the amine salt is an allylamine salt, an N-substituted allylamine salt and an N,N-disubstituted allylamine salt.

[0033] In the present invention, the allylamine salt is allylamine hydrochloride, the N-substituted allylamine salt is N-hydroxyethyl allylamine hydrochloride or N-methyl allylamine hydrochloride, and the N,N-disubstituted allylamine salt is N,N-dihydroxyethyl allylamine hydrochloride or N,N-dimethyl allylamine hydrochloride.

[0034] In the present invention, the chemical formula of the allylamine hydrochloride is CH2=CH-CH2-NH2·HCl, the chemical formula of the N-hydroxyethylallylamine hydrochloride is CH2=CH-CH2-NH-CH2CH2OH·HCl, the chemical formula of the N-methylallylamine hydrochloride is CH2=CH-CH2-NH-CH3·HCl, the chemical formula of the N,N-dihydroxyethylallylamine hydrochloride is CH2=CH-CH2-N(CH2CH2OH)2·HCl, and the chemical formula of the N,N-dimethylallylamine hydrochloride is CH2=CH-CH2-N(CH3)2·HCl.

[0035] In the present invention, the weight ratio of the allylamine salt, the N-substituted allylamine salt, and the N,N-disubstituted allylamine salt is 1:(0.5-2):(0.4-1). Specifically, the weight ratio of the allylamine salt, the N-substituted allylamine salt, and the N,N-disubstituted allylamine salt can be 1:0.5:0.4, 1:1:0.6, 1:1.5:0.8, or 1:2:1.

[0036] In the present invention, the weight ratio of the amine salt to the initiator is (1-100):1. Preferably, the weight ratio of the amine salt to the initiator is (1-40):1. Specifically, the weight ratio of the amine salt to the initiator can be 1:1, 10:1, 20:1, 30:1 or 40:1.

[0037] In the present invention, the initiators are potassium persulfate and sodium bisulfite, and the weight ratio of the potassium persulfate to the sodium bisulfite is 1:(0.8-1.2). Specifically, the weight ratio of the potassium persulfate to the sodium bisulfite can be 1:0.8, 1:0.9, 1:1 or 1:1.2.

[0038] In the present invention, the polymerization reaction temperature is 45 to 125° C., and the polymerization reaction time is 4 to 72 hours. Specifically, the polymerization reaction temperature can be 45° C., 50° C., 60° C., 70° C., 80° C., 90° C., 100° C., 110° C., 120° C., or 125° C. The polymerization reaction time can be 4 hours, 8 hours, 12 hours, 16 hours, 20 hours, 30 hours, 40 hours, 50 hours, 60 hours, 70 hours, or 72 hours.

[0039] In the present invention, the polymerization reaction is carried out under a nitrogen atmosphere.

[0040] In the present invention, the post-treatment of the polymer product to obtain the polymeric amine comprises the following steps: adding alkali to the solution of the polymer product, and then extracting, separating, drying and evaporating the solution of the polymer product to obtain the polymeric amine.

[0041] In the present invention, a base is added to the solution of the polymer product of the polymerization reaction to adjust the pH of the polymer product to 14. Preferably, the base is a sodium hydroxide solution having a concentration of 10 to 40% by weight. Specifically, the concentration of the sodium hydroxide solution can be 10%, 15%, 20%, 25%, 30%, 35% or 40% by weight.

[0042] In the present invention, dichloromethane is used to extract the polymer product in a separatory funnel, and after the extraction is completed, liquid separation is performed to obtain an organic phase.

[0043] In the present invention, the organic phase is dried using a desiccant, wherein the desiccant is calcium chloride, magnesium sulfate or sodium sulfate. In a preferred embodiment, the desiccant is sodium sulfate.

[0044] The third aspect of the present invention provides use of the above-mentioned polymeric amine in absorbing carbon dioxide.

[0045] The present invention will be described in detail below through embodiments and test examples, but the protection scope of the present invention is not limited thereto.

[0046] Allylamine hydrochloride used in the following examples and comparative examples was purchased from Titan Reagent Company, N-hydroxyethylallylamine hydrochloride was homemade, N,N-dihydroxyethylallylamine hydrochloride was homemade, N-methylallylamine hydrochloride was purchased from Titan Reagent Company, N,N-dimethylallylamine hydrochloride was purchased from Titan Reagent Company, potassium persulfate was purchased from Titan Reagent Company, sodium bisulfite was purchased from Titan Reagent Company, sodium hydroxide was purchased from Titan Reagent Company, dichloromethane was purchased from Titan Reagent Company, and sodium sulfate was purchased from Titan Reagent Company to prepare a sodium hydroxide solution with a concentration of 20% by weight.

[0047] The room temperature in the following examples refers to 25°C. The CO2 concentration (volume %) after absorption by the polymeric amine solution in the following test examples is shown in Table 1, and the CO2 concentration (volume %) after absorption by the monomeric amine solution is shown in Table 2.

[0048] The weight average molecular weight of the polymeric amines in the following examples was determined by using tetrahydrofuran (THF) as solvent and styrene standards for calibration using a PL-GPC 220 gel permeation chromatography instrument from PL Corporation, UK.

[0049] Example 1

[0050] Weigh 15g of amine salts (5g of allylamine hydrochloride, 5g of N-hydroxyethylallylamine hydrochloride, and 5g of N,N-dihydroxyethylallylamine hydrochloride) into a 200mL beaker. Add 85g of water to the beaker to prepare a 15% by weight amine salt solution. Place a 250mL three-necked flask in an electric heating mantle. Add the amine salt solution, 1.5g of initiator (0.75g of potassium persulfate and 0.75g of sodium bisulfite), and a stirrer to the flask. The weight ratio of amine salt to initiator is 10:1. Stir the mixture thoroughly with a glass rod. Then, introduce nitrogen into the flask. Once this preparation is complete, seal the flask with a rubber stopper.

[0051] The electric heating jacket was turned on to carry out the polymerization reaction, and the polymerization temperature was set to 60° C. The reaction was carried out for 24 hours. After the polymerization reaction was completed, a polymer product was obtained, and the polymer product was cooled to room temperature. Then, a sodium hydroxide solution with a concentration of 20% by weight was added to the polymer product until the pH value was adjusted to 14. A dry conical flask was placed at the lower end of the separatory funnel, and then 100 mL of dichloromethane was used to extract in the separatory funnel. After the extraction was completed, the liquid was separated, and the obtained organic phase was directly flowed into the conical flask. 10 g of sodium sulfate was added to the conical flask to dry the organic phase to remove water, and then the organic phase was evaporated to remove the organic solvent dichloromethane to obtain a polymerized amine. The weight of the polymerized amine was 13.1 g, and the molecular weight of the polymerized amine was 2400.

[0052] Example 2

[0053] Weigh 20g of amine salts (5g of allylamine hydrochloride, 10g of N-hydroxyethylallylamine hydrochloride, and 5g of N,N-dihydroxyethylallylamine hydrochloride) into a 200mL beaker. Add 80g of water to the beaker to prepare a 20% by weight amine salt solution. Place a 250mL three-necked flask in an electric heating mantle. Add the amine salt solution, 2g of initiator (1g of potassium persulfate, 1g of sodium bisulfite), and a stirrer to the flask. The weight ratio of amine salt to initiator is 10:1. Stir the mixture thoroughly with a glass rod. Then, introduce nitrogen into the flask. Once this preparation is complete, seal the flask with a rubber stopper.

[0054] The electric heating jacket was turned on to carry out the polymerization reaction, and the polymerization temperature was set to 60° C. The reaction was carried out for 24 hours. After the polymerization reaction was completed, a polymer product was obtained, and the polymer product was cooled to room temperature. Then, a sodium hydroxide solution with a concentration of 20% by weight was added to the polymer product until the pH value was adjusted to 14. A dry conical flask was placed at the lower end of the separatory funnel, and then 100 mL of dichloromethane was used to extract in the separatory funnel. After the extraction was completed, the liquid was separated, and the obtained organic phase was directly flowed into the conical flask. 10 g of sodium sulfate was added to the conical flask to dry the organic phase to remove water, and then the organic phase was evaporated to remove the organic solvent dichloromethane to obtain a polymerized amine. The weight of the polymerized amine was 18.8 g, and the molecular weight of the polymerized amine was 2900.

[0055] Example 3

[0056] Weigh 20g of amine salts (10g of allylamine hydrochloride, 6g of N-hydroxyethylallylamine hydrochloride, and 4g of N,N-dihydroxyethylallylamine hydrochloride) into a 200mL beaker. Add 80g of water to the beaker to prepare a 20% by weight amine salt solution. Place a 250mL three-necked flask in an electric heating mantle. Add the amine salt solution, 2g of initiator (1g of potassium persulfate, 1g of sodium bisulfite), and a stirrer to the flask. The weight ratio of amine salt to initiator is 10:1. Stir the mixture thoroughly with a glass rod. Then, introduce nitrogen into the flask. Once this preparation is complete, seal the flask with a rubber stopper.

[0057] The electric heating jacket was turned on to carry out the polymerization reaction, and the polymerization temperature was set to 60° C. The reaction was carried out for 24 hours. After the polymerization reaction was completed, a polymer product was obtained, and the polymer product was cooled to room temperature. Then, a sodium hydroxide solution with a concentration of 20% by weight was added to the polymer product until the pH value was adjusted to 14. A dry conical flask was placed at the lower end of the separatory funnel, and then 100 mL of dichloromethane was used to extract in the separatory funnel. After the extraction was completed, the liquid was separated, and the obtained organic phase was directly flowed into the conical flask. 10 g of sodium sulfate was added to the conical flask to dry the organic phase to remove water, and then the organic phase was evaporated to remove the organic solvent dichloromethane to obtain a polymerized amine. The weight of the polymerized amine was 18.2 g, and the molecular weight of the polymerized amine was 2200.

[0058] Example 4

[0059] Weigh 15g of amine salts (5g of allylamine hydrochloride, 5g of N-hydroxyethylallylamine hydrochloride, and 5g of N,N-dihydroxyethylallylamine hydrochloride) into a 200mL beaker. Add 85g of water to the beaker to prepare a 15% by weight amine salt solution. Place a 250mL three-necked flask in an electric heating mantle. Add the amine salt solution, 1g of initiator (0.5g of potassium persulfate and 0.5g of sodium bisulfite), and a stirrer to the flask. The weight ratio of amine salt to initiator is 15:1. Stir the mixture thoroughly with a glass rod. Then, introduce nitrogen into the flask. Once this preparation is complete, seal the flask with a rubber stopper.

[0060] The electric heating jacket was turned on to carry out the polymerization reaction, and the polymerization temperature was set to 60° C. The reaction was carried out for 24 hours. After the polymerization reaction was completed, a polymer product was obtained, and the polymer product was cooled to room temperature. Then, a sodium hydroxide solution with a concentration of 20% by weight was added to the polymer product until the pH value was adjusted to 14. A dry conical flask was placed at the lower end of the separatory funnel, and then 100 mL of dichloromethane was used to extract in the separatory funnel. After the extraction was completed, the liquid was separated, and the obtained organic phase was directly flowed into the conical flask. 10 g of sodium sulfate was added to the conical flask to dry the organic phase to remove water, and then the organic phase was evaporated to remove the organic solvent dichloromethane to obtain a polymerized amine. The weight of the polymerized amine was 12.6 g, and the molecular weight of the polymerized amine was 5100.

[0061] Example 5

[0062] Weigh 10g of an amine salt (5g of allylamine hydrochloride and 5g of N,N-dihydroxyethylallylamine hydrochloride) into a 200mL beaker. Add 85g of water to the beaker to prepare a 15% amine salt solution. Place a 250mL three-necked flask in an electric heating mantle. Add the amine salt solution, 1.5g of initiator (0.75g of potassium persulfate and 0.75g of sodium bisulfite), and a stirrer to the flask. The weight ratio of amine salt to initiator is 10:1. Stir the mixture thoroughly with a glass rod. Then, introduce nitrogen into the flask. Once this preparation is complete, seal the flask with a rubber stopper.

[0063] The electric heating jacket was turned on to carry out the polymerization reaction, and the polymerization temperature was set to 60° C. The reaction was carried out for 24 hours. After the polymerization reaction was completed, a polymer product was obtained, and the polymer product was cooled to room temperature. Then, a sodium hydroxide solution with a concentration of 20% by weight was added to the polymer product until the pH value was adjusted to 14. A dry conical flask was placed at the lower end of the separatory funnel, and then 100 mL of dichloromethane was used to extract in the separatory funnel. After the extraction was completed, the liquid was separated, and the obtained organic phase was directly flowed into the conical flask. 10 g of sodium sulfate was added to the conical flask to dry the organic phase to remove water, and then the organic phase was evaporated to remove the organic solvent dichloromethane to obtain a polymerized amine. The weight of the polymerized amine was 8.6 g, and the molecular weight of the polymerized amine was 2300.

[0064] Example 6

[0065] Weigh 15g of amine salts (5g of allylamine hydrochloride, 5g of N-methylallylamine hydrochloride, and 5g of N,N-dimethylallylamine hydrochloride) into a 200mL beaker. Add 85g of water to the beaker to prepare a 15% by weight amine salt solution. Place a 250mL three-necked flask in an electric heating mantle. Add the amine salt solution, 1.5g of initiator (0.75g of potassium persulfate and 0.75g of sodium bisulfite), and a stirrer to the flask. The weight ratio of amine salt to initiator is 10:1. Stir the mixture thoroughly with a glass rod. Then, introduce nitrogen into the flask. Once this preparation is complete, seal the flask with a rubber stopper.

[0066] The electric heating jacket was turned on to carry out the polymerization reaction, and the polymerization temperature was set to 60° C. The reaction was carried out for 24 hours. After the polymerization reaction was completed, a polymer product was obtained, and the polymer product was cooled to room temperature. Then, a sodium hydroxide solution with a concentration of 20% by weight was added to the polymer product until the pH value was adjusted to 14. A dry conical flask was placed at the lower end of the separatory funnel, and then 100 mL of dichloromethane was used to extract in the separatory funnel. After the extraction was completed, the liquid was separated, and the obtained organic phase was directly flowed into the conical flask. 10 g of sodium sulfate was added to the conical flask to dry the organic phase to remove water, and then the organic phase was evaporated to remove the organic solvent dichloromethane to obtain a polymerized amine. The weight of the polymerized amine was 13.4 g, and the molecular weight of the polymerized amine was 2100.

[0067] Test Example 1

[0068] The polymeric amine prepared in Example 1 was dissolved in water to prepare a polymeric amine solution with a concentration of 30 wt%. Simulated flue gas with a CO2 content of 13 vol% was passed into the polymeric amine solution and monitored by a CO2 concentration analyzer. The test results were as follows: Figure 1As shown, it can be clearly observed that the CO2 concentration of the simulated flue gas drops to 3.6% by volume after passing through the polymeric amine solution, indicating that the polymeric amine solution can effectively absorb CO2.

[0069] Test Example 2

[0070] The polyamine prepared in Example 2 was dissolved in water to prepare a 30 wt% polyamine solution. Simulated flue gas with a 13 vol% CO2 content was passed through the polyamine solution. Monitoring with a CO2 concentration analyzer revealed a significant decrease in the CO2 concentration to 2.8 vol% after the simulated flue gas passed through the polyamine solution, demonstrating the effective CO2 absorption capability of the polyamine solution.

[0071] Test Example 3

[0072] The polyamine prepared in Example 3 was dissolved in water to prepare a 30 wt% polyamine solution. Simulated flue gas with a 13 vol% CO2 content was passed through the polyamine solution. Monitoring with a CO2 concentration analyzer revealed that the CO2 concentration in the simulated flue gas dropped to 3.0 vol% after passing through the polyamine solution, demonstrating that the polyamine solution effectively absorbs CO2.

[0073] Test Example 4

[0074] The polyamine prepared in Example 4 was dissolved in water to prepare a 30 wt% polyamine solution. Simulated flue gas with a 13 vol% CO2 content was passed through the polyamine solution. Monitoring with a CO2 concentration analyzer revealed that the CO2 concentration in the simulated flue gas dropped to 3.5 vol% after passing through the polyamine solution, demonstrating that the polyamine solution effectively absorbs CO2.

[0075] Test Example 5

[0076] The polyamine prepared in Example 5 was dissolved in water to prepare a 30 wt% polyamine solution. Simulated flue gas with a 13 vol% CO2 content was passed through the polyamine solution. Monitoring with a CO2 concentration analyzer revealed that the CO2 concentration in the simulated flue gas dropped to 4.2 vol% after passing through the polyamine solution, demonstrating that the polyamine solution effectively absorbs CO2.

[0077] Test Example 6

[0078] The polyamine prepared in Example 6 was dissolved in water to prepare a 30 wt% polyamine solution. Simulated flue gas with a 13 vol% CO2 content was passed through the polyamine solution. Monitoring with a CO2 concentration analyzer revealed a significant decrease in the CO2 concentration to 3.2 vol% after the simulated flue gas passed through the polyamine solution, demonstrating the effective CO2 absorption capability of the polyamine solution.

[0079] Test Example 7

[0080] 13.1 g of N-hydroxyethyl allylamine (structural formula: CH2=CH-CH2-NH-CH2CH2OH) was dissolved in water to prepare a 30 wt% N-hydroxyethyl allylamine solution. Simulated flue gas with a 13 vol% CO2 content was passed through the allylamine solution. Monitoring with a CO2 concentration analyzer revealed that the CO2 concentration in the simulated flue gas dropped to 8.5 vol% after passing through the polymerized amine solution, indicating that the N-hydroxyethyl allylamine solution alone has a poor CO2 absorption capacity.

[0081] Test Example 8

[0082] A 30 wt% N,N-dihydroxyethylallylamine solution was prepared by dissolving 13.1 g of N,N-dihydroxyethylallylamine (structural formula: CH2=CH-CH2-N(CH2CH2OH)2) in water. Simulated flue gas with a 13 vol% CO2 content was passed through the allylamine solution. Monitoring with a CO2 concentration analyzer revealed that the CO2 concentration in the simulated flue gas dropped to 8.3 vol% after passing through the polymerized amine solution, indicating that the N,N-dihydroxyethylallylamine solution alone has a poor CO2 absorption capacity.

[0083] Table 1

[0084]

[0085] Table 2

[0086]

[0087] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, various simple variations of the technical solution of the present invention may be made, including combining the various technical features in any other appropriate manner. These simple variations and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. A method for preparing a polymeric amine, characterized in that: The method comprises the following steps: performing a polymerization reaction on an amine salt and an initiator to obtain a polymerization product, and performing post-treatment on the polymerization product to obtain a polymeric amine; The amine salt is an allylamine salt, an N-substituted allylamine salt, and an N,N-disubstituted allylamine salt; The weight ratio of the allylamine salt, the N-substituted allylamine salt and the N,N-disubstituted allylamine salt is 1:(0.5-2):(0.4-1); The allylamine salt is allylamine hydrochloride, the N-substituted allylamine salt is N-hydroxyethyl allylamine hydrochloride or N-methyl allylamine hydrochloride, and the N,N-disubstituted allylamine salt is N,N-dihydroxyethyl allylamine hydrochloride or N,N-dimethyl allylamine hydrochloride.

2. The method for preparing a polymeric amine according to claim 1, wherein The weight ratio of the amine salt to the initiator is (1-200):

1.

3. The method for preparing a polymeric amine according to claim 1, wherein The initiators are potassium persulfate and sodium bisulfite, and the weight ratio of the potassium persulfate to the sodium bisulfite is 1:(0.8-1.2).

4. The method for preparing a polymeric amine according to claim 1, wherein The polymerization reaction temperature is 45-125° C., and the polymerization reaction time is 4-72 hours.

5. The method for preparing a polymeric amine according to claim 1, wherein The polymerization reaction was carried out under a nitrogen atmosphere.

6. Use of the polymeric amine prepared by the method according to any one of claims 1 to 5 in absorbing carbon dioxide.

Images