A method for adapting to high concentration carbon dioxide capture

Abstract

This invention provides a process and procedure adapted for capturing high concentrations of carbon dioxide, relating to the technical field of carbon dioxide capture. Its purpose is to prepare a mixed amine aqueous solution with good capture and absorption effect as an absorbent, and to capture carbon dioxide from flue gas in an existing experimental setup. By optimizing the feeding ratio of five amine aqueous solutions and the expanding solvent, as well as the temperature of the reaction vessel, carbon dioxide capture is promoted. The five amine aqueous solutions include hydroxyethyl ethylenediamine, monoethanolamine, diethanolamine, diisopropanolamine, and triethylamine. The expanding solvent includes diamino-dimethyl-1-propanol, N-methyldiethanolamine, and diisopropanolamine. This procedure is simple and effective, with a high reaction rate, and can quickly and effectively capture emitted carbon dioxide, making it a greenhouse gas emission reduction technology very suitable for my country's current national conditions.

Description

Technical Field

[0001] This invention relates to the technical field of carbon dioxide capture, and in particular to a process and procedure adapted for capturing high concentrations of carbon dioxide. Background Technology

[0002] In recent years, global climate change has become an increasingly significant threat to our lives. Experts believe that controlling greenhouse gas emissions requires special attention at the national level, and certain emission reduction technologies can significantly reduce emissions in the coming decades.

[0003] The purpose of this invention is to prepare a mixed amine aqueous solution with good capture and absorption effect as an absorbent, and to capture carbon dioxide in flue gas in an existing experimental device. By optimizing and adjusting the feeding ratio of five amine aqueous solutions and expansion solvent and the temperature of the reaction vessel, the capture of carbon dioxide is promoted. Summary of the Invention

[0004] The present invention adopts the following technical solution:

[0005] A process and flow for capturing high-concentration carbon dioxide, characterized by comprising the following steps:

[0006] A. According to actual needs, weigh a certain amount of hydroxyethyl ethylenediamine and monoethanolamine into a beaker, heat it in a water bath at 30°C, and mechanically stir it for 30 minutes. After stirring, let it stand at 45°C for 2 hours.

[0007] B. Weigh a certain amount of expansion solvent and place it in a beaker. Add the prepared mixed solution of hydroxyethyl ethylenediamine and monoethanolamine dropwise into the expansion solvent, controlling the dropping rate to 20 drops per minute, and heat and stir during this process.

[0008] C. Place the mixed solution of hydroxyethyl ethylenediamine and monoethanolamine in the expansion solvent into a reaction vessel, and adjust the temperature of the reaction vessel to 45°C;

[0009] D. According to actual needs, weigh a certain amount of diethanolamine, diisopropanolamine and triethylamine and place them in a beaker, heat them in a water bath at 45°C and stir mechanically for 60 minutes, and then let them stand at 45°C for 3 hours.

[0010] E. Pour the prepared mixed solution of diethanolamine, diisopropanolamine and triethylamine into the reaction vessel, so that the solution is on the top layer of the reaction vessel, and maintain this state for 30 minutes, so that the temperature of the mixed solution in the reaction vessel reaches 45°C.

[0011] F. A simulated gas with a volume content of 30% carbon dioxide and 70% nitrogen was introduced into the reaction vessel to stabilize the pressure inside the reaction vessel between 1 MPa and 3 MPa.

[0012] G. Simulated gas is added continuously during the reaction to keep the pressure of the reaction vessel between 1 MPa and 3 MPa. Heating is stopped after the reaction has lasted for 4 hours.

[0013] H. The reaction effect was evaluated by analyzing the content of simulated carbon dioxide gas at the inlet and outlet of the reaction vessel.

[0014] A further technical solution is that the purity of the hydroxyethyl ethylenediamine is ≥99.5%. The purity of the monoethanolamine is ≥99.5%. The purity of the diethanolamine is ≥99.5%. The purity of the diisopropanolamine is ≥99.5%. The purity of the triethylamine is ≥99.5%.

[0015] A further technical solution is that the hydroxyethyl ethylenediamine and monoethanolamine are prepared by mixing them in a 5:1 ratio. The diethanolamine, diisopropanolamine, and triethylamine are prepared by mixing them in a 1:1:1 ratio.

[0016] A further technical solution is that the solvent is prepared by mixing diamino-dimethyl-1-propanol, N-methyldiethanolamine, and diisopropanolamine in a 1:1:1 ratio. The diamino-dimethyl-1-propanol has a purity ≥99.7%. The N-methyldiethanolamine has a purity ≥99.7%. The diisopropanolamine has a purity ≥99.7%.

[0017] A further technical solution is that the process method and flow for capturing high concentrations of carbon dioxide is characterized in that, in step 3, the reaction vessel is heated to 45°C under sealed conditions.

[0018] A further technical solution is that the process method and flow for capturing high concentrations of carbon dioxide is characterized in that, in step 6, the simulated gas pressure in the reaction vessel is stabilized at 3 MPa.

[0019] The beneficial effects of this invention are:

[0020] This invention presents a highly efficient process for capturing high concentrations of carbon dioxide. This method offers advantages such as simple operation, low experimental cost, and the use of a highly efficient and reusable absorbent. Furthermore, the main component of the absorbent, hydroxyethyl ethylenediamine, possesses a large absorption capacity, with a maximum absorption capacity of 54 mmol·g. -1 . Attached Figure Description

[0021] Figure 1 This is a graph showing the relationship between reaction time and cumulative carbon dioxide capture in Example 1;

[0022] Figure 2 This is a graph showing the relationship between reaction time and cumulative carbon dioxide capture in Example 2;

[0023] Figure 3 The graph shows the relationship between reaction time and cumulative carbon dioxide capture in Example 3. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0025] The present invention provides a process for capturing high concentrations of carbon dioxide, comprising the following steps:

[0026] First, according to actual needs, weigh a certain amount of hydroxyethyl ethylenediamine and monoethanolamine into a beaker, heat it in a water bath at 30°C, and mechanically stir it for 30 minutes. After stirring, let it stand at 45°C for 2 hours.

[0027] The second step is to weigh a certain amount of expansion solvent and place it in a beaker. Then, drop the prepared mixed solution of hydroxyethyl ethylenediamine and monoethanolamine into the expansion solvent at a rate of 20 drops per minute, and heat and stir during the process.

[0028] The third step involves placing a mixed solution of hydroxyethyl ethylenediamine and monoethanolamine in a solvent in a reaction vessel, and adjusting the temperature of the reaction vessel to 45°C.

[0029] The fourth step is to weigh a certain amount of diethanolamine, diisopropanolamine and triethylamine into a beaker according to actual needs, heat it in a water bath at 45°C and stir it mechanically for 60 minutes. After stirring, let it stand at 45°C for 3 hours.

[0030] Fifth step: Pour the prepared mixed solution of diethanolamine, diisopropanolamine and triethylamine into the reaction vessel, so that the solution is on the top layer of the reaction vessel, and maintain this state for 30 minutes, so that the temperature of the mixed solution in the reaction vessel reaches 45°C.

[0031] The sixth step involves introducing a simulated gas containing 30% carbon dioxide and 70% nitrogen by volume into the reaction vessel to stabilize the pressure inside the reaction vessel between 1 MPa and 3 MPa.

[0032] Step 7: During the reaction, simulated gas is added continuously to keep the pressure in the reaction vessel between 1 MPa and 3 MPa. After the reaction has lasted for 4 hours, heating is stopped.

[0033] The eighth step is to analyze the content of simulated carbon dioxide gas at the inlet and outlet of the reaction vessel to evaluate the reaction effect.

[0034] In this invention, the hydroxyethyl ethylenediamine has a purity ≥ 99.5%. The monoethanolamine has a purity ≥ 99.5%. The diethanolamine has a purity ≥ 99.5%. The diisopropanolamine has a purity ≥ 99.5%. The triethylamine has a purity ≥ 99.5%.

[0035] In this invention, the hydroxyethyl ethylenediamine and monoethanolamine are prepared by mixing them in a 5:1 ratio. The diethanolamine, diisopropanolamine, and triethylamine are prepared by mixing them in a 1:1:1 ratio.

[0036] In this invention, the diluent is prepared by mixing diamino-dimethyl-1-propanol, N-methyldiethanolamine, and diisopropanolamine in a 1:1:1 ratio. The diamino-dimethyl-1-propanol has a purity ≥99.7%. The N-methyldiethanolamine has a purity ≥99.7%. The diisopropanolamine has a purity ≥99.7%.

[0037] The process and flow for capturing high concentrations of carbon dioxide described in this invention are characterized in that, in step 3, the reaction vessel is heated to 45°C under sealed conditions.

[0038] The process and flow for capturing high concentrations of carbon dioxide described in this invention are characterized in that, in step 6, the simulated gas pressure in the reaction vessel is stabilized at 3 MPa.

[0039] Through the above steps, a process method adapted to the capture of high-concentration carbon dioxide can be implemented. The following will design and test experiments based on actual conditions to assess its effectiveness. However, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0040] Example 1:

[0041] Weigh 50g of hydroxyethyl ethylenediamine and 10g of monoethanolamine into a beaker using an electronic balance. Place the beaker in a water bath at 30°C and heat while mechanically stirring for 30 minutes. Then, adjust the water bath temperature to 45°C and let it stand for 2 hours. After 2 hours, weigh 10g of diamino-dimethyl-1-propanol, 10g of N-methyldiethanolamine, and 10g of diisopropanolamine into a beaker and stir to prepare a diffusion solvent. Add the prepared hydroxyethyl ethylenediamine and monoethanolamine mixture dropwise into the diffusion solvent at a rate of 20 drops per minute, while heating and stirring in a water bath at 45°C. Weigh 10g of diethanolamine, 10g of diisopropanolamine, and 10g of triethylamine into a beaker and heat in a water bath at 45°C with mechanical stirring for 60 minutes. After stirring, let it stand at 45°C for 3 hours. Pour the prepared mixed solution of diethanolamine, diisopropanolamine and triethylamine into the reaction vessel, so that the solution is on the top layer of the reaction vessel, and maintain this state for 30 minutes, so that the temperature of the mixed solution in the reaction vessel reaches 45°C.

[0042] A simulated gas with a volume content of 30% carbon dioxide and 70% nitrogen was prepared for the experiment. The simulated gas was introduced into the reaction vessel, and the pressure of the reaction vessel was maintained at 3 MPa. The simulated gas was replenished as needed during the reaction to keep the pressure of the reaction vessel at 3 MPa. After the reaction process lasted for 4 hours, heating was stopped, and the carbon dioxide content of the simulated gas at the inlet and outlet of the reaction vessel was analyzed to evaluate the reaction effect.

[0043] The reaction time and cumulative carbon dioxide capture data are shown below:

[0044]

[0045] Example 2:

[0046] Weigh 40g of hydroxyethyl ethylenediamine and 10g of monoethanolamine into a beaker using an electronic balance. Place the beaker in a 30°C water bath and heat while mechanically stirring for 30 minutes. Then, adjust the water bath temperature to 45°C and let it stand for 2 hours. After 2 hours, weigh 10g of diamino-dimethyl-1-propanol, 10g of N-methyldiethanolamine, and 10g of diisopropanolamine into a beaker and stir to prepare a diffusion solvent. Add the prepared hydroxyethyl ethylenediamine and monoethanolamine mixture dropwise into the diffusion solvent at a rate of 20 drops per minute, while simultaneously heating and stirring in a 45°C water bath. Weigh 10g of diethanolamine, 10g of diisopropanolamine, and 10g of triethylamine into a beaker and heat in a 45°C water bath while mechanically stirring for 60 minutes. After stirring, let it stand at 45°C for 3 hours. Pour the prepared mixed solution of diethanolamine, diisopropanolamine and triethylamine into the reaction vessel, so that the solution is on the top layer of the reaction vessel, and maintain this state for 30 minutes, so that the temperature of the mixed solution in the reaction vessel reaches 45°C.

[0047] A simulated gas with a volume content of 30% carbon dioxide and 70% nitrogen was prepared for the experiment. The simulated gas was introduced into the reaction vessel, and the pressure of the reaction vessel was maintained at 3 MPa. The simulated gas was replenished as needed during the reaction to keep the pressure of the reaction vessel at 3 MPa. After the reaction process lasted for 4 hours, heating was stopped, and the carbon dioxide content of the simulated gas at the inlet and outlet of the reaction vessel was analyzed to evaluate the reaction effect.

[0048] The reaction time and cumulative carbon dioxide capture data are shown below. Compared with Example 1, the cumulative carbon dioxide capture in Example 2 is smaller:

[0049]

[0050] Example 3:

[0051] Weigh 30g of hydroxyethyl ethylenediamine and 10g of monoethanolamine into a beaker using an electronic balance. Place the beaker in a 30°C water bath and heat while mechanically stirring for 30 minutes. Then, adjust the water bath temperature to 45°C and let it stand for 2 hours. After 2 hours, weigh 10g of diamino-dimethyl-1-propanol, 10g of N-methyldiethanolamine, and 10g of diisopropanolamine into a beaker and stir to prepare a diffusion solvent. Add the prepared hydroxyethyl ethylenediamine and monoethanolamine mixture dropwise into the diffusion solvent at a rate of 20 drops per minute, while simultaneously heating and stirring in a 45°C water bath. Weigh 10g of diethanolamine, 10g of diisopropanolamine, and 10g of triethylamine into a beaker and heat in a 45°C water bath while mechanically stirring for 60 minutes. After stirring, let it stand at 45°C for 3 hours. Pour the prepared mixed solution of diethanolamine, diisopropanolamine and triethylamine into the reaction vessel, so that the solution is on the top layer of the reaction vessel, and maintain this state for 30 minutes, so that the temperature of the mixed solution in the reaction vessel reaches 45°C.

[0052] A simulated gas with a volume content of 30% carbon dioxide and 70% nitrogen was prepared for the experiment. The simulated gas was introduced into the reaction vessel, and the pressure of the reaction vessel was maintained at 3 MPa. The simulated gas was replenished as needed during the reaction to keep the pressure of the reaction vessel at 3 MPa. After the reaction process lasted for 4 hours, heating was stopped, and the carbon dioxide content of the simulated gas at the inlet and outlet of the reaction vessel was analyzed to evaluate the reaction effect.

[0053] The reaction time and cumulative carbon dioxide capture data are shown below. Compared with Example 1, the cumulative carbon dioxide capture in Example 3 is smaller:

[0054]

[0055] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for adaptation of high carbon dioxide concentration capture, characterized by, Includes the following steps: Step 1. According to actual needs, weigh a certain amount of hydroxyethyl ethylenediamine and monoethanolamine and place them in a beaker. Heat in a water bath at 30°C and stir mechanically for 30 minutes. After stirring, let stand at 45°C for 2 hours. Step 2. Weigh a certain amount of expansion solvent and place it in a beaker. Add the prepared mixed solution of hydroxyethyl ethylenediamine and monoethanolamine dropwise into the expansion solvent, controlling the dropping rate to 20 drops per minute, and heat and stir during this process. Step 3. Place the mixed solution of hydroxyethyl ethylenediamine and monoethanolamine with the diluent in a reaction vessel, and adjust the temperature of the reaction vessel to 45°C; Step 4. According to actual needs, weigh a certain amount of diethanolamine, diisopropanolamine and triethylamine into a beaker, heat it in a water bath at 45°C and stir mechanically for 60 minutes. After stirring, let it stand at 45°C for 3 hours. Step 5. Pour the prepared mixed solution of diethanolamine, diisopropanolamine and triethylamine into the reaction vessel, so that the solution is on the top layer of the reaction vessel, and maintain this state for 30 minutes to make the temperature of the mixed solution in the reaction vessel reach 45°C. Step 6. Introduce a simulated gas with a volume content of 30% carbon dioxide and 70% nitrogen into the reaction vessel to stabilize the pressure inside the reaction vessel between 1 MPa and 3 MPa. Step 7. During the reaction, add simulated gas as needed to keep the pressure in the reaction vessel between 1 MPa and 3 MPa. After the reaction has lasted for 4 hours, stop heating. Step 8. Analyze the content of simulated carbon dioxide gas at the inlet and outlet of the reaction vessel to evaluate the reaction effect; Hydroxyethylethylenediamine has a purity ≥99.5%; monoethanolamine has a purity ≥99.5%; diethanolamine has a purity ≥99.5%; diisopropanolamine has a purity ≥99.5%; triethylamine has a purity ≥99.5%. Hydroxyethyl ethylenediamine and monoethanolamine are mixed in a 5:1 ratio to prepare the mixture, and diethanolamine, diisopropanolamine and triethylamine are mixed in a 1:1:1 ratio to prepare the mixture. The solvent is composed of 2-amino-2-methyl-1-propanol and N-methyldiethanol. The 2-amino-2-methyl-1-propanol was prepared by mixing amine and diisopropanolamine in a 1:1:1 ratio; the purity of the 2-amino-2-methyl-1-propanol was ≥99.7%; the purity of the N-methyldiethanolamine was ≥99.7%; and the purity of the diisopropanolamine was ≥99.7%. In step 3, the reaction vessel is heated to 45°C under sealed conditions.

2. The method of claim 1, wherein, In step 6, the simulated gas pressure in the reaction vessel is stabilized at 3 MPa.

Images