Ionic type composite hydrate accelerant for carbon sequestration

Abstract

The invention relates to an ionic composite hydrate accelerant for carbon sequestration, which comprises amino acid salt: sodium glycinate NaGly, a surfactant: octyl glucoside OGP, a thermodynamic accelerant: tetrabutylammonium bromide TBAB and a dynamic accelerant: lauryl sodium sulfate SDS, and after the four components are mixed with water, the mass percent concentration of NaGly (0.001-1wt%) + OGP (0.001-1wt%) + SDS (0.001-1wt%) + TBAB (5-50wt%) is obtained. NaGly, OGP, TBAB and SDS are combined according to the proportion to form the ionic composite hydrate accelerant, the generation speed of hydrate is remarkably increased through cooperation of the four components, the generation time is shortened, and the sealing efficiency of carbon dioxide is effectively improved.

Description

Technical Field

[0001] This application relates to a hydrate promoter, and more particularly to an ionic composite hydrate promoter for carbon sequestration. Background Technology

[0002] In recent years, the "greenhouse effect" has become a hot social issue and a global environmental problem. CO2 is one of the main gases that cause the greenhouse effect. Combustion of coal produces a large amount of CO2, and if it is released directly, it will pollute the environment. Therefore, it needs to be stored.

[0003] The core of CO2 sequestration technology using hydrates is to capture and store CO2 by forming stable gaseous hydrates. However, the effect of a single surfactant on promoting hydrate growth is relatively limited, specifically due to the following drawbacks: 1. Harsh thermodynamic conditions: This is mainly reflected in the high pressure required for hydrate production without thermodynamic promoters, resulting in high experimental costs and high energy consumption for industrialization. 2. Hydrate Stability: Although studies have shown that CO2 exhibits high stability after forming hydrates, its long-term stability still requires further verification. Especially in practical applications of CO2 sequestration using hydrates, it is necessary to ensure the stability of CO2 hydrates over extended periods to prevent decomposition or leakage. 3. The problem of slow conversion rate in the kinetic process: The slow gas-liquid diffusion mass transfer process will affect the kinetics of CO2 hydrate formation during the storage process.

[0004] For the reasons mentioned above, it is necessary to study an ionic composite hydrate promoter for carbon sequestration that can overcome the limitations of the promoting effect of single surfactants on hydrate growth. Summary of the Invention

[0005] The purpose of this application is to provide an ionic composite hydrate promoter for carbon sequestration that reduces the pressure required for the hydration reaction and improves the hydration reaction rate and hydrate stability; based on the former purpose, another purpose of this application is to propose the application of the ionic composite hydrate promoter.

[0006] This application is implemented as follows: an ionic composite hydrate promoter for carbon sequestration, comprising an amino acid salt: sodium glycine (NaGly), a surfactant: octyl glucoside (OGP), a thermodynamic promoter: tetrabutylammonium bromide (TBAB), and a kinetic promoter: sodium dodecyl sulfate (SDS). The mass percentage concentration of the four components after mixing with water is NaGly (0.001~1wt%) + OGP (0.001~1wt%) + SDS (0.001~1wt%) + TBAB (5~50wt%).

[0007] Furthermore, an ionic composite hydrate promoter was prepared by mixing sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutylammonium bromide (TBAB), and sodium dodecyl sulfate (SDS) at mass percentage concentrations of 0.001 wt%, 0.001 wt%, 0.001 wt%, and 5 wt%, respectively. Compared to the control group (4 MPa, >5 h), the hydrate formation time was faster and the formation pressure was lower (1.32 MPa, 229 min).

[0008] Furthermore, an ionic composite hydrate promoter was prepared by mixing sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutylammonium bromide (TBAB), and sodium dodecyl sulfate (SDS) at mass percentage concentrations of 0.5 wt%, 0.5 wt%, 0.5 wt%, and 25 wt%, respectively. Compared to the control group (4 MPa, >5 h), the hydrate formation time was faster and the formation pressure was lower (1.04 MPa, 93 min).

[0009] Furthermore, an ionic composite hydrate promoter was prepared by mixing sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutylammonium bromide (TBAB), and sodium dodecyl sulfate (SDS) at mass percentage concentrations of 1 wt%, 1 wt%, 1 wt%, and 50 wt%, respectively. Compared to the control group (4 MPa, >5 h), the hydrate formation time was faster and the formation pressure was lower (0.62 MPa, 8 min).

[0010] An experimental apparatus for determining ionic complex hydrate promoters includes a constant temperature device with an internal cavity, a high-pressure reactor for hydration reaction is installed inside the constant temperature device, an observation window is provided on the surface of the high-pressure reactor, the internal cavity of the high-pressure reactor is connected to the lower part of a buffer tank located on the upper side of the high-pressure reactor, a piston is installed in the buffer tank, the cavity above the piston is connected to a hand-cranked pump through a pressurization pipeline, the cavity below the piston is connected to the internal cavity of the high-pressure reactor, the cavity below the piston is connected to a parallel gas storage bottle and a vacuum pump through an air inlet pipeline, the upper part of the internal cavity of the high-pressure reactor is connected to an exhaust pipeline, and the lower part of the internal cavity of the high-pressure reactor is connected to inlet and outlet liquid pipelines; a magnetic stirrer is installed at the bottom of the high-pressure reactor, and the stirring end of the magnetic stirrer extends into the internal cavity of the high-pressure reactor.

[0011] The application of an ionic composite hydrate promoter for carbon sequestration includes the following steps: S1. Inject the ionic composite hydrate promoter and experimental solution described in this application into the high-pressure reactor through the inlet and outlet liquid pipelines. Then close the control valve at the gas storage bottle, the control valve at the inlet and outlet liquid pipelines, and the control valve on the exhaust pipeline. Then turn on the vacuum pump to remove the gas from the high-pressure reactor and each pipeline. The vacuuming time is 30 minutes. S2. Control the temperature of the thermostat to maintain a stable temperature inside the high-pressure reactor. Then, open the control valve at the gas storage bottle and close the control valve at the vacuum pump to introduce CO2 gas into the high-pressure reactor. Use a hand pump to pressurize the high-pressure reactor until the set pressure is reached, then stop the gas intake. When the temperature inside the high-pressure reactor drops to the set temperature, turn on the magnetic stirrer at the bottom of the high-pressure reactor and start timing. As CO2 hydrates are formed, the time required for visible CO2 hydrate crystal nuclei to appear in the observation window is the induction time of CO2 hydrates. S3. Once the temperature and pressure in the high-pressure reactor remain constant, it can be considered that CO2 hydrate has been completely generated. Open the control valve on the exhaust pipe and control the exhaust speed (pressure drops by 0.01 MPa every 5-7 seconds) to maintain a constant temperature inside the high-pressure reactor. Transmit the temperature and pressure data to the data recording and display device through the temperature sensor, the first pressure sensor, and the second pressure sensor to record the temperature and pressure values ​​of CO2 hydrate during the decomposition process. Find the equilibrium point for CO2 hydrate sequestration by observing the observation window. S4. After opening the exhaust valve, the hydrate begins to decompose. When a bright spot appears in the observation window, record the phase equilibrium data at this time, which is the equilibrium point of CO2 sequestration by the hydrate method.

[0012] Furthermore, in step S2, the temperature inside the high-pressure reactor is 2℃~10℃, the specific pressure is 3~5 MPa, and the magnetic stirrer inside the high-pressure reactor rotates at 500 rpm.

[0013] Due to the implementation of the above technical solution, this application uses an ionic composite hydrate promoter consisting of NaGly (0.001~1wt%) + OGP (0.001-1wt%) + TBAB (5-50wt%) + SDS (0.001-1wt%). NaGly is an amino acid salt that can increase the reaction rate of the hydration reaction. OGP, as a kinetic promoter for hydrate formation, promotes hydrate formation by changing the properties of the liquid, thereby increasing the hydrate formation rate. TBAB, as an additive, further accelerates the hydrate formation process by adjusting the properties of the reaction medium, changing the physicochemical properties of the reaction system, and improving the speed and efficiency of hydrate formation. SDS lowers the interfacial energy for hydrate formation, making it easier for carbon dioxide to be encapsulated by water molecules to form hydrates. Beneficial effects: The synergistic effect of the four components significantly accelerates the hydrate formation rate and improves the efficiency of carbon dioxide sequestration. Under the action of the above-mentioned ionic composite hydrate promoter, the hydrate formation rate is increased, the formation time is shortened, and the carbon dioxide sequestration efficiency is effectively improved. Attached Figure Description

[0014] The specific structure of this application is given by the following figures and embodiments: Figure 1 This is a schematic diagram of the experimental apparatus of this application.

[0015] Legend: 1. Gas storage cylinder, 2. Vacuum pump, 3. Inlet pipe, 4. Piston, 5. Buffer tank, 6. Thermostat, 7. Exhaust pipe, 8. First pressure sensor, 9. Hand pump, 10. Pressurization pipe, 11. Inlet and outlet pipes, 12. High-pressure reactor, 13. Magnetic stirrer, 14. Observation window, 15. Temperature sensor, 16. Second pressure sensor. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0018] Example: An ionic composite hydrate promoter for carbon sequestration, comprising an amino acid salt: sodium glycine (NaGly), a surfactant: octyl glucoside (OGP), a thermodynamic promoter: tetrabutylammonium bromide (TBAB), and a kinetic promoter: sodium dodecyl sulfate (SDS). The mass percentage concentration of the four components after mixing with water is NaGly (0.001~1wt%) + OGP (0.001~1wt%) + SDS (0.001~1wt%) + TBAB (5~50wt%).

[0019] Furthermore, an ionic composite hydrate promoter was prepared by mixing sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutylammonium bromide (TBAB), and sodium dodecyl sulfate (SDS) at mass percentage concentrations of 0.001 wt%, 0.001 wt%, 0.001 wt%, and 5 wt%, respectively. Compared to the control group (4 MPa, >5 h), the hydrate formation time was faster and the formation pressure was lower (1.32 MPa, 229 min).

[0020] Furthermore, an ionic composite hydrate promoter was prepared by mixing sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutylammonium bromide (TBAB), and sodium dodecyl sulfate (SDS) at mass percentage concentrations of 0.5 wt%, 0.5 wt%, 0.5 wt%, and 25 wt%, respectively. Compared to the control group (4 MPa, >5 h), the hydrate formation time was faster and the formation pressure was lower (1.04 MPa, 93 min).

[0021] Furthermore, an ionic composite hydrate promoter was prepared by mixing sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutylammonium bromide (TBAB), and sodium dodecyl sulfate (SDS) at mass percentage concentrations of 1 wt%, 1 wt%, 1 wt%, and 50 wt%, respectively. Compared to the control group (4 MPa, >5 h), the hydrate formation time was faster and the formation pressure was lower (0.62 MPa, 8 min).

[0022] When the OGP mass percentage concentration is below 0.001 wt%, the kinetic promoting effect is insufficient; above 1 wt%, micelle formation may inhibit the reaction. When the NaGly mass percentage concentration is below 0.001 wt%, the kinetic promoting effect is insufficient; above 1 wt%, micelle formation (CMC) may inhibit the reaction. When the SDS mass percentage concentration is below 0.001 wt%, the kinetic promoting effect is insufficient; above 1 wt%, the amount of micelles formed by electrostatic binding will inhibit the thermodynamic promoting effect of TBAB. When the TBAB mass percentage concentration is above 50 wt%, the thermodynamic promoting effect saturates, and the cost increases. Therefore, this range can balance the promoting effect and economy.

[0023] like Figure 1 As shown, an experimental apparatus for determining ionic composite hydrate promoters includes a constant temperature device 6 with an internal cavity. A high-pressure reactor 12 for hydration reaction is installed inside the constant temperature device 6. An observation window 14 is provided on the surface of the high-pressure reactor 12. The internal cavity of the high-pressure reactor 12 is connected to the lower part of a buffer tank 5 located on the upper side of the high-pressure reactor 12. A piston 4 is installed inside the buffer tank 5. The cavity above the piston 4 is connected to a hand-cranked pump 9 through a pressurization pipe 10. The cavity below the piston 4 is connected to the internal cavity of the high-pressure reactor 12. The cavity below the piston 4 is connected to a parallel gas storage bottle 1 and a vacuum pump 2 through an air inlet pipe 3. The upper part of the internal cavity of the high-pressure reactor 12 is connected to an exhaust pipe 7. The lower part of the internal cavity of the high-pressure reactor 12 is connected to an inlet / outlet liquid pipe 11.

[0024] Furthermore, a magnetic stirrer 13 is provided at the bottom of the high-pressure reactor 12, with the stirring end of the magnetic stirrer 13 extending into the inner cavity of the high-pressure reactor 12. The magnetic stirrer 13 is used to uniformly mix the gas and liquid phases and enhance mass transfer within the reactor. Its speed is adjustable, which is existing technology and not the point of this invention. Therefore, its specific structure will not be described in detail.

[0025] Furthermore, the constant temperature device 6 is existing technology and is not the point of invention of this application. Its specific structure will not be described in detail. It is equipped with a second pressure sensor 16 and a temperature sensor 15. The second pressure sensor 16 and the temperature sensor 15 are connected to the data recording and display device circuit located outside the constant temperature device 6.

[0026] Furthermore, a first pressure sensor 8 is provided at the pressurization chamber of the hand pump 9, and the first pressure sensor 8 is connected to the data recording and display device circuit located outside the constant temperature device 6.

[0027] The data recording and display device is used to record pressure and temperature data transmitted through the first pressure sensor 8, the second pressure sensor 16 and the temperature sensor 15. This is also prior art and not the point of invention of this application. The specific structure is not described in detail.

[0028] Furthermore, control valves are installed on the air inlet pipe 3, the exhaust pipe 7, the liquid inlet / outlet pipe 11, and at the connection points between the air inlet pipe 3 and the gas storage cylinder 1 and the vacuum pump 2.

[0029] The application of an ionic composite hydrate promoter for carbon sequestration includes the following steps: S1. Inject the ionic composite hydrate promoter and experimental solution described in this application into the high-pressure reactor 12 through the inlet / outlet liquid pipeline 11. Then close the control valve at the gas storage bottle 1, the control valve at the inlet / outlet liquid pipeline 11, and the control valve on the exhaust pipeline 7. Then turn on the vacuum pump 2 to remove the gas from the high-pressure reactor 12 and each pipeline. The vacuuming time is 30 minutes. S2. Control the temperature of the thermostat 6 to maintain a stable temperature inside the high-pressure reactor 12. Then, open the control valve at the gas storage bottle 1 and close the control valve at the vacuum pump 2 to introduce CO2 gas into the high-pressure reactor 12. Use the hand pump 9 to pressurize the high-pressure reactor 12. Stop the gas intake after reaching the set pressure. When the temperature inside the high-pressure reactor 12 drops to the set temperature, turn on the magnetic stirrer 13 below the high-pressure reactor 12 and start timing. As CO2 hydrates are generated, the time required for visible CO2 hydrate crystal nuclei to appear in the observation window 14 is the induction time of CO2 hydrates. S3. Once the temperature and pressure in the high-pressure reactor 12 remain constant, it can be considered that CO2 hydrate has been completely generated. Open the control valve on the exhaust pipe 7 to control the exhaust speed (pressure drops by 0.01 MPa every 5-7 seconds) and keep the temperature inside the high-pressure reactor 12 constant. Transmit the temperature and pressure data to the data recording and display device through the temperature sensor 15, the first pressure sensor 8, and the second pressure sensor 16 to record the temperature and pressure values ​​of CO2 hydrate during the decomposition process. Find the equilibrium point for CO2 hydrate sequestration by observing the observation window 14. S4. After opening the exhaust valve, the hydrate begins to decompose. When a bright spot appears in observation window 14, record the phase equilibrium data at this time, which is the equilibrium point of CO2 sequestration by the hydrate method.

[0030] Furthermore, the experimental solution refers to a mixture of one or more of the following components: deionized water, NaCl, calcium chloride, sodium sulfate, etc., used to simulate [the process].

[0031] Furthermore, in step S2, the temperature inside the high-pressure reactor 12 is 2℃~10℃, the specific pressure is 3~5Mpa, and the magnetic stirrer 13 operates at a speed of 500 rpm.

[0032] Further, in step S1, the reactor is cleaned: the control valves at vacuum pump 2 and inlet pipe 3 are opened, the control valves at inlet / outlet liquid pipe 11 and exhaust pipe 7 are closed, vacuum pump 2 is started to evacuate the high-pressure reactor 12, and then the control valves at vacuum pump 2 and inlet pipe 3 are closed, and the control valves at inlet / outlet liquid pipe 11 are opened to draw in 80... Add ml of deionized water, turn on the magnetic stirrer 13 to clean the high-pressure reactor 12 3-4 times, and discharge the cleaned deionized water through the inlet / outlet pipe 11; then open the control valves at the vacuum pump 2 and the air inlet pipe 3 again, close the control valves at the inlet / outlet pipe 11, use the vacuum pump 2 to evacuate the high-pressure reactor 12, close the control valves at the vacuum pump 2 and the air inlet pipe 3, open the control valves at the inlet / outlet pipe 11 to draw in the ionic composite hydrate promoter described in this application and rinse 1-2 times, and discharge the rinsed ionic composite hydrate promoter through the inlet / outlet pipe 11; finally, inject a total of 50 ml of the ionic composite hydrate promoter and experimental solution described in this application into the high-pressure reactor 12 at a volume ratio of 1:25.

[0033] Further, in step S2, intake of gas: Feed the experimental gas (CO2) from the gas storage cylinder 1 into the high-pressure reactor 12, purge each pipeline 3-4 times, and after completely exhausting the residual air in the high-pressure reactor 12, preset the expected generation pressure value as A. Feed the experimental gas and stop intake when the pressure in the high-pressure reactor 12 reaches 70% of the predicted value A. Close the valve at the intake pipeline 3, turn on the magnetic stirrer 13, and adjust the rotation speed to 500 r / min.

[0034] Further, in step S2, start the reaction: Set the temperature in the constant temperature device 6 required for the experiment. After waiting for the temperature in the high-pressure reactor 12 to reach the target value and become constant, observe the formation of hydrate at the gas-liquid interface through the observation window 14 of the high-pressure reactor 12.

[0035] Further, in step S2, pressurization: Push the hand pump 9 to slowly increase the pressure in the high-pressure reactor 12. Record the corresponding pressure values at different scales during the process. Pressurize approximately once every 2 minutes, and each pressurization value is about 5% of the predicted value A (i.e., 5%A). If the hydrate does not continue to form, continuously increase the pressure in the high-pressure reactor 12 by pushing forward the hand pump 9.

[0036] Further, in step S2, hydrate formation: If the hydrate forms, the pressure indication will decrease significantly. Note that when the pressure starts to drop significantly or the temperature rises significantly, stop pushing the pump immediately. If a large amount of hydrate is observed to form, immediately reduce the pressure in the high-pressure reactor 12 through the hand pump 9 until there is a trace amount of hydrate remaining at the interface and maintain the pressure constant. Let the pressure when a small amount of hydrate phenomenon can be observed be C. At this time, if A ≤ C, adjust the hand pump 9 to make the pressure reach the predicted value A; if C < A, then adjust the hand pump 9 to make the pressure drop to 96% of C (if the pressure of 96%C has been proven not to form hydrate before, adjust to a relatively larger value), and let the pressure value at this time be D.

[0037] Wait for 1 hour. If the pressure is stable after 1 hour and remains stable for more than 20 minutes, let the pressure at this time be E. At this time, if E = D, then E is the hydrate formation pressure; if the pressure is still changing after 1 hour, wait until the pressure no longer changes and remains stable for more than 20 minutes, and then let the stable pressure at this time be E. If E > D and the hydrate completely disappears, and E is equivalent to the calibrated pressure corresponding to the pump when no hydrate is formed, it means that the hydrate is completely resolved. D and E are less than the hydrate formation pressure. Redefine A = min{E + 0.06 MPa, 1.05E}, and restart the experiment from the beginning of hydrate formation; if E > D, but the hydrate still exists, continue to observe and go to step 6; if D > E and D - E > min{0.05E, 0.05 MPa}, redefine A = E, and restart the experiment from the start of the reaction after the hydrate is completely resolved. When 0 < D - E < min{0.05E, 0.05 MPa}, continue to observe.

[0038] To verify the effect of the ionic composite hydrate promoter (TBAB > 0), the data under the conditions of no promoter and ionic composite hydrate promoter were compared. The experiment was repeated three times and the average value was taken. The results are shown in the following table: condition Generation pressure (MPa) Induction time (min) Hydrate stability (h) No accelerator 4.0 ＞300 24 0.001wt%NaGly+0.001wt%OGP+0.001wt%SDS+5wt%TBAB 1.32 229 36 0.5wt%NaGly+0.5wt%OGP+0.5wt%SDS+25wt%TBAB 1.04 93 40 1wt%NaGly+1wt%OGP+1wt%SDS+50wt%TBAB 0.62 8 65 The above shows the application effects of ionic composite hydrate promoters NaGly, OGP, SDS, and TBAB under different ratios. The experimental condition temperature was set at 5°C and the stirring speed was 500 r / min. The experimental data show that the ionic composite hydrate promoter can significantly reduce the CO2 hydrate formation pressure and shorten the induction time.

[0039] Furthermore, in step S2, to determine the hydrate formation pressure, after waiting for three hours, if the hydrate completely disappears and the final pressure reading is equivalent to the calibrated pressure corresponding to the pump when no hydrate is formed, it means that the hydrate is completely resolved. Define the pressure reading at this time as F, and redefine A = min{F + 0.03 MPa, 1.025F}, and restart the experiment from the start of the reaction; if there is still a small amount of hydrate at this time, then the pressure F is the hydrate formation pressure under this condition, and it is possible to try industrialized hydrate sequestration at this pressure.

[0040] The constant temperature device 6 in this application is a constant temperature air bath with a temperature range of 253.15 K to 323.15 K. A temperature sensor 15 (Pt100) is installed inside the high-pressure reactor 12 to measure the internal temperature of the reactor 12, with a measurement accuracy of ±0.1 K. The pressure value is measured in real time by the first pressure sensor 8 and the second pressure sensor 16, with a measurement range of 0 to 20 MPa and a measurement accuracy of ±0.01 MPa. In this experiment, the solution was prepared using an analytical balance CPA225D (weighing accuracy of 0.01 g). This application combines NaGly, OGP, TBAB, and SDS in the aforementioned ratio to form an ionic composite hydrate promoter. TBAB can significantly reduce the pressure required for CO2 to form hydrates. TBAB can participate in hydrate formation because it can occupy the hollow pores in the hydrate structure during the hydrate formation process, increasing the pore filling rate and promoting hydrate stability. OGP can increase the reaction rate of the hydration reaction. SDS lowers the interfacial energy for hydrate formation, making it easier for carbon dioxide to be encapsulated by water molecules to form hydrates. By reducing the interfacial energy, SDS significantly accelerates the interaction between carbon dioxide and water molecules and the formation of hydrates. NaGly is an amino acid salt that can increase the reaction rate of the hydration reaction. Therefore, this application can promote the formation of CO2 hydrates, solving the problems of high pressure and slow reaction rate in hydrate production, making the hydrate method for CO2 sequestration more industrially valuable.

[0041] The above technical features constitute the embodiments of this application, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. An ionic composite hydrate promoter for carbon sequestration, characterized in that: It includes an amino acid salt: sodium glycine (NaGly), a surfactant: octyl glucoside (OGP), a thermodynamic promoter: tetrabutylammonium bromide (TBAB), and a kinetic promoter: sodium dodecyl sulfate (SDS). The mass percentage concentration of the four components when mixed with water is: NaGly: 0.001~1 wt% + OGP: 0.001~1 wt% + SDS: 0.001~1 wt% + TBAB: 5~50 wt%.

2. The ionic composite hydrate promoter for carbon sequestration as described in claim 1, characterized in that: An ionic composite hydrate promoter was prepared by mixing sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutylammonium bromide (TBAB), and sodium dodecyl sulfate (SDS) at mass percentage concentrations of 0.001 wt%, 0.001 wt%, 0.001 wt%, and 5 wt%, respectively.

3. An ionic composite hydrate promoter for carbon sequestration as described in claim 1, characterized in that: An ionic composite hydrate promoter was prepared by mixing sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutylammonium bromide (TBAB), and sodium dodecyl sulfate (SDS) at mass percentage concentrations of 0.5 wt%, 0.5 wt%, 0.5 wt%, and 25 wt%, respectively.

4. An ionic composite hydrate promoter for carbon sequestration as described in claim 1, characterized in that: An ionic composite hydrate promoter was prepared by mixing sodium glycinate (NaGly), octyl glucoside (OGP), tetrabutylammonium bromide (TBAB), and sodium dodecyl sulfate (SDS) at mass percentage concentrations of 1 wt%, 1 wt%, 1 wt%, and 50 wt%, respectively.

5. An experimental apparatus for determining the ionic complex hydrate promoter as described in any one of claims 1-4, characterized in that: The apparatus includes a temperature control device with an internal cavity, within which a high-pressure reactor for hydration reaction is installed. The surface of the high-pressure reactor has an observation window. The internal cavity of the high-pressure reactor is connected to the lower part of a buffer tank located above the high-pressure reactor. A piston is installed inside the buffer tank. The cavity above the piston is connected to a hand-cranked pump via a pressurization pipeline, and the cavity below the piston is connected to the internal cavity of the high-pressure reactor. The cavity below the piston is connected to a parallel gas storage cylinder and a vacuum pump via an inlet pipeline. The upper part of the internal cavity of the high-pressure reactor is connected to an exhaust pipeline, and the lower part of the internal cavity of the high-pressure reactor is connected to inlet and outlet liquid pipelines. A magnetic stirrer is installed at the bottom of the high-pressure reactor, with its stirring end extending into the internal cavity of the high-pressure reactor.

6. The experimental apparatus for determining ionic complex hydrate promoters as described in claim 5, characterized in that: A first pressure sensor is installed in the pressurization chamber of the hand pump, and a second pressure sensor and a temperature sensor are installed inside the constant temperature device. The first pressure sensor, the second pressure sensor, and the temperature sensor are connected to the data recording and display device circuit located outside the constant temperature device.

7. The application of an ionic composite hydrate promoter for carbon sequestration includes the following steps: S1. Inject the ionic composite hydrate promoter and experimental solution into the high-pressure reactor through the inlet and outlet liquid pipelines. Then close the control valves at the gas storage bottle, the inlet and outlet liquid pipelines, and the exhaust pipeline. Then turn on the vacuum pump to remove the gas from the high-pressure reactor and each pipeline. The vacuuming time is 30 minutes. S2. Control the temperature of the constant temperature device to keep the temperature inside the high-pressure reactor stable. Then, open the control valve at the gas storage cylinder and close the control valve at the vacuum pump, and introduce CO2 gas into the high-pressure reactor. Use a hand pump to pressurize the high-pressure reactor. Stop the gas intake after reaching the set pressure. When the temperature inside the high-pressure reactor drops to the set temperature, turn on the magnetic stirrer below the high-pressure reactor and start timing. As CO2 hydrate forms, when visible CO2 hydrate nuclei appear in the observation window, the time required is the induction time of CO2 hydrate; S3. After the temperature and pressure in the high-pressure reactor remain unchanged, it can be considered that the CO2 hydrate is completely formed. Open the control valve on the exhaust pipeline, control the exhaust speed, and keep the temperature inside the high-pressure reactor constant. Transmit the temperature and pressure data to the data recording and display device through the temperature sensor, the first pressure sensor, and the second pressure sensor. Record the temperature and pressure values during the decomposition process of CO2 hydrate, and find the equilibrium point of CO2 sequestration by the hydrate method by observing the observation window; S4. After opening the exhaust valve, the hydrate begins to decompose. When obvious bright spots appear in the observation window, record the phase equilibrium data at this time, that is, the equilibrium point of CO2 sequestration by the hydrate method.

8. The application of the ionic composite hydrate promoter for carbon sequestration as described in claim 7, characterized in that: In step S2, pressurization: Push the hand pump to slowly increase the pressure inside the high-pressure reactor. During the process, record the corresponding pressure values at different scales. Pressurize every 2 minutes, and each pressurization value is 5% of the estimated value A. If the hydrate does not continue to form, continuously increase the pressure inside the high-pressure reactor by pushing the hand pump forward.

9. The application of the ionic composite hydrate promoter for carbon sequestration as described in claim 8, characterized in that: In step S2, hydrate formation: If the hydrate forms, the pressure indication will decrease significantly. When the pressure begins to decrease significantly or the temperature rises significantly, stop pushing the pump immediately; If a large amount of hydrate is observed to form, immediately reduce the pressure inside the high-pressure reactor through the hand pump until there is a trace amount of hydrate remaining at the interface and maintain the pressure unchanged; Let the pressure when a small amount of hydrate phenomenon can be observed be C. At this time, if A ≤ C, adjust the hand pump to make the pressure reach the predicted value A; If C < A, then adjust the hand pump to make the pressure drop to 96% of C, and let the pressure value at this time be D.

10. The application of the ionic composite hydrate promoter for carbon sequestration as described in claim 9, characterized in that: Wait for 1 hour. If the pressure is stable and stable for more than 20 minutes after 1 hour, let the pressure at this time be E. At this time, if E = D, then E is the hydrate formation pressure; If the pressure is still changing after 1 hour, wait until the pressure stops changing and remains stable for more than 20 minutes, and then let the stable pressure at this time be E. If E > D and the hydrate completely disappears, and E is equivalent to the scale pressure corresponding to pushing the pump when no hydrate is formed, it means that the hydrate is completely decomposed. D and E are less than the hydrate formation pressure. Redefine A = min{E + 0.06 MPa, 1.05E}, and conduct the experiment again; If E > D, but the hydrate still exists, continue to observe; If D > E and D - E > min{0.05E, 0.05 MPa}, then redefine A = E, and start the experiment again after the hydrate is completely decomposed; When 0 < D - E < min{0.05E, 0.05 MPa}, continue to observe; After waiting for three hours, if the hydrate completely disappears and the final pressure reading is equivalent to the calibrated pressure corresponding to the pump operation when no hydrate was formed, it indicates that the hydrate has completely decomposed. Define the pressure reading at this time as F, and re-define A = min{F + 0.03 MPa, 1.025F}, and conduct the experiment again; If there is still a small amount of hydrate at this time, then the pressure F is the hydrate formation pressure under this condition.

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