CN-121971971-A - Multi-element composite hydrate accelerator for carbon sequestration

CN121971971ACN 121971971 ACN121971971 ACN 121971971ACN-121971971-A

Abstract

The application relates to a multi-component composite hydrate accelerant for carbon sequestration, which comprises an organic solvent Tetrahydrofuran (THF), a kinetic accelerant Sodium Dodecyl Sulfate (SDS) and a thermodynamic accelerant tetrabutylammonium bromide (TBAB), wherein the mass percentage concentration of the THF (5-50wt%) +SDS (0.001-1wt%) +TBAB (5-50wt%) after the THF, the kinetic accelerant Sodium Dodecyl Sulfate (SDS) and the thermodynamic accelerant tetrabutylammonium bromide (TBAB) are mixed with water. According to the application, THF, SDS, TBAB is combined according to the proportion to form the multi-element composite hydrate promoter, the synergistic effect of the three components obviously quickens the generation speed of the hydrate, the generation speed of the hydrate is improved, the generation time is shortened under the action of the multi-element thermodynamic promoter, and the sealing efficiency of the carbon dioxide is effectively improved.

Inventors

XU YUBING
HAN HONGXIA
CAO YUMING
ZHANG HANSONG
YAO SHUN
WANG CHEN
ZHANG JINTAO

Assignees

新疆准东经济技术开发区敦华绿碳技术有限公司

Dates

Publication Date: 20260505
Application Date: 20251231

Claims (10)

1. A multi-component composite hydrate accelerant for carbon sequestration is characterized by comprising an organic solvent Tetrahydrofuran (THF), a kinetic accelerant Sodium Dodecyl Sulfate (SDS) and a thermodynamic accelerant tetrabutylammonium bromide (TBAB), wherein the mass percentage concentration of the THF (5-50wt%) +SDS (0.001-1wt%) +TBAB (5-50wt%) after the three are mixed with water.
2. A multi-component composite hydrate promoter for carbon sequestration according to claim 1, wherein THF (tetrahydrofuran), SDS (sodium dodecyl sulfate) and TBAB (tetrabutylammonium bromide) are mixed according to the mass percentage concentration of 5wt%, 0.001 wt% and 5wt%, respectively, to prepare the composite promoter.
3. A multi-component composite hydrate promoter for carbon sequestration according to claim 1, wherein THF (tetrahydrofuran), SDS (sodium dodecyl sulfate) and TBAB (tetrabutylammonium bromide) are mixed according to the mass percentage concentration of 25wt%, 0.5 wt% and 25wt%, respectively, to prepare the composite promoter.
4. A multi-component composite hydrate promoter for carbon sequestration according to claim 1, wherein THF (tetrahydrofuran), SDS (sodium dodecyl sulfate) and TBAB (tetrabutylammonium bromide) are mixed according to the mass percentage concentration of 50wt%, 1 wt% and 50wt%, respectively, to prepare the composite promoter.
5. An experimental device for determining the multi-element composite hydrate promoter according to any one of claims 1-4, which is characterized by comprising a constant temperature device with a cavity inside, wherein a high-pressure reaction kettle for hydration reaction is arranged in the constant temperature device, an observation window is arranged on the surface of the high-pressure reaction kettle, the cavity inside the high-pressure reaction kettle is communicated with the lower part of a buffer tank arranged on the upper side of the high-pressure reaction kettle, a piston is arranged in the buffer tank, the cavity above the piston is connected with a hand pump through a pressurizing pipeline, the cavity below the piston is communicated with the cavity inside the high-pressure reaction kettle, the cavity below the piston is connected with a gas storage bottle and a vacuum pump which are connected in parallel through a gas inlet pipeline, the upper part of the cavity inside the high-pressure reaction kettle is communicated with a gas outlet pipeline, a magnetic stirrer is arranged at the bottom of the high-pressure reaction kettle, and the stirring end of the magnetic stirrer stretches into the cavity inside the high-pressure reaction kettle.
6. The experimental device for determining the multi-element composite hydrate promoter according to claim 5, wherein a first pressure sensor is arranged at a pressurizing cavity of the hand pump, a second pressure sensor and a temperature sensor are arranged in the constant temperature device, and the first pressure sensor, the second pressure sensor and the temperature sensor are connected with a data record display device circuit arranged outside the constant temperature device.
7. An application of a multi-element composite hydrate accelerant for carbon sequestration, comprising the following steps: s1, injecting the composite accelerator and the experimental solution into the high-pressure reaction kettle from a liquid inlet and outlet pipeline, then closing a control valve at the gas storage bottle, a control valve at the liquid inlet and outlet pipeline and a control valve on an exhaust pipeline, and then starting a vacuum pump to pump out gas in the high-pressure reaction kettle and each pipeline, wherein the vacuumizing time is 30 min; S2, controlling the temperature of a constant temperature device, keeping the temperature in the high-pressure reaction kettle stable, then opening a control valve at a gas storage bottle, closing a control valve at a vacuum pump, introducing CO 2 gas into the high-pressure reaction kettle, pressurizing the high-pressure reaction kettle by using a hand pump, stopping air inlet after the set pressure is reached, starting a magnetic stirrer below the high-pressure reaction kettle when the temperature in the high-pressure reaction kettle is reduced to the set temperature, starting timing, and generating a CO 2 hydrate, wherein the required time is the induction time of the CO 2 hydrate when a visible CO 2 hydrate crystal nucleus appears in an observation window; S3, after the temperature and pressure in the high-pressure reaction kettle are kept unchanged, the CO 2 hydrate can be considered to be completely generated, a control valve on an exhaust pipe is opened, the exhaust speed is controlled, the temperature in the high-pressure reaction kettle is kept constant, temperature and pressure data are transmitted to a data recording and displaying device through a temperature sensor, a first pressure sensor and a second pressure sensor, the temperature and pressure values of the CO 2 hydrate in the decomposition process are recorded, and an equilibrium point of the CO 2 sealed by a hydrate method is found through an observation window; And S4, after the exhaust valve is opened, the hydrate starts to decompose, and when obvious bright spots appear in the observation window, phase balance data at the moment, namely the balance point of the hydrate method for sealing up the CO 2 , are recorded.
8. The method of claim 7, wherein in step S2, the pressure is increased by pushing a hand pump to slowly increase the pressure in the autoclave, corresponding pressure values under different scales are recorded in the process, each time the pressure is increased by one time each time of min, the pressure value is 5% of the predicted value A, and if the hydrate is not continuously generated, the pressure in the autoclave is continuously increased by pushing the hand pump.
9. The method of claim 8, wherein in step S2, hydrate is formed by stopping the pump immediately when the pressure begins to drop significantly or the temperature increases significantly if hydrate is formed; if a large amount of hydrate is observed to be generated, the pressure in the high-pressure reaction kettle is immediately reduced by a hand pump until trace hydrate remains at the interface and the pressure is maintained unchanged; the pressure when a small amount of hydrate phenomenon is observed is C, and if A is less than or equal to C, the hand pump is regulated to enable the pressure to reach the predicted value A; If C < A, the hand pump is adjusted so that the pressure drops to 96% of C and the pressure at this point is set to D.
10. The method of claim 9, wherein the pressure is E after waiting 1 hour if it is stable for 20 minutes or more, and E is hydrate formation pressure if E=D; If the pressure is still changing after 1 hour, waiting until the pressure is not changed and can be kept stable for more than 20 minutes, and then enabling the stable pressure to be E, if E > D and the hydrate completely disappear, and E is equivalent to the scale pressure corresponding to the push pump when the hydrate is not generated, indicating that the hydrate is completely decomposed, D and E are smaller than the hydrate generation pressure, redefining A=min { E+0.06 MPa,1.05E }, and re-experiment; if E > D, but the hydrate is still present, continuing the observation; if D > E and D-E > min {0.05E,0.05 MPa }, redefining A=E, and restarting the experiment after the hydrate is completely dissolved; And when 0< D-E < min {0.05E,0.05 MPa }, continuing to observe; After waiting three hours, if the hydrate completely disappears and the final pressure indication is equivalent to the scale pressure corresponding to the pushing pump when no hydrate is generated, the hydrate is completely decomposed, the pressure indication is defined as F at the moment, A=min { F+0.03 MPa, 1.025F } is redefined, and the experiment is repeated; at this point, if a small amount of hydrate is still present, the pressure F is the hydrate formation pressure under this condition.

Description

Multi-element composite hydrate accelerator for carbon sequestration Technical Field The application relates to a hydrate accelerator, in particular to a multi-element composite hydrate accelerator for carbon sequestration. Background In recent years, the "greenhouse effect" has become a social hotspot problem, and is also a global environmental problem, and CO 2 is one of the main gases causing the greenhouse effect. The fire coal can generate a large amount of CO 2, and if the fire coal is directly discharged, the fire coal can pollute the environment, so that the fire coal needs to be sealed and stored. The technology for blocking CO 2 by a hydrate method is characterized in that CO 2 is captured and blocked by forming stable gas hydrate, and the promotion effect of a single surfactant on the growth of the hydrate is limited, and the following defects are particularly shown: 1. The thermodynamic condition is harsh, and the method mainly shows that the production pressure of the hydrate is higher under the condition of no thermodynamic promoter, so that the experimental cost is high and the industrialized energy consumption is high; 2. Hydrate stability problem although studies have shown a high degree of stability after CO 2 forms a hydrate, its long-term stability needs to be further verified. Particularly, in practical application of the hydrate method for sealing CO 2, the stability of the CO 2 hydrate can be ensured for a long time, and decomposition or leakage is avoided; 3. the slow gas-liquid diffusion mass transfer process can influence the generation kinetics of CO 2 hydrate in the sealing process. For the above reasons, there is a need for a multi-component composite hydrate promoter for carbon sequestration that can solve the above-described limitations of single surfactants on the promotion of hydrate growth. Disclosure of Invention The application aims to provide a multi-element composite hydrate accelerator for carbon sequestration, which is capable of reducing the pressure required by hydration reaction and improving the hydration reaction rate and the hydrate stability, and the application of the multi-element composite hydrate accelerator is provided on the basis of the former aim. The multi-element composite hydrate accelerant for carbon sequestration comprises an organic solvent Tetrahydrofuran (THF), a kinetic accelerant Sodium Dodecyl Sulfate (SDS) and a thermodynamic accelerant tetrabutylammonium bromide (TBAB), wherein the mass percentage concentration of the THF (5-50wt%) +SDS (0.001-1wt%) +TBAB (5-50wt%) after the three are mixed with water, namely, 5-50g of THF,0.001-1g of SDS and 5-50g of TBAB are dissolved in 100g of water. Further, THF (tetrahydrofuran), SDS (sodium dodecyl sulfate) and TBAB (tetrabutylammonium bromide) were mixed at a concentration of 5wt%, 0.001 wt wt% and 5wt%, respectively, to prepare a composite accelerator. Compared with the control group (4 MPa, >5 h), the hydrate generation time is faster, and the generation pressure is lower (1.77 MPa,242 min). Further, THF (tetrahydrofuran), SDS (sodium dodecyl sulfate) and TBAB (tetrabutylammonium bromide) were mixed at a concentration of 25wt%, 0.5wt% and 25wt%, respectively, by mass, to prepare a composite accelerator. Compared with the control group (4 MPa, >5 h), the generation time of the hydrate is faster, and the generation pressure is lower (1.36 MPa,117 min). Further, THF (tetrahydrofuran), SDS (sodium dodecyl sulfate) and TBAB (tetrabutylammonium bromide) were mixed at a concentration of 50wt%, 1 wt% and 50wt% respectively by mass% to prepare a composite accelerator. Compared with the control group (4 MPa, >5 h), the generation time of the hydrate is faster, and the generation pressure is lower (0.91 MPa,12 min). An experimental device for determining a multielement compound hydrate accelerator comprises a constant temperature device with a cavity inside, wherein a high-pressure reaction kettle for hydration reaction is arranged in the constant temperature device, an observation window is arranged on the surface of the high-pressure reaction kettle, the cavity inside the high-pressure reaction kettle is communicated with the lower part of a buffer tank arranged on the upper side of the high-pressure reaction kettle, a piston is arranged in the buffer tank, the cavity above the piston is connected with a hand pump through a pressurizing pipeline, the cavity below the piston is communicated with the cavity inside the high-pressure reaction kettle, the cavity below the piston is connected with a parallelly connected gas storage bottle and a vacuum pump through a gas inlet pipeline, the upper part of the cavity inside the high-pressure reaction kettle is communicated with a gas outlet pipeline, the lower part of the cavity inside the high-pressure reaction kettle is communicated with a liquid inlet pipeline and outlet pipeline, a magnetic stirrer is arranged at the bottom of the high-pressure reaction kettle,