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A kind of gas hydrate formation accelerator and preparation method thereof

A technology for hydrate formation and accelerators, applied in carbon compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of insufficient promotion efficiency, low recycling rate, environmental damage, etc., to shorten the overall time and improve synthesis Efficiency, corrosion reduction effect

Active Publication Date: 2016-04-13
溧阳常大技术转移中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But generally speaking, the promotion efficiency of these accelerators for hydrate formation is still not high enough, and they are easy to cause different degrees of damage to the environment, low reuse rate, high cost, and poor economy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Based on a total amount of 500g, use an electronic balance to weigh nano-graphite powder, sodium dodecylbenzenesulfonate and distilled water with a particle size of about 50nm at a ratio of 0.05%, 0.02%, and 99.3%, and add nano-graphite particles to the In the aqueous solution, use a magnetic stirrer to mechanically stir at a speed of 400rpm, and the stirring time lasts for 18min. After adding the surface dispersant SDBS, the stirred solution is stirred again with a magnetic stirrer at a speed of 600rpm, and the stirring time lasts for 25min. The liquid was ultrasonically dispersed for 15 minutes, and the dispersed liquid was mechanically stirred again at a speed of 800 rpm for 35 minutes. The prepared nanofluid package is ready for use.

[0015] This implementation case is carried out in a reactor with a volume of 500mL. The gas selected in the laboratory is carbon dioxide. The prepared nanofluid 250mL is added to the reactor through the liquid inlet system, and the te...

Embodiment 2

[0017] Based on the total amount of 500g, use an electronic balance to weigh nano-graphite powder, sodium dodecylbenzenesulfonate and distilled water with a particle size of about 50nm at a ratio of 1.5%, 0.08%, and 98.42%, respectively, and add the nano-graphite particles to the In the aqueous solution, use a magnetic stirrer to mechanically stir at a speed of 500rpm, and the stirring time lasts for 18 minutes. After adding the surface dispersant SDBS, the stirred solution is stirred again with a magnetic stirrer at a speed of 700rpm, and the stirring time lasts for 25 minutes. The liquid was ultrasonically dispersed for 20 minutes, and the dispersed liquid was mechanically stirred again at a speed of 800 rpm for 30 minutes. The prepared nanofluid package is ready for use.

[0018] This implementation case is carried out in a reactor with a volume of 500mL. The gas selected in the laboratory is carbon dioxide. 250mL of the prepared nanofluid is added to the reactor through th...

Embodiment 3

[0020] The preparation of the nanofluid is basically the same as in Example 1, except that the mass fraction of the nano-graphite powder is 1.5%, the mass fraction of sodium dodecylbenzenesulfonate is 0.02%, and water is the balance.

[0021] This implementation case is carried out in a reactor with a volume of 500mL. The gas selected in the laboratory is carbon dioxide. Add 250mL of nanofluid with a fraction of 0.02% into the reaction kettle, and control the temperature of the water bath at 6°C through the water circulation refrigeration system, and enter the air through the air intake system until the pressure in the kettle reaches 4MPa, and generate at constant volume at a speed of 350rpm Hydrate, hydrate crystal nuclei were observed after 140s.

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Abstract

The invention belongs to the field of gas hydrate production and utilization and in particular relates to an accelerant capable of reinforcing gas hydrate generation and a preparation method thereof. The hydrate generation accelerant is a mixed water solution formed by compounding nano dispersed particles with a surfactant and dissolving the compound in water, wherein nano graphite powder is adopted as the nano dispersed particles; SDBS (sodium dodecylbenzenesulfonate) is adopted as the surfactant; based on the total amount of the mixed water solution, the mass fraction of the nano graphite powder is 0.05-1.5%, the mass fraction of SDBS is 0.02-0.08% and the balance is water. The accelerant has the obvious advantages that the mass and heat transfer processes of the hydrate can be greatly reinforced, the overall time of hydrate generation can be shortened and the synthetic efficiency of the hydrate can be improved by adopting the accelerant to reinforce the hydrate generation process; the graphite nano-particles can flow out along with liquid water and can be reused, thus saving the cost.

Description

technical field [0001] The invention belongs to the field of gas hydrate production and utilization, in particular to an accelerator capable of enhancing the formation of gas hydrate and a preparation method thereof. Background technique [0002] Hydrate formation is a process accompanied by material transfer and energy change, and is essentially a process controlled by heat transfer and mass transfer. Therefore, the enhanced hydrate formation process is mainly carried out from the above two aspects. Traditional mechanical strengthening methods such as stirring, spraying, and bubbling are mainly used to enhance the gas-liquid mass transfer process and reduce the resistance to hydrate formation. also. The main purpose of various additives, including thermodynamic accelerators and kinetic accelerators, is also to enhance the heat and mass transfer at the gas-liquid interface. Nanofluid is a cooling medium with high thermal conductivity and heat transfer proposed at the end o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/20C01B32/50
Inventor 周诗岽余益松王树立赵苗苗赵书华饶永超
Owner 溧阳常大技术转移中心有限公司
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