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Gas hydrate accelerant and application thereof in saline-water desalting and carbon dioxide capturing

A gas hydrate and carbon dioxide technology, which is applied in specific gas purification/separation, gas treatment, carbon compounds, etc., can solve the problems of insufficient gas storage and low kinetics, and achieve improved stability, wide sources, and convenient industrial operation. Effect

Active Publication Date: 2017-08-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The primary purpose of the present invention is to provide a gas hydrate accelerator to solve the problems of low kinetics and insufficient gas storage capacity during the use of gas hydrate technology

Method used

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  • Gas hydrate accelerant and application thereof in saline-water desalting and carbon dioxide capturing
  • Gas hydrate accelerant and application thereof in saline-water desalting and carbon dioxide capturing

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0029] In this embodiment, an aqueous solution with a mass fraction of 0.5% methionine and 2% THF is used as a hydration accelerator, and the salt content is 2.0%.

[0030] The application of hydrate accelerator in brine desalination and carbon dioxide capture specifically includes the following steps:

[0031] 1) Uniformly mix 0.5g methionine, 2g THF and 97.5g brine (2g NaCl, 95.5g water) to obtain a mixed solution;

[0032] 2) Add 100g of the above mixed solution to the autoclave (effective volume: 500mL);

[0033] 3) at a temperature of 273K, filling the autoclave with a pressure of 5 MPa mixed gas (35% CH 4 , 65% CO 2 ), calculate the CO in the mixed gas at a certain time interval by the change of the pressure in the reactor 2 The content changes, the results are shown in Table 1; take out the gas hydrate;

[0034] 4) Under normal temperature and pressure, the gas hydrate naturally decomposes to obtain high-purity CO 2 Gas, collect the decomposed aqueous solution, mea...

Embodiment 2

[0037] In this embodiment, an aqueous solution with a mass fraction of 0.2% methionine and 2% THF is used as a hydration accelerator, and the salt content is 2.0%.

[0038] The application of hydrate accelerator in brine desalination and carbon dioxide capture specifically includes the following steps:

[0039] 1) Uniformly mix 0.2g methionine, 2g THF and 97.8g brine (2g NaCl, 95.8g water) to obtain a mixed solution;

[0040] 2) Add 100g of the above mixed solution to the autoclave (effective volume: 500mL);

[0041] 3) at a temperature of 273K, filling the autoclave with a pressure of 5 MPa mixed gas (35% CH 4 , 65% CO 2 ), calculate the CO in the mixed gas at a certain time interval by the change of the pressure in the reactor 2 The content changes, the results are shown in Table 1;

[0042] 4) Under normal temperature and pressure, the gas hydrate naturally decomposes to obtain high-purity CO 2 Gas, collect the decomposed aqueous solution, measure the salt content, the...

Embodiment 3

[0045] In this embodiment, an aqueous solution with a mass fraction of 0.01% methionine and 2% THF is used as a hydration accelerator, and the salt content is 2.0%.

[0046] The application of hydrate accelerator in brine desalination and carbon dioxide capture specifically includes the following steps:

[0047]1) Uniformly mix 0.01g methionine, 2g THF and 97.99g brine (2g NaCl, 95.99g water) to obtain a mixed solution;

[0048] 2) Add 100g of the above solution to the autoclave (500mL effective volume);

[0049] 3) at a temperature of 273K, filling the autoclave with a pressure of 5 MPa mixed gas (35% CH 4 , 65% CO 2 ), calculate the CO in the mixed gas at a certain time interval by the change of the pressure in the reactor 2 The content changes, the results are shown in Table 1;

[0050] 4) Under normal temperature and pressure, the gas hydrate naturally decomposes to obtain high-purity CO 2 Gas, collect the decomposed aqueous solution, measure the salt content, the res...

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Abstract

The invention belongs to the technical field of energy, and discloses a gas hydrate accelerant and an application thereof in saline-water desalting and carbon dioxide capturing. The gas hydrate accelerant has active components including dynamic accelerants and thermodynamic accelerants, wherein the dynamic accelerants are more than one kind of amino acid; and the thermodynamic accelerants are more than one of tetrahydrofuran and cyclohexane. The gas hydrate accelerant can be applied to saline-water desalting and carbon dioxide capturing. According to the invention, the amino acid is used as the gas hydrate accelerant, which is nontoxic and harmless, so that induction time of hydrate can be effectively reduced, gas storage capacity and gas storage density of the hydrate can be improved, and seawater can be efficiently separated and desalted, and thus combined application of gas separation and seawater desalting is achieved; THF and the other hydrate are used as stabilizers, so that stability of the gas hydrate can be improved while the formation condition of the hydrate is reduced, and thus industrial operation is facilitated.

Description

technical field [0001] The invention belongs to the technical field of energy, and relates to a gas hydrate accelerator and its application in brine desalination, especially the application in seawater desalination. Background technique [0002] With the development of economy and society, the world's population continues to increase, people's demand for water is increasing, and fresh water resources are increasingly scarce. my country's per capita freshwater resources are only 2,300 cubic meters, which is 1 / 4 of the world's average. The spatial distribution of my country's water resources is extremely uneven in the north and south, and the time distribution is less in spring and winter than in summer, and there is an excessive demand for freshwater resources. Exploitation and utilization, waste of fresh water resources, serious water pollution and other phenomena have restricted economic development and social progress. [0003] Desalination, the desalination of seawater to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52B01D53/78B01D53/62C01B32/50
CPCB01D53/62B01D53/78B01D2257/504C01B2210/0003C02F1/5272C02F2001/5218C02F2103/08Y02C20/40Y02P20/151
Inventor 李啟杰王卫星蔡元浩李亮王素莹郑歆来
Owner SOUTH CHINA UNIV OF TECH
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