Carbon dioxide capturing method

A technology based on carbon dioxide and primary amines, applied in chemical instruments and methods, separation methods, through absorption, etc., can solve problems such as easy deposition and coalescence, blockage of equipment, and impact on system fluidity, so as to improve capture efficiency and decarbonization The effect of high efficiency and strong solvency

Inactive Publication Date: 2014-09-10
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The additive itself is difficult to obtain, which limits the application of the hydrate method
In addition, due to the CO 2 Hydrate is a solid, easy to deposit and coalesce, block equipment, affect the fluidity of the system, and directly affect the separation effect of mixed gases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1 The relationship between liquid-gas flow ratio and working pressure

[0042] Set the feed gas, CO 2 The volume fraction is 95%, and set at the same decarburization efficiency, change the concentration of ionic liquid, liquid gas flow rate and working pressure in the absorption tower, and investigate the changes, the results are as follows figure 2 shown. At a certain concentration of ionic liquid, the liquid-gas flow ratio decreases with the increase of working pressure. This is due to the higher the pressure, the CO absorbed by the solution 2 more, and CO 2 Hydrates are easier to generate and capture the same CO 2 The smaller the amount of solution required. After the pressure increases to a certain value (4.5MPa), the liquid-gas flow ratio decreases very slowly. Under the same working pressure, the greater the water content of the ionic liquid aqueous solution, the smaller the liquid-gas flow ratio in the process. This is because the greater the w...

Embodiment 2

[0043] Example 2 Liquid-gas flow ratio vs. decarburization efficiency

[0044] Set the feed gas, CO 2 The volume fraction is 95%, the working pressure is 4.0 MPa, and the decarburization efficiency under different liquid-gas flow ratios is as follows: image 3 shown. The decarburization efficiency of ionic liquid solutions with different water contents tends to a certain value with the increase of liquid-gas flow ratio. When the liquid-gas flow ratio is large enough, the maximum decarburization efficiency is about 91% when the water content is 90 wt%, and the maximum decarburization efficiency is 88% and 85% when the water content is 85 wt% and 80 wt%, respectively. After testing, it was found that under different water content conditions, there is an optimal liquid-gas flow ratio (water content is 90wt%, 85wt% and 80wt%, the best liquid-gas flow ratio is 10.62 kg 溶液 / Nm 3 , 11.18 kg 溶液 / Nm 3 and 11.8 kg 溶液 / Nm 3 ), under the optimum liquid-gas flow ratio, it can ensur...

Embodiment 3

[0045] Example 3 Working pressure on decarburization efficiency

[0046] Set the feed gas, CO 2 The volume fraction is 95%, and the CO in the exhaust gas of the absorption tower is used 2 volume fraction to reflect the decarburization effect. The result is as Figure 4 As shown, the CO in the exhaust gas of the absorber 2 The volume fraction decreases almost linearly with the working pressure, indicating that high working pressure is beneficial to CO 2 capture. Higher pressure is not only beneficial for hydrates to capture CO 2 , can also enhance the CO 2 physical absorption. But the working pressure needs to be adjusted in combination with the temperature and according to the actual situation.

[0047] Depend on Figure 5 It can be seen that gas hydrates and ionic liquid solutions each capture CO 2 The relationship between the ratio of the quantity ( ) and the working pressure. Under the conditions of high water concentration and high pressure, CO hydrates are form...

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Abstract

The invention discloses a carbon dioxide capturing method. The carbon dioxide capturing method comprises the steps of absorbing CO2 by using an ion liquid water solution containing primary amine as a CO2 capturing working medium and forming a CO2 hydrate. According to the method, two CO2 capturing modes such as an ion liquid method and a hydrate method are integrated, dual-capturing effects on CO2 through the ion liquid water solution and a gas hydrate are achieved, and the CO2 capturing efficiency is greatly improved, so that the decarburization efficiency is improved. The limitation on an existing ion liquid method caused by ion liquid absorption capacity is overcome, and the stress caused by single hydrate decarburization and the limitation on high CO2 content requirement are eliminated; the method is good in industrial application value.

Description

technical field [0001] The invention relates to the field of carbon dioxide capture and separation, in particular to a CO 2 Simultaneous absorption and hydrate formation dual capture method. Background technique [0002] In recent years, catastrophic climate events have occurred frequently in the world, and the global temperature has become increasingly warmer. Governments and the public are highly concerned. Scientists generally believe that the main cause of global warming is the greenhouse gases emitted by human production and life. Among them, carbon dioxide is considered to be the most important greenhouse gas. Atmospheric carbon dioxide concentration: 280ppm before the industrial revolution, 379ppm in 2005, and a new high of 393.1ppm in 2012. Therefore, it is very urgent and necessary to reduce carbon dioxide emissions, deal with global climate issues, and maintain the sustainable development of human society. Traditional CO 2 The capture methods include absorptio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
CPCY02C10/06Y02A50/20Y02C20/40
Inventor 郭开华李松毕崟杨翠莲皇甫立霞
Owner SUN YAT SEN UNIV
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