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Anhydrous carbon dioxide absorbent and method for absorbing/desorbing carbon dioxide

A carbon dioxide and absorbent technology, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., can solve the problem that solid materials are difficult to recycle in continuous flow, inconvenient for large-scale, continuous operation, and heat integration systems cannot be efficient Land use and other issues, to achieve the effect of good carbon dioxide selectivity, high carbon dioxide absorption, and low regeneration energy consumption

Inactive Publication Date: 2018-12-04
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But thermal integration systems cannot be efficiently used in solid state, and the energy efficiency in carbon capture process is very low
Secondly, solid materials are difficult to achieve continuous flow recycling, which is not convenient for large-scale and continuous operation

Method used

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  • Anhydrous carbon dioxide absorbent and method for absorbing/desorbing carbon dioxide
  • Anhydrous carbon dioxide absorbent and method for absorbing/desorbing carbon dioxide

Examples

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preparation example Construction

[0029] A preparation method of anhydrous carbon dioxide absorbent, comprising the following steps:

[0030] A. Dissolve the amine in methanol and stir until completely dissolved to obtain a mixed solution;

[0031] B. Add hollow silica microspheres or porous silica microspheres to the mixed solution obtained in step A, continue to stir and react for 2 to 8 hours, and vacuum dry after the reaction to obtain amine-modified silica microspheres ;

[0032] C, mixing amine-modified silica microspheres with 2-[2-(dimethylamino)ethoxyl]ethanol to obtain amine-modified silica microsphere emulsion-like anhydrous carbon dioxide absorbent; amine-modified The mass fraction range of the silicon dioxide microspheres in the absorbent is 5wt%-40wt%.

[0033] In a specific embodiment, the hollow silica microspheres are prepared according to the following steps: adding polystyrene (PS) powder to a mixed solution of ethanol and water and ultrasonically dispersing for 0.5-1.5 hours, and then dis...

Embodiment 1

[0042] A. As a comparison, weigh about 10 mg of amine-modified porous silica microspheres and put them in a physical absorption instrument to measure the absorption of polyethyleneimine-modified porous silica microspheres.

[0043] B. As a comparison, weigh about 5g of pure liquid phase absorbent 2-[2-(dimethylamino)ethoxy]ethanol and place it in the absorption kettle, turn on the vacuum pump to evacuate the system, and when the absorption system remains in a vacuum state , close the absorption system, pass carbon dioxide into the absorption tank for absorption, and obtain the carbon dioxide of the absorbent by measuring the pressure of the absorption system at different times, and the absorption reaches equilibrium when the pressure of the absorption system remains unchanged within 30 minutes.

[0044] C. Take by weighing about 5g of the absorbent of the present invention and place it in the absorption kettle. The absorbent of the invention adopts amine-modified porous silica ...

Embodiment 2

[0048] Weigh about 5 g of polyethyleneimine modified absorbent PEI (600), diethylenetriamine modified absorbent DETA and ionic liquid modified absorbent respectively for carbon dioxide absorption. The carbon dioxide absorption capacity of sexual absorbent, diethylenetriamine modified absorbent and ionic liquid modified absorbent is 0.5067mmol / g, 0.8875mmol / g and 0.4534mmol / g respectively.

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Abstract

The invention discloses an anhydrous carbon dioxide absorbent and a method for absorbing / desorbing carbon dioxide. A preparation method for the anhydrous carbon dioxide absorbent comprises the following steps: dissolving amine into methanol, and carrying out stirring until the amine is completely dissolved, so as to obtain a mixed solution; adding hollow silicon dioxide microspheres or porous silicon dioxide microspheres in the obtained mixed solution, continuing to carry out a reaction for 2 to 8 hours with stirring, and carrying out vacuum drying after the reaction ends up, so as to obtain amine modified silicon dioxide microspheres; and mixing the amine modified silicon dioxide microspheres with 2-[2-(dimethylamino)ethoxy]ethanol, thereby obtaining an amine modified silicon dioxide microsphere emulsion shaped anhydrous carbon dioxide absorbent, wherein the mass percent range of the amine modified silicon dioxide microspheres in the absorbent is 5wt% to 40wt%. The carbon dioxide absorption capacity of the anhydrous carbon dioxide absorbent is more than the double of the sum of absorption capacity of a pure solid adsorbent and absorption capacity of a pure liquid-phase absorbent,so that the anhydrous carbon dioxide absorbent can be applied to industries with high carbon dioxide emission such as fossil fuel power plants, cement plants, steel works and oil refineries.

Description

technical field [0001] The invention relates to an absorbent, in particular to an anhydrous carbon dioxide absorbent and a method for absorbing and desorbing carbon dioxide. Background technique [0002] Carbon dioxide is considered the main greenhouse gas. With the large-scale exploitation and utilization of fossil energy, a large amount of carbon dioxide is emitted, which intensifies the global greenhouse effect and poses a threat to the human environment and survival. Therefore, effectively reducing carbon dioxide emissions has become a research hotspot in recent years. [0003] In order to reduce carbon dioxide emissions, improve the global climate and environment, and ensure the long-term survival of human beings. In 2009, the Chinese government promised at the World Climate Conference in Copenhagen that by 2020, carbon dioxide emissions per unit of GDP would be reduced by 40% to 45% compared with 2005. [0004] According to data from the International Energy Agency (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
CPCB01D53/1425B01D53/1475B01D53/1493Y02A50/20Y02C20/40
Inventor 丁玉栋李晓强廖强朱恂王宏陈蓉李俊郭李恒
Owner CHONGQING UNIV
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