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Method for capturing carbon dioxide by sodium hydroxide and sodium carbonate

A carbon dioxide, sodium hydroxide technology, applied in chemical instruments and methods, separation methods, gas treatment and other directions, can solve the problems of easy degradation of alkanolamines, high energy consumption, high cost of alkanolamines, etc., and achieves environmental protection and low use costs. , cost saving effect

Active Publication Date: 2018-12-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the technology and process of this method are mature, it also has the high cost of alcohol amines, the volatility of alcohol amines, the easy degradation of alcohol amines during operation, the need for special corrosion protection for operating equipment, and the desorption of carbon dioxide from alcohol amines. Weaknesses such as high energy consumption

Method used

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  • Method for capturing carbon dioxide by sodium hydroxide and sodium carbonate
  • Method for capturing carbon dioxide by sodium hydroxide and sodium carbonate
  • Method for capturing carbon dioxide by sodium hydroxide and sodium carbonate

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0051] Include the following steps:

[0052] (1) The flue gas from the flue gas channel enters the flue gas purification system for purification treatment;

[0053] (2) The purified flue gas enters the primary absorption tower, and after the carbon dioxide-poor liquid absorbs the carbon dioxide in the flue gas, part of it becomes a carbon dioxide-rich liquid;

[0054] (3) The flue gas that has completed the primary absorption enters the secondary absorption tower from the primary absorption tower. In the secondary absorption tower, the sodium hydroxide solution reacts with the remaining carbon dioxide in the flue gas to form a sodium carbonate solution. carbon dioxide-depleted solution;

[0055] (4) The flue gas that has completed the secondary absorption is emptied after leaving the secondary absorption tower, and the carbon dioxide poor liquid enters the primary absorption tower from the secondary absorption tower to absorb carbon dioxide in the flue gas;

[0056] (5) The ...

Embodiment 2

[0065] For embodiment 1, the more specific steps are:

[0066] (1) Purify the flue gas containing carbon dioxide, remove visible impurities, and perform desulfurization and denitrification treatment;

[0067] (2) Adjust the temperature of the treated flue gas to 50°C, and then undergo a gas-liquid two-phase chemical reaction with the carbon dioxide poor liquid of the sodium carbonate solution in the primary absorption tower, and the carbon dioxide poor liquid of the sodium carbonate solution absorbs the carbon dioxide in the flue gas carbon dioxide;

[0068] (3) The carbon dioxide-poor solution of sodium carbonate solution absorbs carbon dioxide in the flue gas to form a carbon dioxide-rich solution of sodium carbonate solution;

[0069] (4) The carbon dioxide not absorbed by the sodium carbonate solution and the sodium hydroxide solution undergo a gas-liquid two-phase chemical reaction in the secondary absorption tower to form sodium carbonate;

[0070] (5) After the hydrox...

Embodiment 3

[0082] (1) Purify the flue gas containing carbon dioxide, remove visible impurities, and perform desulfurization and denitrification treatment;

[0083] (2) Adjust the temperature of the treated flue gas to 40°C, and then undergo a gas-liquid two-phase chemical reaction with the carbon dioxide poor liquid of the sodium carbonate solution in the primary absorption tower, and the carbon dioxide poor liquid of the sodium carbonate solution absorbs the carbon dioxide in the flue gas carbon dioxide;

[0084] (3) The carbon dioxide-poor solution of sodium carbonate solution absorbs carbon dioxide in the flue gas to form a carbon dioxide-rich solution of sodium carbonate solution;

[0085] (4) The carbon dioxide not absorbed by the sodium carbonate solution and the sodium hydroxide solution undergo a gas-liquid two-phase chemical reaction in the secondary absorption tower to form sodium carbonate;

[0086] (5) After the hydroxide in step (4) is consumed, the solution in the secondar...

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Abstract

The invention relates to the technical field of energy conservation and environmental protection and particularly relates to a method for capturing carbon dioxide by sodium hydroxide and sodium carbonate. The method comprises: (1) flue gas purification, (2) primary absorption of flue gas and a sodium carbonate solution in a primary absorption tower, (3) secondary absorption of carbon dioxide and asodium hydroxide solution in a secondary absorption tower, (4) feeding of the solution in the secondary absorption tower into the primary absorption tower, (5) heating of sodium hydrogen carbonate sothat carbon dioxide is released, (6) collection of carbon dioxide, (7) transformation of the sodium carbonate solution into a sodium hydroxide solution, and (8) circulation of the sodium hydroxide solution to the secondary absorption tower. The method is simple and easy, realizes a low cost and is suitable for carbon dioxide absorption under existing conditions in the power plant and the steel plant.

Description

(1) Technical field [0001] The invention relates to the technical field of energy saving and environmental protection, in particular to a method for capturing carbon dioxide by using sodium hydroxide and sodium carbonate. (2) Background technology [0002] Carbon dioxide is the main greenhouse gas. Because carbon dioxide has the function of heat preservation, it will gradually increase the temperature of the earth's surface. In the past 100 years, the global temperature has risen by 0.6°C. If this continues, it is estimated that by the middle of the 21st century, the global temperature will rise by 1.5-4.5°C. The sea level rise caused by the greenhouse effect will also have a huge impact on the living environment of human beings. At present, countries are paying great attention to controlling carbon dioxide emissions while developing their economies; among them, capturing and storing carbon dioxide is considered to be the most effective means of reducing the greenhouse eff...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/62
CPCB01D53/62B01D53/78B01D2251/304B01D2257/504Y02A50/20Y02C20/40
Inventor 李静王婧惠刘明赵莉张菡英钤小平
Owner UNIV OF SCI & TECH BEIJING