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A method for capturing carbon dioxide using sodium hydroxide and sodium carbonate

A carbon dioxide, sodium hydroxide technology, applied in chemical instruments and methods, separation methods, dispersed particle separation and other directions, can solve the problems of easy degradation of alkanolamines, high cost of alkanolamines, high energy consumption, etc., to protect the environment and save costs. , the effect of low cost of use

Active Publication Date: 2021-04-16
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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  • A method for capturing carbon dioxide using sodium hydroxide and sodium carbonate
  • A method for capturing carbon dioxide using sodium hydroxide and sodium carbonate
  • A method for capturing carbon dioxide using sodium hydroxide and sodium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055]Include the following steps:

[0056](1) Flue gas from the smoke passage into the flue gas purification system for purification;

[0057](2) The purified flue gas enters the primary absorption tower, the carbon dioxide lean solution absorbs carbon dioxide in the flue gas, and partially changes into carbon dioxide rich liquid;

[0058](3) Complete the one-absorbed flue gas from the primary absorption tower into the secondary absorption tower, in the secondary absorption tower, the sodium hydroxide solution is reacted with the remaining carbon dioxide in the flue gas, which is mainly based on sodium carbonate solution. Carbon dioxide lean fluid;

[0059](4) After completing the secondary absorption of flue gas, the secondary absorption tower is subjected to emptying, and the carbon dioxide can eject the carbon dioxide in the absorbent tower from the second absorption tower;

[0060](5) The carbon dioxide exterior in the primary absorption tower enters the carbon dioxide hydrolysis system, and ...

Embodiment 2

[0069]More specifically for Example 1:

[0070](1) Purify the flue gas containing carbon dioxide, remove visible impurities, and perform desulfurization denitration treatment;

[0071](2) Adjusting the temperature of the treated flue gas to 50 ° C, then the carbon dioxide hydrocarbon hydrazine in the sodium carbonate solution, a gas solution in the primary absorption tower, and the carbon dioxide hydrauline hydrazine solution absorbs the flue gas. carbon dioxide;

[0072](3) Carbon dioxide hydrocarbon hydrazine hydrazine absorbing carbon dioxide in the flue gas forms the carbon dioxide rich liquid of sodium carbonate solution;

[0073](4) The carbon dioxide and the sodium hydroxide solution are not absorbed by the sodium hydroxide solution in the secondary absorption tower, and sodium carbonate is formed.

[0074](5) When the hydroxide root in step (4) is consumed, the solution in the secondary absorption tower is delivered to the primary absorption tower;

[0075](6) Introduction of the carbon dioxi...

Embodiment 3

[0086](1) Purify the flue gas containing carbon dioxide, remove visible impurities, and perform desulfurization denitration treatment;

[0087](2) Adjust the temperature of the treated flue gas to 40 ° C, then the carbon dioxide thyristor in the sodium carbonate solution, a gas solution in the primary absorption tower, and the carbon dioxide hydrauline hydrocarbon hydrazine absorbed in the smoke. carbon dioxide;

[0088](3) Carbon dioxide hydrocarbon hydrazine hydrazine absorbing carbon dioxide in the flue gas forms the carbon dioxide rich liquid of sodium carbonate solution;

[0089](4) The carbon dioxide and the sodium hydroxide solution are not absorbed by the sodium hydroxide solution in the secondary absorption tower, and sodium carbonate is formed.

[0090](5) When the hydroxide root in step (4) is consumed, the solution in the secondary absorption tower is delivered to the primary absorption tower;

[0091](6) Introduction of the carbon dioxide rich solution of the sodium carbonate solution...

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Abstract

The invention relates to the technical field of energy conservation and environmental protection, and in particular to a method for capturing carbon dioxide using sodium hydroxide and sodium carbonate. (1) Flue gas purification; (2) Flue gas and sodium carbonate solution are absorbed for the first time in the primary absorption tower; (3) Carbon dioxide and sodium hydroxide solution are absorbed for the second time in the secondary absorption tower; (4) Transport the solution in the secondary absorption tower to the primary absorption tower; (5) Sodium bicarbonate is thermally decomposed to release carbon dioxide; (6) Carbon dioxide is collected. (7) The sodium carbonate solution is converted into a sodium hydroxide solution; (8) The sodium hydroxide solution is circulated to the secondary absorption tower; 1. The process of the present invention is simple and easy to implement, has low cost of use, and can utilize existing wastewater in power plants and steel plants. conditions for the absorption of carbon dioxide.

Description

[0001] (1) Technical field [0002] The invention relates to the technical field of energy conservation and environmental protection, and in particular to a method for capturing carbon dioxide using sodium hydroxide and sodium carbonate. [0003] (2) Background technology [0004] Carbon dioxide is the main greenhouse gas. Because carbon dioxide has a thermal insulation effect, it will gradually increase the temperature of the earth's surface. In the past 100 years, the global temperature has increased by 0.6°C. If this continues, it is expected that by the middle of the 21st century, the global temperature will increase by 1.5-4.5°C. The rise in sea levels caused by the greenhouse effect will also have a huge impact on the human living environment. At present, while developing the economy, various countries attach great importance to controlling carbon dioxide emissions; among them, capturing and storing carbon dioxide is considered to be the most effective means of reducing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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