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Improved CO2 inorganic absorbing agent

An inorganic absorbent and additive technology, applied in the direction of inorganic chemistry, through absorption, reagents, etc., can solve the problems of wide range of industrial application restrictions, strong corrosion of equipment, high cost of absorbent, etc., to achieve low equipment corrosion, low cost, Effect of low regenerative energy consumption

Active Publication Date: 2013-01-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as absorbents, organic amines have problems such as high cost of absorbents, high regeneration energy consumption, strong corrosion to equipment, etc., and their wide-ranging industrial applications are limited.

Method used

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  • Improved CO2 inorganic absorbing agent
  • Improved CO2 inorganic absorbing agent
  • Improved CO2 inorganic absorbing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Firstly prepare 2L ammonia carbide solution, the density of 5% ammonia water is found to be 0.98g / cm 3 , the density of 25% ammonia water is 0.91g / cm 3 . The total ammonia mass fraction of the ammonia carbide solution that needs to be prepared is 5%, CO 2 The loading capacity is 0.3, the ammonium carbonate solution is prepared by using ammonia water, ammonium carbonate and deionized water, and the additive selected is sodium phosphate dodecahydrate.

[0031] Assume that the ammonia molecule in ammonia water is xmol, ammonium carbonate is ymol, and x and y satisfy the following two equations:

[0032] y x + 2 y = 0.3

[0033] x + 2 y = 5 % × 0.98 g / cm ...

Embodiment 2

[0049] The preparation method of the ammonia carbide solution is the same as in Example 1, and the total ammonia mass fraction obtained after preparation is 5%, and the CO 2 The ammonia carbide solution with a loading capacity of 0.5 is used as the main part of the absorbent, the packed tower is used as the reaction device, and the imported CO 2 The concentration is 15%, and the gas-liquid ratio is 70. Adding sodium phosphate to the solution of ammonia carbide, when the ratio of the concentration of sodium phosphate to the concentration of total ammonia is 0.04, compared with the solution of ammonia carbide without adding sodium phosphate, CO 2 The removal efficiency increased by 7.3 percentage points; when the ratio of its added concentration to the total ammonia concentration was 0.10, CO 2 The removal efficiency increased by 14.1 percentage points. When the ratio of its added concentration to total ammonia concentration is 0.20, CO 2 The removal efficiency increased by 1...

Embodiment 3

[0051] The preparation method of the ammonia carbide solution is the same as in Example 1, and the total ammonia mass fraction obtained after preparation is 5%, and the CO 2 The ammonium carbide solution with a loading capacity of 0.7 is used as the main part of the absorbent, the packed tower is used as the reaction device, and the imported CO 2 The concentration is 15%, and the gas-liquid ratio is 70. Adding sodium phosphate to the solution of ammonia carbide, when the ratio of the concentration of sodium phosphate to the concentration of total ammonia is 0.04, compared with the solution of ammonia carbide without adding sodium phosphate, CO 2 The removal efficiency increased by 8.5 percentage points; when the ratio of its added concentration to the total ammonia concentration was 0.10, CO 2 The removal efficiency increased by 16.0 percentage points; when the ratio of its added concentration to total ammonia concentration was 0.20, CO 2 The removal efficiency increased by ...

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Abstract

The invention discloses an improved CO2 inorganic absorbing agent which comprises carbonated aqueous ammonia and an additive, wherein the total ammonia mass percent of the carbonated aqueous ammonia is 4-12 percent, the additive is sodium phosphate or potassium phosphate, the ratio of the mol concentration of the addition to the total ammonia mol concentration of the carbonated aqueous ammonia is0.04-0.20, and the balance is deionized water. The CO2 inorganic absorbing agent is suitable for decarburization of a coal fired power plant and an industrial process, and has the advantages of low solvent cost, low regeneration energy consumption, little equipment corrosion and the like compared with an organic ammonia solution, and has the advantages of small ammonia volatilization amount, highCO2 removing rate, high CO2 deabsorption rate and the like compared with the simple ammonia solution.

Description

technical field [0001] The invention belongs to the technical field of gas separation, in particular to an improved carbon dioxide inorganic absorbent. Background technique [0002] Coal-fired power plant CO 2 Emissions are the most important source of greenhouse gas emissions in my country. In order to achieve CO 2 Emission reduction requirements and the sustainable development of coal-fired power generation in my country, the capture and fixation of CO emitted by coal-fired power plants 2 It is an urgent task. Separation and capture of CO from flue gas 2 The methods include chemical absorption method, adsorption method, membrane separation method and so on. [0003] The chemical absorption method is the most mature and widely used technology in the decarbonization process at present. Commonly used absorbents are organic amines. CO in the flue gas of my country's first coal-fired power station 2 The capture demonstration device is the MEA process used. The demonstrat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14B01D53/62B01D53/78C01B31/20C01B32/50
CPCY02C10/04Y02C10/06Y02A50/20Y02C20/40Y02P20/151
Inventor 刘越张佩芳吴忠标王海强
Owner ZHEJIANG UNIV