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Preparation method of carbon dioxide composite calcium-base absorbent

A composite calcium-based, carbon dioxide technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of decreased carbonation conversion rate of absorbent, aggravated heating surface wear, and increased fresh absorbent, etc. Excellent pore distribution characteristics, improving the recycling rate, and enhancing the effect of carbonation capacity

Inactive Publication Date: 2012-09-12
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have shown that natural calcium-based CO2 such as limestone 2 Absorbents have a serious problem: as the number of calcination / carbonation cycles increases, the carbonation conversion of the absorbent drops rapidly due to sintering
In order to maintain a high CO 2 To improve the removal efficiency, it is necessary to increase the input of fresh absorbent, which will increase the cost, aggravate the wear of the heating surface in the furnace, threaten the safety of equipment and affect the economic operation

Method used

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  • Preparation method of carbon dioxide composite calcium-base absorbent
  • Preparation method of carbon dioxide composite calcium-base absorbent
  • Preparation method of carbon dioxide composite calcium-base absorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0018] According to the molar ratio of calcium and magnesium as n (Ca) :n (Mg) =10:0.75-10:1.5, n (金属离子) :n (柠檬酸) = 1:1 Weigh appropriate amount of calcium nitrate, magnesium nitrate and citric acid, add to H 2 O-C 2 h 5 OH mixed solvent, stir in a magnetic stirrer at 40-50°C until the drug is completely dissolved; then add an appropriate amount of HNO with a concentration of 20% 3 Solution, magnetically stirred for 5-10 minutes; put the stirred solution in a water bath at 80-85°C, evaporate and dehydrate for 6-8 hours to form a gel sample; put it in an oven at 140°C to dry and foam for 3 hours, and grind Finely obtain a light yellow powder; transfer it into a muffle furnace and burn at 300°C for 1-2 hours to obtain a black powder; after grinding, calcinate at 800-850°C for 3 hours to obtain a white powder and obtain a magnesium-modified carbon dioxide composite calcium-based absorbent .

Embodiment approach 2

[0020] According to the mass molar ratio of calcium and manganese as n (Ca) :n (Mn) =100:1-100:2.5, n (金属离子) :n (柠檬酸) = 1:1 Weigh appropriate amount of calcium nitrate, manganese nitrate and citric acid, add to H 2 O-C 2 h 5 OH mixed solvent, stir in a magnetic stirrer at 40-50°C until the drug is completely dissolved; then add an appropriate amount of HNO with a concentration of 20% 3 Solution, magnetically stirred for 5-10 minutes; put the stirred solution in a water bath at 80-85°C, evaporate and dehydrate for 6-8 hours to form a gel sample; put it in an oven at 130°C to dry and foam for 3 hours, and grind Finely obtain a light yellow powder; move it into a muffle furnace and burn at 300°C for 1-2 hours to obtain a black powder; after grinding, calcinate at 800-850°C for 3 hours to obtain a light pink powder that is manganese-modified carbon dioxide composite calcium-based absorption agent.

Embodiment approach 3

[0022] According to the mass molar ratio of calcium and titanium as n (Ca) :n (Ti) =10:0.5-10:1.25, n (Ca) :n (柠檬酸) = 1:1 Weigh an appropriate amount of citric acid, calcium nitrate and butyl titanate, add to H 2 O-C 2 h 5 OH mixed solvent, stir in a magnetic stirrer at 40-50°C until the drug is completely dissolved; then add an appropriate amount of HNO with a concentration of 20% 3 Solution, magnetically stirred for 5-10 minutes; put the stirred solution in a water bath at 80-85°C, evaporate and dehydrate for 6-8 hours to form a gel sample; put it in an oven at 150°C to dry and foam for 3 hours, and grind Finely obtain light yellow powder; transfer to a muffle furnace and burn at 300°C for 1-2 hours to obtain a black powder; after grinding, calcinate at 800-850°C for 3 hours to obtain a white powder and obtain titanium-modified carbon dioxide composite calcium-based absorbent .

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Abstract

The invention discloses a preparation method of a carbon dioxide composite calcium-base absorbent. Citric acid and nitrate are used as raw materials to prepare the composite calcium-base absorbent doped with other metal oxides by a sol-gel process. The preparation method comprises the following steps: by using calcium nitrate as the main raw material, other metal nitrates as a modifier and citric acid as a complexing agent, carrying out solution mixing, dehydrating by evaporation to obtain a gel, drying and carrying out heat treatment on the gel, and calcining at 800 DEG C in an air atmosphere for 3 hours, thereby obtaining the carbon dioxide composite calcium-base absorbent. The carbon dioxide composite calcium-base absorbent prepared by the method disclosed by the invention has high carbon dioxide absorption capacity and stable reaction activity, and has high CO2 capture rate in multiple-circulating calcining / carbonating reaction process; and the carbon dioxide composite calcium-base absorbent has favorable properties in the aspects of CO2 capture efficiency, mechanical strength, caking resistance and the like in the circulating calcining / carbonating process.

Description

technical field [0001] The invention relates to a preparation method of a carbon dioxide composite calcium-based absorbent for removing CO in flue gas 2 craft. The invention belongs to the technical field of environmental pollution prevention and clean coal combustion. Background technique [0002] Climate change is one of the global issues that the international community is generally concerned about today, and has become an important factor affecting the sustainable economic and social development of various countries in the future. In December 2009, at the Climate Change Conference in Copenhagen, most countries recognized the seriousness of the environmental problems caused by climate change and expressed that they should assume their respective responsibilities in dealing with climate change. The conclusion of the "Copenhagen Accord" is the international community's commitment to the global reduction of CO2 emissions. 2 new milestone. [0003] Carbon dioxide is the m...

Claims

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Application Information

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IPC IPC(8): B01D53/62B01D53/81
CPCY02A50/20Y02C20/40
Inventor 段钰锋张平平陈惠超赵长遂陈晓平
Owner SOUTHEAST UNIV
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