Preparation method of modified carbon dioxide calcium-based absorbent

A calcium-based absorbent and carbon dioxide technology, applied in the field of environmental emission control, can solve the problems of reduced carbonation conversion rate, porosity, and surface area, and achieve strong anti-sintering performance, good pore structure distribution, and high cycle absorption efficiency effect

Active Publication Date: 2013-10-02
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is because during the calcination process, the sintering of the absorbent surface leads to a decrease in its surface area and a decrease in porosity.
[0010] For example, the Chinese invention patent application (application publication number CN102658010A, application publication date 2012.09.12) discloses a preparation method of a carbon dioxide composite calcium-based absorbent. Although it has a high carbon dioxide absorption capacity, its carbonic acid drop in conversion rate

Method used

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  • Preparation method of modified carbon dioxide calcium-based absorbent
  • Preparation method of modified carbon dioxide calcium-based absorbent
  • Preparation method of modified carbon dioxide calcium-based absorbent

Examples

Experimental program
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Embodiment 1

[0027] Weigh an appropriate amount of calcium nitrate and magnesium nitrate according to the molar ratio of calcium metal ion and magnesium metal ion as 10: 0.5 (converted into the corresponding CaO and MgO mass according to the molar ratio of calcium and magnesium ions, and then converted into the content of MgO, such as this example The calcium-magnesium molar ratio of 10:0.5 in the formula can be converted into 560g of CaO and 20g of MgO, then the content of MgO in this example is 20 / (560+20)=3.5%), according to calcium-magnesium metal ions, citric acid The molar ratio to ethylene glycol is 0.8:1:1.5 Weigh an appropriate amount of citric acid and ethylene glycol, dissolve the weighed calcium nitrate, magnesium nitrate and citric acid in deionized water, and stir at 20°C until completely Dissolve to form a mixed solution, add the weighed ethylene glycol into the mixed solution, and stir in a constant temperature water bath at 80°C until it becomes a paste, then evaporate and ...

Embodiment 2

[0029] Take by weighing an appropriate amount of calcium nitrate and magnesium nitrate according to the molar ratio of calcium metal ion and magnesium metal ion as 10:0.7, and take an appropriate amount of lemon by weighing the molar ratio of calcium magnesium ion, citric acid and ethylene glycol as 0.9:1:1.5 Acid and ethylene glycol, dissolve the weighed calcium nitrate, magnesium nitrate and citric acid in deionized water, stir at 30°C until completely dissolved to form a mixed solution, add the weighed ethylene glycol into the mixed solution , and stirred in a constant temperature water bath at 80°C until it became a paste, then evaporated and dehydrated to form a gel, put the formed gel into an oven at 120°C for drying, dry and grind to obtain a solid powder, and then calcined at 850°C for 4 hours to prepare A secondary modified carbon dioxide calcium-based absorbent is obtained.

Embodiment 3

[0031] Take by weighing an appropriate amount of calcium nitrate and magnesium nitrate by calcium metal ion and magnesium metal ion molar ratio is 10: 1.6, by weighing an appropriate amount of lemon acid and ethylene glycol, dissolve the weighed calcium nitrate, magnesium nitrate and citric acid in deionized water, stir at 50°C until completely dissolved to form a mixed solution, add the weighed ethylene glycol into the mixed solution , and stirred in a constant temperature water bath at 80°C until it became a paste, evaporated and dehydrated to form a gel, put the formed gel in an oven at 125°C for drying, dry and grind to obtain a solid powder, and then calcined at 900°C for 5 hours to prepare A secondary modified carbon dioxide calcium-based absorbent is obtained.

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Abstract

The invention relates to a preparation method of a modified carbon dioxide calcium-based absorbent. The method comprises the steps of dissolving calcium nitrate, magnesium nitrate and citric acid in deionized water at the temperature of 20-50 DEG C to form a mixed solution, adding ethylene glycol into the mixed solution, carrying out evaporating dehydration in water bath at the temperature of 80-85 DEG C to form gel, drying the gel in a drying oven at the temperature of 120-130 DEG C, grinding the dried gel to obtain solid powder, calcining the solid powder at the temperature of 800-900 DEG C for 2-5 hours and obtaining the modified carbon dioxide calcium-based absorbent. The carbon dioxide calcium-based absorbent prepared through two modifications (the magnesium nitrate is the primary modifier and the ethylene glycol is the secondary modifier) has the advantages of high carbon dioxide cyclic absorption efficiency, strong sintering resistance and good pore structure distribution at the same time, so that the carbon dioxide calcium-based absorbent still has high carbon dioxide collecting efficiency in the multiple cyclic calcination / carbonation reaction processes and the defects of the existing carbon dioxide calcium-based absorbents, that the superficial area is decreased and the porosity is reduced after multiple cyclic calcinations, are overcome.

Description

technical field [0001] The invention belongs to the field of environmental emission control, and in particular relates to a preparation method of a modified carbon dioxide calcium-based absorbent, which can be used to capture carbon dioxide in flue gas produced by burning fossil fuels, biomass and other fuels. Background technique [0002] Greenhouse gases and climate change are one of the core issues currently being studied by countries all over the world. CO 2 It is one of the main gases that cause the greenhouse effect, and it is also a potential carbon resource. In recent years, more and more researchers believe that CO 2 Global warming and sea level rise caused by the greenhouse effect as the dominant factor are threatening the survival of human beings, and CO in the atmosphere 2 Mainly from fossil fuels, biomass combustion and animal metabolism products. [0003] With the rapid development of my country's economy, carbon dioxide emissions have also increased to a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/81B01D53/62
CPCY02A50/20
Inventor 米铁余新明黄震
Owner JIANGHAN UNIVERSITY
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