Solid absorbent with high CO2 adsorption capacity and preparation method thereof

A technology of adsorption capacity and absorbent, which is applied in the field of solid absorbent with high CO2 adsorption capacity and its preparation, can solve the problems of reducing specific surface area, reducing decarbonization ability of absorbent and pore blockage, etc., achieving large specific surface area and easy automation The effect of improving management and decarbonization capabilities

Inactive Publication Date: 2013-08-07
SOUTHEAST UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] The above-mentioned patents are all prepared by mixing the existing materials with the carrier material and the active material by means of impregnation method, which cannot change the inherent characteristics of the original carrier material, such as pore structure, specific surface area, etc. Conventional impregnation method, Loading methods such as spraying will reduce the pore structure of the carrier material itself to a certain extent, such as the carrier material γ-Al 2 o 3 , after the carbonate is loaded, its specific surface area will decrease, and when it is loaded, too much active ingredient will cause the pores of the carrier material to be blocked. Therefore, there are great limitations in the preparation of the absorbent, and it is necessary to use A large amount of carrier material (above 60wt%) provides sufficient specific surface area for the active ingredient, thereby reducing the overall decarburization capacity of the absorbent

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  • Solid absorbent with high CO2 adsorption capacity and preparation method thereof
  • Solid absorbent with high CO2 adsorption capacity and preparation method thereof
  • Solid absorbent with high CO2 adsorption capacity and preparation method thereof

Examples

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preparation example Construction

[0033] above high CO 2 The preparation method of the solid absorbent of adsorption capacity, comprises the following steps:

[0034] Step 1. Mix a certain mass concentration of alkali metal carbonate solution, silane coupling agent with amino groups (γ-aminopropyltriethoxysilane or γ-aminopropyltrimethoxysilane), ethyl orthosilicate Ester and ethanol are mixed in a volume ratio of 1 to 3:1 to 3:1:3, and the mixed solution is stirred until it becomes an emulsion;

[0035] Step 2, placing the emulsion obtained in step 1 in the air, pouring the emulsion at an angle of preferably 45° until the emulsion cannot flow, and obtaining a cross-linked gel;

[0036] Step 3. Place the gel obtained in Step 2 in a closed desiccator for a drying time of 1 to 5 hours, preferably 1 hour;

[0037] Step 4. Soak the gel obtained in Step 3 with ethanol for 24 to 48 hours, preferably 24 hours;

[0038] Step 5. Use the supercritical drying method to dry and sieve the gel obtained in step 4 to prepa...

Embodiment 1

[0043] Weigh 1.3g of sodium carbonate and dissolve it in 50ml of water, measure 50ml of ethyl orthosilicate and 50ml of γ-aminopropyltriethoxysilane respectively, put the above three solutions into 150ml of ethanol, place them on a stirrer and stir for 10 After the solution turns into an emulsion, stop stirring and place it in the air. When the solution is poured at 45° and the solution does not flow, the solution will be cross-linked. Put the cross-linked gel in an airtight dry place and store it for 1 hour. Afterwards, the gel was soaked in ethanol for 24 hours to replace the moisture contained in the gel. Finally, the gel was dried by supercritical drying method and sieved. The drying temperature was 45°C and the drying pressure was 20Mpa, so as to prepare high CO 2 Adsorption capacity of solid absorbents.

[0044] Each component and its mass percentage in the solid absorbent prepared in this example: active component, 15%, wherein sodium carbonate content: 4.1%, amine grou...

Embodiment 2

[0063] Weigh 10g of sodium carbonate and dissolve it in 50ml of water, measure 50ml of ethyl orthosilicate and 100ml of γ-aminopropyltriethoxysilane respectively, put the above three solutions into 150ml of ethanol, place them on a stirrer and stir for 10 minutes , stop stirring after the solution turns into an emulsion, and place it in the air. When the solution is poured at 45° and does not flow, the solution will be cross-linked, and the cross-linked gel will be placed in an airtight dry place for 5 hours. After that, the gel was soaked in ethanol for 48 hours to replace the water contained in the gel. Finally, the gel was dried by supercritical drying method and sieved. The drying temperature was 30°C and the drying pressure was 15Mpa, thereby preparing a high CO 2 Adsorption capacity of solid absorbents.

[0064] Each component and its mass percentage in the solid absorbent prepared in this example: active component, 30%, wherein sodium carbonate content: 17.9%, amine gro...

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Abstract

The invention discloses a solid absorbent with high CO2 adsorption capacity and a preparation method thereof. The solid absorbent comprises active components and a carrier; the active components are alkali carbonate and an amino group at the surface of the carrier, and are 15-60% of total quality of the solid absorbent; the molar ratio of the alkali carbonate and the amino group is 1 to (0.5-25); and the carrier is monox, and is 40-85% of total quality of the solid absorbent. The preparation method comprises the following steps of mixing and stirring the materials into emulsion; putting the emulsion into air to form cross-linking gel; putting the gel into a sealed dryer; soaking the gel by ethanol; and drying and screening the gel by a supercritical drying method, so as to prepare the solid absorbent with high CO2 adsorption capacity. The absorbent is low in price, stable in structure, high in carbonic acid conversion ratio, not easy to inactivate, and small in corrosion on equipment, and has certain mechanical strength, and high cyclic utilization rate; and the preparation method of the absorbent is convenient to operate, and low in expenses.

Description

technical field [0001] The invention relates to the field of absorbents and preparation methods, in particular to a high CO 2 Solid absorbent with adsorptive capacity and method for its preparation. Background technique [0002] The greenhouse effect and its impact have increasingly become the focus of worldwide attention. Among them, CO 2 The massive emission of greenhouse gases is the main reason for the increasing greenhouse effect. According to the blueprint of the Energy Technology Statistics Bureau (ETP) of the International Energy Agency (IEA) in 2008, it is estimated that by 2050, CO 2 Annual emissions will rise to about 57GT, the current CO 2 Double the annual emissions of 29GT. In order to remove CO from the atmosphere 2 When the concentration is controlled within 450ppm in 2050, CO 2 Annual emissions must be reduced to 14GT, which will be a major challenge. Since 2008, China's CO 2 The annual emission is 7GT, surpassing the United States by 5.5GT and rank...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30B01D53/81B01D53/62
CPCY02A50/20
Inventor 陈晓平吴烨董伟张中林刘道银梁财
Owner SOUTHEAST UNIV
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