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Modified calcium-based absorbent for absorbing CO2, and preparation method thereof

A calcium-based absorbent and modification technology, applied in the field of CO2 capture, can solve the problem of low anti-sintering performance, achieve the effects of improving anti-sintering performance, reducing mutual contact, and increasing carbonation rate

Inactive Publication Date: 2017-02-22
NANJING XINYUE MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect of low sintering resistance of calcium-based absorbents in the prior art, thereby improving a modified calcium-based absorbent with high sintering resistance

Method used

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  • Modified calcium-based absorbent for absorbing CO2, and preparation method thereof
  • Modified calcium-based absorbent for absorbing CO2, and preparation method thereof
  • Modified calcium-based absorbent for absorbing CO2, and preparation method thereof

Examples

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Embodiment 1

[0028] This embodiment provides a method for absorbing CO 2 The modified calcium-based absorbent includes limestone, and the nanofiber material attached to the surface of the limestone; the nanofiber material accounts for 1%-20% by weight of the modified calcium-based absorbent.

[0029] This modified calcium-based absorbent, with nanofibrous material as an additive, is adsorbed on the surface of limestone and acts as a skeleton, which can effectively reduce the mutual contact between limestone particles and avoid the capture of CO by limestone particles in the cycle. 2 The sintering and fusion between the particles during the process greatly improves the anti-sintering ability of the calcium-based absorbent and greatly improves the carbonation rate; at the same time, the content of nanofiber materials in the modified calcium-based absorbent should not be too high , if it is too high, the content of limestone in the calcium-based absorbent is low, and it itself absorbs CO 2 T...

Embodiment 2

[0033] This embodiment 2 provides a method for absorbing CO provided in embodiment 1 2 The preparation method of the modified calcium-based absorbent, comprising the following steps:

[0034] According to the proportioning relationship between the limestone and the nanofiber material in the above-mentioned embodiment 1, the limestone and the nanofiber material are matched, and then the prepared limestone and the nanofiber material are dissolved in an organic solvent, and after being fully dispersed, the The mixed liquid is dried in an oven, and the modified calcium-based absorbent is prepared after drying.

[0035] Limestone and nanofibrous materials are dissolved in an organic solvent. In view of the fact that nanofibrous materials are easily dispersed in organic solvents, it is convenient for nanofibrous materials to fully adsorb on the surface of limestone; during the entire preparation process, only simple physical mixing and drying, The preparation method is simple, the ...

Embodiment 3

[0052] This embodiment provides a method for absorbing CO 2 The difference between the preparation method of the modified calcium-based absorbent and Example 2 is that the nanofibrous material is purified before the limestone is mixed with the nanofibrous material.

[0053] For example, if attapulgite is used as nanofiber material, attapulgite raw ore is firstly purified, and the purification steps are as follows:

[0054] (1) Weigh 15-20g of natural attapulgite raw ore, 0.3-0.4g of sodium hexametaphosphate, add 1500mL of deionized water, fully disperse, and mechanically stir for 1.5-2 hours;

[0055] (2) The stirred mixed solution is activated in a water bath at 95-100° C. for 2 hours with 1 mol / L hydrochloric acid solution;

[0056] (3) Add 4.5-5 g of EDTA disodium salt to the activated mixed solution, stir it electromagnetically for 1.5-2 hours, centrifuge and wash twice after 24 hours, and recover the solid;

[0057] (4) Add 22-25g of anhydrous Na in the recovered solid ...

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Abstract

The present invention discloses a modified calcium-based absorbent for absorbing CO2, and a preparation method thereof, wherein the modified calcium-based absorbent comprises limestone and a nanometer fiber material adsorbed on the surface of the limestone, the nanometer fiber material accounts for 1-20% of the weight of the modified calcium-based absorbent, and the nanometer fiber material adsorbed on the limestone surface is adopted as the skeleton, such that the mutual contact between the limestone particles can be effectively reduced, and the sintering and the fusion of the limestone particles during the circulation capturing of CO2 so as to substantially improve the anti-sintering ability of the calcium-based absorbent and substantially improve the carbonation rate. According to the present invention, the preparation method comprises: dissolving limestone and a nanometer fiber material into an organic solvent according to a certain matching ratio, completely dispersing, placing the mixed liquid into an oven, and drying to prepare the calcium-based absorbent; and the whole preparation process is only the simple physical mixing and drying, and the preparation method is simple and has the low cost.

Description

technical field [0001] The invention relates to a method for absorbing CO 2 Modified calcium-based absorbent and preparation method thereof, belonging to CO 2 capture technology field. Background technique [0002] In recent years, climate change caused by the greenhouse effect has become an increasingly serious threat to the earth's atmospheric environment and human existence. Among them, CO 2 Due to its high content in the atmosphere and long life cycle, the gas contributes more than 60% to the greenhouse effect and is the gas that has the greatest impact on the greenhouse effect. Under the demand of developing low-carbon economy, reduce CO 2 emissions has become the focus of the work of all countries. [0003] Since the 21st century, my country's CO 2 China's carbon dioxide emissions have been at the forefront of the world. According to statistics from the Carbon Dioxide Information Analysis Center (CDIAC) of the U.S. Department of Energy, in 2010, my country's CO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/12B01D53/02
CPCY02C20/40
Inventor 闵永刚单历元于有海孟冰露李江锋孟晶晶
Owner NANJING XINYUE MATERIAL SCI & TECH
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