Study on CO<sub>2</sub> absorption-mineralization characteristics of mixed amine solution coupled with CaO and key influencing factors in mineralization process

WANG Zhong-hui; SU Sheng; MA Zhi-wei; SONG Ya-wei; CHEN Yi-feng; LIU Tao; JIANG Long; WANG Yi; HU Song; XIANG Jun

doi:10.1016/S1872-5813(22)60020-3

Volume 50 Issue 10

Oct. 2022

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Article Navigation > Journal of Fuel Chemistry and Technology > 2022 > 50(10): 1371-1380

WANG Zhong-hui, SU Sheng, MA Zhi-wei, SONG Ya-wei, CHEN Yi-feng, LIU Tao, JIANG Long, WANG Yi, HU Song, XIANG Jun. Study on CO2 absorption-mineralization characteristics of mixed amine solution coupled with CaO and key influencing factors in mineralization process[J]. Journal of Fuel Chemistry and Technology, 2022, 50(10): 1371-1380. doi: 10.1016/S1872-5813(22)60020-3

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WANG Zhong-hui, SU Sheng, MA Zhi-wei, SONG Ya-wei, CHEN Yi-feng, LIU Tao, JIANG Long, WANG Yi, HU Song, XIANG Jun. Study on CO₂ absorption-mineralization characteristics of mixed amine solution coupled with CaO and key influencing factors in mineralization process[J]. Journal of Fuel Chemistry and Technology, 2022, 50(10): 1371-1380. doi: 10.1016/S1872-5813(22)60020-3

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Study on CO₂ absorption-mineralization characteristics of mixed amine solution coupled with CaO and key influencing factors in mineralization process

doi: 10.1016/S1872-5813(22)60020-3

State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Hubei 430074, China

Funds: The project was supported by National Natural Science Foundation of China (U20A20302).

Received Date: 2022-02-22
Accepted Date: 2022-04-07
Rev Recd Date: 2022-04-02

Available Online: 2022-04-29

Publish Date: 2022-10-31

Abstract

Abstract

Amine CO₂ capture is an effective post-combustion carbon capture (PCC) technology, while CO₂ mineral carbonation is a safe and stable method for CO₂ storage. In this paper, these two methods were combined, and the CO₂ absorption-mineralization performance of mixed amine solution coupled with CaO under different ratios of mixed amine solution, temperature, reaction time and CaO addition ratio were studied by using MEA/MDEA mixed amine solution as the CO₂ absorbent and using CaO as the CO₂ mineralizing raw material. The results show that CaO could effectively mineralize the CO₂ absorbed in MEA/MDEA solution, realizing the regeneration of MEA/MDEA solution simultaneously under normal temperature and pressure. Meanwhile, the MEA/MDEA solution can still maintain a high CO₂ conversion rate (77.4%) and CO₂ cycle loading (1.03 mol/L) after five cycles of absorption-mineralization experiments. The FT-IR and XRD analyses reveal that the addition of CaO makes a large amount of Ca²⁺ and OH^- into the MEA/MDEA solution, which could react with CO$_3^{2{\rm{ - }}} $/HCO$_3^{\rm{ - }} $ and protonated amine in the solution to form calcium carbonate precipitate and free amine respectively, thus realizing the mineralization of CO₂ and the regeneration of MEA/MDEA solution. The main component of solid products obtained is calcium carbonate, and calcite is its main crystal form.
- CO₂,
- mixed amine,
- mineral carbonation,
- chemical regeneration,
- calcium carbonate

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References(24)

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