Low–energy–consuming CO2 capture by liquid–liquid biphasic absorbents of EMEA/DEEA/PX
[Display omitted] •PX was used as phase splitter for non-aqueous EMEA/DEEA absorbent.•The phase-change mechanisms of EMEA/DEEA/PX were elucidated.•CO2-desorption rate of EMEA/DEEA/PX doubled compared with that of EMEA/DEEA.•The regeneration energy of EMEA/DEEA/PX was 31% lower than that of EMEA/DEEA...
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Published in | Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 450; p. 138490 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
15.12.2022
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Abstract | [Display omitted]
•PX was used as phase splitter for non-aqueous EMEA/DEEA absorbent.•The phase-change mechanisms of EMEA/DEEA/PX were elucidated.•CO2-desorption rate of EMEA/DEEA/PX doubled compared with that of EMEA/DEEA.•The regeneration energy of EMEA/DEEA/PX was 31% lower than that of EMEA/DEEA.
Non-aqueous biphasic solvents, which combine the advantages of a non-aqueous absorbent and biphasic absorbent, have attracted increasing attention for CO2 capture because of their great potential to reduce the energy consumption. This study proposed a non-aqueous N-ethylethanolamine (EMEA)/N,N-diethylethanolamine (DEEA)-based liquid–liquid biphasic absorbent with p-xylene (PX) to replace 45–65 % of DEEA. The biphasic absorbent comprising 30 wt% EMEA + 5 wt% DEEA + 65 wt% PX (30E5D65P) had the best phase-change behaviour. In this absorbent, 98.8 % of the absorbed CO2 was in the lower phase of the solvent, with a volume percentage of 35.1 %. This absorbent also showed the best CO2-desorption performance, with almost double the CO2-desorption amount and maximum CO2-desorption rate compared with those achieved using the 30 wt% EMEA + 70 wt% DEEA (30E70D) non-aqueous absorbent. The regeneration energy of 30E5D65P was 1.71 GJ∙t−1 CO2, which was reduced by 31 % and 55 % compared with that of the non-aqueous 30E70D absorbent and the aqueous 30 wt% monoethanolamine absorbent, respectively. 13C NMR analysis and quantum chemical calculations showed that carbamate and PX have a better separation effect than that of EMEA and DEEA, owing to the presence of both polarity and hydrogen bonding. PX with low polarity was beneficial for the separation of carbamate. The carbamate interacted with (protonated) EMEA, (protonated) DEEA and carbamic acid through hydrogen bonds, resulting in the appearance of these components in the lower phase. The carbamate had no hydrogen bond self-aggregation, which may be the reason why there was no crystal precipitation. |
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AbstractList | [Display omitted]
•PX was used as phase splitter for non-aqueous EMEA/DEEA absorbent.•The phase-change mechanisms of EMEA/DEEA/PX were elucidated.•CO2-desorption rate of EMEA/DEEA/PX doubled compared with that of EMEA/DEEA.•The regeneration energy of EMEA/DEEA/PX was 31% lower than that of EMEA/DEEA.
Non-aqueous biphasic solvents, which combine the advantages of a non-aqueous absorbent and biphasic absorbent, have attracted increasing attention for CO2 capture because of their great potential to reduce the energy consumption. This study proposed a non-aqueous N-ethylethanolamine (EMEA)/N,N-diethylethanolamine (DEEA)-based liquid–liquid biphasic absorbent with p-xylene (PX) to replace 45–65 % of DEEA. The biphasic absorbent comprising 30 wt% EMEA + 5 wt% DEEA + 65 wt% PX (30E5D65P) had the best phase-change behaviour. In this absorbent, 98.8 % of the absorbed CO2 was in the lower phase of the solvent, with a volume percentage of 35.1 %. This absorbent also showed the best CO2-desorption performance, with almost double the CO2-desorption amount and maximum CO2-desorption rate compared with those achieved using the 30 wt% EMEA + 70 wt% DEEA (30E70D) non-aqueous absorbent. The regeneration energy of 30E5D65P was 1.71 GJ∙t−1 CO2, which was reduced by 31 % and 55 % compared with that of the non-aqueous 30E70D absorbent and the aqueous 30 wt% monoethanolamine absorbent, respectively. 13C NMR analysis and quantum chemical calculations showed that carbamate and PX have a better separation effect than that of EMEA and DEEA, owing to the presence of both polarity and hydrogen bonding. PX with low polarity was beneficial for the separation of carbamate. The carbamate interacted with (protonated) EMEA, (protonated) DEEA and carbamic acid through hydrogen bonds, resulting in the appearance of these components in the lower phase. The carbamate had no hydrogen bond self-aggregation, which may be the reason why there was no crystal precipitation. |
ArticleNumber | 138490 |
Author | Lu, Shijian Jia, Chunxiao Bai, Liju Jiang, Yingjie Zhao, Qizheng Chen, Linlin Chen, Siming |
Author_xml | – sequence: 1 givenname: Liju surname: Bai fullname: Bai, Liju organization: School of Environmental Science and Engineering, Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao, Qingdao University, Qingdao, Shandong 266075, China – sequence: 2 givenname: Shijian surname: Lu fullname: Lu, Shijian organization: Institute of Carbon Neutralization, School of Chemical Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China – sequence: 3 givenname: Qizheng orcidid: 0000-0002-5369-0522 surname: Zhao fullname: Zhao, Qizheng organization: School of Environmental Science and Engineering, Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao, Qingdao University, Qingdao, Shandong 266075, China – sequence: 4 givenname: Linlin surname: Chen fullname: Chen, Linlin organization: School of Environmental Science and Engineering, Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao, Qingdao University, Qingdao, Shandong 266075, China – sequence: 5 givenname: Yingjie surname: Jiang fullname: Jiang, Yingjie organization: State Key Laboratory for Turbulence and Complex System, Department of Mechanics and Engineering Science, School of Engineering, Peking University, Beijing 100871, China – sequence: 6 givenname: Chunxiao surname: Jia fullname: Jia, Chunxiao organization: School of Chemistry and Chemical Engineering, Dezhou University, Dezhou, Shandong 253025, China – sequence: 7 givenname: Siming surname: Chen fullname: Chen, Siming email: chsiming@qdu.edu.cn, chsiming@126.com, chsiming@qdu.edu.cn organization: School of Environmental Science and Engineering, Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao, Qingdao University, Qingdao, Shandong 266075, China |
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