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首页> 外文期刊>Environmental Science & Technology >An Electrochemically Mediated Amine Regeneration Process with a Mixed Absorbent for Postcombustion CO_2 Capture
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An Electrochemically Mediated Amine Regeneration Process with a Mixed Absorbent for Postcombustion CO_2 Capture

机译：电化学介导的胺再生方法，具有混合吸收剂，用于后COMSTION CO_2捕获

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摘要

Electrochemically mediated amine regeneration (EMAR) was recently developed to avoid the use of thermal means to release CO_2 captured from postcombustion flue gas in the benchmark amine process. To address concerns related to the high vapor pressure of ethylenediamine (EDA) as the primary amine used in EMAR, a mixture of EDA and aminoethylethanol- amine (AEEA) was investigated. The properties of the mixed amine systems, including the absorption rates, electrolyte pH and conductivity, and CO_2 capacity, were evaluated in comparison with those of solely EDA. The mixed amine system had similar properties to that of EDA, indicating no significant changes would be necessary for the future implementation of the EMAR process with mixed amines as opposed to that with just EDA The electrochemical performance of the mixed amines in terms of the cell voltage, gas desorption rate, electron utilization, and energetics was also investigated. A 50/50 mixture of EDA and AEEA displayed the lowest energetics: ～10% lower than that of 100% EDA. With this mixture, a continuous EMAR process, in which the absorption column was connected to the electrochemical cell as the desorption stage, was tested over 100 h. The cell voltage was very stable and there was a steady gas output close to theoretical values. The desorbed gas was further analyzed and found to be 100% CO_2, confirming no evaporation of the amine. The mixed absorbent composition was also characterized using titration and nuclear magnetic resonance (NMR) spectroscopy, and the results showed no amine degradation. These findings that demonstrate a stable, low vapor pressure absorbent with improved energetics are promising and could be a guideline for the future development of EMAR for CO_2 capture from flue gas and other sources.
机译：最近开发了电化学介导的胺再生（EMAR）以避免使用热意味着在基准胺过程中从后切割烟道气中捕获的CO_2释放。为了应对与EMAR中使用的伯胺的乙二胺（EDA）的高蒸气压相关的担忧，研究了EDA和氨基乙基氨基（AEEA）的混合物。与单独EDA的那些相比，评价混合胺系统的性质，包括吸收率，电解质pH和导电性，以及CO_2容量。混合胺系统对EDA的性质具有类似的性质，表明未来对混合胺的EMAR过程的未来实施不具有显着变化，而不是在电池电压方面的混合胺的电化学性能而导致。还研究了天然气解吸速率，电子利用率和能量。 50/50的EDA和AEEA混合物显示出最低的能量：〜10％低于100％EDA。用这种混合物，在100小时内测试连续的EMAL工艺，其中吸收塔将其连接到电化学电池。电池电压非常稳定，并且稳定的气体输出接近理论值。进一步分析解吸气体并发现100％CO_2，证实胺蒸发。混合吸收剂组合物的特征在于使用滴定和核磁共振（NMR）光谱，结果表明没有胺降解。这些调查结果表明具有改进的能量学的稳定，低蒸气压力吸收性是有前途的，并且可以成为从烟气和其他来源捕获CO_2捕获的EMAR的未来发展的指导。

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  • 来源
    《Environmental Science & Technology》 |2020年第14期|8999-9007|共9页
  • 作者

    Mohammad Rahimi; Kyle M. Diederichsen; Nil Ozbek; Miao Wang; Wonyoung Choi; T. Alan Hatton;

  • 作者单位

    Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts 02139 United States;

    Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts 02139 United States;

    Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts 02139 United States;

    Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts 02139 United States;

    IHI Corporation Koto-ku Tokyo 135- 8710 Japan;

    Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts 02139 United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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