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首页> 外文期刊>Environmental Science & Technology >Kinetics, Thermodynamics, and Mechanism of a Novel Biphasic Solvent for CO_2 Capture from Flue Gas
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Kinetics, Thermodynamics, and Mechanism of a Novel Biphasic Solvent for CO_2 Capture from Flue Gas

机译：新型双相溶剂从烟气中捕集CO_2的动力学，热力学和机理

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The main issue related to the deployment of the amine-based absorption process for CO_(2) capture from flue gas is its intensive energy penalty. Therefore, this study screened a novel biphasic solvent, comprising a primary amine e.g., triethylenetetramine (TETA) and a tertiary amine e.g., N , N -dimethylcyclohexylamine (DMCA), to reduce the energy consumption. The TETA-DMCA blend exhibited high cyclic capacity of CO_(2) absorption, favorable phase separation behavior, and low regeneration heat. Kinetic analysis showed that the gas- and liquid-side mass transfer resistances were comparable in the lean solution of TETA-DMCA at 40 °C, whereas the liquid-side mass transfer resistance became dominant in the rich solution. The rate of CO_(2) absorption into TETA-DMCA (4 M, 1:3) solution was comparable to 5 M benchmark monoethanolamine (MEA) solution. Based on a preliminary estimation, the regeneration heat with TETA-DMCA could be reduced by approximately 40% compared with that of MEA. ~(13)C NMR analysis revealed that the CO_(2) absorption into TETA-DMCA was initiated by the reaction between CO_(2) and TETA via the zwitterion mechanism, and DMCA served as a CO_(2) sinker to regenerate TETA, resulting in the transfer of DMCA from the upper to lower phase. The proposed TETA-DMCA solvent may be a suitable candidate for CO_(2) capture.
机译：与从烟气中捕获CO_（2）的胺基吸收过程的部署有关的主要问题是其密集的能量损失。因此，这项研究筛选了一种新型的双相溶剂，以减少能耗，该溶剂包括伯胺，例如三亚乙基四胺（TETA）和叔胺，例如N，N-二甲基环己胺（DMCA）。 TETA-DMCA共混物表现出高的CO_（2）吸收循环能力，良好的相分离行为和较低的再生热。动力学分析表明，在40°C的TETA-DMCA稀溶液中，气体和液体侧的传质阻力相当，而在浓溶液中，液体和侧的传质阻力占主导地位。 CO_（2）吸收到TETA-DMCA（4 M，1：3）溶液中的速率与5 M基准单乙醇胺（MEA）溶液相当。根据初步估计，与MEA相比，TETA-DMCA的再生热量可降低约40％。 〜（13）C NMR分析表明，CO_（2）吸收到TETA-DMCA中是通过两性离子机理引起的CO_（2）与TETA之间的反应而引发的，而DMCA则充当了CO_（2）沉降池来再生TETA，导致数字千年版权法案（DMCA）从上阶段转移到下阶段。提出的TETA-DMCA溶剂可能是CO_（2）捕获的合适候选者。

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  • 来源
    《Environmental Science & Technology》 |2018年第6期|3660-3668|共9页
  • 作者

    Shihan Zhang; Yao Shen; Peijing Shao; Jianmeng Chen; Lidong Wang;

  • 作者单位

    College of Environment, Zhejiang University of Technology, Hangzhou 310014, China;

    College of Environment, Zhejiang University of Technology, Hangzhou 310014, China;

    College of Environment, Zhejiang University of Technology, Hangzhou 310014, China;

    College of Environment, Zhejiang University of Technology, Hangzhou 310014, China;

    School of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China;

  • 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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