Electrochemically mediated amine regeneration (EMAR) was recently developed to avoid the use of thermal means to release CO₂ 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 aminoethylethanolamine (AEEA) was investigated. The properties of the mixed amine systems, including the absorption rates, electrolyte pH and conductivity, and CO₂ 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% CO₂, 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 CO₂ capture from flue gas and other sources.

中文翻译：

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具有混合吸收剂的电化学介导的胺再生过程，用于燃烧后二氧化碳捕集。

最近开发了电化学介导的胺再生（EMAR），以避免在基准胺法中使用热手段释放从燃烧后烟道气中捕获的CO ₂。为了解决与乙二胺（EDA）作为EMAR中使用的伯胺的高蒸气压有关的问题，研究了EDA和氨基乙基乙醇胺（AEEA）的混合物。混合胺系统的特性，包括吸收率，电解质的pH和电导率以及CO ₂与单独使用EDA的能力进行了评估。混合胺体系与EDA具有相似的特性，这表明与仅使用EDA相比，使用混合胺的EMAR工艺的未来实施无需进行任何重大更改。还研究了混合胺在电池电压，气体脱附速率，电子利用和高能方面的电化学性能。EDA和AEEA的50/50混合物显示出最低的能量：比100％EDA低约10％。使用这种混合物，在100小时内测试了一个连续的EMAR过程，其中吸收塔连接到电化学电池作为解吸阶段。电池电压非常稳定，并且稳定的气体输出接近理论值。_{如图2所示}，确认没有胺蒸发。还使用滴定和核磁共振（NMR）光谱对混合的吸收性组合物进行表征，结果表明没有胺降解。这些发现证明了稳定的，低蒸气压的吸收剂以及改进的能量学特性是有希望的，并且可以作为EMAR未来发展的指南，以从烟气和其他来源捕获CO ₂。