Jun Hui Law, Aisyah Ilyani Ismail, Graham Leverick, Elizabeth M. Bernhardt, Azlan Mohd. Kassim, Farihahusnah Hussin, Betar M. Gallant, Mohamed Kheireddine Aroua
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Abstract
The coupling process of carbon capture and utilization technology (CCU) that is gaining a lot of interest is called integrated CO2 capture–conversion (ICCC) where it is a part of the technological advancement aligning to one of the Sustainable Development Goals (SDGs) domains, which is SDG 13 (climate action). It electrochemically transforms CO2 extracted from the post-combustion emissions into valuable products using amine-electrolyte solution, eliminating the need for an energy-intensive sorbent regeneration step. Extensive work on the chemical equilibria of the solvent combination is crucial to reveal the effect of salt addition towards the absorption mechanism. In this work, the chemical equilibria of the amine-electrolyte solvent systems are modeled using the Deshmukh–Mather model. The binary interaction parameters used in the modeling are fitted using experimental data, and the fitted model showed the average absolute deviation less than 10% for all the amine-electrolyte solvent systems, which showed better results than the extended Debye–Hückel model. The modeled speciation was compared using the protonated amine, bicarbonate, and carbamate concentration as a function of the solution pH. The concentration of carbamate showed a peak at a pH approximately equal to the protonation constant of the amines. The carbamate produced in the potassium chloride-containing solutions was approximately following the stoichiometry of the reaction. Moreover, potassium bicarbonate can be treated as the reactive electrolyte for higher production of carbamate during the absorption process. Overall, this article emphasizes the speciation modeling that can be used as the foundation for other possible blends of absorbents. © 2025 Society of Chemical Industry and John Wiley & Sons, Ltd.
氨基-电解质水溶液吸收CO2的热力学模型
碳捕获与利用技术(CCU)的耦合过程受到广泛关注,被称为综合二氧化碳捕获转换(ICCC),它是与可持续发展目标(SDG)领域之一SDG 13(气候行动)相一致的技术进步的一部分。它使用胺电解质溶液将燃烧后排放的二氧化碳转化为有价值的产品,从而消除了能源密集型吸附剂再生步骤的需要。对溶剂组合化学平衡的深入研究对于揭示盐的加入对吸收机理的影响是至关重要的。在这项工作中,使用Deshmukh-Mather模型模拟了胺-电解质溶剂系统的化学平衡。利用实验数据对模型中二元相互作用参数进行拟合,拟合模型的平均绝对偏差均小于10%,优于扩展的debye - h ckel模型。用质子化胺、碳酸氢盐和氨基甲酸酯浓度作为溶液pH的函数来比较模型的物种形成。氨基甲酸酯浓度在pH近似等于胺的质子化常数时出现峰值。在含氯化钾溶液中产生的氨基甲酸酯大致符合反应的化学计量。此外,在吸收过程中,碳酸氢钾可以作为活性电解质,以提高氨基甲酸酯的产量。总的来说,本文强调了物种形成模型,它可以作为其他可能的吸收剂共混的基础。©2025化学工业协会和John Wiley &;儿子,有限公司
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