In this work, Diethanolamine (DEA) was considered as an activator to enhance the CO₂ capture performance of Monoethanolamine (MEA). The addition of DEA into MEA system was expected to improve disadvantages of MEA on regeneration heat, degradation, and corrosivity. To understand the reaction mechanism of blended MEA‐DEA solvent and CO₂, ¹³C nuclear magnetic resonance (NMR) technique was used to study the ions (MEACOO^‐, DEACOO^–, MEA, DEA, MEAH⁺, DEAH⁺, , ) speciation in the blended MEA‐DEA‐CO₂‐H₂O systems with CO₂ loading range from 0 to 0.7 mol CO₂/mol amine at the temperature of 301 K. The different ratios of MEA and DEA (MEA: DEA = 2.0:0, 1.5:0.5, 1.0:1.0, and 0:2.0) were studied to comprehensively investigate the role of DEA in the system of MEA‐DEA‐CO₂‐H₂O. The results revealed that DEA performs the coordinative role at the low CO₂ loading and the competitive role at high CO₂ loading. Additionally, the mechanism was also proposed to interpret the reaction process of the blended solvent with CO₂. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2515–2525, 2018

中文翻译：

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DEA作为MEA水溶液活化剂用于燃烧后CO2捕集的研究机理

在这项工作中，二乙醇胺（DEA）被认为是一种增强单乙醇胺（MEA）的CO ₂捕集性能的活化剂。预期在MEA系统中添加DEA可以改善MEA在再生热，降解和腐蚀性方面的缺点。为了理解混合MEA-DEA溶剂和CO的反应机理₂，¹³ C核磁共振（NMR）技术被用于研究离子（MEACOO ^-，DEACOO ^-，MEA，DEA，MEAH ⁺，DEAH ⁺， ，）形态在混合MEA‐DEA‐CO ₂ ‐ H ₂ O系统中，CO _2的负载范围为0至0.7 mol CO₂ / mol胺，温度为301K。研究了MEA与DEA的不同比例（MEA：DEA = 2.0：0、1.5：0.5、1.0：1.0和0：2.0），以全面研究DEA在其中的作用。的MEA-DEA-CO系统₂ -H ₂ O.结果表明，DEA执行在低的CO的协调作用₂加载和竞争作用在高CO ₂加载。此外，还提出了解释混合溶剂与CO ₂的反应过程的机理。©2018美国化学工程师学会AIChE J，64：2515–2525，2018