Diamines or polyamines with two or more amino groups are suitable for formulating non-aqueous absorbents (NAAs) with high CO2 loading capacity and low regeneration energy consumption. However, these two types of amines in NAAs are prone to produce insoluble gelatinous products after absorbing CO2, resulting in difficult operation of the CO2 capture system. In this study, by using 2-amino-2-methyl-1-propanol (AMP) as an inhibitor, the insoluble gelatinous products of the aminoethylethanolamine (AEEA)-N-methyl-2-pyrrolidone (NMP) (A-A-N) and 3-(methylamino)propylamine (MAPA)-NMP (M-A-N) NAAs were successfully eliminated. The experimental results showed that the AMP-regulated NAAs possessed a high absorption rate, high CO2 loading capacity, excellent desorption efficiency, and stable recyclability. The reaction mechanism of CO2 absorption and the inhibitory mechanism of AMP on the formation of gelatinous products were comprehensively elucidated. Taking the A-A-N system as a representative, AEEA reacted with CO2 to form zwitterionic protonated carbamate species (AEEACO2−(P)H+(S)), which tended to self-aggregate via hydrogen-bond interaction, resulting in the formation of insoluble gelatinous products. With the introduction of AMP, the AMP-derived products could combine easily with AEEACO2−(P)H+(S) via strong electrostatic attraction to form ion pairs, preventing the AEEACO2−(P)H+(S) molecules from self-aggregating to form insoluble gelatinous products. The regeneration heat duty of the A-A-N system was 1.89 GJ∙ton−1 CO2, which was 49.9 % lower than that of the benchmark 30 wt% MEA. Overall, introducing AMP as a gelatinous product inhibitor was beneficial for the development of NNAs with high CO2 absorption capacity and low-energy consumption.

中文翻译：

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2-氨基-2-甲基-1-丙醇对非水 CO2 吸收剂中凝胶状产物形成的抑制作用：实验研究和分子理解


具有两个或多个氨基的二胺或多胺适合配制具有高CO2负载能力和低再生能耗的非水吸收剂（NAA）。然而，NAA中的这两类胺在吸收CO2后容易产生不溶性凝胶状产物，导致CO2捕集系统运行困难。在本研究中，通过使用2-氨基-2-甲基-1-丙醇（AMP）作为抑制剂，氨基乙基乙醇胺（AEEA）-N-甲基-2-吡咯烷酮（NMP）（AAN）和3的不溶性凝胶状产物-(甲基氨基)丙胺 (MAPA)-NMP (MAN) NAA 已成功消除。实验结果表明，AMP调节的NAAs具有高吸收率、高CO2负载能力、优异的解吸效率和稳定的可回收性。全面阐明了CO2吸收的反应机理和AMP对凝胶状产物形成的抑制机理。以AAN体系为代表，AEEA与CO2反应形成两性离子质子化氨基甲酸酯物种(AEEACO2−(P)H+(S))，通过氢键相互作用倾向于自聚集，从而形成不溶性凝胶状产物。随着AMP的引入，AMP衍生产物可以通过强静电引力与AEEACO2−(P)H+(S)轻松结合形成离子对，从而防止AEEACO2−(P)H+(S)分子自聚集形成不溶性凝胶状产物。 AAN 系统的再生热负荷为 1.89 GJ∙ton−1 CO2，比基准 30 wt% MEA 低 49.9%。总体而言，引入AMP作为凝胶状产物抑制剂有利于开发具有高CO2吸收能力和低能耗的NNAs。