碳捕获利用和封存目前已经成为一种重要的节能减排和低碳环保技术。化学吸收法是常用的CO2捕获技术，其中吸收剂的选取至关重要。为降低CO2吸收和解吸的能耗，学术界需对现有主流乙醇胺吸收剂进行优化。三级胺混合乙醇胺溶液可有效降低能耗，渐成溶液优化的常用良法。学术界对低能耗吸收溶液的制备和选取，缺乏清晰的理论依据和普适规律。为解决此问题，本项目立足基础回归溶液化学，对几类典型混合胺溶液: MDEA, TEA, AMP/MEA 进行分析。重点关注溶液的化学平衡反应，以溶液CO2解吸曲线为基础，离子浓度图为脉络，碳酸氢根浓度变化趋势为核心，深入研究[HCO3-]对混合溶液的CO2解吸过程的影响和作用机理。通过研究混合胺溶液解吸曲线快速/慢速的转折点与[HCO3-]消失/出现的临界点的关系，达到扩大解吸区间并显著降低解吸能耗的效果。如本项目顺利开展，将为制备新型低能耗CO2吸收剂提供经验规律和理论依据。

Carbon Capture Utilization and Storage(CCUS) has been widely recognized as the important technology in the research field of energy conservation and emission reduction and low carbon emission. CO2 absorption with reactive chemicals has been the widely used carbon capture techniques, and a large number of researches were required to improve and modify the current MEA based CO2 absorbent. The tertiary amine blended with MEA can reduce the energy cost effectively, which has been a common method in the research area of interest. Some peer researchers usually perform the regeneration tests, and screen out the better solution as candidate. However, such tests are costly and time-consuming without any clear clues or regulations. Therefore, this research project was rooted on elementary science, to focus on the chemical reactions within several blended amine solutions systems such as MEA-(MDEA-TEA-AMP)-CO2-H2O. The amine regeneration curves were plotted, and the ion speciation plots were generated. The bicarbonate was carefully studied as the key component, to investigate the mechanism of bicarbonate toward the CO2 regeneration process. This research aimed to determine whether the “turning point” of the amine regeneration curve is the “critical point” of bicarbonate start to be detectable in the amine solution. The reactions mechanisms of conversion of carbamate, bicarbonate and carbonate are also studied as well. These results, proof and clues can facilitate the preparation of other novel low heat-duty amine solution.