Wen Shuyue, Zhang Xiaomin, Wu Youting
Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China.
The Institute of Green Chemistry and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Suzhou, Jiangsu, 215163, China.
Chem Asian J. 2024 Jun 3;19(11):e202400234. doi: 10.1002/asia.202400234. Epub 2024 Apr 27.
Carbon capture, utilization, and storage (CCUS) are among the key technologies to achieve large-scale carbon emission reduction globally. Deep eutectic solvents (DESs) are considered as designable solvents, which has attracted intensive attention for CO capture. Here, a series of binary DESs are synthesized through one-step mixing with the starting materials of protic ionic liquid (PIL) and amine. The eutectic behavior was investigated by measuring the melting point of PILs and amine. The saturated vapor of these DESs and industrial MDEA solution were measured and compared. These DESs are investigated to have high absorption capacity (0.1 g ⋅ g at 1.0 bar and 25 °C), superior apparent absorption rate constant (0.381 min vs 0.012 min of 70 wt.% MDEA), moderate interaction with CO (the enthalpy change is as low as -34.8 kJ ⋅ mol). The absorption mechanism is also investigated by NMR analysis. Eight absorption/desorption regeneration experiments are carried out to show their reversibility. Considering the advantages, including convenience of synthesis, large absorption capacity, fast absorption rate, and moderate interaction energy as well as good regeneration, these DESs are believed to be as potential CO absorbent in practical applications.
碳捕获、利用与封存（CCUS）是全球实现大规模碳排放减少的关键技术之一。深共熔溶剂（DESs）被认为是可设计的溶剂，在CO₂捕获方面引起了广泛关注。在此，通过将质子离子液体（PIL）和胺的起始原料一步混合合成了一系列二元DESs。通过测量PILs和胺的熔点研究了共晶行为。测量并比较了这些DESs和工业MDEA溶液的饱和蒸汽。研究发现这些DESs具有高吸收容量（在1.0 bar和25 °C下为0.1 g ⋅ g⁻¹）、优异的表观吸收速率常数（0.381 min⁻¹，而70 wt.% MDEA为0.012 min⁻¹）、与CO₂的适度相互作用（焓变低至-34.8 kJ ⋅ mol⁻¹）。还通过核磁共振分析研究了吸收机理。进行了八次吸收/解吸再生实验以展示其可逆性。考虑到合成方便、吸收容量大、吸收速率快、相互作用能适度以及良好的再生等优点，这些DESs被认为在实际应用中是潜在的CO₂吸收剂。
