## 1 Introduction  
Global warming is a critical issue in the world. Because of this, the Paris Agreement declared that the global mean temperature increment must not exceed 2 \({}^{\circ}\)C by 2100, and aims to reduce the temperature to 1.5 \({}^{\circ}\)C. This shows that the reduction of greenhouse gas is more pressing [1; 2; 3]. Fossil fuels are the most significant factors in the warming process, and the energy, petrochemical, steel, transportation, and cement industries are the major contributors. Electricity is mainly derived from thermal power plants, and the thermal power plants burn fossil fuels, where CO\({}_{2}\) is the main source of the greenhouse effect. Nowadays, there are three common systems for capturing CO\({}_{2}\), including post-combustion, pre-combustion, and oxyfuel-combustion. In a post-combustion system, the CO\({}_{2}\) concentration is 3-15% [4], which is mostly removed by chemical absorption. The common solvents for chemical solvent absorption processes include amines, NaOH, aqueous ammonia, ionic liquids, hot potassium carbonate, and amino acid salt. Among these solvents, the amine is studied a lot. Monoethanolamine (MEA) is universally used as an absorbent by over a thousand commercial plants, because it has a high absorption rate, high alkalinity, regenerability, and low price, but the it also has low loading, deterioration, high corrosively, and a high regenerated energy [3]. In order to improve the absorption and stripping efficiency, it is imperative to find new, more efficient solvents, such as methyldiethanolamine (MDEA), diethanolamine (DEA), diethylenetriamie (DETA), piperazine (PZ), ionic liquids, and blended amines [5; 6; 7; 8; 9; 10; 11]. Compared with MEA, it has been found that regeneration energy can be largely reduced for both single amines and blended amines [9; 12]. Industrially, the chemical solvent absorption process is used for capturing CO\({}_{2}\). The CO\({}_{2}\) absorption and stripping double unit operating system is usually used [13; 14; 15; 16; 17]. The cost of the CO\({}_{2}\) post-combustion capture would increase the cost of electricity production by 70%. Therefore, improving the efficiency of absorbent, environmental factors and regeneration efficiency are the key points of subsequent studies [15; 16; 17]. This includes operating range and loading control for scrubber and reboiler temperature and flow rate for stripper. Therefore, the studies using amino acid salt as an absorbent have been noted by scholars. In order to improve on the drawback of alkanolamines, including their oxidative degredation and high vapor pressure resulting in solvent loss and degradation product handling, many alternative solvents have been tested [3; 6; 7; 8; 9; 10; 11; 18; 19; 20; 21; 22], in which amino acid salts are found to be more attractive solvents. This is because amino acid salt solutions have a better resistance to degradation, have a negligible volatility, and no environmental issue [23]. Because of this, using amino acid salt solutions as solvents capturing CO\({}_{2}\) have been carried out in various modes; [PERSON] et al. [24], [PERSON] et al. [25], [PERSON] et al. [26], [PERSON] et al. [18], and [PERSON] et al. [21] have all studied the absorption kinetics of CO\({}_{2}\) using aqueous amino acid salts, while the thermodynamic properties of amino acid salt solutions have been explored by [PERSON] et al. [27], [PERSON] et al. [28], [PERSON] et al. [29], and [PERSON] et al. [30]. Amino acid salt has the aforesaid characteristics, but there will be precipitates in some concentration conditions, blocking the absorption plant pipeline. Therefore, the concentration must be controlled when the amino acid salt is used to capture CO\({}_{2}\).