Carbon dioxide absorption and desorption experiments based on MDEA

The global climate change problem has brought much attention to CO₂ capture technology. N-methyldiethanolamine (MDEA), as an efficient and environmentally friendly absorbent, is widely used in CO₂ capture. However, it is difficult for a single MDEA to meet the demand for efficient absorption and desorption under certain conditions, so the addition of promoters to improve its performance has become a hot research topic. The aim of this study is to deeply investigate the effects of different accelerators on the absorption and desorption of CO₂ by MDEA. Experiments were conducted to measure the absorption capacity of the MDEA compound solution for CO₂ in a bubbling reactor at 30°C and to evaluate its desorption effect in a desorption system at 90°C. The experimental results showed that increasing the promoter concentration in the MDEA-based absorbent solution significantly enhanced the absorption capacity and circulation capacity. However, in terms of desorption efficiency, the added concentrations of MEA and DEA were negatively correlated with the desorption efficiency. Notably, the addition of 0.1 mol/L DEA significantly enhanced the desorption efficiency by 16% compared with MDEA.