2.3 Synthesis of multimer absorbents
Multimer absorbent (DBU-2EG) was synthesized by a one-step mixing. DBU (1 mol) and EG (2 mol) were instilled into a stirred tank reactor (STR) equipped with a magnetic stirrer and containing DMSO with a mass concentration of 35%. The mixing lasted for 2 h at room temperature.
The preparation methods of DBU-EG multimer absorbent was similar to DBU-2EG.