Highlights:
1. DBU-2EG multimer absorbent with double H-bonds was designed by
intermolecular self-assembly using DBU and EG for the first time.
2. The concentrated electron density around O in EG of DBU-2EG caused
the formation of H-bonds between DBU-2EG and H2S,
favoring the absorption of H2S.
3. A method for developing high-efficiency physical absorbent for
H2S was constructed by designing H-bond in an absorbent
molecule.
4. DBU-2EG multimer absorbent has a physical absorption solubility of
2.64 mol/mol (DBU) (25 oC, 1 atm) for
H2S.