Reactive regeneration in novel hybrid solvent: Achieving dual objectives of H2S conversion and absorbent regeneration.

[Display omitted] • [TND-C][Tf 2 N]/DFP exhibits the H 2 S uptake of 3.65 mol/mol at 30 °C and 1 bar. • [TND-C][Tf 2 N]/DFP exhibits good selectivity for H 2 S/CO 2 (25) and H 2 S/CH 4 (8 3 6). • The yield of thiols reaches 99 % within 30 min under mild conditions. • The reaction regeneration of the absorbent is carried out at room temperature. • Reaction regeneration strategy eliminates high energy losses during desorption of H 2 S. In this work, we developed a composite solution (FILs/DFP) using ionic liquids (FILs) and 4-formylmorpholine (DFP) for natural gas desulfurization. Among these, [TND-C][Tf 2 N]/DFP exhibited an impressive H 2 S uptake of 3.65 mol/mol and H 2 S/CO 2 selectivity of 25 at 30 °C and 1 bar. The 1H NMR, FTIR, and DFT calculations revealed that the dense hydrogen bonding network and the active sites of tertiary amines in FILs/DFP were the main factors for the efficient uptake of H 2 S. Furthermore, we propose a viable reaction regeneration strategy at room temperature, successfully addressing the challenges of absorber regeneration, the catalytic activity of the FILs remained above 95 % even after six cycles. Overall, this strategy eliminates the high energy losses of H 2 S desorption and allows for the recycling of FILs with minimal energy consumption. This simultaneously achieving dual objectives of H 2 S conversion and absorbent regeneration process shows promising applications in natural gas desulphurization. [ABSTRACT FROM AUTHOR]