Guanidine-based Deep Eutectic Solvents in CO2 capture process

ARATA BADANO, J.; GOMEZ, F. J. V.; URANGA, J. G.

Venice

Otro; 15th Green Chemistry Postgraduate Summer School; 2023

Green Sciences For Sustainable Development Foundation

Extensive research has been conducted on carbon dioxide (CO2) capture, utilization, and storage (CCUS) to address climate change. Among the various methods explored, physical and chemical absorption in liquids have emerged as the preferred options due to their operational simplicity.[1] Previous studies have shown the effectiveness of amines as liquid absorbents for CO2 capture. However, the use of amines presents several drawbacks, including high volatility, degradation at higher temperatures, energy-intensive solvent regeneration, corrosiveness, and toxicity.[2] Deep Eutectic Solvents (DESs) have attracted considerable attention due to their interesting properties, such as low volatility, task specificity, and high thermal and chemical stability. DESs are formed through hydrogen bond interactions between hydrogen bond donors (HBDs) and acceptors (HBAs) and offer significant advantages such as easy preparation, low cost, and tunable structures.[3]In the present study, different DES have been prepared by mixing guanidine hydrochloride (GuaHCl) as HBA with different HBDs such as ethylene glycol (EG), propylene glycol (PG), 1,3-propanediol (1,3-PDOH), polyethylene glycol 400 (PEG400), glycerol (Gly) and buthylamine (ButNH2). The CO2 capture capacity was measured gravimetrically at 25 °C and at 10 bar. Physical and chemical absorption were identified by FT-IR spectroscopy and complemented with 1H NMR measurements.