Investigation of Amine-Based Ternary Deep Eutectic Solvents for Efficient, Rapid, and Reversible SO₂ Absorption

Abstract

Effective and reversible absorption of sulfur dioxide (SO 2 ) with commercially available and easily prepared absorbents now has drawn increasing concentration. In this work, a series of amine-based ternary deep eutectic solvents (DESs) composed of diethylenetriamine (DETA), acetamide (AA), and ethylene glycol (EG) were prepared to study the SO 2 absorption performance. Results demonstrate that these obtained ternary DESs not only exhibit a rapid absorption rate but also present desirable absorption capacity and cycling performance. Mass capacity of 0.82 g of SO 2 /g of DES would be received with DETA/AA/EG (1:1:2) ternary DES, which could be ascribed to the Lewis acid− base interaction and hydrogen bonding between alkaline ternary DES and acidic SO 2 . This work would provide a novel route to prepare ideal absorbents for effective SO 2 capture.

Homologue-paired liquids as special non-ionic deep eutectic solvents for efficient absorption of SO2

“…This may be due to the higher charge density of NMP over 2-pyr, or the higher alkalinity of Eim over Im, which leads to the stronger interaction with SO 2 . 18 Nevertheless, the HBD component (2-pyr or Im) also has good SO 2 absorption capacity to pair with its HBA homologue (NMP or Eim), so that the HPL can be treated as a SO 2 absorbent of low volatility. Even though the SO 2 loading (0.63 g g À1 ) in NMP-2-Pyr (1 : 1) is slightly lower than that in pure NMP (0.68 g g À1 ) at 313.2 K and 1 bar (Fig.…”

Intensification of High Boiling Point Organic Solvents on SO2 Absorption in Deep Eutectic Solvents Formed by Hydroxypyridine and 1-Butyl-3-methylimidazolium Chloride

“…As shown in Figure , compared with the FT-IR spectra of the virgin DESs, new peaks presented at 953 and 1722 cm –1 could be ascribed to S–O stretch vibrations and the interaction of N of the 4-Op with SO 2 . ,, The above result indicated that there was chemical interactions between 4-Op/BmimCl (1:2) and SO 2 . The typical characteristic peaks appeared at 536, 1128, and 1310 cm –1 after DESs saturated with SO 2 , which could be ascribed to the bending vibration of SO 2 ,, and the symmetrical and asymmetrical stretching vibration of SO, , respectively. Generally, the symmetrical and asymmetrical stretching vibration of SO 2 were observed at 1145 and 1344 cm –1 in CCl 4 , respectively .…”

An imidazole-based DES serving as a “courier” for the efficient coupling of HCl capture and conversion under mild conditions

“…Fig. S2 † shows the 13 C NMR of the incomplete reaction products with imidazole hydrochloride and styrene oxide. Obviously, styrene oxide is not completely converted and its signal is very prominent.…”

“…22 Fig. 3a presents the 13 C NMR of the mixed mother liquor from Scheme 1f. It is found that there is no obvious styrene oxide that can be detected.…”