Protic ionic liquid as excellent shuttle of MDEA for fast capture of CO₂

Abstract

A cheap protic ionic liquid (PIL), 3-(Dimethylamino)-1-propylamine acetate (abbreviated as [DMAPAH][Ac]), is investigated in this work as the activator of N-methyldiethanolamine (MDEA) for fast capture of CO 2 . The PIL-activated MDEA solutions show excellent performance in absorption rate and capacity (!2.5 molÁkg 21 ). A novel absorption mechanism is proposed to account for the phenomenon, where the shuttling role of the PIL is described in detail. Additionally, the enthalpy change DH SOL (245 to 252 kJÁmol 21 ), the turnover number of the PIL and the regeneration efficiency (>92%) are also measured. All these data show that the PIL-mediated MDEA solutions may be used as a kind of promising absorbents for fast capture of CO 2 . Figure 2. Absolute absorption capacity (a) and relative CO 2 loading (moles of CO 2 absorbed by per mole of PIL) (b) of PIL aqueous solutions as a function of the PIL concentration (ٗ: 60 wt %; ᭺: 70 wt %; ᭝: 80 wt %; ᭞: 90 wt %) at T 5 308.15 K.

Ionic Liquids/Deep Eutectic Solvents-Based Hybrid Solvents for CO2 Capture

“…5:1, respectively) and hybrid with MEA for CO2 capture, respectively[30]. According to T Figure2, the hybrid solvents of the synthesized ILs with an additional MEA showed enhan lubility, which agrees with the studies from Zeng et al[50] and Meng et al [51] that app and DMEE as the hybrid solvents to [DMAPAH][Ac] and [N1111][Lys], respectively. Am [DMAPAH][Formate]…”

Highly Efficient and Reversible Nitric Oxide Capture by Functionalized Ionic Liquids through Multiple-Site Absorption

“…In recent years, ionic liquids (ILs) have been proposed as ideal absorbents used for the absorption and the release of gas, such as SO 2 , H 2 S, CO 2 , CO, and NO x , due to their outstanding properties such as negligible vapor pressure, high thermal stability, and tunable properties. − For example, Davis and co-workers reported the first example of CO 2 chemisorption by an amino-functionalized IL, where 0.5 mol of CO 2 per mole of IL was captured under ambient pressure . Subsequently, Han group presented the first SO 2 chemical absorption by functionalized ILs tetramethylguanidinium lactate, which absorbed about 1 mol of SO 2 per mol of IL with 8% SO 2 in a gas mixture of SO 2 and N 2 .…”

Highly Efficient Absorption of CO2 by Protic Ionic Liquids-Amine Blends at High Temperatures

“…In particular, DMAPA-based ionic liquids can effectively absorb CO 2 through intramolecular proton transfer. 24 But more than that, amine must have the advantages of low viscosity, high CO 2 capacity, fast adsorption rate, and so on when it is used to modify IL. Therefore, we note that EDA has preponderance and is widely praised for capturing CO 2 .…”