30345-49-4Relevant articles and documents
High-Performance Porous Ionic Liquids for Low-Pressure CO2 Capture**
Avila, Jocasta,Chung Szeto, Kai,Costa Gomes, Margarida,Denis-Quanquin, Sandrine,Lepre, L. Fernando,Padua, Agilio A. H.,Santini, Catherine C.,Tiano, Martin
, p. 12876 - 12882 (2021)
Porous ionic liquids are non-volatile, versatile materials that associate porosity and fluidity. New porous ionic liquids, based on the ZIF-8 metal–organic framework and on phosphonium acetate or levulinate salts, were prepared and show an increased capacity to absorb carbon dioxide at low pressures. Porous suspensions based on phosphonium levulinate ionic liquid absorb reversibly 103 % more carbon dioxide per mass than pure ZIF-8 at 1 bar and 303 K. We show how the rational combination of MOFs with ionic liquids can greatly enhance low pressure CO2 absorption, paving the way towards a new generation of high-performance, readily available liquid materials for effective low pressure carbon capture.
Amphiphilic and phase-separable ionic liquids for biomass processing
Holding, Ashley J.,Heikkilae, Mikko,Kilpelaeinen, Ilkka,King, Alistair W. T.
, p. 1422 - 1434 (2014)
One main limiting factor for the technoeconomics of future bioprocesses that use ionic liquids (ILs) is the recovery of the expensive and potentially toxic IL. We have demonstrated a new series of phase-separable ionic liquids, based on the hydrophobic tetraalkylphosphonium cation ([PRRRR] +), that can dissolve lignin in the neat state but also hemicellulose and high-purity cellulose in the form of their electrolyte solutions with dipolar aprotic solvents. For example, the IL trioctylmethylphosphonium acetate ([P8881][OAc]) was demonstrated to dissolve up to 19 wt % of microcrystalline cellulose (MCC) at 60 °C with the addition of 40 wt % of DMSO. It was found that the MCC saturation point is dependent on the molar ratio of DMSO and IL in solution. At the optimum saturation, a ～1:1 molar ratio of [P8881][OAc] to anhydroglucose units is observed, which demonstrates highly efficient solvation. This is attributed to the positive contribution that these more amphiphilic cation-anion pairs provide, in the context of the Lindman hypothesis. This effective dissolution is further illustrated by solution-state HSQC NMR spectroscopy on MCC. Finally, it is also demonstrated that these electrolytes are phase separable by the addition of aqueous solutions. The addition of 10 % NaOAc solution allows a near quantitative recovery of high-purity [P8881][OAc]. However, increased volumes of aqueous solution reduced the recovery. The regenerated material was found to partially convert into the cellulose II crystalline polymorph. Solving the dissolving: Hydrophobic wood-biopolymer-solvating ionic liquids are developed that are phase separable from aqueous solutions as a means of recycling. These ionic liquids are excellent solvents for cellulose in the form of their DMSO electrolyte solutions but only dissolve lignin as the pure ionic liquids.
Encapsulated Amino-Acid-Based Ionic Liquids for CO2 Capture
Silva, Liliana P.,Moya, Cristian,Sousa, Marco,Santiago, Ruben,Sintra, Tania E.,Carreira, Ana R. F.,Palomar, José,Coutinho, Jo?o A. P.,Carvalho, Pedro J.
supporting information, p. 3158 - 3166 (2020/08/10)
Ionic liquids have gathered special attention due to their potential for carbon dioxide capture, and their potential as solvents for mitigation of climate change. Following the scope of previous works, amino-acid-based ionic liquids encapsulated (ENILs) into carbonaceous submicrocapsules are here proposed as a novel material for CO2 capture. The ENILs prepared using tetrabutylphosphonium acetate ([P4,4,4,4][Ac]), used as reference, (2-hydroxyethyl)trimethylammonium l-phenylalaninate ([N1,1,1,2(OH)][L-Phe]), (2-hydroxyethyl)trimethylammonium l-prolinate ([N1,1,1,2(OH)][L-Pro]), and tetrabutylammonium l-prolinate ([N4,4,4,4][L-Pro]) were characterized by SEM, TEM, elemental analysis, TGA, and BET to assess their morphology, chemical composition, porous structure, and thermal stability. The absorption of CO2 on these materials was studied up to 0.5 MPa and 343 K. The desorption of CO2 from the saturated ENILs was evaluated, under mild conditions, evidencing these materials as promising agents for CO2 capture from post-combustion sources, with high sorption capacity and fast and complete regeneration.
