A novel ionic liquid based on small size cation

Low-Viscosity Triethylbutylammonium Acetate as a Task-Specific Ionic Liquid for Reversible CO2 Absorption

“…On the basis of our former experience about the preparation of amino acid ionic liquid with low viscosity, the small molecular weight of ions and a flexible alkyl chain can reduce the viscosity . Besides, a small volume and asymmetric structure of the ions can also lead to the decrease of viscosity, and the presence of water or organic solvents is an external contribution for low viscosity. The reason for the viscosity of [N 2224 ] [CH 3 COO]−1H 2 O being lower than that of [N 2222 ][ l -Ala] has already been discussed.…”

“…On the basis of our former experience about the preparation of amino acid ionic liquid with low viscosity, the small molecular weight of ions and a flexible alkyl chain can reduce the viscosity. 22 Besides, a small volume 30 and asymmetric structure 31 of the ions can also lead to the decrease of viscosity, and the presence of water or organic solvents 32 because both chemical and physical absorptions occur simultaneously. The solubility behavior of CO 2 has to be described using not only Henry's law constant (H m ) but also the reaction equilibrium constant (K a ).…”

“…Some pioneering works have shown that ILs could reversibly trap acidic gases, e.g., CO 2 and SO 2 , − and extensive efforts were followed on studying the improvement of CO 2 solubility in ILs. , It is found that some CO 2 -philic functional groups, such as fluorine, carbonyl groups, and dicyanamide, are good for CO 2 capture. However, due to the potential contaminations and high cost, many researches have paid much attention to the functionalization of ILs by designing the structures of both cations and anions according to the practical needs and special purposes, so that task-specific ionic liquids (TSILs) for absorbing CO 2 with high capacity and high selectivity could be obtained. − Others tried to utilize the ILs in facilitated transport membranes or on porous silica gel for acidic gas separations. − To our knowledge, most supported membrane processes have to be applied under the constraints of their small industrial scales, whereas most TSILs such as amine-appended ILs confront the unexpected high viscosity that causes long absorption equilibrium time and unfavors the mass and heat transfers during the absorption. Therefore, reducing the viscosity of TSILs is becoming a critical issue for practical applications.…”

“…[26][27][28] Others tried to utilize the ILs in facilitated transport membranes or on porous silica gel for acidic gas separations. [29][30][31] To our knowledge, most supported membrane processes have to be applied under the constraints of their small industrial scales, whereas most TSILs such as amine-appended ILs confront the unexpected high viscosity that causes long absorption equilibrium time and unfavors the mass and heat transfers during the absorption. Therefore, reducing the viscosity of TSILs is becoming a critical issue for practical applications.…”

Protein separation using a novel silica-based RPLC/IEC stationary phase modified with N-methylimidazolium ionic liquid

“…25 Recently, ionic liquids (ILs) immobilized on silica as novel HPLC 26 stationary phases have attracted considerable attention for their 27 differential behavior and low free-silanol activity due to their 28 useful and desirable physicochemical properties, such as low 29 melting point, low volatility, and high dissolvability [6][7][8]. Indeed, 30 around more than 20 species of surface-confined ionic liquids 31 stationary phases have been developed in the recent years [9].…”