Guanidinium-based ionic liquids for sulfur dioxide sorption

Guanidinium‐based dicarboxylic acid ionic liquids for SO2 capture

“…Such hydrogen bonding interactions could be attributed to the acidic character of hydrogen atoms in methylene groups located beside electron‐withdrawing carbonyl carbon groups . In addition, considering the tiny peak shifts for the methyl groups bonded to the nitrogen atoms, it is evident that SO 2 interacts chemically with [TMG][SUB] through the amino group, forming an ionic species with covalently bound ‐NH‐SO …”

“…On the basis of FTIR, UV, NMR spectra of SO 2 ‐free and SO 2 ‐absorbed ILs as well as the correlative absorption mechanisms proposed, the mechanism for [TMG][PBE] was proposed for the absorption of SO 2 by task‐specific ILs, as shown in Fig. .…”

“…Their results showed that one mole of [TMG]L could absorb 1 mol SO 2 from a mixture of SO 2 and N 2 at 40 ∘ C under ambient pressure; then the absorbed SO 2 can be reversibly desorbed by vacuum or heating. Shang et al 6 also synthesized three guanidinium-based ionic liquids which had showed high SO 2 absorption rate. These ILs could absorb SO 2 by both physical and chemical interactions while physical absorption plays an important role at the temperature of 40 ∘ C. Lu et al 7 introduced the ethyl sulfate ([C 2 OSO 3 ] − ) anion into the structure of guanidinium-based ILs to form two novel low-cost ethyl sulfate ILs.…”

Thermodynamic properties and spectral investigation of dilute sulfur dioxide in binary system N,N-dimethylformamide+diethylene glycol

“…But these removing technologies of SO 2 have some intrinsic disadvantages, including high capital and operating costs, poor quality of byproduct, and secondary pollution [5,6]. Recently, room-temperature ionic liquids (RT-ILs) [7][8][9][10] attracted more interests due to their advantages, such as good solubility and high selectivity to SO 2 . However, the high expense and viscosity of ionic liquids limited their uses in industry application.…”

SO2-Induced Variations in the Viscosity of Ionic Liquids Investigated by in Situ Fourier Transform Infrared Spectroscopy and Simulation Calculations

“…To develop a new process based on ILs for gas separation, taking SO 2 as an example, a number of efforts have been spent in designing the novel functionalized ILs for higher absorption capacity of SO 2 and lower absorption enthalpy, and studying the mechanism between SO 2 and ILs by experimental methods and simulation calculations [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] . Nevertheless, although the available studies on different aspects of ILs have increased almost exponentially, understanding deeply the physical properties of ILs is still a major point of discussion, which is essential for the design and scale-up of chemical processes in their applications.…”