Synthesis, characterization and application of 1-(2-cyanoethyl)-3-(3-methoxypropane)imidazolium bromide for CO₂capture

Abstract

Abstract. Amine scrubbing is dominating in carbon dioxide (CO2) capturing technology because of its high affinity towards CO2. However, the drawbacks of amine solvents are its high corrosivity and volatility. Ionic liquids (ILs) have gained a lot of attention in recent years for CO2 capturing and have been proposed to be one of the promising alternative to the conventional solvents. The objective of this research is to design a new imidazolium based ether-nitrile functionalized ionic liquid of low viscosity to improve CO2 capturing. The molecular structure of the ionic liquid were confirmed by 1 H NMR, 13 C NMR and FTIR. The thermal properties; glass transition temperature, thermal decomposition temperature, and their physical properties; water content and density were determined. The solubility of CO2 in the synthesized ionic liquid was measured using pressure drop method. They showed high thermal stability above 200°C and the glass transition temperature was -49.80°C. The CO2 sorption in the newly synthesized IL was 0.08, 0.12, 0.29, 1.01, 2.30 mol of CO2/mol of IL at pressures 1, 5, 10, 15 and 20 bar respectively.

Ionic liquids and deep eutectic solvents for the recovery of phenolic compounds: effect of ionic liquids structure and process parameters

“…À as anions were used for phenol extraction and their efficiency followed the order: Cl À > Br À > BF 4 À > PF 6 À . 142 This result further supports the hypothesis that the nature of the IL anion has a key role in phenol extraction.…”

“…Furthermore, imidazolium based ILs containing Cl − , Br − , BF 4 − and PF 6 − as anions were used for phenol extraction and their efficiency followed the order: Cl − > Br − > BF 4 − > PF 6 − . 142 This result further supports the hypothesis that the nature of the IL anion has a key role in phenol extraction. On the other hand, ILs containing tetraethylammonium cations and various amino acid-based anions such as alanine, glycine, proline, sarcosine, and lysine showed high efficiency of phenol extraction (>97%) with small differences between them.…”

“…This high viscosity is considered a great drawback and poses a serious limitation in industrial applications. 142,143 On the other hand, high viscosity in certain applications, such as lubrication, is favorable. IL viscosity is considered an important property in the extraction process, however, there is no report available on the effect of viscosity on phenol extraction.…”

Extraction of Phenol as Pollutant from Aqueous Effluents Using Hydrophobic Deep Eutectic Solvents

“…1-butyl-3-methylimidazolium and other ILs have shown exceptional extraction capabilities, achieving up to 99.9% phenol removal [30]. Nevertheless, the wider use of ILs in industrial sectors is hindered by issues related to increased toxicity with longer alkyl chains, susceptibility to impurities affecting their physical and chemical properties, and the high cost of their synthesis and purification [31][32][33].…”