Novel alcamines ionic liquids based solvents: Preparation, characterization and applications in carbon dioxide capture

This work presents a study to apply ionic liquids as potential industrial solvents for carbon dioxide capture. In order to obtain effective and low cost ionic liquids solvents, novel alcamines ionic liquids of 2-aminoethanol tetrafluoroborate, 2-[2-hydroxyethyl (methyl) amino] ethanol tetrafluoroborate, 2-[2-hydroxyethyl (methyl) amino] ethanol phosphate, 2-[2-hydroxyethyl (methyl) amino] ethanol sulfate and 2-[2-hydroxyethyl (methyl) amino] ethanol chloride were synthesized and characterized. Ten ionic liquids solvents of amines + ionic liquids + H2O, ionic liquids + H2O were prepared by mixing two or three compounds of 2-aminoethanol, 2-[2-hydroxyethyl (methyl) amino] ethanol, 2-[bis (2-hydroxyethyl) amino] ethanol, ionic liquids and water to capture carbon dioxide. Additionally, CO2 capture performances in three traditional amines + H2O solvents were also investigated. The results show that 2-[2-hydroxyethyl (methyl) amino] ethanol + 2-[2-hydroxyethyl (methyl) amino] ethanol chloride + H2O + piperazine (MCHP) system is the best among the prepared solvents. The regeneration performance of the solvent was also investigated. Mechanisms of CO2 absorption and desorption with the synthesized ILs are obtained by in situ FTIR spectra analysis.