Investigating the efficiency of newly prepared imidazolium ionic liquids for carbon dioxide removal from natural gas

Four functionalized ionic liquids of the type 3-(n-aminoalkyl)-1,2-dimethyl imidazolium bis((trifluoromethyl)sulfonyl)imide (IL101 and IL102), and 3-(n-aminoalkyl)-1,2-dimethyl imidazolium tetrafluoroborate(IL103 and IL104) were synthesized and characterized via the conventional tools of analysis. The application of these compounds as potential industrial solvents for carbon dioxide removal from natural gas is studied. In our work we used bubbling technique, as chemical absorption one, for CO2 removal by chemical means involves one or more reversible chemical reactions between CO2 and another material to produce a liquid or solid species. The efficiency of synthesized ionic liquids for capturing carbon dioxide is ranked as follows, IL104 < IL103 < IL102 < IL101.