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[bmim]OTf adopts two-step synthesis and the specific operation process are as follows: (1) The synthesis of [bmim]Cl: Molar ratio of N-methyl imidazole to chlorobutane 1:1 were mixed in a dry 250 ml flask with condensing facility, then heated with stirring for 48 h under 70 C. After reaction, reactants were washed for three times using ethyl acetate, and then streamed to remove ethyl acetate at 80 C. Finally, the pale yellow viscous liquid [bmim]Cl was obtained. (2) The synthesis of [bmim]OTf: Molar ratio of potassium trifluoromethanesulfonate to [bmim]Cl 1:1 were mixed, using dichloromethane as solvent, reflux condensation for 48 h under 60 C. After removing the dichloromethane by reduced pressure distillation at 40 C, the milky viscous liquid [bmim]OTf is obtained finally.
In water; at 20℃; for 24h;
8.25 g of the above-mentioned ionic liquid,KCF3SO39.4g were dissolved in 20 mL of water, respectively,Room temperature reaction 24h,Adding dichloroethane to remove water,The dichloroethane was removed under reduced pressure,80 vacuum drying 12h,The ionic liquid [Bmim] CF3SO3.
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