Synthesis of Acidic Ionic Liquids and Catalysts Application of Benzaldehyde Acetal

Three novel ionic liquids were synthesized using benzyl chloride, N-ethyl imidazole and pyridine as raw materials, the structure of these products were charactered, and these materials were applied to catalytic synthesis of benzaldehyde acetal. Compared with the traditional catalyst, the N-ethyl imidazole-N(p-sulfo)benzalhydantoin-chloride imidazole salt ionic liquids have good catalytic activity. The synthesis reaction of benzaldehyde acetal catalyzed by the acidic ionic liquid was studied. The result shows that the yield of benzaldehyde acetal was 88.59% under the following conditions: molar percentage of catalyst relative to the reactants 2.8%, reaction temperature 125˚C and reaction time 2 h. The catalytic activity maintains stable even the acidic ionic liquid was used 4 times.