Acid ionic liquids and preparation method based on the perfluoroalkyl sulfonic acid anions

Acid ionic liquids and preparation method based on the perfluoroalkyl sulfonic acid anion, such an ionic liquid of formula represented by the following formula: wherein, m for 3 or 4, represents an integer of n 1-9, R is -CH3, -CH2CH3, or - (CH2) 3CH3. The preparation process: The resulting substance containing heterocyclic compound or a reaction with ethylene chlorohydrin as precursors choline chloride; then the precursor with a perfluoroalkyl sulfonate displacement reaction occurs, the substituted Cl- CF3 ( CF2) nSO3- obtain an intermediate; and the use of the intermediate sultone -OH cationic ring-opening reaction of a sulfonic acid group is introduced to obtain an objective ionic liquid. The present invention is an ionic liquid obtained is compared with a sulfonic acid ionic liquids before, reduced viscosity, enhanced design, green synthesis process, can be used as a conventional liquid acid catalyst substitute, a wider range of use, it has a good industrial prospects.