Imidazolium bromide ionic liquid containing amine groups and preparation method and application of ionic liquid

The invention relates to imidazolium bromide ionic liquid containing amine groups and a preparation method and application of the ionic liquid. The structural formula of the imidazolium bromide ionic liquid containing amine groups is shown as the formula (I). Under protection of nitrogen, 3-bromopropylamine hydrobromide or 2-bromoethylamine hydrobromide and imidazole are dissolved in anhydrous ethanol after being mixed, reflux reaction is conducted for 20-25 h at 85-95 DEG C, ethanol is removed through vacuum distillation, an organic solvent is added, stirring and filtering are conducted, the organic solvent is removed from filter liquid through vacuum distillation, a KOH aqueous solution is added after vacuum drying so that the pH of the solution can be 8-9, filtering is conducted, solid is added into anhydrous ethanol and stirred, filtering is conducted again, filter liquid is dried in a vacuum mode, and the target product is obtained. In the process that catalytic epoxidation compound is used for synthesiz