According to the experimental princ

According to the experimental principle, an intermediate liquid ion [bmim] BR was first prepared in this part. The specific test steps are as follows: take a 250 ml three-necked magnetic stirrer and connect to a condensation reflux tube, place 0.3 mol of N-methylimidazole and 0.3 mol of n-butane bromide in the flask, place the thermometer and cork in one port and place the cork to another seal port to ensure its durability. After connecting the condenser tube, connect the three necks of the flask and enter it in the magnetic stirrer of the manifold. Heat it at 70,8451; Water bath and stirring for three hours. A light yellow viscous liquid is created. Pour it into a separatory funnel and rinse it 1-3 times with n-hexane. Take the light yellow viscous liquid in the bottom layer and place it on a rotary evaporator for rotary evaporation. Remove the remaining n-hexane to give a light yellow or almost colorless ionic liquid.