|
This experiment the target product synthesized tetrafluoroborate, 1 - butyl-3 - methylimidazolium ionic liquid is a vapor pressure approximately equal to zero , the less volatile , non-flammable, the electrical conductivity and strong , stable below 300 ℃ occurring substances . Has a good prospect in the field of separation processes , electrochemical and catalytic reaction processes . CEM Corporation of the United States Discover microwave precision organic synthesis reactor , chloro-n- butane, nitrogen methylimidazole and ammonium tetrafluoroborate in both conventional and microwave heating under two conditions , synthetic tetrafluoroborate of the target product 1 - butyl - 3 - methylimidazolium ionic liquids studied reaction time, ratio of reactants, reaction power and other factors on the synthesis reaction . Experimental results show that the conventional heating method , the optimum reaction conditions were: temperature 70 ° C , the raw material molar ratio (N-methyl imidazole : chloro-n- butane: ammonium tetrafluoroborate ) is 1:1:1 , and the reaction time was 7 hrs, the ionic liquid yield 60% . Microwave heating experiments , the optimal reaction conditions : temperature 70 ° C , the molar ratio of 1:1:1 , heating power 140W, reaction time of 40 minutes , the yield was 80% . By comparison of two experimental methods found that the reaction time of the microwave heating method is less than conventional heating method , 1 /10 , and the ionic liquid product yield increased by more than 30% . The results showed that the microwave heating method to significantly improve the efficiency of the synthesis reaction .
|