离子液体催化甲苯绿色硝化反应研究

Green Nitration of Toluene in Ionic Liquids

合成了1-甲基-3-丙磺酸基咪唑硫酸氢盐[MIMPS][HSO4]功能化室温离子液体,以[MIMPS][HSO4]作催化剂,质量分数为68%的硝酸为硝化试剂,能够实现甲苯绿色硝化反应。原料n(硝酸)∶n(甲苯)∶n(催化剂)为150∶50∶1,于60℃下反应10 h,一硝化产率为70.4%,选择性100%,p/o值为0.7。反应结束产物与催化体系分层,通过简单的倾析可实现产物的分离,催化剂能够循环使用。

Novel BrФnsted ionic liquid 1-metyl-3-propanesulfonic acid immidazolium hydrogen sulfate[ MIMPS] [ HSO4 ] was prepared as catalyst for the green chemical processes of nitration reaction. Nitration reaction was carried out for 10 h at 60 ℃ with the catalyst to reactant molar ratio of 1 ： 50, and the yield of mononitration reaction was 70.4%, and selectivity of mononitration reaction was 100% with a para to ortho ratio of 0.7. Biphasie system of product and catalyst was obtained and the product could be separated simply by decantation. In addition, ionic liquid could be recovered and reused showing the possibility of a clean chemical process.