NO2催化硝化萘制备二硝基萘

simple method for the preparation of dinitronaphthalene from the nitration reaction of naphthalene with NO2 as nitration reagent instead of nitric-sulfuric mixed acid under the mild conditions has been successfully developed from the "strong-acid" to "non-acid" method in this work. The effects of different catalysts, the ratio of naphthalene to NO2, temperature and reaction time on the nitration were studied. The results indicat that Ni(CH3COO)2?4H2O catalyst shows better catalytic performances. From theresults of single-factor experiment, the optimal reaction conditions areas following: the reaction temperature is 100 ℃, reaction time is 3 h, and the molar ratio of naphthalene to NO2is 1:8. The conversion of naphthalene is 100% with 22.84%, 18.59% and 11.67% of the selectivity to 1,5-DNN, 1,3-DNN and 1,4-DNN, respectively. The total selectivity of 1,5-DNN, 1,3-DNN and 1,4-DNN is 53.1%. This method has advantages of environmentally benign, simple procedure and mild reaction conditions for the preparation of dinitronaphthalene, and it has important theoretical and practical significance.