Dinitrotoluene(DNT) was prepared by nitrating toluene with nitric acid(97%) to avoid the use of mixed sulfuric acid/ nitric acid which is troublesome and energy-expensing for recycling. After investigating the factors affecting the nitration, the optimized conditions were worked out and might be as follows: molar ratio of nitric acid/ toluene 81, temperature 60 ℃, and time 1 h. The resulting DNT′s yield was 94%, purity was 98.8%, ratio of 2,4-DNT to 2,6-DNT was 4.3.
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尚雁,王伯周,叶志虎,等.二硝基甲苯的绿色合成[J].含能材料,2010,18(6):627-629. SHANG Yan, WANG Bo-zhou, YE Zhi-hu, et al. Green Synthesis of Dinitrotoluene[J]. Chinese Journal of Energetic Materials,2010,18(6):627-629.