Method for synthesis of 2,4-dichloro-3,5-dinitro trifluorotoluene in micro reactor
A technology of dinitrotrifluorotoluene and dichlorotrifluorotoluene is applied in the field of organic fine synthesis, and achieves the effects of convenient operation, reduction of raw material storage, transportation and reaction risks
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Embodiment 1
[0023] The molar ratio of 95% nitric acid-98% sulfuric acid is 1:4, and the molar ratio of 2,4-dichlorotrifluorotoluene is 1.05. The two streams enter the microchannel for reaction, the residence time is 120s, and the reaction temperature is 140°C. The conversion rate of 2,4-dichlorobenzotrifluoride was 97.2%, and the yield of 2,4-dichloro-3,5-dinitrobenzotrifluoride was 22.6%.
Embodiment 2
[0025] The molar ratio of 95% nitric acid-98% sulfuric acid is 1:5, and the molar ratio of 2,4-dichlorotrifluorotoluene is 1.05. The two streams enter the microchannel for reaction, the residence time is 120s, and the reaction temperature is 150°C. The conversion rate of 2,4-dichlorobenzotrifluoride was 97.7%, and the yield of 2,4-dichloro-3,5-dinitrobenzotrifluoride was 30.8%.
Embodiment 3
[0027] The molar ratio of 95% nitric acid-98% sulfuric acid is 1:6, and the molar ratio of 2,4-dichlorotrifluorotoluene is 1.05. The two streams enter the microchannel for reaction, the residence time is 150s, and the reaction temperature is 160°C. The conversion rate of 2,4-dichlorobenzotrifluoride was 98.1%, and the yield of 2,4-dichloro-3,5-dinitrobenzotrifluoride was 40.7%.
[0028] In the above embodiment, the reaction time is only about 200s, the operation is simple and the effect is good.
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