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o-Nitrotoluene nitration can produce 2,4-dinitrotoluene and 2,6-dinitrotoluene simultaneously, which is also the common side-reaction of toluene mononitration. Kinetic study is helpful to deepen the understanding of nitration and control the reaction better. A homogeneously continuous microflow system was constructed to determine the kinetic parameters of 2-MNT nitration. A complete kinetic model was established and all kinetic parameters were obtained. In general, the observed reaction rate will increase with increasing H2SO4 mass fraction. However, when the H2SO4 mass fraction increases to a certain value, the observed reaction rate decreases. This is the first time to report the maximum observed reaction rate constant corresponding to the H2SO4 mass fraction at different temperatures in this work. Compared to previous reports on this reaction, the system provides more accurate kinetic parameters and can be developed into a reliable platform for the kinetic study of similar reactions.

A novel observation platform by placing the downstream observation window vertically has been constructed, and the actual micro-dispersion state can be exactly reflected in the observation window.

Microfluidic technologies are reliable methods to obtain uniform and tiny droplets, but their application is limited by the capacity of single microchannel and the difficulty in fabrication and operation of large amounts of parallel droplet generators. Here, we reported a microchannel device equipped with multiple capillaries for rupturing the dispersed fluid, which realized droplet generation frequency up to 40 kHz in a single microchannel. The microchannel was operated under jetting flow, which was robust for controlling the droplet size uniformity; therefore, the device did not need highly precise machinery and accurate installation during fabrication. 30–100 μm droplets with CV