Continuous nitration method of benzene series

The invention relates to the technical field of chemical engineering, in particular to a continuous nitration method of benzene series. According to the method provided by the invention, a loop reactor is adopted for nitration reaction, the loop reactor comprises a first-stage tubular reactor, a second-stage tubular reactor and a circulating pump which are communicated with one another, and benzene series, fuming nitric acid and sulfuric acid continuously enter the loop reactor respectively; under the action of the circulating pump, the circulating materials circularly flow between the first-stage tubular reactor and the second-stage tubular reactor to generate nitration reaction, the ratio of the circulating flow velocity to the total feeding flow velocity is (30-500): 1, and the circulating flow velocity is far greater than the total feeding flow velocity, so that the reaction materials can be quickly dispersed by a large amount of circulating materials after entering the loop reactor, and the reaction effi