Loop reactor with efficient Venturi ejector

A loop reactor body is provided with a high-pressure reaction kettle and a reaction mixer, the venturi ejector is arranged in the reaction mixer, and an air chamber at the upper end of the venturi ejector is communicated with a conical bin and an air inlet pipe. A circulating pump is installed on a conveying pipeline at the lower end of the high-pressure reaction kettle, the output end of the circulating pump is connected with an inlet of a heat exchanger, an outlet in the upper end of the heat exchanger is communicated with an inlet of a separation system, the separation system is externally connected with a product output pipe, and the other end of the separation system is connected with a backflow pipe. According to the utility model, a high active catalyst suspension state is maintained, a nitro compound is continuously fed into a reaction mixing area, meanwhile, hydrogen and the active catalyst are fully mixed with the nitro compound, nitro conversion is immediately carried out, and the reaction is fully