Three liquid phase material feeding nozzle for caprolactam rearrangement reaction

The present invention provides a three liquid phase material feeding nozzle for a caprolactam rearrangement reaction. The three liquid phase material feeding nozzle mainly comprises an inlet tube, an outlet tube, a first plug and a second plug, wherein the upstream wall of the inlet tube is provided with 1-20 through holes, the throat portion of the outlet tube is provided with 1-20 liquid inlet holes, an annular gap is formed between the first plug and the inner wall of the inlet tube, and the second plug center column and the throat portion form an upstream gap and a downstream gap. According to the present invention, a solvent n-hexane enters the nozzle from the inlet, cyclohexanone oxime enters from the through hole on the side wall, the two phases of the liquids form cross flow so as to accelerate a dissolving rate of the cyclohexanone oxime, a fuming sulphuric acid-containing amidation liquid enters the nozzle from the liquid inlet hole on the throat portion, and turbulent flow of the mixed liquid is en