Method and device for producing caprolactam through rearrangement of cyclohexanone oxime

The invention provides a method and device for producing caprolactam through the rearrangement of cyclohexanone oxime. The device mainly comprises an amidation reactor, a rearrangement reactor, an oximation reactor, a cyclone extraction separator and a hydrolysis reactor, wherein the cyclone extraction separator comprises a motor, an outer cylinder, an inner cylinder, an inlet for a separated liquid, an inlet for an extraction agent and outlets for light and heavy phases. After an amidated reaction liquid is subjected to extraction separation through the cyclone extraction separator, the heavy phase is used as a catalyst, and is mixed with cyclohexanone oxime before entering the rearrangement reactor for rearrangement reaction, thus generating caprolactam, wherein the extraction agent used for extraction separation is normal hexane, and the temperature for cyclone extraction separation is 60-130 DEG C. By using the cyclone extraction separator, the invention separates active components and impurities in the a