METHOD AND APPARATUS FOR RECOVERING CAPROLACTAM IN BENZENE DISTILLATION RESIDUE

摘要

The present invention relates to a method and apparatus for recovering caprolactam in benzene distillation residue, and provides a method for recovering caprolactam in benzene distillation residue, comprising the following steps: (a) separately feeding into a centrifugal extractor the benzene distillation residue and water obtained after distillation in a benzene distillation column; (b) causing the benzene distillation residue and water fully to mix and undergo mass transfer in the centrifugal extractor, in order to extract the caprolactam in the benzene distillation residue into the water; (c) performing liquid-liquid separation of the mixed solution of benzene distillation residue and water by means of the centrifugal extractor, in order to separate an aqueous solution rich in caprolactam and the benzene distillation residue from which the caprolactam has been removed; and (d) recycling the aqueous solution rich in caprolactam separated out in step (c), and incinerating the benzene distillation residue from which the caprolactam has been removed. The apparatus for recovering caprolactam in benzene distillation residue is also provided.