公开(公告)号：CA1182775A

公开(公告)日：1985-02-19

申请号：CA402546

申请日：1982-05-07

Applicant: STAMICARBON

Inventor： RULKENS PETER F M ,  HAASEN NICOLAAS F ,  PLANTEMA OTTO G

IPC: B01D3/14 ,  C07D201/16

Abstract: 1. Process for the purification of .epsilon.-caprolactam, obtained through rearrangement of cyclohexanone oxime by means of sulphuric acid or oleum, by subjecting the caprolactam to be purified to distillation under reduced pressure, with separation of low-boiling and high-boiling impurities. The distillation is carried out in two steps with at least in the 1st step an evaporator with a rectification column containing packing material with a pressure drop of less than 2.5 mbar per theoretical tray. The caprolactam to be purified is supplied to the rectification column of the 1st step, the low-boiling impurities are carried off from this column, the bottom product remaining in the 1st step is supplied to the 2nd step and in this step the high-boiling impurities are carried off as bottom product. The purified caprolactam is recovered as top product.