公开(公告)号：RO64765A

公开(公告)日：1980-01-15

申请号：RO7267372

申请日：1972-10-30

Applicant: STAMICARBON

Inventor： GOETTSCH REIJER ,  VOS HERMAN M A

IPC: C07D201/04 ,  C07D201/16 ,  C07D223/10

Abstract: 1399000 #-Caprolactam STAMICARBON NV 27 Oct 1972 [29 Oct 1971 25 Aug 1972] 49733/72 Heading C2C #-Caprolactam obtained by the Beckmann rearrangement of cyclohexanone oxime with a sulphuric acid, oleum or SO 3 catalyst followed by dilution of the Beckmann rearrangement product with water and/or partial neutralization of the product by the addition of ammonia and/or a sulphuric acid salt of ammonia, extraction with a substantially water-immiscible organic solvent for the product lactam and removal of the solvent is recovered by neutralizing the lactam-containing solution with aqueous ammonia to a pH of at least 4À5 when measured at 20‹ C. to form an emulsion of an aqueous ammonium sulphate solution in the organic solvent, washing the said emulsion, optionally after settling of the emulsion and separating off the thereby-formed supernatant phase, with demineralized water in a weight ratio of 4 to 20 parts emulsion per 1 part of water, and extracting the thus-treated laetam-containing solvent with water, optionally treating the resulting aqueous lactam solution with cation and anion exchangers, and evaporating water from the said aqueous lactam solution. The #-caprolactam obtained contains less than 5 m.eq. of ionic substances per kg. of lactam.