公开(公告)号：CA1178918A

公开(公告)日：1984-12-04

申请号：CA379403

申请日：1981-06-09

Applicant: STAMICARBON

Inventor： GOETTSCH REIJER ,  JETTEN ARNOLD G M

IPC: C07D207/26 ,  C07D201/16 ,  C07D207/267

Abstract: 3199 In a distillation process pyrrolidone obtained from succinonitrile is purified by treating the impure liquid pyrrolidone with a strong base, fractionally distilling this product to yield, as distillate, polymerization grade pyrrolidone, mixing the 2-pyrrolidone-containing residue from the fractional distillation with water and an acid, and extracting purified pyrrolidone from the water/acid mixture. The latter purified pyrrolidone product is suitable for recycling to the pyrrolidone synthesis or to make other products.

公开(公告)号：CA1221365A

公开(公告)日：1987-05-05

申请号：CA461995

申请日：1984-08-29

Applicant: STAMICARBON

Inventor： PLANTEMA OTTO G ,  JETTEN ARNOLD G M ,  HAASEN NICOLAAS F

IPC: C07D201/16 ,  C07D223/10

Abstract: The invention relates to a process for recovering caprolactam from residue remaining after distillation, under reduced pressure, of impure caprolactam obtained from rearrangement of cyclohexanone oxime with sulphuric acid or oleum, comprising subjecting the residue to distillation under reduced pressure, hydrogenating the caprolactam-containing distillate so obtained in an aqueous medium and recovering caprolactam from the resulting hydrogenation product. The process provides a way of recovering the valuable caprolactam from the residue without need of any strong acid treatment and only requiring one distillation step.