公开(公告)号：DE2430757A1

公开(公告)日：1975-01-23

申请号：DE2430757

申请日：1974-06-26

Applicant: STAMICARBON

Inventor： DE ROOIJ ABRAHAM HERMANUS ,  ELMENDORP JANS

IPC: C01C1/24 ,  C01C1/242 ,  C05C3/00 ,  C07D201/16 ,  C07D223/10

Abstract: epsilon -CAPROLACTAM IS RECOVERED FROM A Beckmann rearrangement mixture of the lactam and aqueous sulfuric acid by simultaneously neutralizing the rearrangement mixture with ammonia at a pressure of 1-5 atmospheres and crystallizing out ammonium sulfate, the heat liberated by the neutralization reaction is removed from the system by evaporating a portion of the water from the solution. At the conditions employed hydrolysis of the lactam is substantially reduced if not entirely avoided.