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US4804754A Preparation of caprolactam from cyclohexanone oxime by Beckmann rearrangement 失效
通过Beckmann重排从环己酮肟制备己内酰胺

Preparation of caprolactam from cyclohexanone oxime by Beckmann
rearrangement
摘要:
Caprolactam is prepared in a process comprising(a) a Beckmann rearrangement of cyclohexanone oxime with oleum at from 70.degree. to 130.degree. C. in one or more rearrangement stages, and(b) aftertreatment of the reaction mixture obtained from the rearrangement stage in a delay zone at from 70.degree. to 110.degree. C. for from 10 to 600 minutes.
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