Preparation of caprolactam by Beckmann rearrangement of cyclohexanone oxime

US5264571A · kind A · utility

Assignee

• BASF SE

Inventors

• Hugo Fuchs · Ludwigshafen, DE
• Gerald Neubauer · Weinheim, DE
• Josef Ritz · Ludwigshafen, DE

Key dates

• Filing date: Sep 30, 1992
• Grant date: Nov 23, 1993
• Expiry date: Sep 30, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D201/06
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing caprolactam by Beckmann rearrangement of cyclohexanone oxime with oleum at from 85.degree. to 125.degree. C. in a plurality of rearrangement stages arranged in series entails returning a portion of the reaction mixture leaving the last rearrangement stage to at least one of the preceding rearrangement stages.