Continuous purification of caprolactam

US5032684A · kind A · utility

Assignee

• BASF SE

Inventors

• Gerald Neubauer · Weinheim, DE
• Josef Ritz · Ludwigshafen, DE
• Hugo Fuchs · Ludwigshafen, DE
• David Agar · Rimbach, DE
• Rolf Fischer · Heidelberg, DE
• Uwe Vagt · Speyer, DE

Key dates

• Filing date: Jul 12, 1990
• Grant date: Jul 16, 1991
• Expiry date: Jul 12, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D201/16
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Caprolactam is purified continuously by passing a 75-95% strength by weight aqueous caprolactam solution together with hydrogen at 50.degree.-95.degree. C. and 1.5-100 bar upward through a fixed-bed supported palladium or nickel catalyst in a tubular zone while maintaining a residence time of from 10 to 100 min.