Purification of caprolactam

US4148792A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Harry Danziger · London, GB
• Otto Immel · Krefeld, DE
• Bernd-Ulrich Kaiser
• Guido Rampart · Ekeren, BE
• Hans-Helmut Schwarz · Krefeld, DE

Key dates

• Filing date: Jun 15, 1978
• Grant date: Apr 10, 1979
• Expiry date: Jun 15, 1998

Classification

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

Abstract

A process for the purification of .epsilon.-caprolactam, wherein .epsilon.-caprolactam is treated with potassium permanganate in the presence of from 0.01 to 5% by weight of water, based on caprolactam, and subsequently crystallized from toluene, benzene, ethylbenzene or xylene.