Purification of a crude lactam mixture by means of melt crystallization

US7807826B2 · kind B2 · utility

Assignee

• EVONIK DEGUSSA GMBH · DE

Inventors

• Axel Hengstermann · Senden, DE
• Ralf Meier · Dortmund, DE
• Bernd Gunzel · Haltern am See, DE
• Martin Roos · Oestrich-Winkel, DE
• Stephan Schäflein · Haltern, DE
• Bernd-Holger Modrow · Herne, DE

Key dates

• Filing date: Oct 2, 2008
• Grant date: Oct 5, 2010
• Expiry date: Oct 2, 2028

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D225/02
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention provides a method for purifying laurolactam from a crude lactam mixture. In the method of the present invention, laurolactam is selectively crystallized by melt crystallization with controlled cooling of the crude lactam mixture.