Method for isolation of laurolactam from a laurolactam synthesis process stream

US8399658B2 · kind B2 · utility

Assignee

• EVONIK DEGUSSA GMBH · DE

Inventors

• Axel Hengstermann · Senden, DE
• Ralf Meier · Dortmund, DE
• Daniel Demicoli · Essen, DE
• Martin Roos · Oestrich-Winkel, DE
• Bernd Guenzel · Haltern am See, DE
• Frank Huebner · Ober-Ramstadt, DE

Key dates

• Filing date: Nov 22, 2010
• Grant date: Mar 19, 2013
• Expiry date: Apr 15, 2031

Classification

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

Abstract

A process for purifying laurolactam by means of integrated connection of distillation and crystallization is provided. The crystallization is performed as a solution or melt crystallization. The process reduces thermal stress applied to the laurolactam stream and improved yields are obtained. Raw materials are recovered and recycled in the production sequence.