Production of caprolactam by thermal depolymerization of polyamide 6

US5233037A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Werner Nielinger · Krefeld, DE
• Edgar Ostlinning · Goldkronach, DE
• Karsten-Josef Idel · Krefeld, DE
• Dieter Freitag · Krefeld, DE
• Hans-Josef Buysch · Krefeld, DE

Key dates

• Filing date: Aug 17, 1992
• Grant date: Aug 3, 1993
• Expiry date: Aug 17, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D201/12
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the production of caprolactam by thermal depolymerization of polyamide in the presence of small quantities of potassium carbonate at 250.degree. to 320.degree. C. and to a process for purifying the resulting caprolactam.