Process for the preparation of isocyanates by thermal cleaving of urethanes

US4482499A · kind A · utility

Assignee

• BASF SE

Inventors

• Franz Merger · Bischofswerda, DE
• Gerhard Nestler · Ludwigshafen, DE
• Rolf Platz
• Friedrich Towae · Ludwigshafen, DE
• Hans Hellbach · Bischofswerda, DE

Key dates

• Filing date: Oct 25, 1982
• Grant date: Nov 13, 1984
• Expiry date: Oct 25, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C263/04
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Organic isocyanates, preferably alkyl, mono-, di- and/or polyisocyanates or aryl-mono-, di- and/or polyisocyanates, are prepared by thermally cleaving the corresponding urethanes at temperatures of 175.degree. C. to 600.degree. C. in the presence of carbon, preferably in an agitated carbon bed or in a fluidized bed containing carbon.