Process for preparing isocyanates by thermally cleaving carbamates

US8822718B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Michael Bock · Ruppertsberg, DE
• Eckhard Stroefer · Mannheim, DE
• Robert Baumann · Mannheim, DE
• Axel Franzke · Goldkronach, DE
• Joachim Pfeffinger · Ludwigshafen, DE

Key dates

• Filing date: Nov 30, 2010
• Grant date: Sep 2, 2014
• Expiry date: Feb 8, 2031

Classification

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

Abstract

A process is proposed for preparing isocyanates by thermally cleaving carbamates to obtain a carbamate cleavage gas comprising the corresponding isocyanate and the corresponding alcohol, which comprises quenching the carbamate cleavage gas in the presence of an ether which functions as an inhibitor for the reverse reaction of the isocyanate with the alcohol.