Process for the phosgenation of amines in the gas phase using microstructure mixers

US6225497A · kind A · utility

Assignees

• BAYER HEALTHCARE LLC · DE
• Forschungszentrum Karlsruhe GmbH · DE

Inventors

• Gernot Becker · Stuttgart, DE
• Konrad Fischer · Odenthal, DE
• Andreas Flink · Dormagen, DE
• Erhard Herrmann · Leverkusen, DE
• Lothar Weismantel · Neunburg vorm Wald, DE
• Georg Wiessmeier · Bensberg, DE
• Klaus Schubert · Karlsruhe, DE
• Maximillian Fichtner · Oftersheim, DE

Key dates

• Filing date: Jan 6, 1999
• Grant date: May 1, 2001
• Expiry date: Jan 6, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2601/14
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for rapidly mixing phosgene and an amine in the gas phase to produce the corresponding isocyanate. Micro-structure mixers are used for the rapid mixing. The educts emerge from the micro-structure mixer in the form of thin free jets which mix very rapidly by diffusion and/or turbulence. As a result, the mixing operation is accelerated substantially as compared with conventional reactors. The isocyanate yield is also increased.