Process for preparing isocyanates in the gas phase

US7754915B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Heiko Herold · Dormagen, DE
• Volker Michele · Cologne, DE
• Werner Konig · Leverkusen, DE

Key dates

• Filing date: Oct 20, 2004
• Grant date: Jul 13, 2010
• Expiry date: Apr 16, 2026

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C263/10
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing isocyanates in the gas phase, in which the mixing of the reactants and thus the reaction conditions are significantly improved by means of hydrodynamic measures such as increasing the turbulence of the feed stream in the central nozzle. As a consequence, the necessary residence time in the reactor and thus the length of the reactor are reduced and the formation of polymeric by-products which lead to caking in the reactor and a shortening of the operating period of the reactors is avoided.