Process for the production of isocyanates in the gas phase

US6803482B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Marc Jenne · Recklinghausen, DE
• Heiko Herold · Dormagen, DE
• Martin Friedrich · Harsum, DE
• Herbert Stutz · Karlsruhe, DE

Key dates

• Filing date: May 14, 2003
• Grant date: Oct 12, 2004
• Expiry date: May 14, 2023

Classification

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

Abstract

Isocyanates are produced in the gas phase in a manner such that temperature fluctuations over time and temperature distribution asymmetry are prevented. In this improved process, performance of the reaction in tubular reactors is accomplished by flow-related measures such as homogenization and centering of the educt streams. The formation of polymeric secondary products, which result in baked-on deposits in the reactor and a reduction in reactor service life, is consequently prevented.