Process for quenching a gaseous reaction mixture during the gas phase phosgenation of diamines

US6800781B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Heiko Herold · Dormagen, DE
• Herbert Stutz · Karlsruhe, DE
• Hans-Joachim Brockhaus · Leverkusen, DE
• Volker Michele · Cologne, DE

Key dates

• Filing date: Sep 25, 2003
• Grant date: Oct 5, 2004
• Expiry date: Sep 25, 2023

Classification

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

Abstract

The present invention provides a process for quenching a gaseous reaction mixture during the phosgenation of diamines in the gas phase to produce diisocyanates. The gaseous reaction mixture contains at least a diisocyanate, phosgene and hydrogen chloride. The quenching liquid is injected into the gas mixture continuously flowing out of a cylindrical reaction zone into the downstream cylindrical quenching zone with the aid of at least two spray nozzles which are arranged at the entrance to the quenching zone at equal distances along the circumference of the quenching zone.