Method for producing diisocyanates by gas-phase phosgenation

US8716517B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Torsten Mattke · Ludwigshafen am Rhein, DE
• Gerhard Olbert · Dossenheim, DE
• Carsten Knoesche · Niederkirchen, DE
• Heiner Schelling · Ludwigshafen, DE

Key dates

• Filing date: Aug 10, 2010
• Grant date: May 6, 2014
• Expiry date: Oct 31, 2030

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/129
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing diisocyanates by gas-phase phosgenation starting out from a feed stream comprising the corresponding diamines and a phosgene-comprising feed stream, in which the feed streams are separately converted into the gas phase and preheated to the reaction temperature of the gas-phase phosgenation, wherein the waste heat from a plant for preparing chlorine by heterogeneously catalyzed oxidation of hydrogen chloride by the Deacon process is utilized for this purpose, is proposed.