Patent Number: 8,716,517

Title: Method for producing diisocyanates by gas-phase phosgenation

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.

Inventors: Mattke; Torsten (Freinsheim, DE), Olbert; Gerhard (Dossenheim, DE), Knoesche; Carsten (Niederkirchen, DE), Schelling; Heiner (Kirchheim, DE)

Assignee: BASF SE

International Classification: C07C 263/10 (20060101)

Expiration Date: 5/06/12018