Method for producing isocyanates

US10435353B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Joachim Zechlin · Neuss, DE
• Tim Loddenkemper · Dormagen, DE
• Friedhelm Steffens · Leverkusen, DE
• Dietmar Wastian · Dormagen, DE

Key dates

• Filing date: Nov 29, 2016
• Grant date: Oct 8, 2019
• Expiry date: Nov 29, 2036

Classification

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

Abstract

The invention relates to the production of isocyanates by means of phosgenation of the corresponding primary amines in the gas phase, wherein the reactant flows of amine and phosgene are fed separately to a reactor through a pre-heated inert gas flow. Isocyanates within the sense of the invention are, in the broadest sense, all isocyanates whose corresponding amines can be substantially converted into the gas phase without decomposing, with the exception of 1,5-pentane diisocyanate.