Moderate-pressure gas phase phosgenation

US7994361B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Andreas Woelfert · Bad Rappenau, DE
• Christian Mueller · Wiesbaden, DE
• Eckhard Stroefer · Mannheim, DE
• Markus Weber · Langenfeld, DE
• Joachim Pfeffinger · Ludwigshafen, DE
• Carsten Knoesche · Niederkirchen, DE

Key dates

• Filing date: Jul 24, 2003
• Grant date: Aug 9, 2011
• Expiry date: Mar 24, 2028

Classification

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

Abstract

The invention relates to a process for preparing aromatic diisocyanates by reaction of phosgene with diamines in the gas phase, in which the reaction is carried out in a reaction zone at moderate pressures, i.e. the pressure in this reaction zone is more than 3 bar and less than 20 bar.