Reprocessing of reaction material discharged from phosgenation reactors

US7592479B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Eckhard Stroefer · Mannheim, DE
• Stephan Scholl · Bad Dürkheim, DE
• Martin Sohn · Mannheim, DE
• Andreas Woelfert · Bad Rappenau, DE
• Hans-Juergen Pallasch · Ludwigshafen, DE
• Jan Peter Bredehoeft · Haßloch, DE

Key dates

• Filing date: Sep 18, 2003
• Grant date: Sep 22, 2009
• Expiry date: Mar 1, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C263/20
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Isocyanates are prepared by reacting primary amines with phosgene in a reactor by a process in which a reaction discharge is present in the form of a suspension which contains the isocyanate to be prepared, as a liquid, and carbamyl chlorides as a solid, and the suspension is worked up in a film evaporator, and this process is carried out in a production plant.