Method for the continuous production of isocyanates

US7851648B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Martin Sohn · Mannheim, DE
• Eckhard Stroefer · Mannheim, DE
• Filip Nevejans · Sint-Niklaas, BE
• Ulrich Penzel · Lauscha, DE
• Hans-Juergen Pallasch · Ludwigshafen, DE
• Rene Leuthold · Hohenbocka, DE
• Andreas Brodhagen · Schifferstadt, DE
• Andreas Woelfert · Bad Rappenau, DE
• Wolfgang Mackenroth · Bad Dürkheim, DE
• Markus Maurer · Gettorf, DE

Key dates

• Filing date: Dec 13, 2003
• Grant date: Dec 14, 2010
• Expiry date: Mar 9, 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 polyisocyanates by reacting organic amines with phosgene, wherein the reaction is carried out in at least three stages, with the first stage being carried out in a mixing apparatus, the second stage in at least one residence apparatus and the third stage in at least one separation apparatus and the pressure in each successive stage being lower than that in the previous stage.