Method for producing color-stable MDA and MDI

US8614352B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Eckhard Stroefer · Mannheim, DE
• Heiner Schelling · Ludwigshafen, DE
• Robert Reinhardt · Meckenheim, DE
• Michael Zoellinger · Eislingen/Fils, DE
• Daniel Breuninger · Frankenthal (Pfalz), DE
• Markus Kraemer · Radebeul, DE
• Kai Thiele · Ekeren, BE
• Peter Van Den Abeel · Brasschaat, BE

Key dates

• Filing date: Apr 20, 2010
• Grant date: Dec 24, 2013
• Expiry date: Jun 11, 2030

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 methylenediphenyldiamine (MDA) by reacting formaldehyde and aniline in the presence of an acidic catalyst, wherein the oxygen content in the process for preparing MDA is <10 000 ppm, based on all compounds present in the process.The invention further relates to the phosgenation of MDA to methylenediphenyl diisocyanate (MDI).