Process for preparing diamines and polyamines from the diphenylmethane series

US7528283B2 · kind B2 · utility

Assignee

• Bayer MeterialScience AG · DE

Inventors

• Fritz Pohl · Wittmund, DE
• Jeffrey Bolton · Mülheim an der Ruhr, DE
• Richard Adamson · Leichlingen, DE
• Heinz Muller · Krefeld, DE
• Rudolf Uchdorf · Shanghai, CN

Key dates

• Filing date: Jan 24, 2007
• Grant date: May 5, 2009
• Expiry date: Apr 28, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C209/78
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention provides an improved process for preparing diamines and polyamines from the diphenylmethane series by reacting aniline and formaldehyde in the presence of an acid catalyst, the improvement involving the aniline containing less than about 3 wt. % of diamines and polyamines from the diphenylmethane series, based on the weight of the aniline.