Process for separating off aminobiphenyl from diphenylamine

US5602284A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Frank Arndt · Krefeld, DE
• Hans-Josef Buysch · Krefeld, DE
• Rudolf Wiemers · Meerbusch, DE

Key dates

• Filing date: Sep 11, 1995
• Grant date: Feb 11, 1997
• Expiry date: Sep 11, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C209/86
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Aminobiphenyl (ABP) can be separated off from diphenylamine (DPA) by treating the DPA to be purified at elevated temperature with a substance in which oxygen is bonded by a double bond to a C atom, an N atom or another O atom and then separating off the DPA from the treated mixture.