Process for the regeneration of catalysts for the gas-phase reduction of aromatic nitro compounds

US4714689A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gunter Stammann · Cologne, DE
• Zoltan Kricsfalussy · Leverkusen, DE
• Helmut Waldmann · Leverkusen, DE
• Joachim Schneider · Ehringshausen, DE
• Harald Medem · Krefeld, DE

Key dates

• Filing date: Aug 7, 1986
• Grant date: Dec 22, 1987
• Expiry date: Aug 7, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/584
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Catalysts for the gas-phase reduction of aromatic nitro compounds to aromatic amines are regenerated by treatment of the catalyst, at elevated temperature, with a gas mixture which contains oxygen, inorganic and/or organic amines and/or nitrogen oxides and, where appropiate, steam.