Method for starting a reaction during the production of aromatic amines from nitroaromatics

US9290438B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Michael Merkel · Hof, DE
• Thomas Knauf · Dormagen, DE
• Cliff Andre Peters · Marne, DE
• Thorsten Schmidt · Horgen, CH

Key dates

• Filing date: Apr 12, 2013
• Grant date: Mar 22, 2016
• Expiry date: Apr 17, 2033

Classification

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

Abstract

The present invention relates to a method of producing aromatic amines by hydrogenation of aromatic nitro compounds. This method provides a reactor containing a hydrogenation catalyst; supplies aromatic nitro compounds and hydrogen to the reactor and contacts them with a hydrogenation catalyst, in which the hydrogen which is supplied to the reactor is by a compressor and the compressor contains an operating fluid which at least partially contacts the hydrogen; and regenerates the hydrogenation catalyst by heating and contacting it with oxygen. Particular operating liquids are subsequently exchanged.