Method for the production of amines

US7091383B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Dominic Vanoppen · Kapellen, BE
• Ekkehard Schwab · Neustadt, DE
• Frederick van Laar · Schifferstadt, DE
• Hartwig Voss · Bischofswerda, DE
• Steffen Oehlenschlaeger · Ludwigshafen, DE
• Wolfgang Mackenroth · Bad Dürkheim, DE
• Konrad Morgenschweis · Dresden, DE
• Ulrich Penzel · Lauscha, DE
• Bernd Weidner · Wormlage, DE

Key dates

• Filing date: Jan 30, 2003
• Grant date: Aug 15, 2006
• Expiry date: Aug 15, 2023

Classification

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

Abstract

The invention provides a process for preparing amines by catalytic hydrogenation of nitroaromatics and subsequent removal of the catalysts from the reaction mixture, which contains at least one aromatic amine and water, which comprises carrying out the removal of the catalysts by means of membrane filtration, which is carried out at a pressure on the suspension side of from 5 to 50 bar, a pressure difference between the suspension side and the permeate side of at least 0.3 bar and a flux rate on the suspension side of from 1 to 6 m/s.