Continuous isothermal process for preparing mononitrotoluenes in the presence of phosphoric acid

US6768032B2 · kind B2 · utility

Assignee

• Bayer Chemicals AG · DE

Inventors

• Matthias Gotta · Burscheid, DE
• Ralf Demuth · Hilden, DE
• Eberhard Zirngiebl
• Hans-Martin Weber · Leverkusen, DE
• Georg Ronge · Mülheim an der Ruhr, DE

Key dates

• Filing date: Apr 2, 2002
• Grant date: Jul 27, 2004
• Expiry date: Apr 2, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C201/08
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a continuous isothermal process for preparing mononitrotoluenes in the presence of a mixed acid component comprising mixtures of sulfuric acid and phosphoric acid with concentration of the resultant waste acid and recycling of the concentrated waste acid to the process.