Process for the production of dinitrotoluene

US7495136B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Fritz Pohl · Wittmund, DE
• Wolfgang Lorenz · Dormagen, DE
• Juergen Muennig · Kaarst, DE
• Bernd Pennemann · Moitzfeld, DE
• Gerhard Wiechers · Leverkusen, DE

Key dates

• Filing date: Jul 12, 2007
• Grant date: Feb 24, 2009
• Expiry date: Jul 12, 2027

Classification

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

Abstract

Dinitrotoluene is produced by nitration of toluene with nitrating acid (mixture of nitric acid and sulfuric acid) in which, in a first stage, the toluene is converted to mononitrotoluene (MNT) and then the mononitrotoluene is converted in a second stage to dinitrotoluene (DNT). Control of the weight ratio of the aqueous to organic phases, dispersion of the organic phase in the aqueous phase and use of less than 2.06 moles of nitric acid per mole of toluene are key features of this process.