Process for the production of dinitrotoluene

US6258986A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Uwe Klingler · Dormagen, DE
• Thomas Schieb · Rösrath, DE
• Dietmar Wastian · Dormagen, DE
• Gerhard Wiechers · Leverkusen, DE
• Jurgen Zimmerman · Walnut Creek, US

Key dates

• Filing date: Aug 3, 1995
• Grant date: Jul 10, 2001
• Expiry date: Aug 3, 2015

Classification

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

Abstract

Dinitrotoluene is produced by nitrating toluene with nitrating acid under adiabatic conditions in a manner such that some mononitrotoluene is present in reaction mixture. The nitration reaction mixture is then treated to remove at least 5% by weight of water before the reaction mixture is separated into an acid phase and an organic phase. The product dinitrotoluene is recovered from the organic phase. The acid phase may be recycled after nitric acid has been added to replace that which was used in the nitration reaction.