Process for the isolation of pure dinitrotoluenes

US5149890A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gunther Rauchschwalbe · Leverkusen, DE
• Heinz U. Blank · Odenthal, DE
• Ludwig Deibele · Neunburg vorm Wald, DE
• Kaspar Hallenberger · Leverkusen, DE
• Gerhard Ruffert · Leverkusen, DE

Key dates

• Filing date: Nov 1, 1991
• Grant date: Sep 22, 1992
• Expiry date: Nov 1, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C201/16
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Pure or substantially enriched 2,4- and 2,6-dinitrotoluene can be isolated from a mixture containing these isomers if such a mixture is distilled under a pressure of 0.5 to 20 mbar at a temperature of 80.degree. to 200.degree. C. with exclusion of reducing conditions.