Process for the purification of nitrobenzaldenhyde

US4910345A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Willi Streicher · Krefeld, DE
• Heinz U. Blank · Odenthal, DE

Key dates

• Filing date: Aug 12, 1988
• Grant date: Mar 20, 1990
• Expiry date: Aug 12, 2008

Classification

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

Abstract

Crude nitrobenzaldehyde can be substantially purified from the undesired positional isomers if a treatment with 100-10,000% by weight of water and 1-30% by weight of an emulsifier, all with reference to the dry weight of the crude nitrobenzaldehyde, is undertaken at a temperature of 30.degree.-140.degree. C. and at a pH of 3-14.