Isolation of dinitroanthraquinone having a high content of .alpha.,.alpha.- d

US4042604A · kind A · utility

Assignee

• BASF SE

Inventors

• Heinz Eilingsfeld · Bischofswerda, DE
• Dietrich Lach

Key dates

• Filing date: May 14, 1976
• Grant date: Aug 16, 1977
• Expiry date: May 14, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C225/34
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the isolation of mixtures of 1,5-dinitroanthraquinone and 1,8-dinitroanthraquinone which have a high content of .alpha.,.alpha.'-dinitroanthraquinones by heating a suspension of the crude dinitroanthraquinone mixture in certain organic liquids at from 60.degree. to 200.degree. C until solution equilibrium has been set up, and separating the undissolved material from the solution. The undissolved material contains more than 90% and as a rule more than 95% by weight of 1,5-dinitroanthraquinone and 1,8-dinitroanthraquinone. The pure mixture of 1,5-dinitroanthraquinone and 1,8-dinitroanthraquinone may be used for the manufacture of dyes.