Manufacture of anthraquinones

US4045456A · kind A · utility

Assignee

• BASF SE

Inventors

• Franz Merger · Bischofswerda, DE
• Theodor Jacobsen
• Heinz Eilingsfeld · Bischofswerda, DE
• Ernest Miesen · Ludwigshafen, DE
• Gerhard Nestler · Ludwigshafen, DE

Key dates

• Filing date: Jun 7, 1976
• Grant date: Aug 30, 1977
• Expiry date: Jun 7, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C46/00
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Anthraquinones are manufactured by cyclizing o-benzoylbenzoic acids in the presence of oxygen-containing compounds of aluminum and silicon at elevated temperatures. The products are starting materials for the manufacture of dyes.