Process for the preparation of pure 1-nitroanthraquinone

US3931252A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Wolfgang Auge
• Bernd Thelen · Leverkusen, DE
• Karl-Werner Thiem · Charleston, US
• Rutger Neeff

Key dates

• Filing date: Nov 16, 1973
• Grant date: Jan 6, 1976
• Expiry date: Nov 16, 1993

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C205/47
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for the manufacture of pure 1-nitroanthraquinone, characterised in that a nitroanthraquinone mixture obtained by nitration of anthraquinone in the presence of inorganic acids and, optionally, lowering the molar fraction of the acids in the reaction mixture after isolation of the reaction products which have precipitated and, optionally, further measures, is subjected to a rectification.