Obtaining maleic anhydride not prone to discolor

US4921977A · kind A · utility

Assignee

• BASF SE

Inventors

• Gerhard Michl · Ludwigshafen, DE
• Rolf Seubert · Bischofswerda, DE
• Johannes E. Schmidt · Ludwigshafen, DE

Key dates

• Filing date: Jan 4, 1989
• Grant date: May 1, 1990
• Expiry date: Jan 4, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/573
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for obtaining maleic anhydride that is not prone to discolor by treating crude maleic anhydride with oxygen, a gas mixture containing oxygen, or a substance that releases oxygen before or while it is distilled.