Process for the continuous separation of slightly volatile components from a crude phthalic acid anhydride

US4430163A · kind A · utility

Assignee

• Davy McKee Aktiengesellschaft · DE

Inventors

• Manfred Albers · Dortmund, DE
• Gerhard Keunecke
• Herbert Krimphove · Pulheim, DE

Key dates

• Filing date: Dec 16, 1981
• Grant date: Feb 7, 1984
• Expiry date: Dec 16, 2001

Classification

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

Abstract

A process is provided for the continuous separation of slightly volatile components from a crude phthalic acid anhydride wherein a portion of the crude phthalic acid anhydride is compressed and heated before being reintroduced into a flash evaporator.