Continuous preparation of phthalimide

US4419519A · kind A · utility

Assignee

• BASF SE

Inventors

• Gerhard Kilpper · Battenberg, DE
• Johannes Grimmer · Aarhus, DK

Key dates

• Filing date: Jun 29, 1981
• Grant date: Dec 6, 1983
• Expiry date: Jun 29, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D209/48
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the continuous preparation of phthalimide by reacting phthalic anhydride with ammonia in about the stoichiometric ratio, in a mixing apparatus and subsequently in a reaction tube at a particular flow velocity and a particular temperature. The phthalimide obtainable by the process of the invention is a valuable starting material for the preparation of dyes, pesticides and pigments, especially copper phthalocyanines.