Process for the production of phthalimides

US9701632B2 · kind B2 · utility

Assignee

• LANXESS Deutschland GmbH · DE

Inventors

• Wolfgang Zarges · Neunburg vorm Wald, DE
• Georg Martin · Bocholt, DE
• Uwe Boeger · Leverkusen, DE
• Michael Pies · Duisburg, DE
• Guido Issling · Langenfeld, DE
• Markus Koschorreck · Goldkronach, DE

Key dates

• Filing date: Dec 19, 2014
• Grant date: Jul 11, 2017
• Expiry date: Dec 19, 2034

Classification

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

Abstract

The invention relates to a process to produce phthalimides by heating diammonium phthalate in the presence of aromatic solvents and to a process to produce phthalimides by heating diammonium phthalate in the presence of aromatic solvents for their recycled use during the ion exchanger production process. The diammonium phthalate is prepared by making use of the phthalic add salts solution resulted from the on exchanger production process.