Liquid phase air oxidation process for making phthalic acids

US4162365A · kind A · utility

Assignee

• Chemische Werke Huels Aktiengesellschaft · US

Inventors

• Ferdinand List · Marl, DE
• Helmut Alfs · Marl, DE

Key dates

• Filing date: Jul 13, 1976
• Grant date: Jul 24, 1979
• Expiry date: Jul 13, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/265
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

An improvement in the liquid phase air oxidation process based upon a solvent system such as acetic acid and with a bromine activated heavy-metal catalyst system for preparing phthalic, isophthalic and terephthalic acids from their corresponding alkyl benzenes wherein the heavy metal is a soluble cobalt compound and sufficient excess of air is introduced so that the waste gas still contains an excess of oxygen.