Method of preparing p-nitrobenzoic acid

US4007223A · kind A · utility

Assignee

• Dynamit Nobel GmbH · DE

Inventors

• Marcel Feld · Cologne, DE
• Hermann Richtzenhain

Key dates

• Filing date: Dec 23, 1974
• Grant date: Feb 8, 1977
• Expiry date: Dec 23, 1994

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C201/12
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process of preparing a not discolored p-nitrobenzoic acid by oxidation of p-nitrotoluene with oxygen, which comprises contacting the oxygen with the p-nitrotoluene in an acetic acid reaction medium and in the presence of a cobalt-containing and bromine-containing catalyst at a temperature of 80.degree. to 150.degree. C. The cobalt is present as a cobalt salt in the amount of 0.01 to 0.1 moles per mole of p-nitrotoluene, and the amount of acetic acid is 3 to 15 moles per mole p-nitrotoluene.