The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 23, 1997
Filed:
May. 08, 1996
Mitsubishi Gas Chemical Company, Tokyo, JP;
Abstract
A process for the production of a pyridinecarboxylic acid by the air-oxidation of an alkylpyridine in a liquid phase, in which the conversion of the alkylpyridine is high, the yield of the pyridinecarboxylic acid is therefore high, the content of impurities in the product is decreased, and unreacted raw material and an oxidation intermediate can be recycled without the adverse effect of accumulation of the catalyst and bromine component, the process comprising oxidizing an alkylpyridine with an oxygen-containing gas in a solvent in the presence of a catalyst formed of a heavy metal salt and a bromine compound, the solvent being a lower aliphatic monocarboxylic acid having a water content of 2 to 15% by weight, or the process comprising the step of catalytically hydrogenating an oxidation reaction mixture or an isolated pyridinecarboxylic acid in the presence of a catalyst of a metal belonging to the group VIII of the periodic table.