Precipitation of Manganese in the p-Xylene Oxidation with Oxygen-Enriched Gas in Liquid Phase

2002 Bulletin of the Korean Chemical Society (Print)  
The liquid phase oxidation of p-xylene has been carried out with oxygen-enriched gas, and the manganese component was precipitated probably via over-oxidation to Mn 4+ . The precipitation increased with rising oxygen concentration in the reaction gas and occurred mainly in the later part of the oxidation. The activity of the reaction decreased, and the blackening of the product and side reactions to carbon dioxide increased with the degree of precipitation. Precipitation can be decreased with
more » ... e addition of metal ions, such as cerium, chromium and iron.
doi:10.5012/bkcs.2002.23.3.369 fatcat:56bd4uevl5dgphvdewzhbgn2p4