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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 23, Number 3
BKCSDE 23(3)
March 20, 2002

Title	Precipitation of Manganese in the p-Xylene Oxidation with Oxygen-Enriched Gas in Liquid Phase
Author	Sung Hwa Jhung, Youn-Seok Park
Keywords	Terephthalic acid, p-Xylene oxidation, Oxygen-enriched gas, Manganese precipitation, Blackening.
Abstract	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 Mn⁴⁺. 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 the addition of metal ions, such as cerium, chromium and iron.
Page	369 - 373
Full Text	PDF

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