Rapid Direct Analysis of p-Xylene Oxidation Products...

Published: Journal of Chromatographic Science, Volume 34, Number 1, January 1996, pp. 27-33

Rapid Direct Analysis of p-Xylene Oxidation Products by Reversed-Phase High-Performance Liquid Chromatography
Antonello Viola and Giacomo Cao

A reversed-phase high-performance liquid chromatographic (HPLC) method is developed for the determination of the products of liquid phase oxidation of p-xyIene to terephthalic acid catalyzed by cobalt naphtenate with methyl benzoate as a solvent. Analyses are performed on a 250- ¥ 4.6-mm octadecylsilica (ODS; C₁₈) bonded phase column with a 10- ¥ 3-mm guard column in 22 min. A three-component mobile phase (methanol, acetonitrile, water) is used for gradient elution, and ultraviolet detection is selectively performed at 220 and 254 nm. The internal standard method (using cumene as the internal standard) is employed. The developed method avoids filtration, extraction, and derivatization pretreatment of the samples.

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