Separation of Aromatic Carboxylic Acids Using Quaternary Ammonium Salts on Reversed‐Phase HPLC. 2. Application for the Analysis of Loy Yang Coal Oxidation Products

Abstract

In order to develop separation processes and analytical methods for aromatic carboxylic acids for the coal oxidation products, the separation behavior of aromatic carboxylic acids on a reversed‐phase HPLC using eluent containing quaternary ammonium salt was optimized using the solvent gradient method. This method was applied for the analysis of Loy Yang coal oxidation products. It was confirmed that the analytical data using this method were consistent with those determined using gas chromatography.

Keywords:

• High performance liquid chromatography
• aromatic carboxylic acid
• coal oxidation products
• alkaline solution at high temperature
• quaternary ammonium salt
• ion‐pair solvent extraction

Acknowledgement

This research was supported by a Grant‐in‐Aid from the Ministry of Education, Culture, Sports, Science and Technology, Japan. The authors greatly appreciate Dr. D. Rash and Professor W. R. Jackson of Monash University for the coal oxidation experiment.