Separation of Aromatic Carboxylic Acids Using Quaternary Ammonium Salts on Reversed‐Phase HPLC. 1. Separation Behavior of Aromatic Carboxylic Acids
| Autor: | Kunio Kawamura, G. J. Perry, T. V. Verheyen, Akitsugu Okuwaki |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
chemistry.chemical_classification
Process Chemistry and Technology General Chemical Engineering Carboxylic acid Salt (chemistry) Filtration and Separation General Chemistry High-performance liquid chromatography Capacity factor chemistry.chemical_compound chemistry Organic chemistry Ammonium Benzene Naphthalene Benzoic acid |
| Zdroj: | Separation Science and Technology. 41:379-390 |
| ISSN: | 1520-5754 0149-6395 |
| DOI: | 10.1080/01496390500496900 |
| Popis: | 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 has been investigated. The retention mechanism of aromatic carboxylic acids was discussed on the basis of both ion-pair partition model and ion-exchange model. The retention behavior of aromatic carboxylic acids possessing one (or two) carboxylic acid group(s) followed the ion-pair partition model, where linear free energy relationship was observed between the capacity factor and the extraction equilibrium constants of benzoic acid and naphthalene carboxylic acid. Besides, the retention behavior followed ion-exchange model with increasing the number of carboxylic acids, where the capacity factor of benzene polycarboxylic acids is proportional to the association constants between aromatic acids and quaternary ammonium ions calculated on the basis of an electrostatic interaction model. |
| Databáze: | OpenAIRE |
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