Abstract
Using a PRP-X300 (150 mm x 4.1 mm I.D.) column, packed with a mediumcapacity cation-exchange resin, short-chain carboxylic acids have been separated in less than 5 min. To describe the selectivity, a mathematical model was used allowing for the calculation of window diagrams. By comparison of the separation characteristics with other columns of the PRP series. the separation mechanism was shown to be controlled by hydrophobic interaction, hydrogen bonding and ion exclusion. PRP-X300 was found to be suitable for a new approach to carboxylic acid separation due to its unique variability in selectivity.
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